玄武岩熔液对耐火材料的侵蚀

为深入了解玄武岩高温熔体对耐火材料的侵蚀行为,参照ASTM C621—1984(2001)分别对致密氧化铬砖、致密锆英石砖和熔铸锆刚玉砖(AZS-33)进行了1 500℃72 h的玄武岩熔液侵蚀试验,并对侵蚀后试样进行了显微结构对比分析。侵蚀试验结果表明,致密氧化铬砖的抗熔融玄武岩侵蚀性最好,其次是致密锆英石砖,最差的是熔铸AZS-33砖,其在液面线处出现严重剥落现象。显微结构分析表明:致密氧化铬砖结构均匀,与玄武岩熔液反应性小,同时与玄武岩渣中的成分形成尖晶石致密层阻止了渣的进一步渗透;致密锆英石砖表面与玄武岩熔液反应产生很薄的脱锆层和玻璃相,并且其致密均匀的结构也阻止了渣的进一步渗透;熔铸锆刚玉砖的显气孔率虽然很低,对玄武岩熔液有较好的抗渗透性,但其液相量较多,因此抗侵蚀性相对较差。

Erosion of basalt melt to refractories

In order to get a thorough understanding of erosion of basalt melt to refractories,the erosion experiments of dense chrome oxide brick,dense zircon brick and fused cast zirconia-corundum brick(AZS-33) in basalt melt at 1 500 ℃ for 72 h were carried out according to ASTM C621—1984(2001) and the microstructure of the eroded specimens was analyzed.The results show that the sequence of erosion resistance to basalt melt from good to poor is dense chrome oxide brick,dense zircon brick,and AZS-33;and the severe spalling occurs in liquid level line of AZS-33.The microstructure analysis shows dense chrome oxide brick has uniform structure and less reaction with basalt melt,and can form a dense spinel layer with the components in basalt slag to prevent the further slag penetration;the surface of dense zircon brick reacts with basalt melt forming a thin de-zirconia layer and glass phase,whose dense and uniform structure also prevents the further slag penetration;AZS-33 has low apparent porosity and good penetration resistance to basalt melt,but much liquid results in poor erosion resistance.