By J.R. Blachere
Describes hot temperature corrosion of ceramics. as well as natural unmarried crystals or CVD fabrics, normal engineering fabrics of assorted purities have been additionally studied. The environments used to supply corrosion have been chosen in accordance with the chance in their being encountered in perform and their severity. The ceramic fabrics built corrosion resistance via being resistant to the surroundings or via constructing passivity.
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Describes hot temperature corrosion of ceramics. as well as natural unmarried crystals or CVD fabrics, normal engineering fabrics of assorted purities have been additionally studied. The environments used to provide corrosion have been chosen according to the possibility in their being encountered in perform and their severity.
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Extra info for High Temperature Corrosion of Ceramics
And therefore The observed for the acidic hot corrosion of Silicon trends in the variation qualitatively and Silicon are expected of these materials that of silicon are predicted Carbide by these constants to their oxidation models. and High apparent activation energies consistent with the models although that for the silicon-side such as those measured to have different of the parabolic compared 29 Nitride for hot corrosion are generally of silicon carbide could not be estimated. The behavior impurities of engineering they contain.
Grain boundaries silicate This is illustrated of high purity polycrystalline after long term cyclic exposures. silicates formed near triple points. was formed and the crystals growth of silicate interesting, crystals various alkaline in the materials. role in the corrosion dissolve the alumina grains by formation The two reactions, proceed the grain reaction cooperatively, Therefore polycrystalline most technical coatings ceramics. on superalloys based impurities but in a general are not favorable in the field of stability gaseous corrosion experiments.
26 and under the two oxidize the sulfate of sodium oxide in equilibrium is set up in between and the of sodium oxide in the sulfate For acidic conditions, atmosphere it than for dry under acidic conditions. with the substrate. wet the oxide, and a surface and basic, the rate of oxidation and both are greater droplets are observed They are controlled in markedly from acidic (measured For the purer materials behaviors has been studied oxygen initially The oxide layers formed tend to be vitreous in between in the samples while during acidic corrosion The hot corrosion under the liquid sulfate.