發(fā)布時間：2019-05-24 06:19

【摘要】：為了提高鈦合金的摩擦學(xué)性能,采用激光熔覆技術(shù)在Ti-6Al-4V合金表面制備了γ-Ni Cr Al Ti/Ti C與γ-NiCr Al Ti/Ti C/Ca F2復(fù)合涂層.采用X射線衍射儀(XRD)、掃描電子顯微鏡(SEM)、能譜儀(EDS)分析了涂層的物相和顯微組織,在球-盤式高溫摩擦磨損試驗(yàn)機(jī)上測試了不同溫度下(室溫,300℃,600℃)復(fù)合涂層的摩擦學(xué)性能.結(jié)果表明,激光熔覆的復(fù)合涂層與基體呈冶金結(jié)合,γ-Ni Cr Al Ti/Ti C/Ca F2復(fù)合涂層主要由"原位"生成的小塊狀,針狀Ti C顆粒及Ti C樹枝晶,γ-Ni Cr Al Ti固溶體基體及彌散分布的球狀Ca F2顆粒組成.由于硬質(zhì)增強(qiáng)相Ti C與增韌相γ-Ni Cr Al Ti的共同作用,γ-Ni Cr Al Ti/Ti C與γ-Ni Cr Al Ti/Ti C/Ca F2復(fù)合涂層的磨損率在試驗(yàn)溫度下都遠(yuǎn)低于Ti-6Al-4V基體;在600℃時,γ-Ni Cr Al Ti/Ti C/Ca F2涂層的平均摩擦系數(shù)為0.21,相對于基體與γ-Ni Cr Al Ti/Ti C涂層分別降低了43%,50%,表現(xiàn)出良好的高溫自潤滑減摩性能.
[Abstract]:In order to improve the tribological properties of titanium alloy, 緯-NiCr Al Ti/Ti C and 緯-NiCr Al Ti/Ti C/Ca F _ 2 composite coatings were prepared on the surface of Ti-6Al-4V alloy by laser cladding. The phase and microstructure of the coating were analyzed by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS). The coating was tested at different temperatures (room temperature, 300 鈩，

本文編號：2484628