Coating processes – Spray coating utilizing flame or plasma heat – Silicon containing coating
Patent
1998-12-22
2000-10-10
Bareford, Katherine A.
Coating processes
Spray coating utilizing flame or plasma heat
Silicon containing coating
427453, 427454, C23C 410
Patent
active
061299545
ABSTRACT:
A process for depositing a mullite coating on a silicon-based material, such as those used to form articles exposed to high temperatures and including the hostile thermal environment of a gas turbine engine. The process is generally to thermally spray a mullite powder to form a mullite layer on a substrate, in which the thermal spraying process is performed so that the mullite powder absorbs a sufficient low level of energy from the thermal source to prevent evaporation of silica from the mullite powder. Processing includes deposition parameter adjustments or annealing to maintain or reestablish phase equilibrium in the mullite layer, so that through-thickness cracks in the mullite layer are avoided.
REFERENCES:
patent: 5391404 (1995-02-01), Lee et al.
patent: 5869146 (1999-02-01), McCluskey et al.
Heidorn Raymond W.
Spitsberg Irene T.
Wang Hongyu
Bareford Katherine A.
General Electric Company
Hess Andrew C.
Narciso David L.
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