Citation:
HU Zhi-Li, LI Chang-Sheng, TANG Hua, LI Hong-Ping, LIANG Jia-Qing, ZHANG Yi, CHEN Shuai. Investigation of W Doped NbSe2 and Tribology Characteristic of Its Correlated Copper Base Composites[J]. Chinese Journal of Inorganic Chemistry,
;2013, 29(4): 767-773.
doi:
10.3969/j.issn.1001-4861.2013.00.101
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In this paper, W doped NbSe2 was prepared by solid phase synthesis method. Then Nb1-xWxSe2 copper base composites were synthesized by powder metallurgy method with a series of Nb1 -xWxSe2 concentration, using Nb1-xWxSe2 as solid lubrication phase and Cu as matrix phase. Phase identification and microstructure analysis of the resultant samples were carried out by XRD, SEM and TEM. The electrical resistance, hardness, and density of the block samples was measured with resistivity detector, electronic material testing machine and drainage method, respectively. The friction and wear performance was evaluated with friction and wear testing machine. It is found that the microstructure of Nb1-xWxSe2 changes from micron hexagonal sheet to the mixed of nanometer sheet and nanobelts with increasing W doping ratio. Whereas, there is nearly no influence on the resistance. Further, the resistivity of Nb1-xWxSe2/Cu base composites gradually becomes stronger as increasing the concentration of Nb1-xWxSe2, however, the friction coefficient exhibits different values. When x=0 and the percentage of Nb1-x WxSe2 is 10%, the NbSe2/Cu base composite presents the best friction and wear properties, i.e., the friction coefficient is 0.15 and wear scar is smooth and narrow. When x=3% and the percentage of Nb1-xWxSe2 is 5%, the Nb0.97W0.03Se2/Cu base composite presents the best friction and wear properties, i.e., the friction coefficient is 0.17 and wear scar is smoother and shallow. Since both nanobelts and nanosheet are existed in Nb0.97W0.03Se2 and they are intertwined, in the composites the nanosheets play an important role in the lubrication film and the winding nanobelts, which similar to the grass and branches of bird′s nest, enhance its toughening effect. Hence, both the mechanical and tribological properties of the composites are improved.
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