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A platform for research: civil engineering, architecture and urbanism
SILICON NITRIDE SINTERED BODY, ROLLING BODY USING THE SAME, AND BEARING
To provide: a silicon nitride sintered body that has good mechanical properties, in particular fracture toughness, and has good product life when processed into a product; a rolling body using the same; and a bearing.SOLUTION: A silicon nitride sintered body includes a rare earth element and an aluminum element. A surface section, being a region within 2 mm of the surface of the silicon nitride sintered body, includes inclusions (I) and the total cross-sectional area ratio of the inclusions (I) relative to the total cross-sectional area of the surface section is 0.05% or more. The inclusion (I) includes an inclusion (It) containing a transition metal element. The inclusion (It) is a silicide of the transition metal element.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、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）の総断面積の割合が０．０５％以上であり、介在物（Ｉ）が、遷移金属元素を含む介在物（Ｉｔ）を含み、介在物（Ｉｔ）が遷移金属元素のケイ化物である。【選択図】図１
SILICON NITRIDE SINTERED BODY, ROLLING BODY USING THE SAME, AND BEARING
To provide: a silicon nitride sintered body that has good mechanical properties, in particular fracture toughness, and has good product life when processed into a product; a rolling body using the same; and a bearing.SOLUTION: A silicon nitride sintered body includes a rare earth element and an aluminum element. A surface section, being a region within 2 mm of the surface of the silicon nitride sintered body, includes inclusions (I) and the total cross-sectional area ratio of the inclusions (I) relative to the total cross-sectional area of the surface section is 0.05% or more. The inclusion (I) includes an inclusion (It) containing a transition metal element. The inclusion (It) is a silicide of the transition metal element.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、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）の総断面積の割合が０．０５％以上であり、介在物（Ｉ）が、遷移金属元素を含む介在物（Ｉｔ）を含み、介在物（Ｉｔ）が遷移金属元素のケイ化物である。【選択図】図１
SILICON NITRIDE SINTERED BODY, ROLLING BODY USING THE SAME, AND BEARING
窒化ケイ素焼結体、それを用いた転動体、および軸受
YAGI FUMIYA (author) / HAYAKAWA YASUTAKE (author)
2023-09-20
Patent
Electronic Resource
Japanese
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