粉末电爆喷涂方法制备Ti_(3)SiC_(2)涂层

Preparation of Ti_(3)SiC_(2) coating by electrical explosion powder spraying method

在自制的连续送粉电爆喷涂设备上,以Ti_(3)SiC_(2)粉末为电爆喷涂材料制备了Ti_(3)SiC_(2)涂层。根据所制备涂层的表面形貌和截面特征,分析了充电电压、粉末粒径、石墨掺入量对电爆喷涂过程的影响。结果表明,粉末粒径为28μm,充电电压高于15 kV、掺入的石墨粉为10%时,涂层沉积率较高,均匀性较好。XRD分析表明,涂层由TiC与Ti_(3)SiC_(2)组成。采用胶结对偶试样拉伸试验法测定的涂层结合强度大于37 MPa。分析认为,掺和石墨粉可提高电爆时粉末的导电性,减少粉末粒子外边缘的沿面放电,使粉末获得更加充分的加热,有利于涂层的形成。

Ti_(3)SiC_(2) coating was prepared with Ti_(3)SiC_(2) powder as electrical spraying material by using self-made continuous powder-feeding electrical explosion spraying equipment.According to the surface morphologies and cross-sectional characteristics of the prepared coating,the effects of charging voltage,powder particle size,and graphite blending amount on the electrical explosion spraying process were analyzed.The results show that when the particle size of the powder is 28μm,the charging voltage is higher than 15 k V,and the appropriate amount of graphite powder is 10%,the coating deposition rate is higher and the uniformity is better.The XRD analysis results show that the coating is composed of Ti C and Ti_(3)SiC_(2).The bonding strength of the coating determined by using the cemented dual sample tensile test method is greater than 37 MPa.Therefore,graphite powder blending can improve the conductivity of the powder during electrical explosion,reduce the surface discharge of the outer edge of the powder particles,make the powder to be heated more thoroughly,and help the coating formation.