| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 148223000 | Including use of vacuum | 13 |
| 20080216922 | 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 temperature history from the first temperature to a predetermined temperature satisfies a predetermined condition; an after-normalizing maintaining process of maintaining the temperature of the whole workpiece for a predetermined time after the normalizing process so that the whole workpiece becomes the predetermined temperature, thereby producing fine crystal grains in the workpiece; and a reheating process of raising the temperature of the workpiece to the second temperature, after the after-normalizing keeping process. According to the invention, even when a process temperature is set high to make rapid progress of carburization and diffusion and thus the process time is shortened, uniformity in temperature is achieved between a surface and a inside of a workpiece by the high-temperature process and crystal grains are prevented from being coarse, thereby obtaining a workpiece having a predetermined property value. | 09-11-2008 |
| 20080230153 | METHOD FOR PRODUCING CARBURIZED PARTS - A method for producing a carburized part by carburizing a steel member under a vacuum in a decompression furnace while feeding carburizing gas comprises a step for forming an oxide film on at least a part of a surface of the steel member, a step for generating carbon by reducing the oxide film with the carburizing gas, and a step for carburizing the surface of the steel member under a vacuum by diffusing the carbon. | 09-25-2008 |
| 20080257455 | 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 to give medical titanium alloy femoral head in total hip arthroplasty with TiC ceramic on surface thereof. The TiC ceramic layer on femoral head can be more than 100 micron thick, which is relatively thick, overcomes the disadvantages in available medical titanium alloy material, and is particularly useful for replacement of total hip or knee arthroplasty. | 10-23-2008 |
| 20100084051 | 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 slow cooling by air cooling at such a cooling rate that causes pearlite transformation, to transform a surface structure into pearlite; and thereafter, performing induction hardening under such heating and cooling conditions that produce fine carbides in a range of up to 0.1 mm from a surface by finely dividing cementite in the pearlite structure, where the fine carbides contain 90% or more of carbides of 1 μm or less. | 04-08-2010 |
| 20120018052 | Novel Stainless Steel Carburization Process - The present invention is directed to a process for tempering steel comprising carburizing said steel in a vacuum furnace in the presence of a hydrocarbon carburizing gas in combination with hydrogen wherein said carburizing gas/hydrogen combination is administered to the vacuum furnace by cyclically reducing the pressure in the furnace followed by the pulsed addition of the hydrocarbon carburizing gas consisting of an acetylene/hydrogen mixture is in a ratio of from about 1:1 to about 1:10 to replenish the air removed in the pressure reduction step. | 01-26-2012 |
| 20120067462 | METHOD FOR CARBURIZING TANTALUM MEMBER, AND TANTALUM MEMBER - Provided is a method for carburizing a tantalum member whereby the tantalum member is less deformed by carburization and can be carburized with good flatness of the planar part thereof and in a uniform manner. The method is a method for subjecting a tantalum member | 03-22-2012 |
| 20130186520 | CONCURRENT FLOW OF ACTIVATING GAS IN LOW TEMPERATURE CARBURIZATION - Low temperature gas carburization of stainless steel using acetylene as the carburizing specie is carried out under soft vacuum conditions in the presence of hydrogen or other companion gas. Carburization is made to go faster by including HCl or other carbon-free, halogen-containing activating compound in the carburizing gas being fed to the carburization reactor. | 07-25-2013 |
| 20130292007 | High Temperature Nitriding of Titanium Parts - A method and apparatus for manufacturing a part. The part may be positioned in a chamber. The part may be comprised of a metal and may be a positioned part. A gas containing nitrogen may be sent into the chamber. An electromagnetic field may be generated in the chamber with the gas. The electromagnetic field may heat a portion of the metal in the positioned part to a temperature from about 60 percent to about 99 percent of the melting point of the metal such that the portion of the metal has a desired hardness. The portion of the metal may extend from a surface of the positioned part to a selected depth from the surface. | 11-07-2013 |
| 20150013848 | Method for Manufacturing A Torque Transmission Mechanism - A method for manufacturing a torque transmission mechanism between a starter motor and a crankshaft of an internal combustion engine, comprising a one-way clutch including an outer ring fast in rotation with the crankshaft via a front plate. This method comprises the following steps: a) forging the outer ring out of carburizing steel, b) carburizing the outer ring, c) tempering the outer ring, d) grinding an inner surface of the outer ring, e) manufacturing the front plate out of standard low equivalent carbon content steel, and f) assembling the front plate and the outer ring. | 01-15-2015 |
| 20160047020 | A Bearing Steel Composition - A bearing steel composition comprising:
| 02-18-2016 |
| 20160108490 | GEAR AND METHOD FOR MANUFACTURING THE SAME - A gear that is formed of material steel molded to include a disc portion and a plurality of tooth portions circumferentially discretely formed on the disc portion and have a shape in which tooth root portions are formed between the tooth portions, and is subjected to vacuum carburizing treatment and subsequent quenching treatment with high-density energy heating after being molded. | 04-21-2016 |
| 20160160306 | COIL SPRING, AND METHOD FOR MANUFACTURING SAME - To provide a coil spring having excellent fatigue resistance. | 06-09-2016 |
| 20160376692 | PROCESS FOR TREATING A PIECE OF TANTALUM OR OF A TANTALUM ALLOY - A process for treating a piece of tantalum or of a tantalum alloy, which consists in: placing the piece in a furnace and heating the furnace under vacuum at least at 1 400° C.; forming a carbon multilayer in the peripheral part of the piece, by injecting, in the heated furnace, a gas carbon source at a pressure ≦10 mbar, the multilayer comprising at least one layer C | 12-29-2016 |
