Abstract
The oxidation behavior of pressureless liquid phase sintered SiC ceramics with Al2O3 and Y2O3 as sintering additives was investigated in the temperature range from 1000°C to 1600°C at the interval of 100°C for 5h. The relationship between residual flexural strength and microstructure was analyzed in detail. It was found that the SiC specimens suffered from mild oxidation below 1300°C. The flexural strength of SiC specimens after oxidation at 1100°C was the highest (90% of the original strength) due to the formation of dendritic grains, which filled pores and healed cracks. And the flexural strength was almost above 80% of the original flexural strength when the oxidation temperature was below 1300°C. Meanwhile, the weight of specimens underwent steady increase. However, when the oxidation temperature was elevated to above 1400°C, the specimens began to suffer from severe oxidation, which resulted in a lot of through pores and cracks on the surface, bringing about the sharp decrease of flexural strength to 30% of original strength when the oxidation temperature of 1600°C was reached. And the weight of the specimens after huge increase began to show downtrend when the oxidation temperature was elevated to 1600°C due to the spalling of oxidation products.
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