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1. 发明专利

JP2002212694A BAKING TREATMENT METHOD FOR TITANIUM ALLOY 失效
公开(公告)号：JP2002212694A
公开(公告)日：2002-07-31
申请号：JP2001004088
申请日：2001-01-11
申请人： TANAKA KK , SDC KK
发明人： TANAKA KOICHI , TANAKA SHINICHI
IPC分类号： C22F1/18 , C22F1/00 , C22F1/02 , C23C8/36
摘要： PROBLEM TO BE SOLVED: To provide a backing treatment method which reduces hydrogen content and avoides lowering of the material quality caused by hydrogen brittleness of a titanium alloy subjected to plasma carburizing treatment after solution heat and aging application. SOLUTION: Hydrogen having entered into the titanium alloy in the carburizing treatment process can be removed by subjecting the titanium alloy which has been subjected to the plasma carburizing treatment after solution heat treating and age hardening to the baking treatment comprising keeping the titanium alloy at a temperature of not lower than 200 deg.C to the lower temperature in the carburizing treatment for 30 min to 10 h. In the case when the treatment conditions mentioned above are selected, lowering of mechanical properties such as fatigue strength caused by hydrogen brittleness can prevented, lowering of the material quality can be avoided, the wear resistance and sliding property are improved by a hardened layer of TiC formed on the surface layer part of the titanium alloy, so that the characteristics required for screw parts or the like used in an aircraft can be satisfied.

2. 发明专利

JP2002088463A METHOD FOR SURFACE TREATMENT OF TITANIUM METAL 审中-公开
公开(公告)号：JP2002088463A
公开(公告)日：2002-03-27
申请号：JP2001210361
申请日：2001-07-11
申请人： OSAKA PREFECTURE , TANAKA KK , SDC KK
发明人： SONE TAKUMI , SATO YUKIHIRO , IZUMI TAKASHI , SUMIYA HIDEO , TANAKA KOICHI , TANAKA SHINICHI , TSUJI NOBUYOSHI , ISHII EIICHI
IPC分类号： C23C8/36 , C23C8/02
摘要： PROBLEM TO BE SOLVED: To provide a method for carburizing treatment by which, in performing carburizing treatment at low temperatures, carbon can be allowed to penetrate with certainty between metallic atoms even at

3. 发明专利

JP2975599B1 失效
公开(公告)号：JP2975599B1
公开(公告)日：1999-11-10
申请号：JP29556498
申请日：1998-10-16
申请人： TANAKA KK
发明人： TANAKA KOICHI , TANAKA SHINICHI , TSUJI NOBUYOSHI
IPC分类号： F16B33/06 , C21D1/06 , C21D9/00 , C23C8/22 , C23C8/38
摘要： Threaded parts for aircraft made of heat-resistant steel which will never seize even after subjected to large temperature fluctuations and vibrations for a long time. Thus they can be tightened sufficiently and also loosened for maintenance and inspection. The threaded parts are made of heat-resistant steel and having its surface subjected to carburizing so as to satisfy the following equations: where X is the depth ( mu m) from the surface of the threaded part and and Y is the Vickers hardness (HV).

