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Corrosion behavior of the three-dimensional C/SiC composite was investigated in a Na 2 SO 4 vapor environment at temperatures from 1000 to 1500 o C. The degradation mechanisms for the C/SiC composite could be determined by dividing a complicated function describing the weight change of the composite with temperature into several monotone functions describing the mechanisms,...
The oxidative durability of a SiC-sealed 3D C/SiC composites was investigated at 1250 o C for exposure duration of up to 9 h in the high-velocity flame of a burner rig. The testing results showed that the mass loss of the composites was related to the pores and the microcracks in the material, and the occurrence of a high-porosity zone in SiC matrix played a key role in understanding the effect...
A three dimensional C/SiC composite was prepared and flexural strengths during combustion atmosphere and weight changes in air were investigated. When oxidized in air, the C/SiC composite gained weight above the cracking temperature, and lost weight below the cracking temperature. The weight loss reached its maxumum value at about 700 o C. When oxidized during combustion atmosphere, the composite...
Oxidation tests of carbon–carbon composites with a three-layer coating were conducted in dry air from room temperature to 1700°C for 5 h. A continuous series of empirical functions relating weight change after 5 h oxidation to temperature was found to fit the test results quite well over the whole temperature range. This approach was used to interpret the different oxidation mechanisms which were...
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