GeSb2Te4 films were deposited on Si substrates by RF magnetron sputtering,and the effects of sputtering power on the surface topography and anti-compression properties were studied with atomic force microscope(AFM)and nanoindenter.Meanwhile,the mechanical properties of GeSb2Te4 films with oxygen impurity were also investigated.The results indicate that proper sputtering power is important for obtaining GeSb2Te4 films with high compact structure and low surface roughness,which present good load-support capacity.Although the effect of oxygen impurity on the anti-compression properties of GeSb2Te4 films is not very significant as a whole,certain oxygen dosage can relax the internal stress,thereby the hardness of the films drops slightly.
为了解决船闸底枢由于非正常摩擦磨损导致过早失效等问题,分别采用Fz5(3)和38Cr Mo Al A作为船闸底枢蘑菇头帽的材料,与作为船闸底枢蘑菇头材料的40Cr配对为2种摩擦副.在此基础上,先利用MM200摩擦磨损试验机测量摩擦副在水润滑和脂润滑条件下的摩擦系数,再利用台架模拟系统测量由摩擦副衍生出的5种船闸底枢蘑菇头帽-蘑菇头摩擦副在模拟实际工作情况下的磨损情况.试验结果表明:2种材料的船闸底枢在脂润滑下均具有良好的摩擦特性,Fz5(3)-40Cr摩擦副和38Cr Mo Al A-40Cr摩擦副在脂润滑条件下的摩擦系数分别为0.061和0.070,而在水润滑不充分情况下38Cr Mo Al A-40Cr摩擦副可发生咬合.台架试验结果表明Fz5(3)蘑菇帽与表面开润滑槽的40Cr蘑菇头配对的摩擦副磨损性能最佳,经过150 000次工作循环,Fz5(3)蘑菇帽的磨损量仅为0.45 mm,40Cr蘑菇头的磨损量为0.12 mm,该摩擦副的使用寿命可以较好地满足船闸大修的周期要求.
