为保证方镁石-尖晶石制品性能安全稳定，以电熔镁砂、高纯镁砂、a-氧化铝微粉和氧化铬微粉为主要原料，研究分析添加剂氧化钛对方镁石-尖晶石免烧成制品常温性能、烧结性能以及热膨胀性的影响。研究表明：添加剂氧化钛可以降低方镁石-尖晶石免烧成制品中尖晶石原位反应的开始温度，促进方镁石-尖晶石免烧成制品的固相反应烧结，烧结产生的体积收缩削弱了方镁石-尖晶石制品中尖晶石原位反应在1100～1300℃的过度体积膨胀。适量引入氧化钛有利于提高方镁石-尖晶石免烧成制品的热震稳定性，当氧化钛加入量为4％时，方镁石-尖晶石免烧成制品热震前后试样常温耐压强度保持率最高。
To ensure the safe and stable performance of periclase-spinel, using fused magnesia, high-purity magnesia, a-Al2 O3 and Cr2 O3 micro powder as the major raw materials, the effect of titania on the normal temperature performance, sintering property and thermal expansion property of periclase-spinel unfired product were investigated. The conclusions are that the starting temperature of in situ spinel reaction in the periclase-spinel unfired product could be reduced by additve titania. The sintering property of solid reaction was promoted. Excessive volume expansion between 1 100~1 300 ℃ could be reduced by volume contraction that was caused by reaction sintering in the periclase-spinel unfired product. The appropriate amount of titania would help to improve the thermal shock resistance of periclase-spinel unfired product. The retention rate of the compressive strength before and after thermal shock would be the best of all when the formula was added with 4% titania.
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