Tribological properties of self-lubricating NiAl/Mo-based composites containing AgVO3 nanowires
Tribological properties of self-lubricating NiAl/Mo-based composites containing AgVO3 nanowires
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DOI：
10.1016/j.matchar.2014.09.006
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发表时间：
2014-11
影响因子：
4.7
通讯作者：
Eryong Liu;Yimin Gao;Yaping Bai;G. Yi;Wenzhen Wang;Z. Zeng;J. Jia
中科院分区：
文献类型：
--
作者：
Eryong Liu;Yimin Gao;Yaping Bai;G. Yi;Wenzhen Wang;Z. Zeng;J. Jia
采用水热法合成了钒酸银（AgVO3）纳米线，并采用粉末冶金技术制备了自润滑NiAl/Mo-AgVO3复合材料。对 NiAl/Mo 基复合材料的成分和微观结构进行了表征，并研究了从室温到 900 °C 的摩擦学性能。结果表明，NiAl/Mo基复合材料由纳米晶B2有序NiAl基体、Al2O3、Mo2C、金属Ag和氧化钒相组成。金属Ag和氧化钒相的出现可归因于AgVO3在烧结过程中的分解。磨损测试结果证实NiAl/Mo基复合材料在较宽的温度范围内具有优异的摩擦学性能。例如，当温度高于300°C时，含有AgVO3的NiAl/Mo基复合材料的摩擦系数和磨损率显着低于仅含有金属Mo或AgVO3润滑剂的复合材料，这可以归因于金属Mo和AgVO3润滑剂的协同润滑作用。此外，拉曼结果表明，在不同温度下进行磨损测试后，NiAl基复合材料磨损表面的成分是自我调整的。例如，添加金属 Mo 和 AgVO3 的 NiAl 基复合材料中，Ag3VO4 和 Fe3O4 润滑剂可改善 500 °C 下的摩擦学性能，AgVO3、Ag3VO4 和钼酸盐可改善 700 °C 下的摩擦学性能，AgVO3 和钼酸盐可改善 900 °C 下的摩擦学性能。
Silver vanadate (AgVO3) nanowires were synthesized by hydrothermal method and self-lubricating NiAl/Mo-AgVO3composites were fabricated by powder metallurgy technique. The composition and microstructure of NiAl/Mo-based composites were characterized and the tribological properties were investigated from room temperature to 900 °C. The results showed that NiAl/Mo-based composites were consisted of nanocrystalline B2 ordered NiAl matrix, Al2O3, Mo2C, metallic Ag and vanadium oxide phase. The appearance of metallic Ag and vanadium oxide phase can be attributed to the decomposition of AgVO3during sintering. Wear testing results confirmed that NiAl/Mo-based composites have excellent tribological properties over a wide temperature range. For example, the friction coefficient and wear rate of NiAl/Mo-based composites containing AgVO3were significantly lower than the composites containing only metallic Mo or AgVO3lubricant when the temperature is above 300 °C, which can be attributed to the synergistic lubricating action of metallic Mo and AgVO3lubricants. Furthermore, Raman results indicated that the composition on the worn surface of NiAl-based composites was self-adjusted after wear testing at different temperatures. For example, Ag3VO4and Fe3O4lubricants were responsible for the improvement of tribological properties at 500 °C, AgVO3, Ag3VO4and molybdate for 700 °C, and AgVO3and molybdate for 900 °C of NiAl-based composites with the addition of metallic Mo and AgVO3.