摘要
将硒粉和铌粉按一定化学计量比混合,随后在800℃下固相反应生成NbSe2粉末;将得到的NbSe2粉末与一定量的Cu粉在QMISP2型球磨机上球磨9 h(转速200 r·min-1)混合均匀,干燥后放入固相反应釜中,再在800℃下固相反应得到Cu0.38NbSe2粉末;利用X射线衍射仪(XRD)和扫描电镜(SEM)分析了Cu0.38NbSe2粉末样品的相成分和微观形貌。与此同时,将Cu0.38NbSe2粉末作为润滑油添加剂添加到液体石蜡油中,采用UMT-2摩擦磨损试验机测定了其摩擦学性能。结果表明:产物Cu0.38NbSe2仍然具有母体NbSe2的六方结构,但尺寸变大并发生团聚;由此可以推断出NbSe2将会完全与基体Cu反应生成插层化合物CuxNbSe2(0<x<0.66),其作为润滑油添加剂在低载荷下表现出的摩擦学性能较差,在高载荷下的摩擦学性能较优,并解释了其摩擦机制。此外,提出NbSe2/Cu基复合材料中的润滑相是CuxNbSe2而非NbSe2。
Selenium powder and niobium powder were mixed at pre-set stoichiometric ratio and allowed to participate in solid phase reaction at 800 ℃ affording NbSe2 powder. As-obtained NbSe2 powder was then mixed with Cu powder in the type of QMISP2 ball mill （rotation rate 200 r.min-~ ） by milling for 9 h. After drying they were put in the solid phase reaction kettle and allowed to participate in solid phase reaction at 800℃ yielding Cu0.38 NbSe2 powder. The phase composition and morphology of as-prepared Cu0.3s NbSe2 pow- der were analyzed by means of X-ray diffraction（XRD） and scanning electron microscopy （SEM）. In the meantime, the as-prepared Cu0.38 NbSe2 powder was added in liquid paraffin as a lubricating oil additive, and its tribological properties were evaluated with a UMT- 2 friction and wear tester. The results showed that Cu0.3s NbSe2 still retained the hexagonal structure of NbS% matrix, but it was liable to agglomerate while its size increased as compared with that of NbSe2 matrix. Besides, it could be inferred that NbSe2 completely reac- ted with Cu matrix to generate intercalation compound CuxNbSe2 （0 〈 x 〈 0.66） ; and Cu, NbSe2 showed poor tribological properties at low loads but excellent tribological properties at high loads, the mechanism of friction was explained. Moreover, the lubricating phase in NbSe2/Cu matrix composites was CuxNbS% rather than NbSe2.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2013年第4期605-610,共6页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(51275213)
江苏省自然科学基金项目(BK2011534)资助
