摘要
应用射流理论,建立了超音速火焰喷涂喷枪外焰流速度和温度计算的简化平衡模型,模拟了喷涂粒子全程加速加热过程,确定了合理的喷涂距离。研究了粒子大小和材料种类对粒子热力特性和合理喷涂距离的影响。对喷涂20～60μm的WC-12Co硬质合金和Ni粒子,合理的喷涂距离约为0.13 m。喷涂材料种类对合理的喷涂距离影响不明显。大粒子表现出一定的热、力滞后性。粒子密度和比热容是影响粒子热力行为的主要因素。
Based on the jet theory a simplified equilibrium model of flame flow velocity and heat transfer outside the spray gun has been established. The dynamic and thermal behavior of powder particles during high velocity oxygen fuel （HVOF） spray process was numerically simulated and the reasonable spraying distance was determined. The effects of powder particle size and varieties of materials on thermodynamic characteristics and spraying distance were studied. The reasonable spraying distance for WC - 12Co The effect of powder material on and Ni cermet with the size range from 20 to 60 μm is about 0.13m the reasonable spraying distance is insignificant. The bigger particles show a lag of accelerating and heating up. The density and specific heat are two principal factors affecting the dynamic and thermal behavior of powder particle during the spray process.
出处
《玻璃与搪瓷》
CAS
2012年第2期1-6,共6页
Glass & Enamel
关键词
火焰喷涂
粒子速度
粒子温度
喷涂距离
计算机模拟
HVOF
particle velo＇eity
particle temperatilrei spraying distance
computer simulation
