耐火浇注料自损坏机理探讨

Analysis of self destruction of refractory castables

对实际生产中常见的耐火浇注料粉化现象进行了分析 ,认为高铝水泥浇注料的自损坏机理为高铝水泥水化产物被大气中的酸性气体 (CO2 、SO2 、H2 S)侵蚀 ,导致水化物分解 ,结合强度下降 ,引起高铝水泥耐火浇注料粉化、剥落。另外 ,随着浇注料中水分的蒸发 ,盐类物质不断向蒸发面迁移、析出 ,其中一部分含结晶水的盐类 ,进一步失去结晶水 ,伴随着体积变化 。

The self destruction of refractory castables was investigated. The results show acid gases (CO 2, SO 2, H 2S) taken out of atmosphere attack on the hydrated alumina cement CAH 10 ,C 2AH 8 and C 3AH 6 leading to the decomposition of these bonding phases and the efflorescence of this castable. On the other hand, some soluble materials transfer to the castable surface accompanying with water evaporating and further lose their structural water causing the volume change when unfired refractory castable exposes to air. This phenomenon deteriorates the self destruction of the castable.