【作者】 彭从华；

【导师】 梁永和；

【作者基本信息】 武汉科技大学 ， 材料学， 2006， 硕士

【摘要】 铝镁质浇注预制块因具有优良的抗炉渣的侵蚀、渗透性能和便利的施工性能越来越多地被使用在钢包内衬上。本文主要研究了以水合氧化铝为结合剂的铝镁质浇注预制块,其研究内容主要有以下几个方面:首先,对比研究了不同结合系统铝镁质浇注料的性能;其次,研究了基质组成和骨料组成对浇注料性能的影响;最后研究了分散剂对浇注料流变性能的影响。研究结果表明:采用水合氧化铝为结合剂的浇注预制块比铝酸钙水泥作结合剂的浇注预制块具有优良的抗炉渣的侵蚀、渗透性能和较好的抗热震稳定性能。在基质组成方面,加入5%α-Al₂O₃微粉、4%的镁砂细粉和0.5～1%SiO₂微粉浇注料可获得较好的高温使用性能,而尖晶石细粉在该系统中对改善浇注料的抗侵蚀性能作用不明显;骨料方面的研究证明,采用电熔白刚玉为骨料的浇注料其综合高温使用性能较好,以亚白刚玉和棕刚玉为骨料制得的浇注料可赋予材料优良的性能价格比;最后一部分的研究表明,对于以水合氧化铝为结合剂的系统选用六偏磷酸钠和FDN作分散剂时,浇注料的流变性能比较理想,加入一定量的促凝剂,可提高浇注料干燥后的抗折强度。但是,如何深入地探明水合氧化铝的水化特性,寻找最佳的助结合剂和外加剂来控制浇注料的初、终凝时间,减少用水量,提高脱模强度等施工性能,仍需进一步的研究。更多还原

【Abstract】 Alumina-magnesia precast blocks are increasingly used in ladle linings owe to their excellent slag corrosion and penetration resistance properties and thermal shock resistance and ease of installation. Then, alumina magnesia precast blocks bonded by hydratable alumina were studied in this paper, the main contents includes the following parts:Firstly, the properties of castables with different binders such as hydratable alumina and calcium aluminate cement were comparatively investigated. Secondly, the matrix constitute and aggregate constitute such as fused white corundum and fused bauxite-corundum and bauxite of castables were investigated. Finally, influence on flow properties of castables with different dispersants and different additions were investigated.The experimental results show that the castables bonded by hydratable alumina have more excellent slag corrosion and penetration resistance properties, and being well at thermal shock resistance than that of castables bonded by calcium aluminate cement. Further, in the matrix constitutes, adding 5%α-Al₂O₃ micro powders, 4% magnesia fines and 0.5¹% micro silicon are considered that castables can attain excellent properties. It is aslo proved, with experimental results, castables using fused white corundum as aggregate have good integrated performance, but the castables using fused bauxite-corundum as aggregate are endowed with good ration of properties to cost. In the last part, sodium hexametahposphate and FDN are proved to be good as dispersants applied to castables, and proper coagulant agent additon can enhance the cold module of rupture of castables.However, deeply ascertaining the hydraulic characteristic of hydratable alumina, controlling the time of initial and final coagulant, lowering water addition and enhancing the strength of castable after demould are necessary to further research.更多还原