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6599374 |
An end product containing iron carbide (Fe 3 C) is produced from an intermediate product consisting of granular, directly reduced iron. Said intermediate product is supplied by an iron ore reduction plant and is fed to a carburization re...
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6428742 |
A method for heat-treating metallic workpieces, in which a flow of cooling gas is generated in a vacuum furnace by a fan in order to quench the workpieces, with the fan being driven by a rotary current motor that is operated with a prede...
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6328818 |
The present invention features nitriding-treating the ferrous material to form a nitrided layer composed of at least one of iron nitride and iron carbide nitride on the surface thereof, and heating to maintain the ferrous material at a t...
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5798002 |
In order to produce a carbon solid solution or carbide-containing surface layer on a substrate, the substrate is immersed into a cold bath of liquid active medium, and heated inside the liquid active medium by heating means immersed in t...
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5443662 |
A nitride or carbonitride layer is formed on the surface of a metal material as follows: A treating agent composed of a refractory powder of alumina or the like and a powder of a metal for forming a nitride or a carbide or an alloy there...
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5399207 |
A process and apparatus for forming a hardened outer shell (40) on a refractory metal workpiece (36) preferably heated in a fluidized bed of metallic oxide particles (38) in an environment of an inert gas and a reactive gas with the reac...
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5194228 |
An endothermic gas generator having separate sources of oxygen and hydrocarbon gas at pressures above the pressure of the endothermic gas to be produced, the sources of oxygen and hydrocarbon gas being interconnected through separate pre...
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5039357 |
A method for nitriding and nitrocarburizing the bores of rifle barrels or similar elongated hollow objects in which a funnel is attached to the inlet end of each of rifle barrel prior to treatment. The rifle barrels are then loaded into ...
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5037491 |
A method for improving the wear characteristics and corrosion resistance of a metal surface having the basic steps of: A. case hardening the metal surface by placing the metal in a fluidized bed and exposing it to a first atmosphere o...
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4892759 |
Particles of a layer-forming agent containing at least one element for forming a surface layer of e.g. a carbide on the material to be treated are disposed in a furnace below and/or at the side of the material to be treated. A fluidizing...
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4871401 |
A method of forming a nitride or carbonitride layer on the surface of an iron or iron alloy article, which comprises the steps of: (a) disposing in a fluidized bed furnace a treating agent comprising a refractory powder, a metal powder o...
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4869756 |
The process carburizes a steel workpiece, particularly a steel piece made of casehardened steel, to a predetermined surface carbon content in a fluidized bed oven. In a first carburizing step one carburizing gas is used whose carbon cont...
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4756774 |
A method for improving the wear characteristics and corrosion resistance of a metal surface having the basic steps of: A. case hardening the metal surface by placing the metal in a fluidized bed and exposing it to a first atmosphere o...
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4686117 |
A method of forming a layer of the carbide of titanium, vanadium, etc. on the surface of an article containing carbon by employing a fluidized bed furnace. The formation of the layer is effected by disposing in the furnace a coating agen...
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4569862 |
A method of forming a layer of a nitride or carbonitride of titanium, vanadium or the like on the surface of an article to be treated includes: disposing a treating material composed of refractory powder, powder of a metal or alloy of a ...
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4547228 |
This application disclosed a method and apparatus for conducting various metal treatment processes including nitriding, carbonitriding, nitrocarburizing, surface activation, and selective oxidation in any desired sequence in the same flu...
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4512821 |
The present invention involves an apparatus and method for heat treating metal workpieces in chemically controlled environments produced by decomposition of an atmosphere precursor, e.g. methanol or ethyl acetate, introduced to a heated ...
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4461656 |
The surface of a ferrous metal workpiece is heat treated by immersing the workpiece to be treated in the fluidized particulate bed of a fluidized bed furnace. The bed is fluidized by a gas atmosphere comprising ammonia gas, hydrocarbon g...
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4385929 |
A metal powder of improved quality is obtained by causing molten metal held in a vessel to flow out in a smooth stream through an outlet formed at the bottom of the vessel, throwing the jet of an atomizing medium consisting of nonpolar s...
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4340433 |
This invention relates to a method of heat treating articles which utilizes a fluidized bed comprising a container containing a mass of refractory particles and having a porous base, a layer of such particles adjacent to the porous base ...
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3336167 |
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3197346 |
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3099589 |
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3096221 |
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