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基质组成对MgO-尖晶石浇注料抗渣性能的影响 总被引:2,自引:2,他引:0
采用静态坩埚法研究了添加不同组成尖晶石的MgO- 尖晶石浇注料基质组成与抗渣性能的关系。实验结果表明:随着基质中Al2O3 含量增加,浇注料抗渣侵蚀能力减弱,而抗渣渗透能力增强。在基质中SiO2 含量固定在10 % 的情况下,基质中Al2O3 含量在30 % ~50 % 时浇注料抗渣侵蚀性能较好;Al2O3 含量超过50 % 时,侵蚀速率急剧增加两倍以上。不同组成尖晶石对浇注料抗渣侵蚀性能没有明显影响,但含富铝尖晶石的浇注料具有较好的抗渣渗透性能。 相似文献
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对CaO-Al2O3-SiO2系统玻璃质的渣和SiO2、A3S2、C3S2、CAS2和C2AS组成的玻璃质材料作混合材的水泥受侵蚀浆体进行了物理、化学试验;X射线衍射、扫描电镜及能谱、孔结构等测试,表明混合材的组成不同,则水泥的抗侵蚀性能相差甚大,而SiO2、A3S2、C3S2、CAS2和C2AS组成的玻璃质材料的水泥抗侵蚀性能也完全不同。并探讨了这类渣的水泥受侵蚀破坏机理。 相似文献
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中间包用浇注料的主要材质为Al2O3-SiO2系,其损毁原因主要有三个方面,其它二个方面已基本解决,而龟裂和剥落尚有许多问题没有解决 本文针对该问题,研究了耐渣渗透性和耐热震稳定性的评价方法。 相似文献
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以板状刚玉为主要原料,纯铝酸钙水泥为结合剂,研究了尖晶石细粉、活性Al2O3微粉、Cr2O3微粉对透气砖性能的影响,并研究了不同材质,狭缝形式、狭缝长度和狭缝厚度对钢水渗入狭缝的影响。结果表明:适量的活性Al2O3微粉可提高透气砖浇注料的流动性和体积密度;尖晶石可显著改善试样的抗热震性能,但加入量过大会影响材料的高温体积稳定性,并恶化抗渣性能;Cr2O3微粉对材料的流动性和抗热震性能影响不显著,但可提高其抗渣性能。透气砖材质、狭缝形式和狭缝长度对狭缝渗钢的影响不明显,但狭缝厚度会显著影响钢水在狭缝中的渗透行为。与条形缝相比,环形缝可改善透气砖的透气性能,提高透气砖的使用寿命,吹通率达到了100%。 相似文献
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研究了三种不同骨料对Al2O3-尖晶石钢包浇注料性能的影响。结果表明:用电冶矾土刚玉骨科制得的浇注料具有较好的流动性、高温烧结性和抗渣性,但热震稳定性比电熔白刚玉有所降低。这主要与电冶矾土刚玉的组成和显微结构有关。 相似文献
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Stefan Schafföner Miriam Bach Constantin Jahn Lisa Freitag Christos G. Aneziris 《Journal of the European Ceramic Society》2019,39(14):4394-4403
Calcium zirconate refractories exhibit a promisingly high corrosion resistance in contact with titanium alloy melts. In the present article, we improved the thermomechanical properties of calcium zirconate based refractories by altering their microstructure and chemical composition. In a full factorial experimental design we investigated the effects of an insitu phase formation, of the addition of coarse grained MgO aggregates as well as the addition of SrCO3. Based on these factors, the chemical, physical, mechanical and thermomechanical properties as well as the resulting microstructure were thoroughly characterized. Strikingly, the addition of SrCO3 resulted in significantly improved mechanical properties before and after thermal shock. The improved thermal shock resistance can be attributed to a lower determined thermal expansion coefficient, a homogeneous pore size distribution with a reduced pore size and a better bonding between the matrix and the coarse grained aggregates. 相似文献
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ALAN ARIAS 《Journal of the American Ceramic Society》1966,49(6):334-338
The thermal shock resistance of zirconia with 15 mole % titanium prepared either by cold-pressing and vacuum-sintering or by vacuum hot-pressing was determined by radially quenching disks with thermally insulated faces under various conditions of heat transfer. The thermal shock resistance of calcia-stabilized zirconia disks was determined for comparison. For quenches from below the transformation temperature range of zirconia, the thermal shock resistance of zirconia with 15 mole % titanium was much better than that of calcia-stabilized zirconia, but for quenches from above the transformation range it was slightly inferior. The thermal shock resistance of zirconia with 15 mole % titanium is fairly insensitive to the methods of manufacture used in this investigation. In an attempt to identify the physical properties responsible for the improved thermal shock resistance of zirconia with 15 mole % titanium, the heat capacity, thermal expansion, modulus of rupture, modulus of elasticity, and thermal conductivity as functions of temperature were determined. 相似文献