To provide a silicon nitride sintered compact excellent in mechanical characteristics, fracture toughness in particular, and providing a long product life when processed into a product; and a rolling element and a bearing using the same.SOLUTION: A silicon nitride sintered compact of this invention includes a rare-earth element and aluminum element, in which the rare-earth element is contained 6 wt.% or more and 13 wt.% or less in terms of an oxide relative to the total weight of the silicon nitride sintered compact, and the aluminum element is contained 6 wt.% or more and 13 wt.% or less in terms of an oxide relative to the total weight of the silicon nitride sintered compact. The silicon nitride sintered compact includes an inclusion (I) in a surface layer part which is a region 2 mm or less from the surface of the silicon nitride sintered compact, in which the ratio of the total cross-sectional area of the inclusion (I) to the total cross-sectional area of the surface layer part is 0.05% or higher.SELECTED DRAWING: Figure 1

    【課題】機械的特性、特に破壊靱性が良好であり、製品に加工した場合に良好な製品寿命を有する窒化ケイ素焼結体、それを用いた転動体、および軸受を提供する。【解決手段】窒化ケイ素焼結体は、希土類元素およびアルミニウム元素を含み、希土類元素の含有量は、窒化ケイ素焼結体の総重量に対して、酸化物換算で6重量%以上13重量%以下であり、アルミニウム元素の含有量は、窒化ケイ素焼結体の総重量に対して、酸化物換算で6重量%以上13重量%以下であり、窒化ケイ素焼結体の表面から2mm以内の領域である表層部に介在物(I)を有し、表層部の総断面積に対する介在物(I)の総断面積の割合は0.05%以上である。【選択図】図1


    Access

    Download


    Export, share and cite



    Title :

    SILICON NITRIDE SINTERED COMPACT, AND ROLLING ELEMENT AND BEARING USING THE SAME


    Additional title:

    窒化ケイ素焼結体、それを用いた転動体、および軸受


    Contributors:

    Publication date :

    2022-03-15


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    C04B Kalk , LIME / B64C AEROPLANES , Flugzeuge / B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT / F16C SHAFTS , Wellen



    SILICON NITRIDE SINTERED BODY, ROLLING BODY USING SAME, AND BEARING

    NAKAMURA FUMIYA / HAYAKAWA YASUTAKE | European Patent Office | 2023

    Free access

    SILICON NITRIDE SINTERED BODY, ROLLING BODY USING SAME, AND BEARING

    NAKAMURA FUMIYA / HAYAKAWA YASUTAKE | European Patent Office | 2022

    Free access

    Sintered silicon nitride body, and rolling body and bearing using same

    NAKAMURA FUMIYA / HAYAKAWA YASUTAKE | European Patent Office | 2023

    Free access

    Sintered Silicon Nitride Turbocharger Rotor

    Oda, Isao / Kaneno, Msayuki | SAE Technical Papers | 1984


    Sintered Silicon Nitride Turbocharger Rotor

    Kaneno,M. / Oda,I. / NGK Insulators,JP | Automotive engineering | 1984