Abstract: The invention describes a cutting tool, preferably a cutoff parting tool, having one or more replaceable cutting inserts. The cutting inserts comprises on the supporting and/or clamping surfaces embossed elements. Upon clamping the cutting inserts these elements cause a plastic deformation of the contact surfaces on the toolholder. In this fashion, the cutting inserts are additionally stabilized against lateral compressive forces and tensile forces forcing them out of the seat.

Abstract: A method for the manufacture of a poppet valve made of a .gamma.-TiAl base alloy for internal combustion engines. In this method, the .gamma.-TiAl blank is first subjected to primary forming, for example, by extrusion, in such a manner that thereafter it has approximately the diameter of a valve head and the material properties required for the valve head. The secondary forming is then carried out by extrusion using a die designed in such a manner that the diameter of the inlet opening corresponds approximately to that of the blank after primary forming, and a cylindrical section corresponding to this diameter, followed by a transition in the form of a narrowing which corresponds approximately to the valve cone to the outlet opening. The outlet opening has at least approximately the same diameter as the diameter of the valve shaft. The extrusion process is terminated when the desired thickness of the valve head has been attained.

Abstract: The preparation of suitable powdered metal is important in powder metallurgy technology. To date, powdered metals, in particular refractory metals, have been produced using very time-consuming and, consequently, costly methods for the reduction of metallic compounds, e.g. by reducing solid metallic compounds to powdered metal in fluidized bed ovens or pusher-type furnaces. In the present invention, powdered metallic compounds are reduced by retaining the solid phase as a continuous process by particles passing through a reaction chamber to predetermined orbits. The process lasts on average 0.4 to 60 s, and the level of completeness of the process is at least 90%.

Abstract: A filtering cartridge made of compacted and sintered particles is manufactured from a powder consisting of chromium or a chromium alloy with at least 70% Cr by weight and a particle size of the chromium particles between 160 .mu.m and 500 .mu.m. Filtering cartridges of this type can be used advantageously, particularly in gas clarification for energy production by biomass gasification or coal gasification, in cracking processes in the petroleum industry, as well as for the production of melamine resin.

Abstract: The invention relates to a hard solder for high-temperature soldered joints joining high temperature-resistant materials, especially chromium and alloys based on chromium. The hard solder consists of 40% to 70% by weight chromium, up to 2% by weight of one or several of the metals selected from the group of vanadium, niobium, tantalum, titanium, zirconium and hafnium, up to 2% by weight of one or several of the metals or their oxides selected from the group of rare earths and yttrium, as well as nickel as the balance. The solder according to the present invention is particularly suitable for joining by soldering parts in solid-electrolyte, high-temperature fuel cells.

Abstract: A process for manufacturing a structural element with brazed-on, bent or folded metal foil components having a foil thickness of less than 500 .mu.m, made of an ODS sintered ferrous material. The sintered material is manufactured by mechanically alloying the basic powders, hot pressing and/or extruding, and subsequently hot-rolling, cold-rolling and final recrystalization annealing to form the sintered material into a foil having improved mechanical strength properties. After the cold-rolling step, the foil material is annealed so that the foil may be thereafter bent and folded at room temperature. The bent and/or folded foil is recrystallization-annealed at a temperature between 1100.degree. and 1300.degree. C. during 3-600 minutes, simultaneously with a brazing operation, in a single process step.

Abstract: The invention relates to an oxidation inhibitor coating for high-melting metals selected from the group of molybdenum, tungsten, tantalum and niobium and/or alloys thereof. The oxidation inhibitor coating comprises 1 to 14% by weight boron, 0.1 to 4% by weight carbon and the balance silicon.

Abstract: A process for manufacturing a structural element capable of carrying high thermal loads, such as a heat shield for fusion reactors. The structural element comprises components of high heat-resistant material (such as graphite) joined to metallic components. A metallic, ductile intermediate layer is applied to the components of high heat-resistant material and then, the components of high heat-resistant material and metallic components are joined by high-energy beam welding.

Abstract: The invention pertains to a charging rack for firing objects composed of ceramic or glass ceramic materials in kiln, in particular a continuous kiln. The charging rack takes the form of a grate and comprises a frame and a number of bearing parts. The frame is made from a dispersion-hardened iron- or nickel-based alloy and bearing parts are made of the same dispersion-strengthened iron- or nickel-based alloy or from silicon carbide, an oxide ceramic material, a superalloy or a steel.

Abstract: The present invention relates to a strip-like current feeder based on molybdenum-yttrium oxide, for electric lamps with a metal/glass sealing. In addition to molybdenum-yttrium oxide, the strip material contains 0.03 to 1.0% by weight cerium oxide and the ratio of cerium oxide to yttrium oxide amounts to 0.1 to 1. As compared to known current feeders, the current feeder according to the present invention has a distinctly enhanced resistance to corrosion or oxidation.

