THERMODYNAMIC CALCULATION OF INTERFACE REACTIONS BETWEEN TITANIUM MELT AND SPECIAL MOLD MATERIALS

来源期刊：中国有色金属学报(英文版)1999年第2期

论文作者：Jia Jun Ding Hongsheng Guo Jingjie Su Yanqing

文章页码：218 - 222

Key words：titanium　,interface reaction　,Gibbs free energy　,mold　,refractory materials

Abstract: On the basis of the Miedema model of heat formation and Toop equation, the reactions between titanium melt and special mold materials have been analyzed and calculated thermodynamically. The refractory molding materials involved in the calculation include such materials as carbides, nitrides and borides that possess high chemical stability and high melting points. The results show that the changes of dissolved Gibbs energy(ΔG) of the reactions are all negative in the temperature range from titanium melting point to 2 300K. This means that the chemical stability of those kinds of molding materials decreases when they contact with titanium melt. Furthermore, considering the high chemical reactivity of titanium melt, the calculation will provide some instructions to choose mold materials for titanium castings.