Abstract: The filler wire is a closed tube, in whose interior is located a filling of two or more pulverulent material components. With the split tube still open, the filling is introduced in the form of layers and then the split tube is closed. As a result of the filling introduced in layer form, a favorable set of conditions for closing or sealing the tube, for example by welding, is provided.

Abstract: A process and a device for manufacturing an extruded section of an aluminum alloy containing additions of boron or compounds thereof are intended to simplify the manufacture of aluminum alloy sections for use in nuclear science and technology. Using a boron-containing aluminum-based raw material a section is to be formed such that its design ensures adequate stability and at the same time the necessary screening properties. To this end a billet having a core of aluminum alloy with additions of boron or the like and a mantel surrounding the same is manufactured and hot formed by extrusion, such that, using the molten metal route or powder metallurgy, a blank of aluminum alloy of particular alloy groups with additions of boron or its compounds at a concentration of 0.05 to 50 wt % is taken as the starting basis.

Abstract: An electrical contact formed of a mixture of finely divided electrically conductive metal doped with graphite or cadmium oxide. A thin coating of the electrically conductive metal is disposed upon the side of the contact which is adapted to be welded or brazed to an electrically conductive support. The electrical contact is made by mixing the finely divided cadmium oxide and pressing the mixture into a desired shape. A slurry of conductive metal is then sprayed on one side of the contact. After coating, the contact is sintered at a temperature less than the melting point of the electrically conductive material, whereby the contact is formed and the coating is firmly attached to it. The invention is particularly useful with silver or copper-based electrical contacts.

Abstract: A method of making a porous metal article is disclosed comprising:(a) applying a stabilized suspension of a dispersed metal particulate in a fluid medium to a porous metal support;(b) working the support to fill the openings with the stabilized suspension and remove entrained gas;(c) heating the filled support to dry the stabilized suspension and provide the filled support with green or unsintered strength;(d) preferably compressing the dried, filled support to provide better contact between adjacent particles and greater mechanical strength; and(e) sintering the compressed, dried, filled support to remove volatile material and to fuse the individual particles of the metal particulate to the metal support and to each other.The porous metal articles find particular use as filters. They comprise a porous metal support and metal particulate material with the individual particles sinter bonded to each other and to the support.

Abstract: A method for sealing porous metals, which comprises applying powder of a eutectic alloy containing an element having a good diffusibility in a porous metal or powder of a mixture of metals capable of forming the eutectic alloy, to the surface of a porous metal member and heating the surface applied with the powder at a temperature higher than the eutectic temperature of the eutectic alloy to thereby cause the molten eutectic alloy to intrude into pores from the surface of the porous metal member, whereby the melting point of the molten alloy in the pores is promptly increased by diffusion of the element in the porous metal member to solidify the molten metal in the pores, sealing only pores present in the vicinity of the surface of the porous metal member.

Abstract: An article comprising a first portion which is formed porously by sintering of an alloy or cermet material and a second portion which is formed of a metal and intimately bonds to the first portion. For example, the article is a rocker arm for an automotive internal combustion engine, in which first portion is the wear-resistant tip portion and the second portion the body portion. The second portion is formed by molten metal forging, with the sintered first portion set in the mould as an insert, such that the molten metal under pressure is forced to infiltrate into the pores of the sintered first portion at least in a region contiguous to the interface between the first and second portions. This article features very high strength of the bond at the interface between the first and second portions.

Abstract: To produce a sintered metal type brake friction element which beds-in quickly and which has a "feel" similar to a resin-based element, powdered metallic friction material is subjected to a resistance sintering or furnace sintering operation, so as to produce a sintered substrate and an unsintered or partly sintered surface layer which has less wear resistance than the substrate but friction properties which are not substantially less than the substrate. The surface layer may be formed of the same or different material as the substrate layer depending upon the sintering technique chosen.

