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Polysilazane‐Type Coatings on Mo–Si–B Alloys: A Thermodynamic Assessment of the Phase Composition
Author(s) -
Smokovych Iryna,
Scheffler Michael
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700936
Subject(s) - materials science , silicon , alloy , coating , gibbs free energy , molybdenum , phase (matter) , nitride , silicon nitride , chemical engineering , metallurgy , silicon oxynitride , thermodynamics , composite material , layer (electronics) , organic chemistry , chemistry , physics , engineering
Thermodynamic analysis is conducted to identify the most probable phase composition of a polysilazane‐type coating system on Mo–Mo 3 Si(A15)–Mo 5 SiB 2 (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.