由铝、氧化硼和碳黑粉合成碳硼化铝  

Synthesis of Al_8B_4C_7 from Al/B_2O_3/C Mixed Powders

作　　者：余毅[1] 邓承继[1] 祝洪喜[1] 白晨[1] 

机构地区：[1]武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地,湖北武汉430081

出　　处：《稀有金属材料与工程》2008年第A01期658-661,共4页Rare Metal Materials and Engineering

基　　金：湖北省自然科学基金;武汉市科技攻关项目资助(200710421125)

摘　　要：采用铝粉、氧化硼粉和碳黑粉为原料,研究不同组成和温度反应合成碳硼化铝材料的机理。当原料Al、B_2O_3和C的摩尔比为8∶2∶13时,试样中Al_8B_4C_7在1300℃开始出现,在1600℃以上大量生成;并且随着合成温度的升高,Al_8B_4C_7的生成量呈上升趋势。在1700℃时,当试样中C含量高于反应的理论组成时,随着C含量的增加,Al_8B_4C_7的生成量先增多后减少;而在Al含量高于反应的理论组成值时,随着Al含量的增加,Al_8B_4C_7的生成量逐渐减少,但产物中的其他相的量比C过量的产物要少,表明Al适当的过量更有利于合成Al_8B_4C_7。Aluminum, boron oxide and carbon powders were reacted at different sintered temperatures and with different ratios to produce Al8B4C7 and the reaction mechanism was studied. The reaction from the mole ratio of Al, B2O3 and C of 8：2：13 started to yield Al8B4C7 at 1300 ℃ and considerable amount of the phase was produced at 1700 ℃. A certain excess of carbon enhanced the formation of the Al8B4C7 phase, but an over-amount decreased the amount of the phase. Excess of Al reduced the yield of Al8B4C7 and led to impurities in the products. It was showed that the proper excess of Al was more helpful to prepare Al8B4C7.

关 键 词：氧化硼 合成 碳硼化铝 机理 

分 类 号：TQ175.7[化学工程—硅酸盐工业]