超音速等离子喷涂WC-10Co4Cr涂层的力学性能及冲蚀磨损失效分析
Analysis on Mechanical Properties and Erosion Failure Mechanism of Supersonic Plasma Sprayed WC-10Co4Cr Coating
摘 要
为改善水轮机表面的抗冲蚀磨损性能,采用超音速等离子喷涂微米WC-10Co4Cr粉末制备碳化物金属陶瓷涂层。对涂层的显微硬度、孔隙率、结合强度、抗冲蚀性能进行了测试,通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)表征和分析了WC-10Co4Cr涂层的物相组成、微观组织结构,并探讨了涂层在含沙水流中的冲蚀磨损失效机制。结果表明:获得的WC-10Co4Cr涂层的孔隙率为0.5%,平均显微硬度达1 226 HV0.2,结合强度为70 MPa,涂层的抗冲蚀磨损性能是基体的2.46倍,可有效提高基体的抗冲蚀性能,在含沙水流作用下的冲蚀磨损失效以犁削和剥落磨损为主。
WC-10Co4Cr
微观结构
结合强度
冲蚀磨损
supersonic plasma spraying
WC-10Co4Cr
microstructure
bond strength
erosion
Abstract
In order to improve the anti-erosion property of turbine surface, WC-10Co4Cr cermet coating was prepared by supersonic plasma spraying system. The micro-hardness, porosity, bond strength and anti-erosion performance were measured. Phase composition and microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Erosion failure mechanism in the sandy stream was analyzed as well. The results indicated that the coatings had 0.5% porosity, the average micro-hardness reached to 1 226 HV0.2 and the bond strength was reached to 70 MPa. The anti-erosion property of the coating was 2.46 times to the matrix, which effectively improved the anti-erosion performance of the matrix. In the sandy stream, the erosion was most caused by the sand plowing wear and flaking erosion.
中图分类号 TG142.71
所属栏目 试验与研究
基金项目 国家“948”项目(201218);杭州市科技发展计划项目(20120433B35)
收稿日期 2014/5/21
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网络出版日期
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备注刘娴(1964-),女,高级工程师。
引用该论文: LIU Xian,ZHOU Xia-liang,CHEN Xiao-ming,FU Li,MAO Peng-zhan. Analysis on Mechanical Properties and Erosion Failure Mechanism of Supersonic Plasma Sprayed WC-10Co4Cr Coating[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2014, 50(11): 785～788
刘娴,周夏凉,陈小明,伏利,毛鹏展. 超音速等离子喷涂WC-10Co4Cr涂层的力学性能及冲蚀磨损失效分析[J]. 理化检验－物理分册, 2014, 50(11): 785～788
被引情况:
【1】王春生,田增,王延民,吕祥鸿,闵鹏,邓强,黎强,刘汉广, "氮气钻井过程中的耐冲蚀涂层",理化检验－物理分册 51, 155-158(2015)
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