Using Fourier's conduction equation, a mathematical model of the temperature field for the coat of coat-cast technology is established. The relationship between the thickness, quality of the coat and casting temperature of liquid iron is analyzed. The results show that the coat quality is reliable; the combination of the coat with the base is solid; because foe temperature gradient of the coat is not large, the surface, middle and bond area of the coat are melted completely and the thickness of the coat can reach 2.3mm by using self-melting spraying alloy powder when the casting temperature is higher than 1380℃. In addition, the agreement between the calculated and measured values is good. This paper is of significant meaning for coat-cast technology and the coat quality.
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