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采用钻孔取芯的方法,在用后高炉炉缸的不同部位取得了完整的用后炭砖样品。对这些样品中的脆化层进行基础性研究,包括宏观物貌、微观结构、物性参数和化学组成等,同时比较了单向正压力作用下炭砖的破坏形态和微观结构形态。认为脆化层出现在炉役的早期,发展在中期,稳定在后期。以微裂纹形态出现的早期脆化层是应力作用的结果,后期因穿过裂纹的煤气流中所含碱金属等物质的沉积和腐蚀,加剧了脆化层的质变和范围的扩大,进而改变了砖衬结构的传热体系,直至建立新的热平衡。提出改善炭砖的基质和孔径并提高导热性和抗疲劳损伤能力是弱化脆化层的形成、提高炭砖使用效果的有效途径。
The use of drilling coring method, after use in different parts of blast furnace hearth made a complete use of post-carbon brick samples. The basic research on brittle layer in these samples, including macroscopic appearance, microstructure, physical properties and chemical composition, was also carried out. The destruction morphology and microstructure morphology of carbon brick were compared under positive unidirectional pressure. The embrittlement layer is believed to be in the early stage of furnace service, developed in the medium term, and stabilized in the later period. The early embrittlement layer that appears in the form of microcracks is the result of the stress effect. In the later stage, due to the deposition and corrosion of alkali metals and other substances contained in the gas stream passing through the crack, the qualitative change and the expansion of the embrittlement layer are aggravated, Brick lining structure of the heat transfer system, until the establishment of a new thermal balance. An effective way to weaken the formation of embrittlement layer and improve the effect of carbon brick is proposed to improve the matrix and pore size of carbon brick and to improve the thermal conductivity and anti-fatigue damage ability.