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为了探索铝钛渣对镁质复合材料烧结性能的影响,提高镁质复合材料的使用性能,试验用电熔镁砂、高纯镁砂、氧化铝微粉和氧化铬微粉为主要原料制备镁质复合材料。用热膨胀仪对比烧前和烧后镁质复合材料的线膨胀率和线膨胀系数,结果表明,烧前镁质复合材料的线膨胀率和线膨胀系数为1 100~1 300℃,会出现较明显的增大趋势,烧后镁质复合材料的线膨胀率未出现显著增大的趋势,而线膨胀系数随着铝钛渣加入量的增大而逐渐减小。铝钛渣对镁质复合材料有促烧结作用,经1 100和1 500℃烧后的镁质复合材料体积密度和常温抗折强度随铝钛渣加入量增大而逐渐增大。
In order to explore the influence of aluminum-titanium slag on the sintering properties of magnesia-based composites and improve the serviceability of magnesium-based composites, magnesia composites were prepared by using fused magnesia, high-purity magnesia, alumina powder and chromium oxide powder as the main raw materials. Comparing the coefficients of linear expansion and coefficient of thermal expansion before and after burning, the results show that the coefficients of linear expansion and coefficient of linear expansion of pre-fired magnesia composite material are 1 100 ~ 1 300 ℃. Obvious increase trend, the coefficient of linear expansion of the burned magnesia composite material does not show a significant increase trend, and linear expansion coefficient decreases with the increase of Al-Ti slag dosage. Alumina-titanium slag has a sintering-promoting effect on magnesia composite. The bulk density and room-temperature bending strength of magnesia composite sintered at 1 100 and 1 500 ℃ increase with the addition of Al-Ti slag.