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公开(公告)号：DE69418423T2
公开(公告)日：1999-12-23
申请号：DE69418423
申请日：1994-02-28
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： NISHIOKA TAKAO , YAMAMOTO TAKEHISA , ITO YASUSHI , YAMAKAWA AKIRA
Abstract: A grind-machining method of ceramic materials characterized in that a peripheral speed of a grinding wheel relative to a working surface is set to 50 to 300 m/sec, a feed stroke speed of the working surface of the grinding wheel in a working direction is set to 50 to 200 m/min, and preferably, a down-feed speed (V3) of the working surface of the grinding wheel in a direction orthogonal to the surface of the workpiece is set to 0.05 to 3 mm/min. The grind-machining method of ceramic materials can reduce a grinding force at the time of grinding of ceramic materials and residual defects due to machining, and at the same time, can accomplish high machining efficiency.
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公开(公告)号：DE69510007T2
公开(公告)日：1999-09-23
申请号：DE69510007
申请日：1995-11-13
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： YAMAKAWA AKIRA , TAKEUCHI HISAO , NISHIOKA TAKAO , YAMAGIWA MASAMICHI
Abstract: A sliding part has a sliding part body, a first member made of ceramics, and a second member of a metal subjected to hardening treatment. In a production method, the first member is joined to a sliding part body by heating at a temperature of 650 DEG C or higher, and the second member made of a metal is attached to the body at a temperature lower than 650 DEG C by means which does not impair an effect of the hardening treatment. The second member has an HRC hardness of 45 or higher.
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公开(公告)号：DE69418423D1
公开(公告)日：1999-06-17
申请号：DE69418423
申请日：1994-02-28
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： NISHIOKA TAKAO , YAMAMOTO TAKEHISA , ITO YASUSHI , YAMAKAWA AKIRA
Abstract: A grind-machining method of ceramic materials characterized in that a peripheral speed of a grinding wheel relative to a working surface is set to 50 to 300 m/sec, a feed stroke speed of the working surface of the grinding wheel in a working direction is set to 50 to 200 m/min, and preferably, a down-feed speed (V3) of the working surface of the grinding wheel in a direction orthogonal to the surface of the workpiece is set to 0.05 to 3 mm/min. The grind-machining method of ceramic materials can reduce a grinding force at the time of grinding of ceramic materials and residual defects due to machining, and at the same time, can accomplish high machining efficiency.
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公开(公告)号：DE69501638T2
公开(公告)日：1998-07-23
申请号：DE69501638
申请日：1995-04-24
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： ITO YASUSHI , YAMAMOTO TAKEHISA , NISHIOKA TAKAO , YAMAKAWA AKIRA , KOMURA OSAMU
IPC: C04B41/80 , B24B1/00 , C04B35/584 , C04B35/593 , C04B35/599 , C04B35/63 , C04B41/00 , C04B41/87 , C04B41/45
Abstract: A method of producing a silicon nitride ceramic component, comprising: grinding a silicon nitride sintered body comprising alpha -Si3N4 having an average grain size of 0.5 mu m or smaller and beta '-sialon having an average grain size of 3 mu m or smaller in major axis and 1 mu m or smaller in minor axis into a predetermined size with a surface roughness of 1-7 mu m in ten-point mean roughness; heat treating the same at temperature range of 800-1200 DEG C in the air; and standing it to allow to be cooled, whereby providing a residual stress in the ground surface before and after the heat treating as a residual compressive stress at a ratio of 1 or higher of the residual compressive stress after the heat treating to that before the heat treating (residual compressive stress after the heat treating/residual compressive stress before the heat treating), preferably 5 or more.
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公开(公告)号：DE69600105T2
公开(公告)日：1998-04-09
申请号：DE69600105
申请日：1996-05-07
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： MATSUURA TAKASHI , NISHIOKA TAKAO , YAMAKAWA AKIRA
IPC: C04B35/584 , C04B35/593 , C04B35/64 , C04B35/587
Abstract: The invention aims to offer a method to manufacture a high-strength, high-reliability and low cost silicon nitride based sintered body which is not affected by the amount of metal impurities contained in the silicon nitride powder, without using high-purity silicon nitride powder, and can be sintered for a short sintering time. The invention uses silicon nitride and sintering aids, and the powder mixture containing 500 - 5000 ppm metal impurities is sintered at temperatures ranging from 1300 - 1900 DEG CÄdegrees CÜ, and under the conditions wherein the product of sintering temperature and sintering time ranges from 1 x 10 to 10x 10 DEG C Ädegrees CÜ.seconds.
