Abstract: A powder-metallurgical body and a method for producing such a body. The powder-metallurgical body is formed with a seating base for seating a sealing element to produce a seal with respect to fluids, such as liquids and/or gases. The body is redensified in a low region of the seating base.

Abstract: The composition includes the iron as the main particulate metallic material; at least one particulate alloy element, with the function of hardening the ferrous structural matrix; and a precursor non-metallic particulate compound, generally a carbide or a carbonate, which is capable of generating, upon its dissociation during the sintering, graphite nodules, whose formation is facilitated: by the precursor compound itself when it includes a chemical element which stabilizes the iron alpha phase of the ferrous structural matrix; or by an additional alloy element included in the composition and which is defined by a chemical element that stabilizes the iron alpha phase during the sintering. The composition can be conformed by compaction or by powder injection molding. The process of the invention leads to obtaining products in self-lubricating sintered steel from said composition.

Abstract: The present invention relates to a method for forming golf club head using metal injection molding and the resulting golf club head. The method of the invention allows for a lower volume of powdered metal than current metal injection molding processes thereby decreasing overall production cost.

Abstract: A method of producing three-dimensional bodies which wholly or for selected parts consist of amorphous metal. A metal powder layer (4) is applied to a heat-conducting base (1, 13), and a limited area of the layer is melted by a radiation gun (5) and the area is cooled so that the melted area solidifies into amorphous metal. The melting process is successively repeated on new limited areas of the powder layer until a continuous layer of amorphous metal is formed. A new powder layer is applied and the method is repeated, the new layer being fused to underlying amorphous metal for successive construction of the three-dimensional body. The heat-conducting base can be a worktable or a body of amorphous metal or crystalline metal to which amorphous metal is added.

Abstract: The method relates to a method for producing a strand-like, particularly band-like semi-finished part for electrical contacts, wherein the semi-finished part has a top side intended for making the electrical contact, said top side made from a silver-based composite material in which one or multiple metal oxides or carbon are embedded, and has a carrier layer supporting the composite material made of easily solderable or weldable ignoble metal, and method having the following steps: Powder-metallurgic production of a block made from the silver-based composite material, encasing of the block made of the composite material with a powder made from the easily solderable or weldable ignoble metal, compressing the block, encased by the metal powder, to condense the metal powder, sintering the compressed block in a reducing atmosphere or in an inert atmosphere or in a vacuum, avoiding the formation of fluid eutectics from the silver of the composite material and from the non-precious metal with which the block made f

Abstract: Provided is an easy and inexpensive method for producing a sintered rare-earth magnet having cavities, such as slits, for making the magnet less likely to be influenced from eddy currents and/or performing a grain boundary diffusion process. The method for producing a sintered rare-earth magnet includes performing the following successive processes: a filling process ((a), (b)) for filling a powder of rare-earth magnet alloy into a powder-filling container together with a cavity-forming member; an aligning process (b) for aligning the rare-earth magnet alloy powder in a magnetic field; and a sintering process (e) for sintering the rare-earth magnet alloy powder by heating the rare-earth magnet alloy powder in a state of being held in the powder-filling container, wherein (d) the cavity-forming member is removed after the aligning process is completed and before the rare-earth magnet alloy powder begins to be sintered.

Abstract: A wear resistant steel material, produced in a powder metallurgical manner, has the following composition in weight-%: and, further, 0.5 to 14 of (V+Nb/2), wherein the contents of N, on one hand, and of (V+Nb/2), on the other hand, are balanced in relation to each other so that the contents of said elements are within a range A, B, G, H, A in a perpendicular plane coordinate system, where the content of N is the abscissa and the content of V+Nb/2 is the ordinate, and where the coordinates for said points are: and max 7 of any of Ti, Zr, and Al; balance essentially only iron and unavoidable impurities. This steel is excellent for obtaining a wear resistant surface region on a substrate of a metallic material by hot isostatic pressing of the steel material of the substrate. Especially when the wear resistant steel is void of Co, the compound body obtained is especially suitable for use in e.g. valves for nuclear power plants.

