【摘要】：為了改善Ti6Al4V合金的摩擦學(xué)和高溫抗氧化性能,預(yù)置Ni Cr/Cr3C2-Al-Si復(fù)合粉末,采用激光熔覆技術(shù)在鈦合金表面制備復(fù)合涂層。表征了涂層的顯微組織結(jié)構(gòu),測(cè)試了涂層的摩擦學(xué)和高溫氧化性能,并分析了相關(guān)機(jī)理。結(jié)果表明:涂層由Ti C、Ti5Si3和Cr3Si增強(qiáng)相及γ-Ni/Al8Cr5基體組成,平均顯微硬度為750 HV0.5,約為Ti6Al4V(360 HV0.5)合金的2倍。室溫(25℃)下,由于涂層的高硬度可有效抵抗塑性變形,涂層表現(xiàn)出較好的耐磨性能;高溫(600℃)下,鈦合金表面生成氧化膜,呈現(xiàn)自潤(rùn)滑效果,而涂層表面產(chǎn)生裂紋,耐磨性能輕微降低。恒溫(800℃)氧化32 h后,鈦合金表面發(fā)生嚴(yán)重氧化腐蝕,而涂層表面生成致密的Al2O3、Ni O和Cr2O3混合氧化物,有效阻止了氧原子的擴(kuò)散,高溫抗氧化性能約為鈦合金基體的8.4倍。
[Abstract]:In order to improve the tribological and high temperature oxidation resistance of Ti6Al4V alloy, Ni Cr/Cr3C2-Al-Si composite powder was preset and the composite coating was prepared on the surface of titanium alloy by laser coating. The microstructure of the coating was characterized, the tribological and high temperature oxidation properties of the coating were tested, and the related mechanism was analyzed. The results show that the coating is composed of Ti C, Ti5Si3 and Cr3Si reinforced phase and 緯-Ni/Al8Cr5 substrate, and the average microhardness of the coating is about 2 times of that of Ti6Al4V (360 HV0.5) alloy with an average microhardness of 750 HV0.5,. At room temperature (25 鈩，

本文編號(hào)：2485355