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Sintered silicon nitride body, and rolling body and bearing using same
Provided are: a silicon nitride sintered body which has good mechanical properties, particularly good fracture toughness, and which has a good product life when processed into a product; a rolling body which uses the silicon nitride sintered body; and a bearing. The silicon nitride sintered body contains a rare earth element and an aluminum element, the content of the rare earth element is 6-13 wt% in terms of oxide relative to the total weight of the silicon nitride sintered body, and the content of the aluminum element is 6-13 wt% in terms of oxide relative to the total weight of the silicon nitride sintered body. The silicon nitride sintered body has inclusions (I) in a surface layer part, which is a region within 2 mm from the surface of the silicon nitride sintered body, and the ratio of the total cross-sectional area of the inclusions (I) to the total cross-sectional area of the surface layer part is 0.05% or more.
本发明提供机械特性、特别是断裂韧性良好、加工成产品时具有良好的产品寿命的氮化硅烧结体、使用有其的滚动体、以及轴承。氮化硅烧结体含有稀土元素和铝元素，稀土元素的含量相对于氮化硅烧结体的总重量，以氧化物换算计，为6重量％以上且13重量％以下，铝元素的含量相对于氮化硅烧结体的总重量，以氧化物换算计，为6重量％以上且13重量％以下，在氮化硅烧结体的距表面2mm以内的区域即表层部具有夹杂物(I)，夹杂物(I)的总截面积相对于表层部的总截面积的比例为0.05％以上。
Sintered silicon nitride body, and rolling body and bearing using same
Provided are: a silicon nitride sintered body which has good mechanical properties, particularly good fracture toughness, and which has a good product life when processed into a product; a rolling body which uses the silicon nitride sintered body; and a bearing. The silicon nitride sintered body contains a rare earth element and an aluminum element, the content of the rare earth element is 6-13 wt% in terms of oxide relative to the total weight of the silicon nitride sintered body, and the content of the aluminum element is 6-13 wt% in terms of oxide relative to the total weight of the silicon nitride sintered body. The silicon nitride sintered body has inclusions (I) in a surface layer part, which is a region within 2 mm from the surface of the silicon nitride sintered body, and the ratio of the total cross-sectional area of the inclusions (I) to the total cross-sectional area of the surface layer part is 0.05% or more.
本发明提供机械特性、特别是断裂韧性良好、加工成产品时具有良好的产品寿命的氮化硅烧结体、使用有其的滚动体、以及轴承。氮化硅烧结体含有稀土元素和铝元素，稀土元素的含量相对于氮化硅烧结体的总重量，以氧化物换算计，为6重量％以上且13重量％以下，铝元素的含量相对于氮化硅烧结体的总重量，以氧化物换算计，为6重量％以上且13重量％以下，在氮化硅烧结体的距表面2mm以内的区域即表层部具有夹杂物(I)，夹杂物(I)的总截面积相对于表层部的总截面积的比例为0.05％以上。
Sintered silicon nitride body, and rolling body and bearing using same
氮化硅烧结体、使用其的滚动体和轴承
NAKAMURA FUMIYA (author) / HAYAKAWA YASUTAKE (author)
2023-04-04
Patent
Electronic Resource
Chinese
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