Structure and property of Ni-W-B alloy electrodeposits before and after heat treatment
Full Text
Date
2001Author
Cao, GM
曹刚敏
Yang, FZ
杨防祖
Huang, L
黄令
Niu, ZJ
牛振江
Xu, SK
许书楷
Zhou, SM
周绍民
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- 化学化工-已发表论文 [14469]
Abstract
The structure and microhardness of Ni-W-B alloy were studied by means of electrochemical techniques, XPS, DSC and XRD before and after heat treatment. The results showed that the process of Ni-W-B alloy electrodeposition was accompanied by the chemical deposition of Ni and adulteration of Na2B4O7 in the deposit. Ni-W alloy presented in nanocrystalline structure and Ni-W-B in amorphous structure were both coarsened in grain size and led to the evolution of Ni4W, and precipitation of Ni - B compound such as Ni2B, Ni3B in Ni-W-B alloy after heat treatment, The maximum microhardness could be observed for Ni-W alloy at the value of 919.8 kg . mm(-2) after heat treatment for 2 hours at temperature of 400 degreesC and Ni-W-B alloy at 1132.2 kg . mm(-2) (500 degreesC, 2 hrs).