4. 发明专利

JP2003129215A PRODUCTION METHOD FOR TITANIUM ALLOY THREAD PART AND TITANIUM ALLOY THREAD PART USING THE SAME 审中-公开
公开(公告)号：JP2003129215A
公开(公告)日：2003-05-08
申请号：JP2001356737
申请日：2001-10-17
申请人： TANAKA KK , SDC KK
发明人： ISHII EIICHI , TANAKA KOICHI , TANAKA SHINICHI
IPC分类号： B21H3/02 , C22C14/00 , C22F1/00 , C22F1/18 , C23C8/36
摘要： PROBLEM TO BE SOLVED: To provide a method for preventing the degradation in fatigue strength, due to surface roughening or hydrogen intrusion, of a titanium alloy part having been subjected to a plasma carburization treatment; and the titanium alloy part using the method. SOLUTION: After the solution treatment and aging treatment of a bolt material of a titanium alloy, the material is subjected to a plasma carburization treatment in an atmospheric gas with a temperature of 350 deg.C-700 deg.C and a pressure of 10-2,000 Pa, then heated at 150 deg.C-350 deg.C in an argon atmosphere, and subjected to thread form rolling. By the tread form rolling after the plasma carburization treatment, such form rolling effects that the work hardening layer at a thread valley bottom wherein fatigue fracture easily occurs is not softened, that the compression stress is not relaxed, and that the roughened surface due to the plasma charburization treatment is smoothened are secured; and the fatigue strength of the titanium alloy thread part is improved.

5. 发明专利

JPH11318520A EXTERIOR PARTS FOR WRISTWATCH MADE OF TITANIUM METAL AND THEIR SURFACE TREATMENT 失效
公开(公告)号：JPH11318520A
公开(公告)日：1999-11-24
申请号：JP15520198
申请日：1998-05-19
申请人： TANAKA KK , SEIKO CO LTD
发明人： TANAKA KOICHI , TANAKA SHINICHI , TSUJI NOBUYOSHI , ARAKI TATSUO
IPC分类号： A44C5/00 , C23C8/20 , C23C8/36 , C23C8/80
摘要： PROBLEM TO BE SOLVED: To provide exterior parts for wristwatches which have the gloss of silver color intrinsic to a titanium metal, substantially prevent the formation of fine rubbing flaws and are capable of maintaining the beauty of the surface gloss for a long period of time. SOLUTION: The surfaces of the exterior parts for wristwatches consisting of the titanium metal are formed of carburized layers of Vickers hardness (HAVING) of >=500 consisting of titanium carbide and carbon solid soln. titanium. These carburized layers are formed on the surfaces having the gloss of the silver color. The carburized layers consisting of the titanium carbide and the carbon solid soln. titanium are, thereupon, formed on the exterior parts for wristwatches by a plasma carburization treatment in an atmosphere of 0.1 to 5 Torr in pressure of gaseous hydrocarbon system and 700 to 900 deg.C and are subjected to mirror polishing.

6. 发明专利

JP2002348647A BAKING METHOD FOR PURE TITANIUM 失效
公开(公告)号：JP2002348647A
公开(公告)日：2002-12-04
申请号：JP2001157201
申请日：2001-05-25
申请人： TANAKA KK , SDC KK
发明人： TANAKA KOICHI , TANAKA SHINICHI
IPC分类号： C22F1/18 , C22F1/00 , C22F1/02
摘要： PROBLEM TO BE SOLVED: To provide a baking method for reducing a hydrogen content in pure titanium carburized with plasma, in order to prevent the degradation of fatigue strength caused by hydrogen embrittlement. SOLUTION: The baking method for pure titanium carburized with plasma is characterized by baking the titanium in a vacuum atmosphere of 15 Pa or less, at 200 deg.C or higher but at a lower limit temperature of plasma carburization treatment or lower, for duration of 30 minutes to ten hours, after plasma carburization treatment, to remove the hydrogen which has invaded in the titanium metal during the carburization treatment. If the treatment condition is suitably selected, the method can prevent degradation of fatigue strength caused by hydrogen embrittlement, improve abrasion resistance and sliding properties due to a quench-hardened layer of TiC formed on the surface of the pure titanium, without causing material deterioration, and satisfy characteristics required for threaded fasteners employed by various industrial equipment in chemical plants or the like.

