MgO-SiC-C复合粉体对低碳镁碳砖性能的影响

发布时间：2018-07-31 13:50

【摘要】：镁碳砖由于其优异的热震稳定性和抗渣性而广泛应用于冶金行业。随着钢铁工业的发展和冶炼洁净钢的需求，低碳化成为了镁碳砖的发展趋势。同时，SiC因其优良的性能而代替石墨被应用到低碳镁碳砖的生产中，因此MgO-SiC-C复合粉体被引入到镁碳砖中可以优化镁碳砖的基质结构。本课题主要将实验室合成的两种MgO-SiC-C复合粉体和自立公司合成的两种MgO-SiC-C复合粉体作为基质加入到镁碳砖中，研究粉体种类对镁碳砖性能的影响，再将这四种复合粉体制备低碳镁碳砖的性能进行比较。实验结果表明：（1）与w(c)=12wt%的传统镁碳砖相比，加入实验室合成的MgO-SiC-C复合粉体制备的低碳镁碳砖的显气孔率较大，体积密度较小，热导率较低，高温抗折强度较小，抗氧化性较好，抗渣侵蚀性较差。（2）与w(c)=12wt%的传统镁碳砖相比，加入实验室合成的MgO-SiC-C复合粉体制备的低碳镁碳砖的显气孔率较大，体积密度较小，，抗氧化性较差。（3）由于具有较高的SiC含量和较小的粒度，实验室合成的MgO-SiC-C复合粉体制备的镁碳砖的高温抗折强度和抗氧化性较好。
[Abstract]:Magnesia-carbon brick is widely used in metallurgical industry because of its excellent thermal shock stability and slag resistance. With the development of iron and steel industry and the demand of smelting clean steel, low-carbonization has become the development trend of magnesia-carbon brick. At the same time, sic is used in the production of low carbon magnesia carbon brick because of its excellent properties. Therefore, MgO-SiC-C composite powder can be introduced into magnesia carbon brick to optimize the matrix structure of magnesia carbon brick. In this paper, two kinds of MgO-SiC-C composite powder synthesized in laboratory and two kinds of MgO-SiC-C composite powder synthesized by self-supporting company were added to magnesia carbon brick as the matrix to study the effect of powder type on the properties of magnesia carbon brick. The properties of the four composite powders for preparing low-carbon magnesia-carbon brick were compared. The experimental results show that: (1) compared with the traditional magnesia carbon brick with w (c) 12wt%, the low carbon magnesia carbon brick prepared by adding the MgO-SiC-C composite powder has higher apparent porosity, smaller bulk density, lower thermal conductivity and lower flexural strength at high temperature. (2) compared with the traditional magnesia carbon brick with w (c) 12wt%, the low carbon magnesia carbon brick prepared by adding the MgO-SiC-C composite powder prepared by laboratory has higher apparent porosity and smaller bulk density. (3) because of the high content of SiC and the smaller particle size, the magnesia carbon brick prepared by the MgO-SiC-C composite powder prepared in the laboratory has good flexural strength and oxidation resistance at high temperature.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332;TF065.12

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