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| Number | Title | Issue Date |
| 8152935 | Vacuum carburization method and vacuum carburization apparatus There are provided a method, between a diffusion process and a quenching process, a normalizing process of performing step cooling in which a temperature lowering treatment and a temperature keeping treatment are alternately repeated plural times so that a temperatu... | 04/10/2012 |
| 8123873 | Method for manufacturing carburized part, and steel part A method for manufacturing a carburized part that includes vacuum carburizing a steel under a reduced pressure of 2 kPa or less, so that a surface carbon concentration after slow cooling performed after carburizing falls in a range of 0.9 to 1.5%, performing the slo... | 02/28/2012 |
| 7918944 | Surface carburization technique of medical titanium alloy femoral head in hip arthroplasty A surface carburization technique of medical titanium alloy femoral head in total hip arthroplasty comprises subjecting medical titanium alloy TC4 to surface carburization by using acetylene as carburizing agent to carry out gaseous carburization at high temperature... | 04/05/2011 |
| 7575643 | Carburization treatment method The invention provides a carburization treatment method in which the carburization treatment is conducted under a condition where an atmosphere within the furnace is maintained at a high carbon potential which is slightly blow a carbon solid solubility. Preferably, ... | 08/18/2009 |
| 7513958 | Hydrocarbon gas mixture for the under-pressure carburizing of steel The subject of present invention relates to mixture for carburizing of steel products, mainly parts of machines, vehicles and every mechanical apparatus, used in vacuum furnaces. Present invention relates to mixture for under-pressure carburizing containing the carb... | 04/07/2009 |
| 7357843 | Vacuum heat treating method and apparatus therefor The present invention provides a vacuum heat treating method, such as carburization, carbonitridation, high temperature carburization, high concentration carburization and the like, performed while supplying a mixed gas of ethylene gas and hydrogen gas under reduced... | 04/15/2008 |
| 7276204 | Carburization treatment method and carburization treatment apparatus The invention provides a carburization treatment method in which a carburization treatment is conducted simultaneously with an operation of supplying a hydrocarbon gas and an oxidative gas into a furnace kept under a reduced pressure. Preferably, the internal pressu... | 10/02/2007 |
| 7208052 | Method for carburizing steel components A carburizing process for increasing the hardness of a case region of a steel component. In one form the application includes plating the outer surface of a stainless steel component with nickel prior to carburizing. One component includes a stainless steel object h... | 04/24/2007 |
| 7195177 | Method and apparatus for humidity control within a housing An apparatus includes a housing having a chamber, having a replaceable part which has a moisture adsorption characteristic and which is in communication with the chamber, and having a humidity monitoring section which is responsive to the humidity within the chamber... | 03/27/2007 |
| 7122086 | Rolling support device and method for manufacturing the same A rolling support device excellent in both of the characteristics of durability and corrosion resistance is provided. The inner ring (1) and the outer ring (2) comprises an austenitic stainless steel and has, on a raceway surface, a carburizing hardene... | 10/17/2006 |
| 7118634 | Low-pressure cementation method The invention relates to a low-pressure carburising method comprising alternating low-pressure enrichment steps and diffusion steps in the presence of a neutral gas. During the enrichment steps, an enriching gas and neutral gas mixture is used, the proportion of the... | 10/10/2006 |
| 7112248 | Vacuum carbo-nitriding method A vacuum carbonitriding method includes: performing a vacuum carburizing process on an object to be treated (a workpiece) in a heat treating furnace under reduced pressures by supplying a carburizing gas into the furnace that has been heated to a predetermined carbu... | 09/26/2006 |
| 7108756 | Method for heat-treating work pieces made of temperature-resistant steels A method of producing a workpiece of a heat-resistant steel, such as hot forming tool steel, where the workpiece may be hardened and depassivated after mechanical machining and electrochemical treatment. The hardening including a reduction step, so that no depassiva... | 09/19/2006 |
| 7033446 | Vacuum carburizing with unsaturated aromatic hydrocarbons Vacuum carburizing of ferrous workpieces is performed at low pressure in a vacuum furnace using an unsaturated aromatic such as benzene as the carburizing medium. The unsaturated aromatic is gas phase hydrogenated into a napthenes, such as cyclohexane, which is mete... | 04/25/2006 |
| 7029540 | Method of gas carburizing In a first process of a method of gas carburizing, a steel treatment object in a carburizing atmosphere containing carburizing gas is heated to an initial set temperature which is not higher than a peritectic point at which δ iron and a liquid phase transform into ... | 04/18/2006 |
| 6364965 | Aluminum-containing member and a method for producing such an aluminum-containing member A method for producing an aluminum-containing member, comprising the steps of heating a substrate containing at least metallic aluminum in vacuum of not more than 10-3 torrs, and continuing with the heating step, forming a nitride in a surface ... | 04/02/2002 |
