Gemological characteristics of andalusite 红柱石的宝石学特征研究
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Andalusite - mica schist 红柱云片岩
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Taking the andalusite from south africa and alumina fiber as raw materials , adding aluminum sulphate as binder , fabrication and properties of alumina fiber reinforced andalusite composite was studied through wet dispersion , mould pressing and sintering processes 以红柱石和氧化铝纤维为原料，用硫酸铝作为结合剂，经过分散、混合、半干法成型、高温烧成工艺，对氧化铝纤维增强红柱石基复合材料的制备及性能进行了研究。
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Results show that : ( 1 ) for each particle size of andalusite , variation tendency of the properties of the material is generally the same : the maximum of bulk density , compressive strength and rupture strength appears in the range of 5 % - 10 % content of fiber , these properties of the material remarkably decrease as the fiber content exceed 10 % ; while at the same fiber content , the properties of the material increase with the increase of firing temperature 结果表明： ( 1 )对于不同粒度的原料，性能变化规律大致相同：在同一烧成温度下，体积密度、常温耐压强度、常温抗折强度在5 10之间出现峰值，加入量超过10之后材料的性能明显下降；在相同的纤维含量下，随着烧成温度的提高，试样的各项性能均有所上升。
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( 2 ) the properties of the material with finer andalusite particle size are superior to those of coarse particle size at lower temperature , but properties of material of fine and coarse particle size have little difference at higher temperature . this illustrates that the andalusite particle size can lower the sintering temperature and that it brings forth not remarkable influence on the property of the material when the material is sintered completely ( 2 )对于不同粒度的原料，在烧成温度较低的情况下，粒度小的材料性能明显高于粒度大的材料，但在烧成温度较高的情况下，两者差别不大，说明原料粒度减小能降低制品的烧结温度，但在制品均完全烧结的情况下对材料性能影响不大。
