Fe-Si-Cr-Al四元系Fe_3Si基合金在水润滑条件下的摩擦学性能

Tribological Properties of Fe-Si-Cr-Al Quaternary System Fe_3Si under Water Lubrication

利用Optimal SRV摩擦磨损试验机考察了Fe65Si25Cr5Al5、Fe70Si20Cr5Al5、Fe75Si15Cr5Al5和Fe80Si10Cr5Al5等几种Fe-Si-Cr-Al四元系Fe3Si与Si3N4配副时在水润滑条件下摩擦学性能.结果表明:Fe65Si25Cr5Al5和Fe70Si20Cr5Al5的磨损率低于纯Fe3Si和AISI 304不锈钢,同样,与这两种材料配副的Si3N4对偶材料磨损率也相对较低;Fe75Si15Cr5Al5和Fe80Si10Cr5Al5的磨损率则高于Fe3Si和AISI 304不锈钢.Fe70Si20Cr5Al5中Cr元素的化学活性高于其中Al元素的化学活性,材料表面富集的Cr2O3有效阻碍了Si3N4与水的摩擦化学反应,从而使Fe70Si20Cr5Al5在水环境中的摩擦学性能Fe3Si显著提高,在载荷分别为30、50、70和90 N条件下,Fe70Si20Cr5Al5比Fe3Si的磨损率分别降低了15.5%、20.2%、31.8%和38.2%;对偶材料Si3N4的磨损率则分别降低了67.9%、36.9%、46.6%和50.6%.

Tribological properties of Fe - Si - Cr - A1 alloys （ Fe6s Sizs Crs A1s , Fe7o Sizo Cr5 AI~, Fe75 Sits Cr5 A15 and Fe8o Silo Cr5 A15 ） in sliding against a Si3 N4 ball under water lubrication were evaluated by using an Optimal SRV tribo - meter. The results indicate that the wear rates of Fe6s Si25 CrsA15 and FeTo Si2o CrsA15 were lower than those of Fe3Si and A1SI 304 stainless steel. The wear rate of Si3N4 sliding against Fe65SizsCrsA15 and FeToSi20CrsA15 were low. The wear rate of Fe75Sil5 Cr5 A15 and Fe8o Sil0 Cr5 A15, on the other hand, were relatively higher than those of Fe3 Si and AISI 304 stainless steel. The chemical activity of Cr in FeToSizoCrsA15 was higher than that of A1 in FeToSi20CrsA1s. The enrichment of Cr203 on the worn surface of FeTo Si2o Cr5 A15 hindered the tribochemical reaction between Si3 N4 and water, which in turn accounted for the good tribological properties of FeTo Si2o Cr5 A15. Compared with Fe3 Si, the wear rates of FeTo Sic0 Cr5 A15 at the loads of 30 N, 50 N, 70 N and 90 N decreased by 15.5% , 20.2% , 31.8% and 38.2% , respectively. Meanwhile, the wear rates of Si3N4 against Fe7oSi2oCrsA15 at the loads of 30 N, 50 N, 70 N and 90 N decreased by 67.9%, 36.9%, 46.6% and 50.6% respectively compared with those of Si3 N4 against Fe3Si.