摘要
为了提高刷式密封系统跑道的高温耐磨性能,在1Cr11Ni2W2MoV钢表面超音速火焰喷涂了NiCr/Cr3C2-BaF2.CaF2涂层。用扫描电镜(SEM)、能谱分析仪(EDS)、X射线衍射仪(XRD)研究了涂层的微观组织与成分,采用拉伸试验及高温摩擦磨损试验机测试了涂层的结合性能。结果表明:以NiCr/Cr3C2作为过渡层可有效增强BaF2.CaF2涂层与钢材的结合性能,避免了涂层的整体剥落;在800℃高温气氛中,NiCr/Cr3C2-BaF2.CaF2涂层表面形成了自润滑膜,有效地降低了摩擦系数,表现出优良的耐磨性能。
NiCr/Cr3C2-BaF2·CaF2 high temperature self-lubricating composite coating was prepared on 1Cr11Ni2W2MoV substrate by high velocity oxygen fuel(HVOF) spraying of NiCr/Cr3C2-BaF2·CaF2 composite powder in order to improve the high-temperature wear resistance of the runway used in brush-type sealing system.The microstructure,composition and phase constituent of the composite coating were investigated by scanning electron microscopy,energy-dispersive spectrometry,and X-ray diffraction.The adhesion to substrate and wear resistance of the composite coating were tested with a tensile adhesion tester and a high-temperature friction and wear tester.Results indicate that use of NiCr/Cr3C2 transition layer helps to effectively increase the adhesion of BaF2 CaF2 coating to steel substrate and prevent its overall detachment.A self-lubricating layer is formed on the surface of NiCr/Cr3C2-BaF2·CaF2 composite coating at an elevated temperature of 800 ℃ thereby effectively reducing the friction coefficient and increasing the wear resistance of the composite coating.
出处
《材料保护》
CAS
CSCD
北大核心
2012年第8期14-17,70-71,共4页
Materials Protection
