热爆反应制备原位颗粒增强镁基复合材料

Preparation of In-situ Particulate Reinforced Magnesium Matrix Composites with Thermal Explosion Reaction

摘要: 采用Mg-TiO2-B2O3体系热爆方法制备了原位颗粒增强镁基复合材料,并对材料进行了热力学、DTA、XRD和SEM分析.结果表明：在Mg-TiO2-B2O3体系中镁的加入量小于70%(质量分数)的情况下,体系的热爆反应可以在镁液的冶炼温度自发进行,同时可原位合成MgO和TiB2颗粒.5%Mg-TiO2-B2O3体系制备的镁基复合材料的抗拉强度和布氏硬度分别比基体提高了约26%和32%.

Abstract: Thermal explosion of Mg-TiO2-B2O3 system was applied to prepare in-situ particulate reinforced magnesium matrix composite.The thermodynamics,DTA,XRD and SEM analyses were performed.The thermal explosion could spontaneously occur at the temperature of melting magnesium when the addition of magneium in the Mg-TiO2-B2O3 system was less than 70%mass and at the sametime the in-situ particulates of TiB2 and MgO were synthesized.The tensile strength and Brinell hardness of magnesium matrix composites prepared from 5%mass Mg-TiO2-B2O3 system were higher than those of magnesium matrix by about 26% and 32% separately.