论文部分内容阅读
采用超音速火焰喷涂(HVOF)技术,以喷雾转换法制备的超细晶WC-12Co复合粉末为热喷涂粉末原料,在45#钢基体上制备WC-12Co涂层,并测试涂层的显微硬度、开裂韧性及抗磨粒磨损性能,利用XRD对复合粉末及涂层进行相结构分析,用SEM对复合粉末及涂层截面进行显微观察。结果表明,在喷涂过程中,多孔空壳球形复合粉末中WC颗粒有明显的脱碳分解发生,涂层中含有W2C、Co2W4C、W和非晶相;涂层组织呈典型的层状结构,WC晶粒有圆润化和长大现象;涂层显微硬度HV0.3/10平均值为1 084、开裂韧性平均值为5.24 MPa·m1/2,涂层表面抗磨损性能随粗糙度降低和硬度增加而提高,平均磨损质量损失为0.783mg/min。
The WC-12Co composite powder prepared by spray conversion method is a hot-spray powder material prepared by the spray technique. The WC-12Co coating was prepared on a 45 # steel substrate and the microstructure of the coating Hardness, fracture toughness and abrasive wear resistance. The phase structure of the composite powder and the coating were analyzed by XRD. The microstructure of the composite powder and the coating cross section were observed by SEM. The results show that during the spraying process, the WC particles in the porous hollow spherical composite powders have obvious decarburization and decomposition, and the coatings contain W2C, Co2W4C, W and amorphous phases. The coating has a typical layered structure with WC The average grain size of HV0.3 / 10 coating is 1084 and the average value of cracking toughness is 5.24 MPa · m1 / 2. The wear resistance of the coating surface decreases with the decrease of roughness and hardness Increased and increased, the average wear loss was 0.783mg / min.