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在实际生产条件下,研究了含Mg-Al和Si-Al-Ba-Fe等复合金属添加对沥青结合的MgO-C复合耐火制品抗热震性和抗氧化性的影响;结果表明,这两种金属添加物均能有效地改善沥青结合MgO-C制品的抗热震性和抗氧化性。 相似文献
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研究了复合添加剂MnO2、MgO和Y2O3对Al2O3陶瓷烧结性和抗热震性的影响.试验结果表明:在复合添加剂中引入MgO和Y2O3大幅度提高了Al2O3陶瓷的致密度,促进了陶瓷的烧结,提高了材料的强度.Al2O3陶瓷的抗热震性能也得到提高,当MgO和Y2O3的含量为0.5%时,Al2O3陶瓷的临界热震温差在300℃左右,抗热震性能大大提高;继续增加MgO和Y2O3的含量,其抗热震性有所降低.添加复合添加剂的Al2O3陶瓷的抗热震性受到细晶强化和气孔的共同控制,对抗热震性提高的主要贡献为细晶强化,但气孔也会影响其抗热震性. 相似文献
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控制炉渣成分提高转炉炉龄 总被引:1,自引:0,他引:1
在宝钢300t转炉上进行了两项提高炉龄试验,即合理控制渣中MgO含量和确定炉渣TFe含量限制值。试验表明,在宝钢的生产条件下(MgO)应控制在6%~9%,TFe的限制值应不大于30%。试验证明,合理控制MgO和TFe对提高炉龄有明显的作用。 相似文献
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本文模拟钢包透气砖使用中受到的热震条件,分别采用温度梯度、1100℃风冷及1000℃~1600℃温度循环三种热震试验,研究了烧成温度对纯铝酸钙水泥结合的刚玉—尖晶石质钢包透气砖抗热震性的影响。结果表明:1000℃~1600℃温度循环对刚玉—尖晶石质钢包透气砖造成的热震破坏最为显著,1600℃×3hr烧成试样的抗热震性最好。结合XRD和SEM分析,认为1600%×3hr烧成试样中片状或板柱状六铝酸钙(CA6)晶相形成的网状交织结构能够缓冲热应力,同时Al2O3,在尖晶石(MA)中适当程度的固溶,增强结合强度,提高断裂功,有利于材料抗热震性的提高。 相似文献
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从20世纪80年代后期至今,我国充分利用我们拥有丰富的菱镁矿和鳞片状石墨的资源优势,迅速发展了MgO—C砖,广泛应用于氧气转炉炉衬、电炉炉墙和钢包渣线,取得显著提高使用寿命的良好效果。如转炉炉龄达到3000-5000炉;电炉炉墙寿命达到150炉-300炉;钢包包衬寿命在100次左右。 相似文献
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摘要:MgO-C耐火材料的低碳化有利于减少耐火材料对钢水的增碳作用,降低不可再生资源的使用量,符合绿色冶金宗旨。围绕低碳MgO-C耐火材料的抗热震性、抗氧化性、抗渣侵蚀性3个关键性能,综述了国内外学者在低碳MgO-C材料性能优化取得的研究进展。最后,对低碳MgO-C耐火材料的发展方向进行了展望。 相似文献
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The low-carbon magnesia-carbon(MgO-C)composites containing 3%(mass fraction,the same below)carbon were prepared by adding various types of carbon black(CB).The mechanical properties,oxidation resistance at 1100 ℃ in oxidizing atmosphere,and thermal shock resistance after 5 times dipping in 1600 ℃ molten steel of the low-carbon composite samples were investigated,compared with a commercial high-carbon MgO-C composite containing carbon of 16%.The results show that the mechanical properties,oxidation resistance and thermal shock resistance of the low-carbon samples are improved with the decrease of CB particle size.Thermal shock resistance of the low-carbon sample containing nanometer CB N220 is obviously better than that of other low-carbon samples,and reaches the level of the high-carbon samples. 相似文献
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研究了Al、Si和B4C几种抗氧化添加剂对低碳镁碳砖抗氧化性能的影响.利用热重法分析了加热过程中耐火材料试样的失重率;测定耐火材料的脱碳层厚度;探讨了抗氧化添加剂的作用机理;并明确了适合于低碳镁碳砖用抗氧化添加剂的种类.研究结果表明,与添加Al和Si相比,添加B4C能更好地提高低碳镁碳砖的抗氧化性能.通过在低碳镁碳砖中... 相似文献
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直流电弧炉炉底导电砖的炼钢试验 总被引:3,自引:0,他引:3
东北大学和鞍钢耐火材料公司研制的直流电弧炉炉底导电镁碳砖的实验室冶炼试验结果表明,在炼钢过程中,该材料导电性和耐侵蚀性良好,冷热启动容易,电弧燃烧平稳。 相似文献
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Olena Volkova Piotr R. Scheller Bernd Lychatz 《Metallurgical and Materials Transactions B》2014,45(5):1782-1792
Today, MgO-C bricks are widely used in steel industry due to their excellent resistance to slag corrosion and thermal shock increased particularly by the carbon content. The presence of carbon makes these bricks very susceptible to oxidation, leading to a reduction of the strength and to the penetration of metal and/or slag. The aim of this paper is to investigate the processes of carbon oxidation of MgO-C commercial bricks containing 7 and 14 pct C by both isothermal and non-isothermal methods. The results show that carbon oxidation of the samples is limited by diffusion through the pores only. If the carbon content does not have a greater influence on the oxidation process at lower temperatures, then at higher temperatures the weight loss increases with increasing carbon content. Both types of commercial bricks oxidize directly in a lower temperature range and indirectly at higher temperatures. That means that the indirect oxidation does not exist alone, but is initiated by direct oxidation of carbon. Activation energy and diffusion coefficient for different bricks have been determined and compared with literature data. The results of the investigation of the non-isothermal carbon oxidation show that for one and the same final thermal state of the refractory the carbon oxidation can be essentially minimised by choosing specific heating-up rates. 相似文献
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对熔分深还原电炉冶炼钒钛磁铁矿金属化球团过程中熔分电炉炉衬、出铁口及出渣口等部位耐火材料的侵蚀情况作了介绍,并对侵蚀原因进行了分析。电弧侵蚀、渣中氧化物的化学侵蚀、炉渣碱度不当、砖缝和裂纹等是造成熔分深还原电炉耐火材料侵蚀严重的主要原因,其中电弧侵蚀和渣中氧化物侵蚀尤为重要,占到侵蚀比例的70%以上。 相似文献