SHS反应火焰喷涂团聚颗粒的熔融行为及机理分析  

The melt behavior and mechanism analysis of agglomerate particles in SHS reactive flame spraying

作　　者：付永信[1] 王建江[1] 杜心康[1] 张龙[1] 陆大勤[1] 

机构地区：[1]军械工程学院先进材料研究所,石家庄050003

出　　处：《粉末冶金技术》2006年第5期331-335,共5页Powder Metallurgy Technology

基　　金：国家自然科学基金项目(50272084);军械工程学院科研基金项目(YJJXM01006)

摘　　要：针对自反应火焰喷涂制备TiC—TiB2复相陶瓷涂层过程中反应微粒在飞行燃烧时的熔融行为，进行了水淬熄实验，并以单个飞行燃烧颗粒为研究对象，分析了微粒熔融行为及反应机理。研究发现：团聚颗粒在喷涂飞行过程中经历了反应孕育、自蔓延反应引燃、颗粒芯部热爆、陶瓷熔滴的凝固结晶等四个阶段。在Ti大量熔化之前，其反应受固态扩散机制控制，之后按照溶解一析出机制进行。140～180mm喷涂距离生成状态最好的陶瓷熔滴，是喷涂的最佳距离。Aimed at the melt behavior of agglomerate particles of Ti, C, and B4C powders during reactive flame spraying for coating of TiC - TiB2 ceramic, the water quenching examination was carried out, the melt behavior and the reactive mechanism was analyzed with single flying particles. The results show that there are four stages for the agglomerate particles in the process of spraying： the reaction inoculation stage, the SHS ignition stage, the thermal explosion stage and the solidification stage, The reaction is controlled by solid diffusion mechanism before the titanium is melted in large quantity, and then the reaction is controlled by dissolution- precipitation mechanism. At spraying distance of 140-180mm, the ceramic droplets are under optimal conditions,so the distance is the optimal one.

关 键 词：SHS 反应火焰喷涂 机理分析 陶瓷熔滴 

分 类 号：TB383[一般工业技术—材料科学与工程]