Abstract
Based mainly on SiC aggregate and fine powder, silicon powder, flake graphite (300 μm, 45 μm), α-Al2O3 micro-powder and AlN powder, Graphite-SiAlON bonded SiC composite were prepared. The influence of graphite addition, which varied from 0 to 9.7%, and its grain size on the oxidation resistance was investigated at 1 150 °C under air atmosphere. The results show that: 1) mass change rate reduces with the increase of graphite addition, the mass change rate of sample with 45 μm graphite is higher than that of sample with 300 μm graphite; 2) the cold modulus of rupture of sample with 45 μm graphite after oxidation is higher than that of sample with 300 μm graphite; 3)the oxidation resistance declines along with the increase of graphite addition, additionally, the oxidation resistance of sample with 45 μm graphite is superior to that of sample with 300 μm graphite; 4) 7.5% graphite is recommended as the proper addition.
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