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含不同粒度SiC 的MgO–Al2O3–C 材料服役状态下的侵蚀机理
作者:李天清1 2  楠1  文1 张厚兴2 贺中央2 刘百宽2 
单位:1. 武汉科技大学 省部共建耐火材料与冶金国家重点实验室 武汉 430081 2. 濮阳濮耐高温材料(集团)股份有限公司 河南 濮阳 457100 
关键词:碳化硅粒度 氧化镁–氧化铝–碳材料 精炼钢包 侵蚀机理 
分类号:TB35
出版年,卷(期):页码:2017,45(12):1860-1866
DOI:10.14062/j.issn.0454-5648
摘要:

采用精炼钢包对两种含不同粒度SiC 的MgO-Al2O3-C(MAC)材料在包壁部位进行了115~135 炉的工业试验,发现SiC粒度显著影响MAC 材料的侵蚀速率,采用平均粒径D50=24.58 μm 的SiC 粉的MAC 材料的侵蚀速率为1.05 mm/炉(135 炉),采用平均粒径D50=4.34 μm 的SiC 粉的MAC 材料侵蚀速率为1.30 mm/炉(115 炉)。对用后MAC 材料的损毁机理研究表明:2 种材料中SiC 都与CO(g)反应生成SiO(g),一部分SiO(g)继续与CO(g)反应生成SiO2(s)和C(s),利用体积膨胀促进了材料结构致密化,大幅提高了抗氧化性能;而另一部分SiO(g)直接溢出MAC 材料。当SiC 粒度较大时,SiC 与CO(g)反应较慢,减少了SiO(g)直接溢出,生成更多SiO2(s),使得组织结构更致密,抑制了MAC 材料中C 的氧化,材料组成与结构保持更加完好,强度较高,具有更高的抗钢水冲刷磨损能力;SiC 粒度大,在提高材料抗氧化能力的同时,也减少了材料与熔渣的接触面积,降低了MgO 向熔渣的溶解速率。故在精炼钢包环境中,平均粒径D50=24.58 μm 的SiC 比D50=4.34 μm 的SiC 更利于提高MAC 材料的抗侵蚀能力。

Two kinds of MgO–Al2O3–C (MAC) refractories containing SiC with different particle sizes were examined in the sidewall of refining ladle for 115–135 heats. The results show that the corrosion rate of the MAC refractories is remarkably affected by the particle size of SiC. The corrosion rate of the MAC refractory containing SiC with the median size (i.e., D50=24.58 μm) is 1.05 mm/heat (135 heats), and that of MAC refractory containing SiC with the median size (i.e., D50=4.34 μm) is 1.30 mm/heat (115 heats). It is indicated that SiC in the two refractories reacts with CO(g) to form SiO(g), and part of SiO(g) further reacts with CO(g) to form SiO2(s) and C(s), thus improving the oxidation resistance by densifying the structure because of the volume expansion. The reaction rate of SiC and CO(g) is slower when particle size of SiC is larger, leading to the decrease of the overflow rate of SiO(g) and the production of more SiO2(s), which can densify the structure and inhibit the oxidation of carbon in MAC refractories. The more stable composition and structure of the material is, the higher strength and the better abrasion resistance will be. Furthermore, the larger particle size of SiC decreases the contact area between the slag and the material, and then decreases the dissolution rate of MgO into slag. Therefore, the the MAC refractories containing SiC with the median size (i.e., D50=24.58 μm) have a higher corrosion resistance, compared to the MAC refractories containing SiC with the median size (i.e., D50=4.34 μm).

基金项目:
国家自然科学基金(51572203);“973”计划前期研究专项(2014CB660802)资助。
作者简介:
李天清(1976—),男,博士研究生
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