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最近的汽车产业应用,要求具有高表观硬度、高淬透性及高力学性能的粉末冶金零件材料。这些要求往往是相互矛盾的,因此需要开发烧结态具有高表观硬度、良好静态动态力学性能又不会增加后续热处理费用的新材料。传统上,烧结硬化材料具有适用的表观硬度,但力学性能与烧结体密度差。这里将用资料证明具有良好压缩性,高表观硬度及提高力学性能的一系列烧结硬化材料的力学性能。集中讨论这些材料在汽车发动机与变速器中的应用,诸如齿轮、凸轮及链轮等,这些零件目前都是由压制-烧结及热处理工艺或由铸件或锻造材料用常规切削加工生产的。也将讨论用高温烧结来增强其工艺过程。
Recent automotive applications require powder metallurgy parts with high apparent hardness, high hardenability and high mechanical properties. These requirements are often conflicting and there is a need to develop new materials that have a high apparent hardness in the sintered state, good static dynamic mechanical properties, and do not increase the cost of subsequent heat treatment. Traditionally, sintered hardened materials have a suitable apparent hardness, but poor mechanical properties and sintered density. Materials here will demonstrate the mechanical properties of a range of sintered hardened materials with good compressibility, high apparent hardness and improved mechanical properties. They focus on applications of these materials in automotive engines and transmissions, such as gears, cams and sprockets, which are currently produced by press-sinter and heat treatment processes or by conventional machining of castings or forged materials. High temperature sintering will also be discussed to enhance the process.