Research on the heat conduction mechanism of induction brazecoating

Induction brazecoating technology is an important means to improve the surface properties of materials. In this paper, copper plate and corundum are selected as substrates for induction brazecoating respectively. The temperature variation of powder and paste coating is systematically studied, and the heat conduction mode and path in the brazecoating process are analyzed. The results show that rise of the coating temperature mainly depends on the heat absorption from the substrate. The liquid-solid interface conducts heat violently and advances step by step, which promotes the melting spread of metal filler metal. The powdery brazecoating material is in a free state, and there is a gas insulation film between the powder particles and the diamond, making it difficult for substrate to conduct heat to the coating. The binder not only assists forming, shell making and oxygen isolation, but also plays an important role during melting.