Abstract: Disclosed are a sintered composite machine part as a cylinder block for piston pumps or piston motors, and a manufacturing method thereof. The machine part has an air-tight main body of sintered porous iron alloy and having an iron oxide layer on the surface; and a sliding part of sintered porous copper alloy being bonded direct to the main body. The sliding part is to be slid in tight contact with a fluid supply/return device. The manufacturing is made by preparing a main body of sintered porous iron alloy and a green compact for sliding part from a raw material metal powder having a composition corresponding to the copper alloy; sintering the green compact for sliding part in contact with the main body to bond the sliding part to the main body by diffused junction; and subjecting the main body to steam treatment to provide an iron oxide layer.

Abstract: The present invention relates to a method for forming golf club head using metal injection molding and the resulting golf club head. The method of the invention allows for a lower volume of powdered metal than current metal injection molding processes thereby decreasing overall production cost.

Abstract: A method of compacting material such as but not limited to cathode material for electrochemical cells. A mixture is inserted into a die cavity and the mixture is compacted into a disk shape by the action of a first plunger pressing down on the material and a second plunger pressing upwardly on the material. Flashing of material during ejection of the disk from the die is prevented by fitting a polymeric sleeve around the outer surface of the first plunger. The sleeve flexes to bulge outwardly and does not enter the die cavity during compaction of material and returns to its original position during ejection of the compacted disk from the die. Contact between the disk and sleeve prevents flashing during ejection. Alternatively, a polymeric seal ring is placed around the outer surface of the first plunger. The disk presses against the seal ring preventing flashing of material during ejection.

Abstract: In a process for manufacturing composite sintered machine components, the composite sintered machine component has an approximately cylindrical inner member and an approximately disk-shaped outer member, the inner member has pillars arranged in a circumferential direction at equal intervals and a center shaft hole surrounded by the pillars, and the outer member has holes corresponding to the pillars of the inner member and a center shaft hole corresponding to the center shaft hole of the inner member and connected to the holes. The process comprises compacting the inner member and the outer member individually using an iron-based alloy powder or an iron-based mixed powder so as to obtain compacts of the inner member and the outer member, tightly fitting the pillars of the inner member into the holes of the outer member, and sintering the inner member and the outer member while maintaining the above condition so as to bond them together.

Abstract: A method of forming a crankshaft bushing or similar component is provided. A compaction die is provided having an axial, generally cylindrical internal opening. An upper and a lower punch are provided with exterior surfaces corresponding to the internal opening of the compaction die. An upper core rod passes through an axial opening in the upper punch. A lower core rod passes through an axial opening in the lower punch. The upper core rod and the lower core rod each may have a generally flat external surface section. A metal powder is compacted in the compaction die by the combined action of the upper and lower punches and the upper and lower core rods.

Abstract: This invention relates to a percussion drill bit head for a percussion drilling apparatus, the drill bit head comprising a working surface and a plurality of super-hard buttons protruding from the working surface, the working surface having a hard area that is free of buttons and has Rockwell C hardness of at least 60 HRc. The invention further relates to a method of manufacturing a percussion drill bit head comprising a working surface and a plurality of buttons and a percussion drill bit assembly comprising a drill bit head according to the invention.

Abstract: Certain embodiments provide a composite magnetic material for an inductor, wherein a non-magnetic material contains a first binder as a compacting additive, and is added to and mixed with the soft magnetic metal powder, and a second binder that is impregnated to a compact as a binder after the heat treatment of the compact obtained by adding the first binder to the soft magnetic metal powder and compacting it, and the soft magnetic metal powder contains 40% by mass or more (including 100%) of spherical particles of which the ratio L2/L1 between a perimeter L1 of a particle cross-section in the two dimensional plane view and a perimeter L2 of a circle having equivalent cross-sectional area is 0.5 or more.

Abstract: The invention relates to a method for manufacturing a dental scaler tip using a powder injection molding process, a mould, and a scaler tip that is excellent in shape-reliability and injects fluid to a front end thereof along a curved section of the tip. The method comprises the steps of preparing feedstock and injecting the feed stock into a mould to form a molding body, wherein, the mould comprises an operating section to which cylindrical core pins having multi steps and an eccentric end formed at a front end thereof for forming the fluid passage is mounted; and a pair of slide cores disposed for supporting the eccentric ends of the core pins such that the slide cores face each other and are slid in the direction perpendicular to the movement direction of the core pins to form a cavity corresponding to a shape of an article to be formed.

