金红石和铝灰铝热还原氮化合成TiN-Al_2O_3的物相研究  

Phase composition analysis of TiN-Al_2O_3 synthesized from aluminum-containing and rutile by aluminothermic reduction-nitridation method

作　　者：刘海涛[1] 闵鑫[1] 姬海鹏[1] 徐友果[1] 房明浩[1] 刘艳改[1] 黄朝晖[1] 

机构地区：[1]中国地质大学(北京)材料科学与工程学院,北京100083

出　　处：《耐火材料》2013年第2期101-103,共3页Refractories

基　　金：国家自然基金重点项目(51032007);2012年国家级大学生创新性实验计划项目(201211415028)

摘　　要：以金红石和铝灰为原料,以铝灰中的金属铝为还原剂,采用铝热还原氮化法合成TiN-Al2O3复合粉体,研究了合成温度(600～1 400℃)和铝灰配入量(比理论量少20%、理论量、比理论量多20%、比理论量多50%)对合成产物的物相组成和显微结构的影响,并分析了反应机制。结果表明:1)以铝灰和金红石为原料,以铝灰中的金属铝为还原剂,通过铝热还原氮化法可制得TiN-Al2O3复合粉体,其主要物相为TiN、α-Al2O3以及少量倍长石和MgAl2O4。2)提高合成温度或增加铝灰配入量均有利于铝热还原氮化反应的进行。3)合成产物中α-Al2O3呈板片状和柱状;TiN主要呈粒状,粒径为亚微米级,能在TiN-Al2O3复相材料中起补强增韧的作用。TiN-Al2O3 composite powder was prepared by aluminothermic reduction-nitridation method with starting materials of aluminum-containing dross and futile,and metal aluminum in the aluminum-containing dross as reducer. The influences of synthesis temperature （600-1 400 ℃） and aluminum-containing dross addition （20% lower than theoretical value,theoretical value,20% higher than theoretical value, and 50% higher than theoretical value） on phase compositions and microstructure of the composites were investiga- ted ,and the reaction mechanism was analyzed. The results show that （1）the TiN-Al2O3 composite powder can be synthesized under the experimental conditions;the main phases are TiN,a-AI203, and a little by- townite and MgAl2O3; （2）enhancing reaction temperature or increasing aluminum-containing dross addition favors the reaction of aluminothermic reduction-nitridation; （3）in the synthesized products,α-Al2O3 is platy or columnar;TiN is sub-micron granular which reinforces and toughens the composite.

关 键 词：铝灰 金红石 铝热还原氮化法 TiN-Al2O3复合粉体 物相组成 

分 类 号：TQ174[化学工程—陶瓷工业]