Abstract
The combustion synthesis behavior of Mo–Si–B powder was investigated. Test specimens with nominal compositions including MoSi 2, Mo(Si 0.975B 0.025) 2, Mo(Si 0.95B 0.05) 2, Mo(Si 0.925B 0.075) 2 and Mo(Si 0.9B 0.1) 2 were employed. The combustion mode, propagation velocity of combustion wave, combustion temperature and combustion product structure were studied. The results showed that the combustion wave propagated along a spiral trajectory till reaching the bottom of the compacts. The combustion temperature was increased by the addition of boron, to as high as 1922 K in the case of the Mo(Si 0.95B 0.05) 2 sample. However, the flame-front propagation velocity decreased as a result of the addition of boron. The X-ray diffraction results showed that the combustion products of the Mo(Si 0.975B 0.025) 2 and Mo(Si 0.9B 0.1) 2 samples were composed of MoSi 2 with minor MoB. Those of the Mo(Si 0.95B 0.05) 2 and Mo(Si 0.925B 0.075) 2 samples were composed of MoSi 2 with minor MoB and MoB 2. And traces of Mo 2B 5 were identified in the Mo(Si 0.95B 0.05) 2 sample.
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