Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9803801 | Journal of Alloys and Compounds | 2005 | 10 Pages |
Abstract
A consistent thermodynamic data set for the Ti-Si-N ternary system is obtained by means of calculation of phase diagrams (CALPHAD) technology. The sublattice model is used to describe the ternary solid solution phases: (Ti,Si)1(N,Va)0.5 for (αTi), (Ti,Si)1(N,Va)3 for (βTi), (Ti,Si)1(N,Va)1 for TiN and (Si,Ti%)2(Si%,Ti)3Ti3(N,Va)1 for Ti5Si3Nx. The intermetallic compounds, Ti3Si, Ti5Si4, TiSi, TiSi2, Si3N4 and Ti2N are treated as stoichiometric compounds. The liquid solution phase and the diamond-Si phase are assumed to be substitutional solutions with Redlich-Kister formula for the expression of the excess Gibbs energy. The gas phase is treated as an ideal mixture. Based on the present optimized data, the interfacial reactions of Ti/Si3N4 and TiN/Si couples are analysed and the phase formation sequences are predicted. The calculation results agree well with experiments.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Xiaoyan Ma, Changrong Li, Weijing Zhang,