提高刚玉质耐火材料热震稳定性的研究

Improvement and study on the thermal shock resistance of corumdum refractory material

利用微气孔和弥散的ＺｒＯ２能改善耐火材料热震稳定性的特点，在含有一定数量微气孔的刚玉质耐火材料中，加入弥散的ＺｒＯ２，将ＺｒＯ２的增韧作用应用于刚玉质耐火材料热震稳定性的设计中。实验结果表明，当气孔的数量控制在１４％左右，ＺｒＯ２的外加量达６～９ｗｔ％时，能有效地改善刚玉质耐火材料的热震稳定性。在１１００℃，水冷的条件下，经１０次热震试验后，耐压强度保持不变，残余抗折强度为４５％。

According to the fact that thermal shock resistance increases with increase of porosity and ZrO2 addition,the tougheningmechanism of ZrO2 is used to design the thermal shock resistance of corundum refractory material by adding scattered ZrO2.The experiment results have shown that the thermal shock resistance can be improved efficiently by controlling 14 % porosityand adding 6 % --9% ho2. After 10 cycles thermal shock by 1100-- 20℃,its compressive strength keep unchanged and residual bending strength is,45%.