| 摘要 |
PURPOSE:To improve the wear resistance at the sliding surfaces of both members mentioned below and the strength of a primary member, by constituting, in two members mutually abutting and relatively sliding, a primary member of a specific composite material and also constituting the sliding surface part of a secondary member of a nitrided steel and by specifying the hardnesses in the sliding surface parts of both members, respectively. CONSTITUTION:The hardness at least at the sliding surface part of a primary member to a secondary member is regulated to >=7 by Moh's hardness. The primary member is constituted of a composite material in which a mixture of 3-45%, by volume, of fiber reinforcement of <=20mu diameter and 3-50%, by volume of potassium titanate whisker is used as reinforcement and metals such as Al, Mg, copper, etc., are used as matrix metal. On the other hand, at least the sliding surface part of the secondary member to the primary member is constituted of a nitrided steel of >=550 Hv(50g) hardness.
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