烧结温度对莫来石刚玉复相材料微观结构的影响  

Influence of Sintering Temperatures on Microstructures of Mullite-Corundum Composite Materials

作　　者：沈阳[1] 阮玉忠[1] 于岩[1] 

机构地区：[1]福州大学材料学院,福建福州350002

出　　处：《稀有金属材料与工程》2007年第A01期830-832,共3页Rare Metal Materials and Engineering

基　　金：国家"863"(2003AA322020)项目;福建省发改委项目

摘　　要：以铝型材厂阳极氧化废渣和粘土为主要原料研制莫来石刚玉复相材料,探讨不同烧结温度对复相材料的影响,分别采用XRD和SEM表征样品的晶相结构和显微结构。结果表明烧结温度可显著改变样品中晶相的组成和各晶相的相对含量;各样品主要存在莫来石固溶体相和刚玉相两种结晶相,其中莫来石固溶体为主晶相,在不同温度下有两种组成(Al4.544Si1.456O9.728和Al4.59Si1.41O9.70);随烧结温度的升高,莫来石含量逐渐增多,至1650℃,试样中莫来石含量为100%。扫描电镜下莫来石呈针柱状交织,晶体发育良好,预示得到的材料具有良好的宏观力学性能。Waste aluminum slag and clay were used as raw materials to prepare mullite -corundum composites. The influences of different Al2O3/SiO2 ratios on the crystalline phases were discussed. XRD and SEM techniques were used to characterize the crystalline phases. The results show that sintering temperature can significantly change the crystalline phases and their amount. Two crystals mullite solid solution and corundum were formed in each sample. Mullite solid solution has two compositions： Al4.544Si1.456O9.728 and Al4.59Si1.41O9.70. The amount of mullite increases with sintering temperature increasing, and reaches to the highest 100% at 1650℃. SEM observation shows that mullite takes needle-like or column shapes which indicates good properties of materials.

关 键 词：阳极氧化废渣 莫来石 刚玉 复相材料 微观结构 

分 类 号：TF124.5[冶金工程—粉末冶金]