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    Silicon Nitride Ceramic Sliding Member and Process for Producing the Same
    32.
    发明专利
    Silicon Nitride Ceramic Sliding Member and Process for Producing the Same 未知

    公开(公告)号：CA2169862A1

    公开(公告)日：1996-08-21

    申请号：CA2169862

    申请日：1996-02-20

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： YAMAGIWA MASAMICHI ,  YAMAKAWA AKIRA ,  NISHIOKA TAKAO ,  MATSUURA TAKASHI

    IPC: F16C33/24 ,  C04B35/584 ,  C04B35/593 ,  C04B41/80 ,  F01L1/14 ,  F01L3/02 ,  F16C33/04

    Abstract: A silicon nitride ceramic sliding member which comprises Si3N4 grains as a main component and is shaped or controlled in dimensions through hot plastic working wherein the Si3N4 particles mainly comprises .beta.-type columnar crystal grains. The ceramic sliding member is produced by the step (I) of preparing a preform made of silicon nitride ceramic sintered body comprising Si3N4 grains as a main component wherein the average grain size (average grain size in minor axis in the case of .beta.-type columnar crystal grains) of the Si3N4 grains is at most 0.5 .mu.m, and the hot plastic working step (II) of placing the preform in a mold and effecting hot plastic deformation of the preform for shaping or dimensional control thereof while simultaneously increasing the average aspect ratio of the .beta.-type columnar crystal grains. The resultant sliding member has excellent sliding properties, a high mechanical strength and a high reliability at a low cost without resort to grinding or the like for shaping thereof.

    SILICON NITRIDE SINTERED BODY AND PROCESS FOR PRODUCING THE SAME
    33.
    发明专利
    SILICON NITRIDE SINTERED BODY AND PROCESS FOR PRODUCING THE SAME 未知

    公开(公告)号：CA2060241C

    公开(公告)日：1996-08-20

    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 B'-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.degree.C so that the relative density reaches 96% or more, and the precipitation ratio of the a-Si3N4 crystal phases to the B'-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.degree.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.

    Adjusting Shim
    35.
    发明专利
    Adjusting Shim 未知

    公开(公告)号：CA2073649A1

    公开(公告)日：1994-01-11

    申请号：CA2073649

    申请日：1992-07-10

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： MATSUNUMA KENJI ,  NISHIOKA TAKAO ,  YAMAMOTO TAKEHISA ,  YAMAKAWA AKIRA

    IPC: C04B35/584 ,  C04B35/593 ,  C04B35/597 ,  C04B35/599 ,  C04B38/00 ,  F01L1/14 ,  F01L1/16 ,  F01L1/20 ,  F01L31/24

    Abstract: The present invention provides an improved adjusting shim used in a valve train for an internal combustion engine for an automobile. The adjusting shim produced from a base material consisting of a ceramic material containing 80 to 98 wt. % of silicon nitride and/or sialon and has a porosity of not more than 3%, a bending strength of not less than 1.0 GPa and an impact compressive elastic limit (Hugoniot elastic limit) of not less than 15 GPa, wherein the base material is provided on the surface thereof which contacts a cam with a ceramic surface layer having a composition different from that of the base material and a hardness lower than that of the base material. The adjusting shim of the present invention enables a power loss of a valve train to be minimized; the abrasion resistance thereof to be improved; and the fuel economy, the performance and durability of an internal combustion engine to be improved.

    METHOD OF MACHINING SILICON NITRIDE CERAMICS AND SILICON NITRIDE CERAMICS PRODUCTS
    36.
    发明专利
    METHOD OF MACHINING SILICON NITRIDE CERAMICS AND SILICON NITRIDE CERAMICS PRODUCTS 未知

    公开(公告)号：CA2073388A1

    公开(公告)日：1993-11-02

    申请号：CA2073388

    申请日：1992-07-08

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： NISHIOKA TAKAO ,  MATSUNUMA KENJI ,  YAMAKAWA AKIRA

    IPC: B24B1/00 ,  B24B7/22 ,  B24B19/22 ,  B24D3/00 ,  C04B35/584 ,  B28B11/08

    Abstract: An industrially feasible method of grinding silicon nitride ceramics. The method provides a sufficiently smooth surface. Namely, the surface has a maximum height-roughness Rmax of 0.1 micron or less and a ten-point mean roughtness Rz of 0.05 micron. Further, with this method, surface damage can be repaired while grinding. The vertical cutting speed of a grinding wheel into a work should be within the range of 0.005 - 0.1 micron for each rotation of the working surface of the wheel and change linearly or stepwise. The horizontal machining speed should be within the range of 25 to 75 m/sec. With this arrangement, the contact pressure and grinding heat that generate between the work and the hard abrasive grains during grinding are combined. In other words, mechanical and thermal actions are combined.

    38.
    发明专利
    未知

    公开(公告)号：DE69925784T2

    公开(公告)日：2006-05-18

    申请号：DE69925784

    申请日：1999-04-22

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： NISHIOKA TAKAO ,  MOCHIDA YASUSHI

    IPC: F02M59/02 ,  F02M59/44 ,  F04B39/00 ,  F04B53/02 ,  F04B53/14 ,  F04B53/16

    Abstract: A fuel injection pump for high pressure injecting gasoline, fuel whose main component is gasoline or light oil having a sulfur content of 0.05% by weight or less by a reciprocation of a piston sliding relative to a cylinder, wherein at least a sliding surface of the piston to slide on the cylinder is made of ceramic and the surface roughness thereof, expressed in ten-point mean surface roughness Rz, is 0.05-0.4 mu m in a direction perpendicular to the sliding direction and 0.2-0.6 mu m in a direction parallel to the sliding direction while the surface roughness expressed in the ten-point mean surface roughness Rz of a cylinder sliding surface corresponding thereto is 0.2-0.8 mu m in a direction parallel to the sliding direction. By using the above combination of piston and cylinder, the wear resistance of the piston and cylinder is improved, the durability thereof is improved and the production cost can be largely reduced.

    39.
    发明专利
    未知

    公开(公告)号：DE69525834D1

    公开(公告)日：2002-04-18

    申请号：DE69525834

    申请日：1995-10-04

    Applicant: NAT INST OF ADVANCED IND SCIEN ,  SUMITOMO ELECTRIC INDUSTRIES

    Inventor： KONDOH NAOKI ,  WAKAI FUMIHIRO ,  OBATA YOSHIHIRO ,  YAMAKAWA AKIRA ,  NISHIOKA TAKAO ,  YOSHIMURA MASASHI

    IPC: B28B1/00 ,  C04B35/584 ,  C04B35/593 ,  C04B35/597 ,  C04B35/599 ,  C04B35/626

    Abstract: There are provided a process for forming a silicon nitride sintered body, encompassing a sialon sintered body, by making much of the superplasticity of the sintered body intact as a simple material without formation thereof into a composite material, and a formed sintered body produced by the foregoing process. A silicon nitride sintered body (encompassing a sialon sintered body) having a relative density of at least 95% and a linear density of 120 to 250 in terms of the number of grains per 50 mu m in length in a two-dimensional cross section of the sintered body is formed through plastic deformation thereof at a strain rate of at most 10 /sec under a tensile or compressive pressure at a temperature of 1,300 to 1,700 DEG C. The formed sintered body has a degree of orientation of 5 to 80% as examined according to a method specified by Saltykov, a linear density of 80 to 200, and excellent mechanical properties especially at ordinary temperatures.

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