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银包覆过渡族金属硒化物的制备及银基复合材料性能

Preparation of silver-coated transition metal selenides and properties of silver-based composites

  • 摘要: 为了提升银基复合材料中各相与基体之间的界面结合强度,改善材料性能,采用化学还原制备银包覆NbSe2及银包覆Ti0.09Nb0.91Se2颗粒,并通过粉末冶金法制备了Ag基复合材料。结果表明:银颗粒均匀分布在过渡族金属硒化物表面,包覆效果好。银包覆处理增加了过渡族金属硒化物与金属基体Ag之间的接触,改善了Ag与过渡族金属硒化物之间的润湿性,减小了Ag与过渡族金属颗粒之间的排斥力,使得过渡族金属硒化物在Ag基复合材料发生分解的可能性大大降低,提高了复合材料的力学性能,增强了过渡族金属硒化物与基体之间的界面结合强度。与含有NbSe2的银基复合材料相比,含有Ag包覆过渡族金属硒化物的银基复合材料的摩擦性能略有下降。

     

    Abstract: To improve the interface bonding strength between the substrate and phases in the Ag-based composite, the silver-coated NbSe2 and silver-coated Ti0.09Nb0.91Se2 particles were synthesized by chemical reduction method, and the Ag-based composites were prepared by powder metallurgy. The results show that, the silver particles are uniformly distributed on the surface of the transition metal selenides, and the Ti0.09Nb0.91Se2 particles show the better coating effect. After covering the Ag coating, the contact between the transition metal selenides and the metal matrix silver is increased, leading to the better wettability and the smaller repulsive force between Ag and the transition metal selenide. Moreover, the possibility of the transition metal selenide decomposition in the Ag-based composite materials is greatly reduced after the Ag coating. The densification of the Ag-based composite materials is improved and the interface bonding strength between the Ag substrates and the transition metal selenides is enhanced. Compared with the Ag-based composites with the uncoated NbSe2, the friction properties of the Ag-based composites containing the silver-coated transition metal selenides decrease slightly.

     

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