Abstract: The present invention provides a method of manufacturing Ni-doped TiO2 nanotube-shaped powder and a method of manufacturing a sheet film to be inserted into a high-pressure hydrogen tank for a fuel cell vehicle by mixing the Ni-doped TiO2 nanotube-shaped powder with a binder and compressing the mixture. The method of manufacturing Ni-doped TiO2 nanotube-shaped powder includes: forming Ni-doped TiO2 nanotube-shaped powder using Ni-doped TiO2 powder as a starting material; and drying the Ni-doped TiO2 nanotube-shaped powder in the temperature range of 60 to 200° C. for 2 to 24 hours.

Abstract: A method of compacting material such as but not limited to cathode material for electrochemical cells. A mixture is inserted into a die cavity and the mixture is compacted into a disk shape by the action of a first plunger pressing down on the material and a second plunger pressing upwardly on the material. Flashing of material during ejection of the disk from the die is prevented by fitting a polymeric sleeve around the outer surface of the first plunger. The sleeve flexes to bulge outwardly and does not enter the die cavity during compaction of material and returns to its original position during ejection of the compacted disk from the die. Contact between the disk and sleeve prevents flashing during ejection. Alternatively, a polymeric seal ring is placed around the outer surface of the first plunger. The disk presses against the seal ring preventing flashing of material during ejection.

Abstract: An implantable medical lead for mechanical and electrical connection to an implantable medical device. The lead has a ring electrode in connection with its distal end. This ring electrode a coil adapter made of a first conducted material mechanically and electrically connected, directly or indirectly, by spark plasma sintering to an electrode member made of a second conducting material.

Abstract: Systems and methods produce forged powder metal parts respectively comprising a transverse feature. A system may comprise a powder metal die, a sintering oven, a forging apparatus, a core material, and a powder metal. The powder metal die may receive and compact the core material and the powder metal to form a compacted powder metal part with at least a portion of the core material embedded therein to define a transverse feature in the compacted powder metal part. The sintering oven may receive and sinter the compacted powder metal part with the core material remaining embedded therein to maintain the definition of the transverse feature during sintering. The forging apparatus may receive and forge the sintered powder metal part with the core material remaining embedded therein to maintain the definition of the transverse feature during forging with the embedded core material being removable from the forged powder metal thereafter.

Abstract: An apparatus and process for forming compacted powder metal parts having a non-axial undercut feature. An undercut die is located between the upper and the lower dies and contains a plurality of shaped punches aligned in a circular pattern. Each of the shaped punches contains a working edge. The working edges converge to form an inner circumference which creates the undercut feature. The edges of the shaped punches slide with respect to each other to change the size of the inner circumference from a maximum diameter position to a minimum diameter position. During compaction, the rotation of the shaped punches alters the inner circumference to its minimum diameter position thereby forming an undercut in the final compacted part. The retraction of the shaped punches to its maximum diameter position enables the unimpeded removal of the part from the tool set.

Abstract: The invention is related to a method for protecting a metal surface subject to erosion temperatures up to 850° C. The method comprises providing the metal surface with a cermet composition represented by the formula (PQ)(RS) comprising: a ceramic phase (PQ) and binder phase (RS) wherein, P is at least one metal selected from the group consisting of Group IV, Group V, and Group VI elements, Q is boride, R is selected from the group consisting of Fe, Ni, Co, Mn and mixtures thereof, S comprises Ti and at least one element selected from the group consisting of Cr, Al, Si and Y.

Abstract: The invention concerns a method of producing various massive blanks of encapsulated pipe connections by pressure moulding metal powder material, such as an encapsulated manifold (1) on a base plate (2). In an open mould of steel plates are installed a planned network of both curved and straight pipes (4) both for fluids, via a series of control valves (3) to a control module for hydraulic couplings, and for through pipes (5) for couplings for hydraulic and electrical distribution. From holes in the mould walls pipe ends are extending, which are sealed to the holes in the mould plates. External plates entered on to pipe connectors and locked before the HIP process hold the geometry of the piping network. When the network of pipe and cable connections is established, the top plate is sealed to the mould.

Abstract: A matrix drill bit and method of manufacturing a matrix bit body from a composite of matrix materials is disclosed. Two or more different types of matrix materials may be used to form a composite matrix bit body. A first matrix material may be selected to provide optimum fracture resistance (toughness) and optimum erosion, abrasion and wear resistance for portions of a matrix bit body such as cutter sockets, cutting structures, blades, junk slots and other portions of the bit body associated with engaging and removing formation materials. A second matrix material may be selected to provide desired infiltration of hot, liquid binder material with the first matrix material to form a solid, coherent, composite matrix bit body.