Abstract: Honeycomb structures, such as those used in turbine engine abradable seals, are provided with a uniform density filling of a suitable abradable material. The abradable material is prepared as a tape preform using an organic binder. The preform is forced into the honeycomb using a rubber tool.

Abstract: A process for forming a substantially planar porous metal coating on a substrate which comprises thermal spraying of the metal on the substrate to form a porous metal coating on the substrate, rolling the sprayed coating to render it substantially planar and in the process close the pores, and then removing part of the surface to improve planarity and to reopen the surface-connected pores of the surface. The metal to be sprayed may be in the form of a wire, powder or molten metal mass and be selected from the group consisting of aluminum, zinc, tin, copper, nickel, or their alloys. Preferably, the substrate is selected from the group consisting of steel, aluminum, aluminized or galvanized steel, tin plate, and plastic. The spraying is preferably conducted in a non-oxidizing or reducing atmosphere. Preferably, the coating on the substrate is subjected to cold rolling. Most preferably, the rolling is conducted so as to reduce the coating thickness to approximately half of its original thickness.

Abstract: A process for the production of valve metal powder, which is doped with boron or boron compounds, for electrolytic capacitors having a low relative leakage current and a high specific charge. The doping with boron or boron compounds in amounts of up to 0.5 percent by weight, relative to the metal content, can take place either during the production of the metal powder or the green valve metal anodes.

Abstract: A process for producing a Cu-infiltrated sintered Fe-base material without requiring a separate Cu infiltration step is disclosed. The process comprises the steps of preparing two powder mixes, one having a predetermined composition with a powder of infiltrating material containing Cu powder or Cu alloy powder as the primary component, and the other having a predetermined composition without said powder of infiltrating material; pressing the two powder mixes into a compact having said powder of infiltrating material present locally; and sintering the compact under ordinary conditions so as to cause the infiltrant to penetrate into the infiltrant-free area simultaneously with the sintering.Also disclosed is a two-layer valve seat produced by this process.

Abstract: A railcar for transporting coal includes steel sheets metallized with an aluminum coating on the interior surfaces thereof normally engaged by coal lading. A coating thickness of substantially 0.006-0.009 inch significantly extends the service life of the railcar by inhibiting corrosion and abrasion of the steel sheets by the coal. The method includes the steps of cleaning all interior surfaces of the railcar sheets prior to a metallizing operation and followed by application of a seal coat.

Abstract: Pyrophorically activated surfaces of metal foil or screen, prepared by diffusing into surface a selectably removable second metal that is then selectively removed as by leaching, can be covered with reactive or inert materials. Reactive materials such as easily ignited metals or carbon or decomposable chemicals increase the heat generated by pyrophoric action. Inert materials slow down or prevent pyrophoric action. Pressure-sensitive adhesive tape in which the adhesive is of the non-transfer or transfer types can be adhered to pyrophorically activated surfaces to slow down action or to adhere material that reduces or increases severity of pyrophoric action. Pyrophoric Ni can be preserved for many months in alkaline solutions such as aqueous KOH, NaOH and triethanolamine. Pyrophoric Fe is prepared and preserved in aqueous alkaline stannite. Even better preservation is obtained for Ni and Fe with glycerine, ethylene glycol, triethanolamine and propylene oxide.

Abstract: A heat resistant machine component, e.g. a gas turbine blade, a vane or the like, for use in a hot-gas atmosphere, especially under dynamic mechanical strain. The engine component comprises a core body consisting of a heat resistant material and a surface layer sprayed thereon and constituted by a composite material. The composite material consists on the one hand of an alloy component containing 1 to 12% Al, namely preferably 3 to 8% Al, 10 to 30% Cr, small quantities of one or more elements in the group Si, Mn, Co, Y and Hf, and the balance Fe, and on the other hand a small quantity of an oxide component containing Al.sub.2 O.sub.3 and possibly one or more oxides of the remaining metals of the alloy component, wherein the pores and the oxide component form elongated, narrow regions, which partly surround or cover the alloy component. The surface layer is applied by flame or arc spraying under a controlled minor oxidation.