7. 发明专利

JP2001152316A PLASMA CARBURIZING METHOD 失效
公开(公告)号：JP2001152316A
公开(公告)日：2001-06-05
申请号：JP33986499
申请日：1999-11-30
申请人： TANAKA KK , SDC KK
发明人： TANAKA KOICHI , TANAKA SHINICHI , TSUJI NOBUYOSHI
IPC分类号： C23C8/36
摘要： PROBLEM TO BE SOLVED: To obtain excellent wear resistance, low coefficient of friction, and improved corrosion resistance while maintaining the strength of a base material before carburizing. SOLUTION: In this plasma carburizing method, a titanium metal or a heat resistant steel such as austenitic heat resisting steel is heated to 350 deg.C to

8. 发明专利

JP2001140834A HEAT RESISTING STEEL SCREW PARTS FOR AIRCRAFT 失效
公开(公告)号：JP2001140834A
公开(公告)日：2001-05-22
申请号：JP2000129624
申请日：2000-04-28
申请人： TANAKA KK , SDC KK
发明人： TANAKA KOICHI , TANAKA SHINICHI , TSUJI NOBUYOSHI
IPC分类号： F16B33/06 , C23C8/38
摘要： PROBLEM TO BE SOLVED: To provide heat resisting steel screw parts for an aircraft not causing seizure in a state of usage under a wide temperature change and capable of being easily unscrewed and detached for a maintenance check. SOLUTION: These heat resisting steel screw parts for the aircraft are comprised by applying plasma carburizing at 600 to 700 deg.C on a surface including thread faces of the heat resisting steel screw parts so that a relationship between a depth X from the surface and hardness Y satisfies relationships written below. When an X-axis represents the depth (μm) from the surface and a Y-axis perpendicular to the X-axis represents Vickers hardness (HV), a relationship between an X value and a Y value as shown in a range enclosed by a thick line of figure 1 satisfies the following relationships. 0

9. 发明专利

JP2000120639A SCREW COMPONENT OF HEAT-RESISTANT STEEL FOR AIRCRAFT 失效
公开(公告)号：JP2000120639A
公开(公告)日：2000-04-25
申请号：JP29556498
申请日：1998-10-16
申请人： TANAKA KK
发明人： TANAKA KOICHI , TANAKA SHINICHI , TSUJI NOBUYOSHI
IPC分类号： F16B33/06 , C21D1/06 , C21D9/00 , C23C8/22 , C23C8/38
摘要： PROBLEM TO BE SOLVED: To provide a screw component of heat-resistant steel for aircraft not causing seizure in the service condition over a wide temp. varying range and allowing easy removal by loosening the screw at the time of maintenance and inspection. SOLUTION: This screw component of a heat-resistant steel is subjected to a plasma cementation process to its surface including the thread surfaces at 700-900 deg.C and for 0.5-6 hr, in the relations of depth from the surface, (X) and the hardness (Y), 0 =-10X+600, and y

10. 发明专利

JPH1143770A COATING METHOD FOR TITANIUM METAL WITH VITREOUS CARBON 失效
公开(公告)号：JPH1143770A
公开(公告)日：1999-02-16
申请号：JP12902598
申请日：1998-05-12
申请人： TANAKA KK
发明人： TANAKA KOICHI , TANAKA SHINICHI , TSUJI NOBUYOSHI
IPC分类号： C23C8/16 , C23C8/80 , C23C16/02 , C23C16/26 , C23C16/27 , C23C28/00
摘要： PROBLEM TO BE SOLVED: To form homogeneous vitreous carbon film with a high amorphousness on the surface of titanium metal and to efficiently form this vitreous coating on the surface of the titanium metal as thin film. SOLUTION: The surface of titanium metal 1 is polished by buffing using, as abrasives, emery paper, alumina and a suspension of chromium oxide to form a mirror face 1a, a dense and firm titanium oxide coating layer 2 on the mirror face 1a, and the surface of the titanium oxide coating 2 is subjected to plasma heat treatment in an atmosphere of 0.1 to 30 Torr×400 to 1100 deg.C contg. gaseous hydrocarbon such as methane, ethane, propane or the like to form vitreous carbon coating 3 on the surface of the titanium metal.

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