热处理对高硬度Ni—B涂层的影响及其时效机制

Effect of Heat-Treatment on Microstructure and property of Electroless Ni-B Coating and Ageing Mechanism

摘要:

通过化学镀方法制备了高硬度Ni-B合金涂层，经XRD分析确认镀态镀层组织为过饱和固容体与非晶态的混合组织，详细探讨了涂层经不同温度热处理的组织转变及性能变化规律，并发现涂层组织经较高温度的热处理后有Ni2B出现，此外还观察到组织在室温下有不同程度的时效现象发生，分析了时效变化机理，其主要原因与Ni2B出现密切相关，组织中是否有Ni2B出现，数量的多少及Ni2B向Ni3B的转变方式直接影响着涂层的时效剧烈程度。

Abstract:

A Ni B coating was prepared using chemical plating. XRD analysis shows that the microstructure of as coating is a mixture of amorphous and supersaturated solid solution. The microstructural transformation and properties of the coating for different heat treatment conditions are discussed in details. Ni 2B formed during high temperature ageing. Room temperature ageing was also observed. The age hardenability depends on existence and quantity of Ni 2B, and the transformation mode from Ni 2B to Ni 3B.