But when heavyly loaded , the former is far better than the latter . the wear resistance of za27 alloyed with mn is no obviously better than that of common za27 alloy . under the sliding friction conditions , the wear resistance at high temperature of za27 is improved by alloyed si and reaches the highest level when the content of si is 1 - 3wt . % 裂纹主要始于脆性相si相和mn相，裂纹沿晶界扩展；在滑动摩擦条件下(常温) ，含si的za27合金在载重较小时，耐磨性与普通za合金相比没有明显提高，但在载荷较大的情况下，其耐磨性远高于普通za27合金材料；加mn的za27合金与常规za27合金相比，耐磨性没有明显提高；在滑动摩擦条件下， si的加入提高了za27合金的高温摩擦性能。
It was found that the friction force reduced when the sliding velocity increased under a relatively low applied load . the friction properties of the aligned carbon nanotube film were very uniform in test region . the film on aao template had a considerable self - lubricating effect and the friction coefficient of the film was only 0 . 082 结果表明：多孔aao模板上的定向纳米碳管薄膜在干滑动条件下其摩擦力随滑动速度的增加而减小；多孔aao模板上的定向纳米碳管薄膜在大范围内具有相同的摩擦性能，其摩擦系数仅为0 . 082 。
Tests are carried out on mechanical performance , tired performance , rubing performance and gasket to bear the weight of performance to analyze the existing problems in the assemble technology of bolt production . the improvement measures of this model the cylinder head and the corresponding torsion and checks the standard are put forward in the thesis according to actual product conditions 对缸盖螺栓机械性能、疲劳性能、摩擦性能及缸垫承载性能进行了测试，分析了现生产螺栓装配工艺存在的问题，根据实验情况及生产条件，提出了该机型缸盖螺栓装配工艺改进措施及相应的扭矩检查规范。
The performance of hydraulic transmission fluid no . 8 , hyper automatic transmission fluid ( atf ) , continuously variable transmission fluid ( cvtf ) were compared . the compared results are the reference of chosing the right fluid in cvt . the mechanism of znddp additive how effects on the performance of cvtf is investigated by x - ray photoelectron spectroscopy ( xps ) ( 4 )研究了cvt对油品的品质需求，并进行了8号液力传动油、 atf油和cvtf油的理化指标和摩擦性能对比测试，实验结果为cvt变速器油的选用提供了参考；用x -射线光电子能谱仪对znddp添加剂的作用机理进行了研究，通过四球磨斑实验，验证了znddp添加剂对自动变速器油的改性作用，为国内cvtf的研制指明了方向。
With the graphite content adjusted , a friction performanceexperiment is carried on the iron - base powder alloy brake material sample . the results show that the graphite increases with the decrease of the strength and the static friction coefficient of the material , while the dynamic friction coefficient increases correspondingly 调整铁基粉末合金刹车材料中的石墨含量，制成摩擦试样进行摩擦性能试验，结果表明材料中石墨含量增加，其强度会随之下降，摩擦系数也随之下降，而动摩擦系数则随之上升。
