Polysilazane‐Type Coatings on Mo–Si–B Alloys: A Thermodynamic Assessment of the Phase Composition |
| |
| Authors: | Iryna Smokovych Michael Scheffler |
| |
| Affiliation: | Institute for Materials and Joining Technology, Otto‐von‐Guericke University Magdeburg, D‐39016 Magdeburg, Germany |
| |
| Abstract: | Thermodynamic analysis is conducted to identify the most probable phase composition of a polysilazane‐type coating system on Mo–Mo3Si(A15)–Mo5SiB2(T2) alloy. The Free Gibbs Energy of chemical reactions between these constituents and resulting phases are calculated. Silicon nitrides, silicon oxynitrides, and molybdenum silicides have been found in the phase equilibrium between the gas phase and condensed species of the proposed coating system. Silicon oxynitride and silica as components in the coating system are potential candidates for Mo–Si–B alloy oxidation protection in air at high temperatures. |
| |
| Keywords: | Mo– Si– B based alloys polymer derived ceramics polysilazane preceramic polymers thermodynamic calculations |
|
