Mo(Si,B)2系化合物的燃烧合成特征研究

he combustion synthesis behavior of Mo-Si-B powder was carried out in the work. Test specimens with the nominal compositions including MoSi2, Mo(Si0.975B0.025)2, Mo(Si0.95B0.05)2, Mo(Si0.925B0.075)2 and Mo(Si0.9B0.1)2 were employed. The combustion mode, propagation velocity of combustion wave, combustion temperature and product structure were studied. The results show that the combustion wave propagates along a spiral trajectory till reaching the bottom of the compacts. The combustion temperature is increases with the addition of boron. That is as high as 1922K in Mo(Si0.95B0.05)2 sample. However, the flame-front propagation velocity is decreases with the addition of boron. The X-ray diffraction results show that the products of Mo(Si0.975B0.025)2 and Mo(Si0.9B0.1)2 samples are consisted of MoSi2 with minor MoB. Those of Mo(Si0.95B0.05)2 and Mo(Si0.925B0.075)2 samples are consisted of MoSi2 with minor MoB and MoB2. And a trace of Mo2B5 is identified in Mo(Si0.95B0.05)2 sample.