Modeling of oxidation of self-fluxing alloys on the iron base during spraying and surfacing coatings. I. Mathematic model of equilibrium of the oxide phase alloy

摘要

A self-fluxine effect of alloys on the base of iron( the Fe-Ni-Cr-B-Si-C system) was studied. On the base of kinetics analysis of the interaction between the alloys and oxygen we have concluded that it is possible to reach thermodynamic balance between slag-flux and alloy at welding coatings. Mathematical model has been used to calculate a composition of the oxide phase that is in the balance with the alloy at the temperature 1200-2400 K. while the alloys oxidaze at 1200-1800 K, the slag is shown to consist of B_2O_3 and SiO_2 practically completely. The amount of B_2O_3 changes in range 60-80 /100, being affected by the temperature, that provides the slag melting point to less than the alloy one and the slag to act as a flux.