Abstract: A powder compression molding method for producing a multilayer powder compression molded article having a plurality of different material layers disposed in a compression direction utilizes relative movements between an upper punch, a lower punch, a die having a step formed therein, and two feed shoes. The powder compression molded article thus formed requires a reduced amount of a special layer. The powder compression molding method includes forming a first space by moving the die relative to the lower punch, introducing a first powder into the first space through a first feed shoe, lowering the lower punch relative to the die to form a second space so that an upper surface of the first powder on the step of the die and on the lower punch has a nonuniform height, introducing a second powder into the second space, and moving the upper punch towards the lower punch to compress the first and second powders.

Abstract: A composition of material for use as a friction lining with a cast iron mating surface. The friction lining has an iron powder base that reacts with tin to alloy and hold substantially equal weight percentages of graphite and coke in a fixed position. The friction lining has a substantially constant wear rate up to 300.degree. C. and a linear wear rate between 300.degree.-500.degree. C.

Abstract: A piston ring produced by a powder metallurgical method has a nearly triangular zone in cross section made of a low density sintered alloy metal powder. One edge of an outer peripheral surface or bottom surface of the piston ring forms a vertex of the triangular zone. The remainder of the piston ring is composed of a high density sintered alloy metal powder. This piston ring has a high abrasion resistance at the area thereof which slides on the cylinder wall and can be produced at low cost.

Abstract: An article of improved wear characteristics and composed of a relatively low wear resistant base metal coated by a particulate refractory metal having a melting point of at least 1490.degree. C. deposited within the near-surface region thereof comprising a base metal or alloy of relatively low wear resistance, a refractory metal deposited within said near-surface region, said refractory metal being selectively deposited in the form of discrete particles, and the particles being idiomorphic or blocky or equiaxial or spheroidal or acicular or dendritic and a plurality of these particles having dimensions of less than 10 micrometers, a plurality of the particles being contiguous to form clusters of the particles that are spaced from each other. The clusters of particles may form microscopic regions of refractory metal which in turn may produce macroscopic regions of refractory metal having the appearance of a continuous coating.

Abstract: An abrasion resistant sintered alloy for use in internal combustion engines which comprises 0.5 to 4.0% by weight of carbon, 5.0 to 30.0% by weight of Cr, 1.5 to 16.0% by weight of Nb, 0.1 to 4.0% by weight of Mo, 0.1 to 10.0% by weight of Ni and 0.1 to 5.0% by weight of P, which permits liquid-phase sintering at temperatures not higher than 1,250.degree. C., and have 0.2 to 10% by volume of sintering pores at least 40% of which consist of pores having a pore size of not larger than 150 .mu.m, is disclosed.

Abstract: A method of fabricating a rock bit insert which has improved wear characteristics is disclosed. Selected surfaces of the insert are implanted with a harder grade of tungsten carbide and sintered thereto. The special insert then would find application in the gage row of, for example, a roller cone rock bit.

Abstract: The present invention relates to a sintered porous metal plate which comprises metal particles directly and integrally bonded together by sintering under pressure, said plate being of a porous structure and having a density gradient in the direction of thickness. The present invention is also directed to a method of making such a sintered porous plate.

Abstract: A sliding member, particularly adapted for use in an internal combustion engine, having a sprayed-on sliding surface consisting of 95.5 to 99.5% metal carbide such as chromium carbide and the remainder molybdenum. The hardness of the metal carbide is in a range of H.sub.v 750 to H.sub.v 2,000, the porosity of the layer is 30% or less and the thickness of the layer is 2.5 mm or less.

