【摘要】 以高岭土和工业Al(OH)3为原料,外加V2O5和AlF3,用原位合成法制备了莫来石晶须。采用XRD、SEM、EPMA等测试技术对样品的成分及微观结构进行了分析。探讨了AlF3气氛、烧成制度和V2O5添加量对晶须生长的影响,并研究了莫来石晶须的生长机理。研究表明莫来石晶须生长的最佳条件是AlF3的添加量为(质量分数)3%;晶化温度为1 400℃,时间为2 h;矿化剂V2O5的添加量为4%。莫来石晶须的生长机理是气-固(VS)机制。更多还原

【Abstract】 In-situ mullite whisker was prepared by kaolinite and commercial Al（OH）₃ with the addition of V₂O₅ and AlF₃.The compositions and the microstructure of the specimens were tested by advanced testing methodssuch as XRD,SEM and EPMA.The growth mechanism was discussed.The effect of AlF₃ atmosphere,sintering mechanism and the content of V₂O₅ on the growth of mullite whisker were studied.The results show that the bestquantity of AlF₃ is 3%,the firing temperature and temperature holding time of crystallization is 1 400 ℃ and 2 h,the best quantity of V₂O₅ is 4% and the growth mechanism is vapor-solid mechanism.更多还原