Abstract: Hollow metal and/or metal alloy articles are fabricated by the reduction of metal containing compounds, particularly non-metallic metal compounds.

Abstract: A method for producing a three-dimensional shaped article, including molding by irradiation of an optical beam to powder and by a rotating tool, providing a hollow part in a base pedestal supporting a shaped object, filling the hollow part filled with powder, forming a powder layer in the upper part of the hollow part and a surrounding region thereof, after a sintering region supporting the shaped object from the underside is formed in a region containing the powder layer, molding three or more supports of the base pedestal and two or more support frames connecting the shaped object, then the molded product and the base pedestal are then reversed in a vertical direction, thereby cutting and removing the sintering region, and molding the bottom part to achieve the object based on the fact that the supporting frames and the shaped object are cut and separated.

Abstract: An infiltration method of forming an article including providing a working mold including a solid binder member extending through an interior of the working mold, wherein the solid binder member is made of a binder material, and providing a layer of powder matrix material within a molding void of the working mold. The method further includes heating the working mold to form a molten binder pathway from the solid binder member to infiltrate the layer of powder matrix material.

Abstract: In order to create titanium components with a titanium composite insert, a method is provided whereby an initial pre form 1 has a groove 2 formed in it. An encapsulating member 4 is then provided about the groove 2 in order to create a cavity 5 which is filled with titanium alloy powder 6. This titanium alloy powder 6 is densified and then accurately machined in order to create a groove insert form 7 which can accommodate a titanium composite material pre form insert 8 and further titanium alloy powder 9 such that through a high temperature isostatic pressing (HIP) process, the insert 8 is embedded. The original component form 1 can then be machined in order to create the final component elements such as aerofoils 13.

Abstract: In a method of manufacturing a pressed scandate dispenser cathode, firstly, scandium nitrate, barium nitrate, calcium nitrate, aluminum nitrate and ammonium metatungstate (AMT) are dissolved in de-ionized water, respectively, and then mixed with a solution of a cross-link agent such as citric acid and H2O2. After water bathing, the mixed aqueous solution turns into gel, and the powders are obtained after the gel calcination. Secondly, the calcined powders are reduced by hydrogen. Finally, the reduced powders are pressed into shapes and then sintered in the furnace with the atmosphere of hydrogen or by Spark Plasma Sintering (SPS 3.202-MK-V) in vacuum.

Abstract: A method of forming a hollow part from a mixture is disclosed. The method may include rotationally molding the mixture into a green part. Additionally, the method may include debinding the green part into a brown part. The method may also include sintering the brown part into the hollow part.

Abstract: The invention relates to a method and to a device for producing a 3D object by means of a generative 3D-method, for example, selective laser sintering (SLS) and selective laser melting (SLM). An infrared sensor can be cross-flown by a tempered fluid in order to prevent said infrared sensor (6), which is provided in the process chamber (1) of the device, from being impaired by monomer deposits, oligomers or solid material particles during the construction thereof.

Abstract: A wire/fiber ring having two layers applied in four clock positions. Each layer includes a first material strand having a first diameter and a second material strand having a second diameter different from the first diameter. A second or any subsequent layer is disposed such that there is unambiguous nesting between strands in adjacent layers. After the array is built-up, wire is over-wrapped around the array to hold it in place during subsequent consolidation steps, which take place after the built-up array is sealed in an air-tight container and evacuated. After heating and application of pressure a wire/fiber array having a void content of about 12% and a fiber content of between about 0% to 70% and preferably between about 30% and 45% can be achieved.

Abstract: The present invention relates to a process for hardening an aluminum-based matrix alloy by the dispersion of metallized graphite (MG) with copper and optionally zinc or boron by the agitation in liquid state. By this means, the impregnating of MG particles (reinforcing phase) is increased, facilitating the homogenous distribution in the aluminum-base matrix alloy. The mechanical properties of aluminum or aluminum-based are increased alloys by the process of hardening by dispersion, without affecting the density and electrical conductivity of the alloy.

