Characterization of nanostructured WC-Co deposited by cold spraying

被引:81
作者
Li, Chang-Jiu [1 ]
Yang, Guan-Jun [1 ]
Gao, Pei-Hu [1 ]
Ma, Jian [1 ]
Wang, Yu-Yue [1 ]
Li, Cheng-Xin [1 ]
机构
[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
关键词
WC-Co; nanocrystalline material; cold spray; annealing; critical velocity; microhardness;
D O I
10.1007/s11666-007-9096-6
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Nanostructured WC-Co coating was deposited by cold spraying using a nanostructured WC-12Co powder. The critical velocity for the particle to deposit was measured. The coating microstructure was characterized by X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy. The coating hardness was tested using a Vickers hardness tester. The deposition behavior of single WC-Co particle was examined. WC particle size was measured for comparison of deposit properties to that of sintered bulk. The result shows that the nanostructured WC-Co coating can be successfully deposited by cold spraying using nanostructured powders. The coating exhibited a dense microstructure with full retention of the original nanostructure in the powder to the coating. The test of microhardness of the coating yielded a value of over 1820 Hv(0.3), which is comparable to that of sintered nanostructured WC-Co. The deposition behavior of WC-Co powders as superhard cermet materials in cold spraying and powder structure effects is discussed.
引用
收藏
页码:1011 / 1020
页数:10
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