喷雾转换法制备超细晶WC-12Co复合粉末HVOF涂层性能研究

发布时间：2018-04-01 21:23

本文选题：超细晶WC-Co复合粉末　切入点：喷雾转换法　出处：《稀有金属与硬质合金》2017年02期

【摘要】：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。
[Abstract]:Ultrafine WC-12Co composite powder prepared by spray conversion method was used as the raw material of thermal spraying powder. WC-12Co coatings were prepared on 4steel substrates. The microhardness, cracking toughness and abrasive wear resistance of the coatings were tested. The phase structure of composite powder and coating was analyzed by XRD and the cross section of composite powder and coating was observed by SEM. The results showed that the decarbonization of WC particles in porous hollow shell spherical composite powder occurred obviously during spraying. The coating contains W _ (2) C _ (2) C _ (4) C _ (4) W and amorphous phase. The average HV0.3/10 and crack toughness of the coatings are 1084 and 5.24 MPa / 1 / 2, respectively. The wear resistance of the coatings increases with the decrease of roughness and hardness, and the average wear mass loss is 0.783mg / min.
【作者单位】：江西理工大学工程研究院;赣州莫泰克工模具有限公司;湖南顶立科技有限公司;
【分类号】：TG174.4

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