粉煤灰提纯莫来石制备的陶瓷材料组织及性能

Microstructrue and Properties of Mullite-ceramics Synthesized from Fly Ash

利用粉煤灰提纯莫来石制备陶瓷材料,不仅可以降低生产成本,也可以减少粉煤灰堆积带来的环境危害。以不同化学成分的粉煤灰提纯莫来石粉为原料,通过球磨、压制、烧结制得陶瓷材料。探讨了烧结温度、成分对莫来石微晶陶瓷材料的体收缩率、烧失率、表观密度、冲击韧性、显微硬度的影响,分析了所制备陶瓷材料的显微结构特点。研究表明,在1450℃下进行烧结,制得的莫来石陶瓷材料最致密,体收缩率、显微硬度最大;S型样品制得的试样致密度更高,综合性能较好;S型中氧化钙含量多,降低了莫来石陶瓷材料的冲击韧性。

To obtain the ceramics of mullite purified from fly ash not only cuts its production cost, but also improves the environment contaminated by the accumulation of fly ash. Through ball milling, pressing, sintering, the ceramic materials are prepared with different chemical compositions of mullite powders purified from the fly ash. This paper studies the influences of the sintering temperature and the composition of the microcrystalline mullite ceramics on the body shrinkage, the ignition loss, the apparent density, the impact toughness, the Vickers microhardness and the microstructure of the prepared ceramics. It is shown that with sintering mullite at 1450℃the obtained ceramic material has the most dense body shrinkage, the maximum Vickers microhardness; the sample prepared from the S type samples has an even greater density and the optimum overall performance; but the S-type sample has a large calcium oxide content and is not conducive to the impact toughness of the mullite ceramic materials.