新型 WC-MoCoB 金属陶瓷涂层制备及其性能研究

本文以碳化钨、碳化硼、钴和钼粉末为原料,按一定比例进行机械混合,采用团聚烧结工艺制备了WC-MoCoB复合金属陶瓷粉末,并利用扫描电子显微镜(SEM)、能谱分析(EDS)和X射线衍射分析(XRD)对其微观形貌、元素含量和相组成进行了表征;进而采用超音速火焰喷涂(HVOF)工艺制备了WC-MoCoB复合金属陶瓷涂层,并对涂层的微观组织、显微硬度、结合强度及抗腐蚀等性能进行研究。研究结果表明:该团聚烧结工艺制备的WC-MoCoB复合金属陶瓷粉末具有流动性好、松装密度较高的特点。该粉末经过超音速火焰喷涂加工形成的复合金属陶瓷涂层,结合强度高、孔隙率低,同时表现出优异的耐腐蚀性能。

Preparation and Properties of the WC-MoCoB Cermet Coating

In this paper, raw materials, such as tungsten carbide, boron carbide, cobalt and molybdenumpowders, were mixed mechanically on a certain ratio. WC-MoCoB composite cermet powders were prepared by agglomeration sintering process, and its morphology, element contents and phase structures were observed by SEM, EDS and XRD. In addition, WC-MoCoB composite cermet coating was prepared by high-velocity oxygenfuel spraying (HVOF) process. And its properties were studied, including microstructure, microhardness, bonding strength and corrosion resistance of the coating. The results show that the WC-MoCoB composite cermet powder prepared by the agglomeration sintering process has the characteristics of good fluidity and high bulk density. The composite cermet coating, which is processed by HVOF, has a high bonding strength, low porosity and excellent corrosion resistane.