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Fused cast corundum brick
Fusion Cast Corundum Series Physicochemical Specifications
Fused α-β corundum bricks are composed of approximately 50% α-corundum and β-corundum respectively. The interlocking crystalline structure formed by their intertwined crystallization creates an extremely dense matrix, demonstrating excellent resistance to strong alkalis.
Within the temperature range below 1350°C, its erosion resistance against molten glass is comparable to that of AZS. Containing minimal impurities such as Fe₂O₃ and TiO₂, these bricks possess a minimal glassy phase in the matrix. This characteristic ensures that when in contact with molten glass, they rarely generate bubbles or foreign inclusions, thereby avoiding contamination of the molten glass.
Consequently, they are most suitable for high-grade glass furnace applications including working end walls and covering layers, gating systems, channels, and similar components. They offer excellent performance and cost-effectiveness.
Raw Material: High-purity Alumina
Melting Temperature: >2000°C
Crystal Phase Composition: α-Corundum, β-CorundumPerformance Characteristics: Low impurity content, virtually no glass phase, non-contaminating to glass
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传统用途
熔铸α-β刚玉砖以其超高的性价比，使其用途不断拓展：
1、玻璃窑炉澄清部中直接接触玻璃液的部位（传统用途）
最适宜用于高档玻璃窑炉的工作池池壁、铺面、料道和通道。
主要应用α-β刚玉砖的两个特性：
1）在1350℃以下的温度范围内，抗玻璃液侵蚀性能可与AZS相匹敌。
2）基质玻璃相极少（＜1%），与玻璃液接触时极少产生气泡等异物、从而不污染玻璃液，避免“猫爪印”等缺陷的出现。
如上图，浮法玻璃窑炉工作池α-β刚玉砖池壁侵蚀情况。一个窑期后， α-β池壁基本上没有侵蚀，只有液面线位置有轻微侵蚀痕迹。
主要应用α-β刚玉砖的四个特性：
1）不与玻璃液直接接触的前提下， α-β刚玉砖在高温下（1510℃）依然具有较高的热态强度。AZS常温抗折接近70MPa，但高温下（1510℃ ）抗折小于10MPa，易变形且有玻璃相渗出。α-β在高温下（ 1510℃ ）抗折基本没有变化（依然大于20MPa），且没有渗出。
新用途（一）——全氧玻璃窑炉大碹砖
新用途（二）——特种冶金电解槽
如图所示，冶金用α-β刚玉砖使用一个窑期后几乎无侵蚀
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