Sliding member, and bearing, motor, and drive device using the same
AssigneesKabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
InventorsKai Funaki, Katsuyuki Aoki, Haruhiko Yamaguti, Minoru Takao, Yutaka Abe
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Abstract
The sliding member according to the embodiment includes a silicon nitride sintered body that includes silicon nitride crystal grains and a grain boundary phase, in which a percentage of a number of the silicon nitride crystal grains including dislocation defect portions inside the silicon nitride crystal grains among any 50 of the silicon nitride crystal grains having completely visible contours in a 50 μm×50 μm observation region of any cross section or surface of the silicon nitride sintered body is not less than 0% and not more than 10%. The percentage is more preferably not less than 0% and not more than 3%.
Claims16
A sliding member, comprising:
- a silicon nitride sintered body including silicon nitride crystal grains and a grain boundary phase among the silicon nitride crystal grains,
- a percentage of a number of the silicon nitride crystal grains including dislocation defect portions inside the silicon nitride crystal grains among any 50 of the silicon nitride crystal grains having completely visible contours in a 50 μm×50 μm observation region of any cross section or surface of the silicon nitride sintered body being not less than 0% and not more than 10%,
- wherein a percentage of a number of the silicon nitride crystal grains having an occupied area ratio of the dislocation defect portion that is not more than 5% among the number of the silicon nitride crystal grains including dislocation defect portions is not less than 70%.
Dependencies are inferred from the claim text.