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Patent Agency Ranking
公开(公告)号：DE69600105D1
公开(公告)日：1998-01-02
申请号：DE69600105
申请日：1996-05-07
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： MATSUURA TAKASHI , NISHIOKA TAKAO , YAMAKAWA AKIRA
IPC: C04B35/584 , C04B35/593 , C04B35/64 , C04B35/587
Abstract: The invention aims to offer a method to manufacture a high-strength, high-reliability and low cost silicon nitride based sintered body which is not affected by the amount of metal impurities contained in the silicon nitride powder, without using high-purity silicon nitride powder, and can be sintered for a short sintering time. The invention uses silicon nitride and sintering aids, and the powder mixture containing 500 - 5000 ppm metal impurities is sintered at temperatures ranging from 1300 - 1900 DEG CÄdegrees CÜ, and under the conditions wherein the product of sintering temperature and sintering time ranges from 1 x 10 to 10x 10 DEG C Ädegrees CÜ.seconds.
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公开(公告)号：DE69217454D1
公开(公告)日：1997-03-27
申请号：DE69217454
申请日：1992-09-08
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： YAMAMOTO TAKEHISA , NISHIOKA TAKAO , AWAZU TOMOYUKI , YAMAKAWA AKIRA
IPC: C04B35/584 , C04B35/593 , C04B35/597
Abstract: A silicon nitride sintered body comprising alpha -silicon nitride including alpha '-sialon and beta '-sialon including beta -silicon nitride in which the content of the alpha -silicon nitride including alpha '-sialon in the surface part thereof is less than its content in the inner part thereof. The silicon nitride sintered body is excellent in mechanical strength at ordinary temperature, productivity and cost efficiency.
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公开(公告)号：DE69205742T2
公开(公告)日：1996-07-04
申请号：DE69205742
申请日：1992-07-16
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： MATSUNUMA KENJI , NISHIOKA TAKAO , YAMAKAWA AKIRA
IPC: C04B35/584 , F01L1/14 , F01L1/16 , F01L1/20
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公开(公告)号：CA2078169A1
公开(公告)日：1993-05-26
申请号：CA2078169
申请日：1992-09-14
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： YAMAMOTO TAKEHISA , NISHIOKA TAKAO , AWAZU TOMOYUKI , YAMAKAWA AKIRA
IPC: C04B35/584 , C04B35/593 , C04B35/597
Abstract: A silicon nitride sintered body comprising alpha -silicon nitride including alpha '-sialon and beta '-sialon including beta -silicon nitride in which the content of the alpha -silicon nitride including alpha '-sialon in the surface part thereof is less than its content in the inner part thereof. The silicon nitride sintered body is excellent in mechanical strength at ordinary temperature, productivity and cost efficiency.
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公开(公告)号：CA2060241A1
公开(公告)日：1992-11-23
申请号：CA2060241
申请日：1992-01-29
Applicant: SUMITOMO ELECTRIC INDUSTRIES
Inventor： YAMAMOTO TAKEHISA , NISHIOKA TAKAO , MATSUNUMA KENJI , YAMAKAWA AKIRA , MIYAKE MASAYA
IPC: C04B35/593 , C04B35/597 , C04B35/58
Abstract: The present invention relates to a silicon nitride sintered body [wherein the composition of Si3N4-first aid (Y2O3 + MgO)-second aid (at least one of Al2O3 and AlN)] falls within a range defined by lines joining points A, B, C and D in FIG. 1, the crystal phase of the sintered body contains both alpha -Si3N4 and beta '-sialon, and the relative density is 98% or more. This sintered body is produced by subjecting a green compact of the above-described source to primary sintering in a nitrogen gas atmosphere at 1300 to 1700 DEG C so that the relative density reaches 96% or more, and the precipitation ratio of the alpha -Si3N4 crystal phases to the beta '-sialon crystal phase in the sintered body is in the range of from 40 : 60 to 80 : 20; and then subjecting the primary sintered body to secondary sintering in a nitrogen gas atmosphere at 1300 to 1700 DEG C so that the relative density reaches 98% or more. The sintered body has superior strength properties, especially at ordinary temperatures, and can be produced with a high productivity in a high yield at a low cost.
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