β-Sialon/Corundum Composite Refractories by Nitridation Sintering Process

β-Sialon/corundum composite refractories were prepared by using Al, Si metal powders, Al_2O_3 fine powder, and corundum aggregates as raw materials at the temperatures lower than 1600℃ by nitridation sintering process. It shows that β-Sialon (Si_(6-z)Al_zO_zN_(8-z)), corundum, 15R phase appear in all the resultant products different in the contents of β-Sialon, 15R and the Z value of β-Sialon, even though only β-Sialon and corundum phases are expected in designed materials. And the Z value of the produced β-Sialon is deviated from the designed value. Such facts were supposed to be related to the reaction progress. Additionally, these β-Sialon/corundum composite refractories were tested by alkali, molten slag and steel. The results show that composite refractories of β-Sialon with Z=1.5～2.5 have good alkali resistance and all of the composite refractories have good molten slag and steel resistance.