【摘要】 为避免燃煤ＭＨＤ发电Ａｌ＿２Ｏ＿３陶瓷电极间绝缘片在动态试验中发生开裂的现象，作者进行了在Ａｌ＿２Ｏ＿３基材料中添加第二相（ＺｒＯ＿２，Ｓｉ＿３Ｎ＿４）以提高抗热震性和改善抗裂性的研究，结果表明，所研制的Ａｌ＿２Ｏ＿３－ＺｒＯ＿２－Ｓｉ＿３Ｎ＿４多相复合新材料与Ａｌ＿２Ｏ＿３陶瓷相比，室温抗弯强度提高１４０％，抗热震临界温差△Ｔ提高７５％，在动态电弧加热器法拉第通道进行２５０ｈ试验后，电极间绝缘片全部完整，棱角清晰。更多还原

【Abstract】 It is shown from the MHD gererator test that the Al2o3 interelectrode insulator plates were generally damaged in forms of crack. In order to solve this problem .ZrO2 and Si3N4 are added in to gain a new kind of alumina base composite material .And its resistance to heat shocks is further stud-ied,The results show that the flexural strength and its critical temperature of resistance to heat shocks could be ,respectively ,140%and 75%higher than that of alumina.Therefore,the alumina base ma-terial could be improved dramatically on the resistance to heat shocks,After 250 h dynamic test ofMHD ,the interelectrode insulator plates made of new composite have complete appearance and clearedges and corners.更多还原