Si3N4 (0 and 6 mass%) were added to Al-Al2O3 composite respectively, with phenolic resin as binder, to make Al-Si3N4-Al2O3 unfired composites, which were dried at 200°C for 24h.The creep properties of composites were tested researched under 0.2MPa×50h at 1300°C. The results indicated that the samples put up the features of steady-state creep stage from 25h to 50h; Al4O4C appeared in the corundum matrix with the addition of Al,which improve its creep resistance; when Al and Si3N4 were both existed, sialon phase was formed while Al4O4C was disappeared.
Al-Si3N4-Al2O3composite was prepared using tabular corundum, white fused corundum,α-Al2O3fine powder and Si3N4fine powder as raw materials and phenolic resin as low temperature binder under nitrogen atmosphere at 1 300 °C for 8 h. The results show that the main reinforced phase of Al-Al2O3is Al4O4C in Al-Al2O3specimens without Si3N4fine powder adding,the main reinforced phase of Al-Si3N4-Al2O3is SIALON while small quantity of Al,Si plastic phase presents in Si3N4adding Al-Al2O3specimens. Si5AlON7(Z=1) is formed in Al-Si3N4-Al2O3specimens at low temperature (1 300 °C), which presents good comprehensive properties.
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