衬底温度对等离子喷涂熔滴扁平化的影响  

Effect of substrate temperature on the splatting of plasma sprayed droplets

作　　者：傅迎庆[1] 高阳[1] 张占平[1] 黑祖昆[1] 

机构地区：[1]大连海事大学材料工艺研究所,辽宁大连116026

出　　处：《兵器材料科学与工程》2005年第2期35-38,共4页Ordnance Material Science and Engineering

摘　　要：以抛光的AISI304不锈钢表面(Ra<0.5μm)作为衬底,并在衬底温度分别为273、298、373、573K的条件下,用低功率等离子喷枪(2.5-8.0kW)向其表面喷涂Al65Cu20Cr15准晶粉末,研究准晶熔滴的扁平化行为。SEM的试验结果表明:衬底温度较低时(273-373K),Al65Cu20Cr15准晶熔滴凝固后的扁平粒子呈现不规则的溅射状,并且衬底温度越低,溅射程度越高;随衬底温度的升高,准晶熔滴在衬底表面的扁平化凝固区域逐步扩大;当衬底温度较高时(>573K),溅射不再发生,熔滴的扁平粒子呈现规则的圆盘状;将熔滴的扁平粒子由溅射状变为无"喷溅"的圆盘状时的衬底温度定义为转变温度Tt,Al65Cu20Cr15准晶的Tt为573K左右。Al65Cu20Cr15 quasicrystalline(QC) powder particles were sprayed on the mirror polished (Ra <0. 5 μm) AISI304 substrate surface maintained at different temperatures of 273 K, 298 K, 373 K, and 573 K, by using a low power plasma spraying (2. 5 - 8. 0 kW) torch in an air atmosphere, the effect of substrate temperature on the splat behavior of the particles was investigated by means of SEM (scanning electron microscopy) micrographs. The result shows that, Al65Cu20Cr15 QC particle's splat pattern had a splashed shape when the substrate temperature was between 273 K and 373 K, and the intenser splashing was recognized in the lower substrate temperature, and as the substrate temperature increases, the central solidification area of the QC droplet's splat gradually enlarged. The splashing did not occur in the higher substrate temperature range(> 573 K) and the splat morphology changed to a disk type. The transition temperature Tt, at which the particle' s splat pattern with splashing changed to the disk - like form without splashing was defined in this study, and it could be recognized at the substrate temperature of around 573 K for Al65Cu20Cr15 QC particle.

关 键 词：熔滴 准晶 20Cr 等离子喷涂 凝固 AISI304不锈钢 溅射 衬底温度 粒子 表面 

分 类 号：O484[理学—固体物理] TG244.3[理学—物理]