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Burner Rig Hot Corrosion of Silicon Carbide and Silicon Nitride
Author(s) -
Fox Dennis S.,
Smialek James L.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06510.x
Subject(s) - materials science , combustor , corrosion , metallurgy , silicon carbide , dissolution , impurity , silicon , grain boundary , carbide , silicon nitride , nitride , high temperature corrosion , composite material , chemical engineering , combustion , microstructure , chemistry , layer (electronics) , organic chemistry , engineering
A number of commercially available SiC and Si 3 N 4 materials were exposed to 1000°C for 40 h in a high‐velocity, pressurized burner rig as a simulation of an aircraft turbine environment. Na impurities (2 ppm) added to the burner flame resulted in molten Na 2 SO 4 deposition, attack of the SiC and Si 3 N 4 , and formation of substantial Na 2 O. x (SiO 2 ) corrosion product. Room‐temperature strength of the materials decreased as a result of the formation of corrosion pits in SiC and grain‐boundary dissolution and pitting in Si 3 N 4 .