以Al和B2O3为原料采用燃烧合成方法制备了AlB2-Al2O3复合粉体,研究了Mg的添加量对燃烧反应产物物相组成的影响.用温度-时间记录仪测定了反应的燃烧温度,并计算了燃烧波速度;用XRD研究合成产物的物相组成;用差示扫描量热-热重研究了原料混合粉在加热过程中的反应过程;用场发射扫描电子显微镜、能谱研究合成产物的显微形貌.结果表明,随着Mg的增加,Al-B2O3-Mg体系燃烧温度降低,燃烧波速度加快;产物物相有Al2O3、A1B2、MgAl2O4固溶体及残余的Al,随着Mg添加量的升高,MgAl2O4固溶体增加,Al2O3和Al降低,A1B2先增加后减少,在添加6wt％ Mg时到达最高值;DSC-TGA结果显示添加6wt％ Mg时燃烧合成反应的引燃温度为1182 K;扫描结果显示A12O3为粒径2～4 μm的球状颗粒,AlB2为粒径5～10 μm的颗粒,Mg A12O4固溶体为不规则连续基体.
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