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SILLIMANITE MINERALS

机译：矽铝石矿物

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The sillimanite group includes the aluminosilicate minerals sillimanite, kyanite and andalusite, all of which have the same chemical composition (Al_2SiO_5). This discussion also includes the closely related mineral, mullite (about Al_6Li_3O_(15)), which, although rare in nature, is produced artificially for industrial use. All of the minerals in this group have a low coefficient of thermal expansion and high corrosion resistance. This makes them desirable for refractory applications, especially in the steel and foundry industries. Other uses include electrical insulators, abrasives and household ceramic products. The minerals in the sillimanite group decompose with an irreversible expansion at temperatures between 1,300 deg C and 1,600 deg C (2,372 deg F and 2,912 deg F). Sillimanite and andalusite have relatively small expansion on decomposition (4 percent to 6 percent) and, therefore, can be used as aggregates in refractory products. Kyanite's expansion on decomposition is large (18 percent), So it is sometimes used to balance shrinkage of other materials such as clays in refractory mixtures. For applications requiring high-temperature volume stability, mullite is more desirable. As an additive, mullite improves resistance to creep and corrosion, and imparts thermal and electrical insulating properties.
机译：硅线石族包括铝硅酸盐矿物的硅线石，蓝晶石和红柱石，它们都具有相同的化学组成（Al_2SiO_5）。讨论中还包括密切相关的矿物莫来石（大约为Al_6Li_3O_（15）），尽管它在自然界中很少见，但还是人工生产用于工业用途。该组中的所有矿物均具有低的热膨胀系数和高的耐腐蚀性。这使得它们是耐火材料应用的理想材料，特别是在钢铁和铸造行业。其他用途包括电绝缘体，研磨剂和家用陶瓷产品。硅线石组中的矿物在1,300摄氏度至1,600摄氏度（2,372华氏度和2,912华氏度）之间以不可逆的膨胀分解。硅线石和红柱石的分解膨胀相对较小（4％至6％），因此可用作耐火产品的骨料。蓝晶石在分解时的膨胀很大（18％），因​​此有时用于平衡其他材料（例如粘土）在耐火混合物中的收缩。对于需要高温体积稳定性的应用，莫来石是更理想的。作为添加剂，莫来石提高了耐蠕变性和耐腐蚀性，并赋予了隔热和电绝缘性能。

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