Abstract: A method of adhering a ceramic facing material to an underlying substrate is disclosed. Substrates to which the concepts apply include unsupported low modulus, porous wire pads as well as low modulus, porous wire pads backed by a solid metallic form. The ceramic application techniques employed are centered around the impregnation of the regions of the pad to be ceramic coated with an underlayment coating, such as MCrAlY material, wherein the designation "M" stands for at least one of the elements from the iron cobalt and nickel group. Deep penetration of the underlayment material into the pad is achieved with a high velocity, spraying process. Ceramic material is applied over the underlayment material by conventional spraying techniques.Articles of manufacture which are suited to fabrication in accordance with the concepts disclosed herein include, but are not limited to, outer air seals, combustion chambers, and airfoils of gas turbine engines.

Abstract: A highly electrically conductive composite electrode is provided which comprises an inner layer of an electrically conductive metal, a first outer layer of pressed and sintered powdered titanium metallurgically bonded thereto and a second outer layer of porous sintered powdered titanium bonded to the surface of the first outer layer, the first outer layer of powdered titanium being compacted to a degree sufficient to render it essentially impermeable to aqueous brine and the surface of the second outer layer having an apparent density of from about 30 to about 90 percent.

Abstract: The invention concerns a process for the manufacture of pieces comprising least one part of an abradable, porous material, which may be integral with a support part. The process is characterized in that synthesis by diffusion of the abradable material is effected in a mold, at least one part of which constitutes the support piece.

Abstract: In one embodiment, a compact for tools, such as cutting, drilling and shaping tools, consists essentially of self-bonded abrasive particles. The bonded particles define a substantially continuous interconnected network of pores, dispersed throughout the compact. The method for making such a compact comprises the steps of bonding a mass of abrasive particles, aided by a sintering aid material, under high temperatures and pressures (HP/HT) to form an abrasive body comprised of said particles in a self-bonded form and said material infiltrated throughout the body. The body is then treated to remove substantially all infiltrated material, thereby to produce a compact consisting essentially of the self-bonded abrasive particles. In another embodiment, a composite compact which is made in a similar manner to the first embodiment consists essentially of a layer of self-bonded abrasive particle and a substrate layer (preferably of cemented carbide) bonded to the abrasive particle layer.

Abstract: In a composite bearing material including a metal strip, a porous sintered metal matrix layer bonded to a surface of said metal strip and a resin composition impregnated into and substantially filling the voids in said porous metal layer and forming a continuous surface layer thereon, the resin composition consists essentially of a blend of 60 to 95 percent by weight of polytetrafluoroethylene and 40 to 5 percent by weight of a copolymer of tetrafluoroethylene and hexafluoropropylene, and mostly all of the copolymer in the composition is included in the surface layer in the form of a fibrillated network.

Abstract: A porous composite structure comprising a sintered mixture of metal particles and alumina particles, and a method for producing this composite. The composite is useful as a catalyst support, particularly in apparatus designed to reduce pollutant emissions from automobile engines.

Abstract: To reduce costs and permit use of a smaller amount of noble metals in nobel metal contacts, a common metal contact material which forms, in an oxygen-containing atmosphere or in air, non-porous insulating oxides, is coated with a porous noble metal or noble metal alloy cover layer, the pores or regions not covered by the noble metal or nobel metal alloy being permitted to oxidize to form a protective common metal contact material oxide, the noble metal regions in contact with the underlying contact material itself providing for the electrical connection. Preferably, the porous cover layer has a thickness of between about 0.1 to 0.2 .mu.m, and the contact material, separately or applied to a carrier, has a thickness of between 2 to 100 .mu.m, preferably about 10 .mu.

Abstract: Disclosed is a flywheel assembly for recording and or reproducing devices which is produced by molding and sintering a mixture consisting principally of iron and graphite powders and, if necessary, a sulfur powder.

Abstract: A porous composite structure comprising a sintered mixture of metal particles and alumina particles, and a method for producing this composite. The composite is useful as a catalyst support, particularly in apparatus designed to reduce pollutant emissions from automobile engines.