铝青铜在不同介质中的摩擦磨损行为研究

利用往复式摩擦磨损试验机和单摆冲击划痕试验机研究高铝青铜Cu-14%Al-X和普通铝青铜QAl9-4在3.5%NaCl、5%H2SO4、空气及纯水中滑动及其在空气中冲击载荷条件下的摩擦磨损行为.结果表明: 高铝青铜Cu-14Al-X除了在纯水及高载滑动下的磨损量高于普通铝青铜QAl9-4以外,其它条件下的耐磨性均优于QAl9-4;在纯水中,高铝青铜Cu-14Al-X于高载滑动下的磨损量突增现象与Al含量高而塑性降低有关;通过不同冷却时的摩擦系数和加热样品硬度的测定发现,在腐蚀性介质中,高铝青铜摩擦磨损性能的改善是由于滑动接触表面成分因脱铝腐蚀而变软以及腐蚀产物参与摩擦过程的缘故.

A Study on Friction and Wear of Aluminium Bronzes in Different Media

Friction and wear behavior of two aluminium bronze specimens(Cu-14%Al-X and QAl9-4) was examined using reciprocating tester in different media(3.5%NaCl,5%H2SO4,pure water,air) and a single pendulum impact scratch tester.The results show that high aluminium bronze(Cu-14%Al-X) exhibited better wear resistance than QAl9-4 both in steady or impact loading, and the wear loss of two bronze specimens in solutions was lower than those in dry sliding,except that when the rubbing pair immersed in pure water at high load,the frictional coefficient in pure water was high than those in corrosive solutions even in dry sliding.The obvious effect of corrosive products and rubbing heat on the improvement of friction and wear performance of aluminium bronzes was verified by determination of frictional coefficient in different cooling environment and by measuring hardness of heated samples.