EFFECTS OF B/TiO₂ MOLE RATES ON XD COMBUSTION SYNTHESIS AND ITS MECHANICAL PROPERTIES OF Al-TiO₂-B SYSTEM

The effects of B/TiO₂ mole rates on XD(Exothermic Dispersion) reaction and mechanical properties of Al-TiO₂-B system were studied in this paper. The test results show that with the increase of B/TiO₂ mole rate from 0 to 2, the distribution of Al₂O₃ particles was improved and the amount of Al₃Ti phase decreased and finally disappeared, the ultimate strength of the composites increased from 224.5MPa to 354.5MPa and its elongation from 3.2% to 5.8%; the actual combustion temperature and combustion velocity decreased, however, the density of combustion products increased.