Fabrication of a nitrided coating on a novel Ni-Cr nanocomposite with increased surface hardness
Fabrication of a nitrided coating on a novel Ni-Cr nanocomposite with increased surface hardness
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DOI：
10.1016/j.materresbull.2009.12.015
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发表时间：
2010-04
影响因子：
5.4
通讯作者：
Jiazheng Zhao;X. Peng;Fu-Xin Wang
中科院分区：
文献类型：
--
作者：
Jiazheng Zhao;X. Peng;Fu-Xin Wang
采用电沉积法制备了一种以纳米晶Ni为基体、纳米Cr颗粒为分散相的Ni-Cr纳米复合材料。在560°C下等离子渗氮10 h后，纳米复合材料表面形成了一层硬涂层，其中Cr纳米颗粒内部转化为CrN。随着Cr含量从10.8增加到30（wt.%），涂层厚度减小，但硬度增加。此外，Cr含量的增加引起的氮化涂层的最硬的区域从最里面的最高表面的移位，作为在复合材料的氮化机制从内部到外部的变化的结果。
A novel type of Ni–Cr nanocomposite that had a nanocrystalline Ni matrix dispersing Cr nanoparticles was developed by electrodeposition. During plasma nitriding at 560°C for 10h, the nanocomposite formed a surface hard coating in which the Cr nanoparticles were internally converted into CrN. The coating decreased in thickness but increased in hardness with the increase in the Cr content from 10.8 to 30 (by wt.%). Moreover, the Cr content increase caused a shift of the hardest area of the nitrided coating from the innermost to the topmost surface, as a result of the change in the nitridation mechanism of the composite from the internal to external.