Abstract: A powder metal component which has a powder metal composition formed into a cylinder, wherein the cylinder includes a wall thickness and a length, and a ratio of the length to the thickness is relatively high such that conventional compaction methods are difficult to use. The powder metal composition includes approximately between 85% and 99% sponge iron powder, approximately between 0.1% and 2.0% graphite, and approximately between 0.1% and 2.0% ethylene bis-stearamide wax. The powder metal component can be manufactured using an apparatus which includes a hard material core rod, and a shaped elastic die configured to circumscribe the core rod, or conversely, an apparatus with a shaped elastic core rod and a hard die.

Abstract: The invention provides for a cermet powder containing 75-90% by weight of at least one hard material powder, from 10 to 25% by weight of one or more matrix metal powders and up to 3% by weight of at least one modifier, wherein the matrix metal powder or powders contain from 0 to 38% by weight of cobalt, from 0 to 38% by weight of nickel, from 0 to 20% by weight of aluminum, from 0 to 90% by weight of iron and from 10 to 35% by weight of chromium and the sum of the contents of iron and chromium is in the range from 10 to 95% by weight and the sum of the contents of cobalt, nickel and iron is in the range from 65 to 95% by weight. The invention also relates to a cermet and a process to make the cermet containing the cermet powder and shaped article coated with the cermet powder and a process to make the shaped article.

Abstract: A method of manufacturing a three-dimensionally shaped object by irradiating a metallic material with light beams, wherein the metallic material is supplied at a high density to increase the density and the strength of the three-dimensionally shaped object. The method of manufacturing a three-dimensionally shaped object comprises: an irradiation step of irradiating a metal mesh (2) formed of metal wires and a powder layer (3) formed of metal powder with light beams (L) to form a solidified layer or molten layer; and a laminating step of repeatedly performing the irradiation step for metal meshes to form a three-dimensionally shaped object. In the method, both of the metal mesh (2) and the metal powder are supplied in combination as the metallic material.

Abstract: One embodiment of the invention includes first particles comprising an intermetallic compound comprising titanium and aluminum; second particles comprising aluminum; and third particles comprising titanium.

Abstract: Polycrystalline diamond (PCD) carbide composites of this invention have a microstructure comprising a plurality of granules formed from PCD, polycrystalline cubic boron nitride, or mixture thereof, that are distributed within a substantially continuous second matrix region that substantially surrounds the granules and that is formed from a cermet material. In an example embodiment, the granules are polycrystalline diamond and the cermet material is cemented tungsten carbide. PCD carbide composites of this invention display improved properties of fracture toughness and chipping resistance, without substantially compromising wear resistance, when compared to conventional pure PCD materials.

Abstract: A method for manufacturing a turbine damper by a metal injection molding process is disclosed. The damper includes a base section and a wire section, and is formed of a nickel-base or cobalt base superalloy.

Abstract: The invention describes a component unit comprising at least one component (3), in particular a molded component (4), made from a powder or powder mixture containing metallic and optionally non-metallic components produced by compressing this powder or powder mixture, followed by sintering. At least one surface portion (12) of the component (3) which co-operates with another surface portion (13) of another component (14, 22) when pressure force acting between the two surface portions (12, 13) is applied is coated with an anti-friction varnish (2). The invention further relates to a method of producing such a component (3, 14, 22) with the anti-friction varnish (2).

Abstract: A powder feeding apparatus of manufacturing a heat pipe includes a vibration tray having a supporting board and a plurality of pipes positioned in the supporting board of the tray. A mandrel is coaxially inserted in each of the pipes. A feeder is located corresponding to an end of each pipe for feeding powder into the pipe. A vibration source drive the tray to vibrate along a direction perpendicular to an axial direction of each of the pipes when feeding the powder into the pipes from the feeders, whereby the pipes vibrate with substantially the same amplitude in the vibration direction.

Abstract: A method for fabricating a unitary distributor is disclosed, the method comprising the steps of determining three-dimensional information of the unitary distributor having at least one flow passage having an arcuate portion located within a distributor ring body having an axis, converting the three-dimensional information into a plurality of slices that each define a cross-sectional layer of the unitary distributor and successively forming each layer of the unitary distributor by fusing a metallic powder using laser energy. A distributor is disclosed comprising a flow passage with an arcuate portion located in a distributor ring body wherein the distributor is made by using a rapid manufacturing process. A unitary fuel distributor comprising a fuel conduit and a distributor is disclosed wherein the unitary fuel distributor is made by using a rapid manufacturing process.