| 6268045 | Hard material coating of a cemented carbide or carbide containing cermet substrate The present invention relates to a component, for example a tool, coated with a hard material, in particular diamond, a process for its production and a device for carrying out the process. The process for the production of the component coated with the h... | 07/31/2001 |
| 6221173 | Titanium or titanium alloy member and surface treatment method therefor Disposing the titanium or titanium alloy in a vacuum vessel, and applying annealing treatment thereto by heating (a heating process); feeding a mixed gas consisting primarily of nitrogen with a trace of oxygen component into the vessel, and heating inside... | 04/24/2001 |
| 6187111 | Vacuum carburizing method An improved vacuum carburizing method is provided which is easy to handle or to maintenance and low equipment costs without using hydrogen gas or acetylenic gas. The improved vacuum carburizing method comprises a carburizing treatment of workpieces made f... | 02/13/2001 |
| 6017401 | Conductivity improvement in thin films of refractory metal A method of increasing conductivity of a refractory metal film disposed upon a substrate includes exposing the refractory metal film to an atmosphere comprising a silane of the form Sin H.sub.(2n+2), where n is a positive integer, while subject... | 01/25/2000 |
| 5702540 | Vacuum carburizing method and device, and carburized products In order to keep down soot production and to enable every part of the workpiece, including deep concavities to be uniformly carburized by vacuum carburizing, and to enable decreases in the quantities of gas and heat employed, carburizing treatment is perf... | 12/30/1997 |
| 5399207 | Process for surface hardening of refractory metal workpieces 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 reactive gas either ox... | 03/21/1995 |
| 5205873 | Process for the low pressure carburization of metal alloy parts A low pressure carburization process for metal alloy parts uses a fuel mixture consisting of hydrogen with 2 to 60% by volume ethylene. The fuel mixture is heated to a temperature between 820° and 1100° C. A furnace installation for carrying out the pro... | 04/27/1993 |
| 4853046 | Ion carburizing A heat treat process is disclosed for use in an ion glow discharge chamber for carburizing ferrous workpieces. The process provides rapid carburizing cycles by optimizing the power supplied to the glow discharge correlated to temperature and desired unifo... | 08/01/1989 |
| 4836864 | Method of gas carburizing and hardening A method of gas carburizing and hardening a steel article and a continuous furnace therefor. The method includes the steps of carburizing the article in a carburizing atmosphere at atmospheric pressure, heating the article in a vacuum for a predetermined ... | 06/06/1989 |
| 4710238 | Making of steel component A component formed of interstitial free steel is heated in a gaseous atmosphere containing 15% by volume of a nitrogen doner, e.g. ammonia, at about 500° C. to about 740° C. for about 30 minutes to about 4 hours to form an epsilon iron nitride surface l... | 12/01/1987 |
| 4568396 | Wear improvement in titanium alloys by ion implantation A method of making titanium alloy more resistant to sliding wear and fretting fatigue comprising the steps of: implanting carbon ions with at least one energy onto titanium alloy until at least 1×1017 carbon ions/cm2 have fallen onto the... | 02/04/1986 |
| 4455177 | Method and apparatus for chemical heat treatment of steel parts utilizing a continuous electric furnace A continuous electric furnace for chemical heat treatment of steel parts comprises a parts heating chamber, a parts vertical supply chamber and a cooling chamber, all arranged in line. The parts vertical supply chamber is connected to a processing chamber... | 06/19/1984 |
| 4386973 | Vacuum carburizing steel A method of carburizing steel comprising carburizing steel under vacuum utilizing as the carburizing gas an aliphatic alcohol having 1 to 4 carbon atoms, preferably methanol and natural gas additions.... | 06/07/1983 |
| 4326898 | Method for forming material surfaces Material surfaces are provided which maintain their characteristic properties over long periods and which resist degradation by the environment in which they are utilized. The surfaces are formed by exposing a surface of atomically clean material to a gas... | 04/27/1982 |
| 4191598 | Jet recirculation method for vacuum carburizing A method and apparatus for recirculation of atmosphere in a vacuum furnace which comprises a recirculation loop in which there is a low pressure line from the furnace chamber leading to a recirculation pump which pumps the recycled gas at a higher pressur... | 03/04/1980 |
| 4168186 | Method for control of the carburization of parts in a vacuum furnace A method and apparatus for the control of the carburizing of parts under vacuum in a vacuum furnace, with which as a carbon carrier a hydrocarbon gas is introduced controlled in the furance. As the control quantity a soot mist formation is used in such a ... | 09/18/1979 |
| 4160680 | Vacuum carburizing A vacuum furnace is provided with subatmospheric pressure control of a diffusable media and with a fan at an end of a heated load chamber to circulate uniformly the diffusable media around the workpieces which are contained within the load chamber.... | 07/10/1979 |
