Oxidation and burner rig corrosion of liquid phase sintered SiC
Liquid phase sintering permits lower temperatures to be used to produce SiC with a consequent saving in terms of cost, while maintaining mechanical properties. For application at elevated temperatures, corrosion resistance must also be maintained. Oxidation of a SiC produced with the addition of A12O3+Y2O3 in air of 1000?C and 1300?C resulted in protective oxidation kinetics with rates approximately an order of magnitude greater than generally available low-additive SiC. The contaminants present in combustion atmospheres, particularly S and Na, have a marked influence on the rate of material degradation depending on the partial pressure of SO3 and thus the sulphur content of the fuel. Burner rig tests at 1000?C resulted in high rates of attack due to the formation of a low viscosity Na-silicate surface layer in a low sulphur fuel combustion gas (Jet A1 kerosene). With a low-sulphur fuel (1% S marine diesel) the high SO3 partial pressure resulted in a low Na2O activity and limited acid (SiO2) base (Na2O) reaction. At 1300?C, similar rates of material degradation were observed. Details of the oxidation kinetics and oxidation product morphologies are given.
Bibliographic Reference: Article: Journal of the European Ceramics Society (1999)
Record Number: 199911393 / Last updated on: 1999-09-17
Original language: en
Available languages: en