等离子喷涂制备Co基TiC金属陶瓷涂层的微观形貌及耐高温腐蚀性能

摘要

采用等离子喷涂技术在GH586合金表面制备了一层Co基TiC金属陶瓷涂层.研究了TiC含量对Co基TiC金属陶瓷涂层显微组织及耐高温腐蚀性能的影响.结果表明:TiC陶瓷颗粒与Co基粉体有良好的润湿性,呈现相互包裹的结构,涂层结合紧密无缺陷;TiC的加入,提高了Co基TiC金属陶瓷涂层的耐磨性,但当TiC含量过高时,团聚现象严重,导致涂层的耐高温腐蚀性能降低;TiC质量分数为10％时,TiC颗粒在涂层中分布较为均匀,此时涂层的耐高温腐蚀性能和耐磨性都较优.%A Co-based TiC cermet coating on the sarface of GH586 alloy was prepared by plasma spray.The influence of TiC content on the microstructure and high-temperature corrosion resistance of the coating was investigated.The results showe that TiC ceramic particles had good wettability with Co powder.A microstructure of TiC particles and Co powder wrapping with each other formed and the coating was tightly bound to the substrate without defects.Addition of TiC in the Co-based alloy powder improved the abrasion resistance of the coating.However,the agglomeration became serious when the content of TiC was overhigh,which reduced the high-temperature corrosion resistance of the coating.The coating with 10％ (mass) TiC showed excellent high-temperature corrosion resistance and abrasion resistance because TiC particles were evenly distributed in the coating.