Orthogonal experiment and microstructure analysis on TiC-TiB2 multi-phase ceramic coating prepared by SHS reactive spraying

摘要：

Utilizing self-propagating high-temperature synthesis (SHS) reactive spraying technology,the feeding self-combustion agglomerated particles composed of Ti,B4C and C powders,TiC-TiB2 multi-phase ceramic coatings were prepared on the steel substrates.Orthogonal experiment was carried out to optimize the spraying parameters.The phase component and microstructure of the coating fabricated at the optimized parameters were studied by XRD and SEM.The reactive mechanism in flying agglomerated particles was discussed.The optimized conditions,spraying distance of 220 mm,powders delivering gas pressure of 0.3 MPa and preheating temperature of 240 °C to sprayed particles,were obtained from orthogonal experiment.For the coating,porosity of 2.5％ and HV 1 595 are achieved under the optimized parameters.The coatings are mainly composed of TiC0.3N0.7,TiB2 and a little TiO2.The SEM analysis shows the morphology of TiC0.3N0.7 matrix in which the fine granular TiB2 crystals evenly disperse.It is concluded that,as solo reactive units,the agglomerated particles would finally form into the coatings after going through four successive stages in the flame,which are,respectively,pregnant reaction,flight combustion,collision and structure transformation and solidification.The solid diffusion and dissolution-precipitation are the two mechanisms to control the synthesis reaction.

关键词： TiC-TiB2 ceramic coating SHS reactive spraying orthogonal experiment reactive mechanism

作者: DU Xin-kang WANG Jian-jiang WANG Tian-min LIU Hong-wei LI Wei-bo

作者单位: Advanced Materials Institute,Mechanical Engineering College,Shijiazhuang 050003,China;Center of Cond Advanced Materials Institute,Mechanical Engineering College,Shijiazhuang 050003,China Center of Condensed Matter Physics and Material Physics,Beihang University,Beijing 100083,China

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）