铝矾土-伊利石-高岭土体系陶瓷材料制备工艺的研究

RESEARCH ON THE PREPARATION PROCESS OF BAUXITE-ILLITE-KAOLINITE CERAMICS

以生铝矾土、高岭土和伊利石为主要原料,采用传统陶瓷工艺方法,制备了铝矾土-伊利石-高岭土体系陶瓷材料。以Al2O3质量分数在60～65%范围的坯料为研究对象,研究了原料配比和坯料细度等因素与试样的烧成温度及抗弯强度的关系。利用XRD、SEM等分析手段对材料的物相组成和显微结构进行了表征。结果表明:铝矾土-伊利石-高岭土体系陶瓷材料,在1320～1360℃烧结范围内能够制备抗弯强度110～140MPa的高强度陶瓷材料;提高铝矾土的含量和原料的细度均有利于强度的提高;添加适量的滑石有助于强度的提高以及烧结温度的降低;在原料配比相同的条件下,烧结范围下限附近烧成的试样强度较高。

Bauxite-Illite-Kaolinite ceramics were prepared by conventional methods,using uncalcined aluminum bauxite,kaolinite and illite as main raw materials.Using the mass fraction of alumina in 60%~65% range of ceramic body as object of study,the influences of raw material matching and size on the sintering temperature and the bending strength of the ceramics were studied.The phase composition and microstructure of the ceramics were investigated by XRD and SEM.The results show that high strength ceramics with the bending strength in 110 MPa ~140MPa range are prepared after sintering at 1320～1360℃.With increasing the content of bauxite and the fineness of raw materials,the bending strength of the ceramics was improved.The proper talc were advantaged to the increase of bending strength and the reduce of sintering temperature.Under the same matching of raw materials condition,the bending strength of ceramics sintering at lower limit of sintering temperature range were higher than others.