Heat Transfer,Mass Transfer Process of Coating and Casting Defect Control
The heat and mass transfer processes of coating during drying and pouring were introduced.The important effects of heat and mass transfer processes on the drying,anti-veining,and anti-sulfur functions of coatings were analyzed.It was pointed out:(1)Convection+infrared radiation heat exchange had the best drying efficiency and the least impact on the quality of the sand core.(2)The thermal conductivity of the coating affects the high-temperature strength and retention time of the sand core,the phase change expansion of silica sand,thermal stress and temperature difference.It would in turn affect a series of defects such as casting veins,graphite decay,scarring and sand sticking.(3)The heat and mass transfer processes of the coating could be controlled through specially designed coating components to make coating had the ability to prevent certain defective function.
万方数据
维普
