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中文摘要：
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（60001400℃）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MgAl2O3。2）提高合成温度或增加铝灰配入量均有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。
英文摘要：
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.
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