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7431778 |
The invention relates to case-hardening of a stainless steel article by means of gas including carbon and/or nitrogen, whereby carbon and/or nitrogen atoms diffuse through the surface into the article. The method includes activating the ...
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6972256 |
The present invention relates to a method of and an apparatus for forming a thin metal film of copper, silver, or the like on a surface of a semiconductor or another substrate. A method of forming a thin metal film, comprises preparing a...
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6517642 |
A thin film of metal or metal compound is produced by preparing an ultrafine particle dispersion liquid by dispersing ultrafine particles at least partly made of metal into a given organic solvent, applying the ultrafine particle dispers...
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6413326 |
A threaded steel coupling with an exterior coating and interior case and threads, wherein the coupling body consists primarily of bainite and the interior case and threads consist primarily of a mixture of martensite and bainite. Also pr...
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6413061 |
A rotary compressor comprises a cylinder having an inner space and a groove, a roller sliding along the inside of the inner space of the cylinder, a vane penetrating through the groove, and refrigerant. The groove penetrates through the ...
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6383306 |
A nickel-base superalloy article substrate has more nickel than any other element and a nominal bulk composition of carbon. A protective layer is deposited overlying the surface of the article substrate. The protective layer includes alu...
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6197125 |
A method for improving the corrosion resistance, increasing the hardness, providing superior ductility, and reducing surface-cracking of a diffusion coating by nitriding and heating-treating the diffusion coating is disclosed. The nitrid...
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6165286 |
A method of aluminum diffusion coating the surface of an iron-, nickel-, cobalt-, or titanium-base alloy product begins with cleaning and providing an anchor profile on the surface of the product, followed by depositing with an appropria...
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6093303 |
A method for case hardening a chromium bearing nickel or ferrous based alloy, for example stainless steel, article, the method including the steps of activating the surface of the article; and carburizing the activated surface at a tempe...
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6090223 |
By forming a Cr playing layer on the surface of a metal and forming a CrN film by nitriding the surface thereof, it is possible to improve the surface hardness, wear resistance, corrosion resistance, etc., of the metal; wherein the nitri...
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6086684 |
A surface treating is performed by an electric discharge. The electric discharge is generated by applying a voltage between an electrode and a metal workpiece. The electrode is a solid or green compact electrode or the like which is made...
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5810947 |
The adhesive strength and hardness of chromium nitride(CrN) film deposited on SKD 61 tool steel was significantly enhanced by a nitriding process on the surface the tool steel before coating with a CrN film. These nitriding processes inc...
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5725682 |
Brazing alloys used in a method of brazing at least two steel components into an integral part during a carburizing treatment followed by a quenching treatment are disclosed. These alloys should be in a liquid phase during the carburizin...
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5669988 |
Object: Prevention of generation of press marks as well as increase of wear resistance at a corrugation tip portion and thereby providing a corrugating roll having a much improved life. Construction: A manufacturing method of a corrugati...
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5653822 |
A method of applying a surface coating to promote gas carburization of a highly alloyed steel. The method includes the step of coating the highly alloyed steel with a layer of iron or an iron alloy to form a coated steel before carburizi...
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5637158 |
A method of manufacturing an expansible anchor comprises the steps of forming one part as a partially slotted expansible sleeve composed of corrosion-resistant steel and anchorable in a building component, forming another part as an expa...
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5571341 |
A process for the thermochemical treatment of thin-walled structural elements made of steel comprising enriching an edge zone of a thin-walled structural element with nitrogen and carbon at 590° to 700° C. to harden the edge zone where...
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5433796 |
In the preparation of a galvanized steel strip by continuously heating and anneal reducing a steel strip and subsequently admitting it, without contact with the ambient air, into a molten zinc bath to coat the strip with zinc, there is p...
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5346560 |
Precision ferrous metal parts subject to severe friction and corrosion in e are nitrided, preferably in a bath of molten salts based on CNO - cyanate ions, oxidized, preferably in baths of molten oxidizing alkaline salts, and then impre...
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5334263 |
A superalloy article has a nickel-based superalloy substrate containing TCP-phase forming elements such as rhenium, chromium, tantalum and tungsten. A carbide precipitate-containing region is formed within the substrate extending to a ca...
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5294264 |
A method of nitriding a refractory-nitride forming metal or metalloid articles and composite articles. A consolidated metal or metalloid article or composite is placed inside a microwave oven and nitrogen containing gas is introduced int...
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5228929 |
Disclosed is a process for manufacturing a corrosion resistant iron-alloy, powered metal or sintered carbide component. In a first step, the component is subjected to an initial thermochemical treatment preferably consisting of nitriding...
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5226975 |
A method of forming a wear-resistant coating for internal combustion engine component parts which allows the part to remain dimensionally stable under severe engine operating conditions is provided. The coating is formed by a two step me...
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5190598 |
The steam turbine components having erosion resistant multiple treatments are disclosed. The components include a ferrous substrate having an integral boride layer which typically reduces the underlying fatigue strength of the substrate ...
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5154779 |
A method of nitriding an article of refractory-nitride-forming metal or metalloids. A consolidated metal or metalloid article is placed inside a microwave oven and nitrogen containing gas is introduced into the microwave oven. The metal ...
