添加熔铸锆刚玉微粉锆英石捣打料的烧结性和抗蚀性

SINTERABILITY AND CORROSION RESISTANCE OF ZIRCON RAMMING MIXES WITH THE ADDITION OF FUSED CORUNDUM ZIRCONIA MICROPOWDERS

采用行星磨微细化的熔铸锆刚玉微粉(fused corundum zirconia micropowder,mp-FAZS)改善玻璃窑池底用锆英石捣打料的烧结性和抗蚀性。测试1350℃渣蚀48h坩埚侵蚀深度等性能,结合显微结构观察,讨论含5%～25%(质量分数)mp-FAZS,1200～1400℃烧结后样品的显气孔率、侵蚀深度与mp-FAZS含量和烧结温度的关系。结果表明:添加mp-FAZS能明显改善捣打料的烧结性和抗蚀性,25%mp-FAZS,1400℃烧结样品显气孔减少高达34%,侵蚀深度下降近5倍。mp-FAZS助烧和抗蚀机制主要为mp-FAZS中的玻璃相和高表面能促进捣打料烧结性以及由FAZS、斜锆石和刚玉相所形成的侵蚀界面能够提高其抗蚀性。

The sinterability and corrosion resistance of zircon-based ramming mix for glass kiln bottoms with the addition of fused corundum zirconia micropowder （mp-FAZS） prepared using a high-energy planetary ball mill were investigated. The ramming mix specimens with 5% to 25% mp-FAZS in mass additions were sintered at 1 200 ℃ to 1 400 ℃. The influences of the mp-FAZS addition and sintering temperature on the apparent porosity, corrosion resistance and microstructure were investigated by means of micro- structural observation and crucible slag testing at 1 350 ℃for 48 h. The porosity and corrosion depth of the sample with 25% mp-FAZS addition and fired at 1400 ℃ were reduced by up to 34% and 5 times respectively compared to that without mp-FAZS. It is suggested that the sintering of the zircon-based mix with mp-FAZS added is positively influenced by the glass phase from mp-FAZS and the high surface energy of the micropowders, and the improved corrosion resistance is evidenced in the microstructure by less pores and a large amount of insoluble grains of mp-FAZS, zirconia and corundum at the boundary of the ramming mix and molten glass.