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溶体与非晶态的混合组织。热处理后硬度高达 HV1 30 0。该镀层组织在不同热处理温度下 ,以 350℃为分界点 ,组织转变过程有很大差异 ,并发现转变过程中有 Ni2 B出现。应力释放、B的脱溶及 Ni2 B和 Ni3B的形成是影响镀层硬度的几个关键因素 ,尤其是 Ni2 B显对镀层硬度 -时间曲线的变化规律的影响显著。不同热处理温度下 ,硬度的峰值出现时间不同 ,有随热处理温度升高向时间缩短方向移动的趋势 ;热处理温度愈趋近 Ni- B合金的晶化温度 ,硬度随时间的变化过程愈复杂。
WT5BZ]A Ni B coating is prepared by EP with potassium borohydride reducing agent The as plating microstructure of coating is confirmed to be a mixture of amorphous and supersaturated solid solution with XRD analysis The micro hardness is up to HV1300 after heat treatment The transformation process of the coating microstructure depends on heat treatment temperature, and 350℃ is the critical temperature of microstructure transformation It is found that Ni 2B is formed during this transformation process The factors which influence on hardness of coating are evolution of stress, dissolution of B and formation of Ni 3B and Ni 2B And the formation of Ni 2B is the key factor The peaks of micro hardness curves vary with heat treatment temperatures, and tend to shorten heat treatment time with higher temperature The transformation process becomes more complex when the heat treatment temperature accesses crystallizing temperature
出处
《材料工程》
EI
CAS
CSCD
北大核心
2000年第6期30-33,共4页
Journal of Materials Engineering
关键词
镍硼合金
化学镀
热处理
组织转变
性能
Ni B
alloy Coating
Electroless
heat treatment
Ni 2B
Ni 3B
