ZnO晶须对激光裂解Ti-Si复合陶瓷涂层结构和摩擦磨损及耐腐蚀性能的影响

Structure,Frictional Wear and Corrosion Resistance of Ti-Si Composite Ceramic Coatings by Laser Cracking with ZnO Whiskers

采用先驱体转化陶瓷法(PDC法)制备含ZnO晶须的Ti-Si复合陶瓷涂层,将ZnO晶须添加到激光裂解Ti-Si复合陶瓷涂的先驱体中,增强Ti-Si复合陶瓷涂层的防腐蚀性能和减摩耐磨性能。通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、往复式摩擦磨损测试仪、电化学工作站等手段,分析含不同质量分数ZnO晶须的Ti-Si复合陶瓷涂层的元素组成及存在形式、表面形貌、摩擦磨损性能以及防腐蚀性能。添加ZnO晶须对Ti-Si复合陶瓷涂层的组成和化学价态没有影响,但添加ZnO晶须对Ti-Si复合陶瓷涂层的防腐性能有改善,添加ZnO晶须对Ti-Si复合陶瓷涂层的减摩性能有改善,在较高载荷下添加ZnO晶须可以降低Ti-Si复合陶瓷涂层的摩擦因数,添加ZnO晶须质量分数为10%所得的Ti-Si复合陶瓷涂,载荷为5 N和7 N时摩擦因数均比45钢低52%。添加不同质量分数ZnO晶须对复合陶瓷涂层表面表面形貌有很大影响,同时可以改善Ti-Si复合陶瓷涂层摩擦磨损性能以及防腐蚀性能。

Ti-Si composite ceramic coating containing ZnO whiskers was prepared by precursor conversion ceramic method(PDC).ZnO whiskers were added to the precursor of laser pyrolysis Ti-Si composite ceramic coating to enhance the corrosion the corrosion resistance,friction and wear resistance of Ti-Si composite ceramic coating.By means of scanning electron microsope(SEM),X-ray powder diffraction(XRD),reciprocating friction and wear tester,electrochemical workstation,and etc.The addition of ZnO whiskers had no effect on composition and chemical speciation of Ti-Si composite ceramic coating.But the addition of ZnO whiskers can improve Ti-Si composite ceramic coating’s anti-corrosion and anti-friction performance.Moreover,adding ZnO whiskers under high load can reduce the friction coefficient of Ti-Si composite ceramic coating.The Ti-Si composite ceramic coating obtained by adding ZnO whisker of 10%mass fraction under loads of 5 N and 7 N has 52%lower friction coefficient than steel-45.The addition of different mass fractions of ZnO whiskers has a great effect on the surface morphology of composite ceramic coatings,and can improve the anti-corrosion and anti-friction performance of Ti-Si composite ceramic coating.