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采用精炼钢包对两种含不同粒度SiC的Mg O-Al_2O_3-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=24.58μm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=4.34μm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SiO_2(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SiO_2(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=24.58μm的SiC比D50=4.34μm的SiC更利于提高MAC材料的抗侵蚀能力。
The industrial experiments of 115 ~ 135 furnaces on the cladding wall of two MgO-Al_2O_3-C (MAC) materials with different grain sizes of SiC were carried out by using refined ladle. It was found that the SiC grain size significantly affected the erosion rate of the MAC material. The average grain size The erosion rate of MAC material with SiC powder with D50 = 24.58μm was 1.05 mm / furnace (135 furnaces) and that of MAC material with SiC powder with average particle size D50 = 4.34μm was 1.30 mm / furnace (115 furnaces). The results show that both SiC and CO (g) react with each other to form SiO (g) and some SiO (g) react with CO (g) to form SiO_2 (s) and C ), The use of volume expansion to promote the densification of the material structure, a substantial increase in oxidation resistance; while the other part of the SiO (g) directly overflow MAC material. When the SiC particle size is large, the reaction between SiC and CO (g) is slow, which reduces the direct overflow of SiO (g) and generates more SiO 2 (s), resulting in denser structure and inhibiting the oxidation of C in MAC material. The structure and composition of the steel are more perfect, the strength is higher and the resistance to erosion and erosion of the molten steel is higher. The SiC particle size is large, which improves the material’s oxidation resistance and reduces the contact area between the material and the slag, Slag dissolution rate. Therefore, in the refining ladle environment, the average particle size of D50 = 24.58μm SiC D50 = 4.34μm of SiC is more conducive to improve the anti-erosion MAC material.