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5094699 |
A method of manufacturing high strength and hard metallic composite layer materials by connecting several metal layers with one another, includes forming the metal layers as flat products by rolling from a metal with low base strength, a...
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4918806 |
In a method for manufacturing a piston a metal piston is prepared which has a skirt tapered towards the bottom end to such an extent that a diameter of the metal piston becomes uniform after a heat treating step. The metal piston is heat...
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4814026 |
In the production of composite welded components the workpieces are joined together only partially machined and are then jointly subjected to a heat treatment for hardening their surface, the welding gap formed by their contact surfaces ...
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4781770 |
A cone blank for a rotary cone rock bit is forged, rough machined, carburized and heat-treated, followed by the formation of insert holes therein. Inserts are then pressed into the insert holes. The finished cone is subsequently sprayed ...
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4746375 |
A method of catalytically activating refractory metal surfaces for the subsequent electroless plating of another metal thereon is disclosed, in which the refractory surface is treated while heated in a carburizing atmosphere under condit...
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4660611 |
An improved passenger car tire chain employing heat treated medium carbon steel is disclosed. The improved tire chain is approximately twice as durable as that presently furnished to meet NACM-5179(TC) for Type PL chains when AISI 1026 o...
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4660444 |
Bearing surfaces or other selected areas of component parts of a rotary cone earth boring rockbit are carburized or otherwise surface enriched by the sequential steps of coating the selected surface area to be enriched with a non-water b...
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4659628 |
A paint priming method which forms, on the surface part of a ferrous material to be treated, a nitride layer with an adequate depth and preferably ε phase as a main phase thereof, and with no carbon adhesion to the surface thereof, by c...
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4643051 |
A method of manufacturing an earth boring bit of the type having a bearing pin which extends from a head section of the drill bit for rotatably mounting a cutter. A container is provided having opposing end openings with sidewalls thereb...
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4568393 |
A hard corrosion resistant surface is provided on a ferrous substrate by first overlay welding onto the substrate surface a chromium containing ferrous material. The deposited overlay can then be machined. It is thereafter subjected to a...
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4482399 |
A nitrided cast iron product comprising cast iron matrix material and graphite particles distributed in the matrix material, a nitrided layer formed in a surface of the cast iron product and having gaps between the graphite particles and...
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4442169 |
An article of manufacture adapted for use as a cutting tool is provided with an aluminum oxide coated substrate having layers of TiN and/or TiC deposited thereon, whereby the beneficial characteristics of the TiN, TiC and Al 2 O 3 coat...
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4427461 |
A method of internally nitriding and brazing assemblies having iron based components to which titanium has been internally added prior to casting. A brazed assembly includes iron based components to which titanium is added prior to casti...
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4412873 |
Sintered metal articles especially sealing rings of less than 25 mm diameter are formed by plating sintered metal skeletons with a metal of lower melting point than the metal of the skeletons, for example, copper. The plated skeletons ar...
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4294630 |
A method for continuously treating an iron member wherein the iron member is first subjected to furnace-brazing in a controlled gas environment and subsequently to a soft-nitriding treatment by addition of ammonia gas (NH 3 ) to the cont...
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4204886 |
A method of improving resistance of ferrous parts to wear failure such as galling and seizure, and parts having such increased resistance are disclosed. The invention includes a two step process wherein the part is first nitrided to prov...
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4145798 |
A novel and improved method of forging preselected recessed surfaces in a member is disclosed which comprises the steps of adding a suitable lubricant material to at least a slave or primary preform member wherein the lubricant material ...
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4123294 |
A method is disclosed for treating scrap metal chips and turnings containing a valuable metal layer of silver, gold, or copper and a ductile layer of ferritic steel or ductile iron to recover the valuable metal. The chips and turnings ar...
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4054468 |
A corrosion-resistant spinneret, suitable for spinning filaments of poly(p-phenylene terephthalamide) from a viscous solution of the polymer in 98-100 percent sulfuric acid, is prepared from a plate of tantalum alloy or stainless steel w...
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4013487 |
A case-hardened, corrosion-resistant steel article is provided which comprises, applying a coating of nickel and/or cobalt to the surface of the article and then subjecting said coated article to carburization by heating said coated arti...
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4001054 |
Metal pipe or tubing having increased strength and toughness in a direction transverse to its axis, designed to prevent fractures and inhibit fracture propagation, for example in pipelines carrying fluids such as natural gas or oil. The ...
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RE28918 |
The friction surface of a cast iron side wall member for a rotary piston engine is hardened by iontriding in an electrical glow discharge in a gas atmosphere containing nitrogen, after coating the areas not to be hardened, to inhibit glo...
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3944443 |
A method for treating metals and metal surfaces is disclosed. The method includes the use of a plasma gas generated by an induction plasma system. In one embodiment, a cutting tool, such as a saw blade or razor blade is passed into conta...
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3837931 |
A composite iron-base metal product comprising an iron-base metal in which a martensitic structure having a high mechanical strength is formed in a particular portion of the base metal in such a manner that the tensile strength and ruptu...
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3829260 |
Herein disclosed is an improved wear-resistant metal object and a method for the manufacture thereof. The metal object is formed by spraying fine particles of a nickel-chrome based self-fluxing alloy onto a surface of a base metal for fo...
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