Abstract: A heavily thermally stressable component comprising a graphite and a metal part, e.g., copper or a copper alloy, soldered together. Between the solder and the metal part there is an intermediate layer comprising chromium or an alloy containing a substantial proportion of chromium with copper and/or nickel additives. This special intermediate layer provides a good bond between the graphite and the metal which remains stable even under the heaviest cyclic thermal stresses.

Abstract: The invention relates to a method of producing an X-ray rotary anode having a focal track region composed of refractory metals. The focal track region is manufactured by means of powder-metallurgy methods or by means of CVD or PVD methods. According to the invention, the focal track region is posttreated using high-energy electrons or photons by means of local, superficial melting to a depth of less than 1.5 mm. This reduces, in particular, the residual porosity in the focal track region. That results in improved mechanical properties, higher X-ray yield and markedly improved service life of such rotary anodes.

Abstract: The present invention relates to an oxide coating layer for improving the thermal emissivity of metallic X-ray tube anodes as well as improving the layer properties and effects displayed by the oxide coating. The oxide coating layer includes 1-20% by weight, and preferably, 4-7% by weight, of aluminum oxide. The layer additionally includes small proportions of other compounds and contains the oxides of the metals Ti and Zr and is applied to the x-ray anode by standard deposition processes. It is essential that the titanium dioxide content is less than 20% by weight of the oxide coating layer and the zirconium oxide content is greater than 60% by weight of the oxide coating layer. The coating layer may also include a stabilizing component, such as CaO.

Abstract: The invention relates to a method of making high-strength brazed joints in metal/ceramic and ceramic/ceramic composite materials. The brazing surface of the ceramic part is structured prior to brazing by introducing bores having an average diameter in the range of 50 .mu.m-500 .mu.m and a depth in the range of 100 .mu.m-2 mm. Preferably, the structuring is effected by laser working. Brazing is subsequently carried out in a conventional manner. The resulting joint displays increased strength characteristics and resistance to thermal stresses over joints produced by conventional methods.

Abstract: An X-ray anode, in particular a rotary anode, having a parent body made of a carbon-containing refractory material. To improve the thermal radiation characteristics of the anode, the anode is provided with an oxidic top layer outside the focal spot or the focal track regions which contains a homogeneously fused phase. A two-ply interlayer arrangement, containing a first-ply of molybdenum and/or tungsten, and a second oxidic ply of Al.sub.2 O.sub.3, containing 1-30% by weight of TiO.sub.2, is arranged between the parent body and the oxidic top layer. As a result of this interlayer structure, the fusion of the oxidic top layer so as to form a homogeneous phase becomes possible without problems. In addition, the ageing resistance of the thermal emission coefficient (".epsilon.") is substantially improved.

Abstract: The invention relates to enhancing the thermal emissivity of metal X-ray tube anodes by means of applying an oxide coating to the anode. The oxide coating layer is formed of a mixture of zirconium oxide, titanium oxide, aluminum oxide and/or calcium oxide, with silicon oxide added from about 1-20% by weight of said oxide coating layer. Preferably, the coating includes from about 4-7% by weight of silicon oxide. The oxide coating layer is then applied to the anode pursuant to a standard method such as plasma spraying. The oxide coating, as formulated, displays improved layering characteristics over prior formulations while retaining good thermal emissivity and adhesive properties. Moreover, the formulation according to the invention enables an improved application to the anode of such oxides or oxide compounds over previous formulations, without negatively affecting the layer adhesion or thermal emission coefficient properties of the coating.

Abstract: A composite body for rotary anodes of X-ray tubes is made from graphite, a carbide-forming, high-melting metal component and a multi-layered intermediate layer. The first layer of the intermediate layer closest to the graphite is made up of a metal or an alloy thereof which does not form a carbide. Applied over the first layer are at least two double layers. Each double layer has one individual layer of at least one carbide-forming metal or at least one carbide thereof, and a second individual layer of a metal or an alloy thereof which does not form a carbide. Preferred carbide-forming metals are tungsten, tantalum, hafnium and niobium. Preferred metals which do not form carbides are rhenium and platinum. In a preferred embodiment, the composite body is a rotary anode for X-ray tubes, with a basic body made of graphite and a burning track made of tungsten or a tungsten-rhenium alloy applied directly to the intermediate layer.

Abstract: In a process for manufacturing semi-finished products from sintered refractory metal alloys with a stacked microstructure, the sinter feed reshaped by at least 85% is subjected prior to recrystallization annealing to an intermediate annealing for at least 20 minutes at a temperature not less than 700.degree. C. and not greater than that at which no further recrystallization occurs. Following this intermediate annealing, the hot feed is deformed by a further 3% to 30%. The process makes it possible to manufacture semi-finished products with a good stacked microstructure and of substantially greater dimensions, or of the same dimensions and a substantially better stacked microstructure, than can be obtained with known manufacturing processes.