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.
出处
《耐火材料》
CAS
北大核心
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)
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
aluminum-containing dross
rutile
aluminothermic reduction- nitridation
titanium nitride-aluminacomposite powder
phase compositions
