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FINAL REMARKS The results attained in this work highlight that alumina-magnesia castables may present better performance than the one observed in lab conditions, as the constraining environment led to outstanding better results in terms of corrosion, physical and mechanical properties. Selecting the castables without changing the chemical composition was the key-issue to properly isolate the effect of expansion and, thus, constraint. When free to expand, castables containing coarse MgO grains (M100) usually present poor corrosion behavior and low mechanical strength level, as a consequence of its higher residual expansion. Nevertheless, in an expansion controlled condition (under constraint), the penetration index was reduced and the mechanical properties improved, owing to the reduction in the volume of pores and flaw closure in the castable’s microstructure. For greater expansion levels (M45 and M100 compositions) this benefit is more evident, attesting that the spinel formation volumetric change can impart a positive effect on the lining working life.This work points out that lab testing and practical trials can lead to different material’s response and, thus, one may draw attention to the industrial conditions when designing these castables in lab, in order to be able to select high-performance and more suitable materials for steel ladle applications. |
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cmds1907
铁杆木虫 (著名写手)
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RXMCDM: 金币+1, 多谢应助！ 2014-09-14 18:38:42
英语留级生: 金币+15, 翻译EPI+1, ★有帮助 2014-09-15 17:43:29
RXMCDM: 金币+1, 多谢应助！ 2014-09-14 18:38:42
英语留级生: 金币+15, 翻译EPI+1, ★有帮助 2014-09-15 17:43:29
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结束语(最后的评论) 本文获得的结果突出显示，铝镁浇注料比在实验室条件下观测的(结果)可能呈现更好的性能，由于约束环境，导致在腐蚀、物理和机械性能方面卓越的更好结果。选择不改变化学成分的浇注料是妥善隔离膨胀和约束的关键问题。当自由扩展时，含粗氧化镁颗粒(M100)的浇注料通常存在不良的腐蚀行为和低的机械强度水平，这是由于其较高的剩余膨胀所致。然而，在膨胀控制条件(约束)下，渗透(针入度)指数降低，力学性能提高，因为孔体积减少和浇注料微观结构的缺陷闭合(关闭)。对更大的膨胀水平(M45和M100组分)这个好处更加明显，证明尖晶石的形成体积变化可以对内衬使用寿命产生一个积极的影响(正向效应)。本工作指出实验室测试和实际试验会导致不同材料的响应(反应)，因此，当在实验室设计这些浇注料时，人们可能会注意到工业条件，以便能够选择高性能和更适合钢(水)包应用的材料。 |
2楼2014-09-14 18:03:59
