Al_2O_3-SiC系制品中添加物α-Cr_2O_3的行为  

Behavior of additive α-Cr_2O_3 in Al_ 2O_ 3-SiC product

作　　者：高振昕[1] 卫晓辉[1] 任刚伟[1] 常亮[1] 黄振武[1] 刘卓峰[1] 

机构地区：[1]中钢集团洛阳耐火材料研究院,洛阳471039

出　　处：《耐火材料》2004年第5期353-356,共4页Refractories

摘　　要：以电熔刚玉和SiC为基料的制品中添加适量亚微米级的绿铬 (α Cr2 O3)时 ,烧成过程中α Cr2 O3生长到 1～ 5μm ,并与刚玉表面接触区发生互扩散行为。SiC在氧化层中氧化并形成玻璃纤维 ,使氧化层的组分变为Al2 O3-Cr2 O3-SiO2 系。所形成的高硅质液相能促进 (Al2 -x,Crx)O3固溶体析晶 ,晶体呈较大的六方柱状自形晶 ,长度达 5～ 2 0 μm ,长径比 ( )为 5～ 1 0。但此液相中不含Cr2 O3。A sintered product based on fused corundum and SiC is manufactured by adding eskolaite in submicrometer grain size.In sintering process,the eskolaite grows into 1～5 μm and interdiffusion takes place on local contact surfaces of eskolaite and fused corundum.In the oxide layer,SiC is oxided into SiO 2 and forms glass fiber.The composition of oxide layer transforms into system of Al 2O 3-Cr 2O 3-SiO 2.Liquid-phase formed by SiO 2 with high siliceous promotes crystallization of ( Al 2-x,Cr x)O 3 solid solution in euhedal of hexahedral column in size of 5～20 μm with =5～10.No Cr 2O 3 exists in glass phase.

关 键 词：电熔刚玉 碳化硅 绿铬 α-Cr2O3 Al2O3-SiC制品 氧化铝 力学性能 A12O3-Cr2O3-SiC制品 氧化锆 

分 类 号：TQ175.7[化学工程—硅酸盐工业]