Abstract: Method for manufacturing complex shape parts including parts with cavities from powder materials by Hot Isostatic Pressing (HIP) with controlled pressure inside the HIP tooling and multi-layer inserts including hollow inserts. Controlled pressure inside the HIP tooling is provided by injecting the HIP gas media into the cavities of the hollow inserts.

Abstract: A method and process for at least partially forming a medical device that is at least partially formed of a novel metal alloy which improves the physical properties of the medical device.

Abstract: The method is suitable for the manufacture of flat or shaped titanium aluminide articles and layered metal matrix composites such as lightweight plates and sheets for aircraft and automotive applications, thin cross-section vanes and blades, composite electrodes, heat-sinking lightweight electronic substrates, bulletproof structures for vests, partition walls and doors, as well as for sporting goods such as helmets, golf clubs, sole plates, crown plates, etc.

Abstract: A flow control element comprises a cylindrical element body having a bore formed therethrough. The cylindrical element body may include inner and outer peripheral surfaces and define a plurality of tortuous flow passages which extend between the inner and outer peripheral surfaces. The flow control element is formed as a unitary structure wherein the flow passages are oriented along at least two axes. The flow control may be formed by direct to metal laser sintering wherein successive layers of powdered metallic material are solidified by applying laser energy to the selected portions until the flow element is formed as a unitary structure with a plurality of flow passages extending therethrough. The laser energy is selectively applied to the powdered metallic material according to a computer model of the flow control element.

Abstract: A metal particle having an organic substance coated thereon, dispersibility that is the same as that of a known metal particle having an organic substance coated thereon, and an improved low temperature connectability. A method for forming interconnect between materials by using the interconnect materials that include a metal particle on which an organic substance is coated, which includes the steps of coating the interconnect materials on subject interconnect materials, and heating the materials at a temperature in the range of 50 to 400° C. for 1 sec to 10 min to form a sintered body made of metal between the subject interconnect materials. The organic substance is a secondary amine having a molecular weight of 250 or less, and the metal particle is made of a unit of silver, copper, or gold, which has a mean diameter of 100 nm or less, or a mixture thereof.

Abstract: A powder feeding apparatus and a method of manufacturing a heat pipe are disclosed. The method includes: a) proving the powder feeding apparatus including a vibrating tray and a pump (800); b) positioning a tube in the vibrating tray; c) inserting a mandrel (400) into the tube from a first open end of the tube, wherein at least one groove (410) is defined in an end of the mandrel corresponding to a second open end of the tube; d) positioning a feeder (300) on the first end of the tube; e) driving the vibrating tray to vibrate and feeding powder into the tube from the feeder whilst the pump is operating to generate a forced airflow flowing from the first to the second open end of the tube. By using this method, bridging of the powder is prevented.

Abstract: A method for manufacturing a cutting insert green body having undercuts includes providing a die cavity formed in closed top and bottom dies; closing a bottom of the die cavity by a bottom punch accommodated in a punch tunnel formed in the bottom die; filling the die cavity with a pre-determined amount of sinterable powder; moving a top punch towards the die cavity through a punch tunnel formed in the top die; compacting the powder by urging the top and bottom punches towards each other, thereby forming the green body; and moving the top die and punch away from the bottom die and punch, thereby enabling removal of the formed green body. An apparatus for manufacturing a cutting insert green body having undercuts includes top and bottom dies which abut each other and top and bottom punches which slide in their respective dies.

Abstract: A method of forming dense articles from metal or metal alloy powders by friction forming. A self supporting shaped deposit of powder is formed on a substrate. Relative movement is established between the shaped deposit and a friction forming tool. The forming end of the friction tool is urged into compressive contact with the shaped deposit so as to generate an amount of heat sufficient to plasticize the deposit and thereby form a dense article. The steps may be repeated to built up the article to any pre-desired thickness. The substrate may be removed to establish a free standing coherent article, or the article may be left tightly bonded to the substrate. The article is very uniform in both thickness and composition, and enjoys substantially full density and a very fine microstructure.

Abstract: Radially oriented ring-shaped preliminarily molded pieces of a ring magnet are stacked in an axial direction to form a ring-shaped molded body, in which end faces of the ring-shaped preliminarily molded pieces are bonded together. This ring-shaped molded body is sintered and heat-treated to produce the ring magnet. Ring magnets which are less susceptible to deterioration of magnetic properties due to a disturbance of magnetic orientation near lamination boundary surfaces are produced. The invention provides a method of manufacturing such ring magnets with high efficiency.