超音速等离子喷涂WC-17Co涂层的工艺及性能分析
Process and properties of supersonic plasma sprayed WC-17Co coating
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摘要: 以低成本压缩空气和丙烷作为工作气体，采用超音速等离子喷涂制备了WC-17Co涂层，研究了喷涂功率对涂层组织、孔隙率和相组成的影响，测试了涂层的抗压性和耐磨性.结果表明，喷涂功率显著影响粉末的熔化和脱碳程度，功率过小时，WC颗粒熔化程度低；功率过大时，WC严重脱碳生成W2C甚至W相.喷涂功率为65 kW制备的涂层孔隙率最低（0.87%），未出现严重脱碳产物钨，涂层具有很强的抗压入变形能力，由于高硬度WC颗粒的存在，涂层的耐磨性显著提高，其磨损量仅为基体的15%，磨损形式由基体的严重磨粒磨损+粘着磨损变为涂层的轻微磨粒磨损.Abstract: The WC-17Co coating was fabricated by supersonic plasma spraying with the low-cost working gas composed of air and propane. The effect of spraying power on the microstructure, porosity and phase composition were investigated. The spraying power showed significant influence on the melting and decarburization behaviors of powder. A low spraying power corresponded to a low melting rate and small decarbonization of WC powder, while an excessive high power would cause serious decarburization with decomposition products of W2C or even W. A coating with the lowest porosity (0.87%) was sprayed at a power of 65 kW, without the formation of W phase. The coating had strong compressive resistance and anti-deformability, whose wear loss was 15% of the base metal. Because of the high-hardness WC particles, wear resistance of WC-Co coating has been significantly improved. The wear behavior was changed from severe abrasion and adhesive wear of base metal into slight abrasion wear of WC-Co coating.
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Keywords:
- supersonic plasma spraying /
- WC-17Co /
- spraying power /
- decarburization /
- wear
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