Analysis of the phase diagram and thermochemistry in the Ta–N and the Ta–C–N systems
1998; Elsevier BV; Volume: 278; Issue: 1-2 Linguagem: Inglês
10.1016/s0925-8388(98)00582-9
ISSN1873-4669
Autores Tópico(s)Intermetallics and Advanced Alloy Properties
ResumoAn analysis of the thermochemical properties and the phase diagram of the Ta–N system has been performed, including the liquid phase, the solid solution of N in bcc Ta, the NaCl-type structure phase TaNx, the hexagonal Ta2Nx phase and the hexagonal ε-TaN phase. The Gibbs energy functions of the individual phases were evaluated by computer coupling of phase diagram data and thermochemical data. The analysis is based on a combination of experimental and estimated values. The thermodynamic description of the Ta–N system has been combined with a recently presented description of the Ta–C system, and phase equilibria in the Ta–C–N system have been calculated. Comparisons between calculations and experiments are presented.
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