共查询到19条相似文献,搜索用时 218 毫秒
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RH精炼炉所用的镁铬砖这一耐火材料虽然能够具备优良的抗热震性与抗渣性,但是会对生态环境造成的严重污染,因此,各个国家的专家学者开始着力于研发新型无铬化耐火材料。本文章首先分析了镁铬耐火材料的损毁机理,探究了镁锆质、镁铝尖晶石质系列、镁钙质、MgO-C耐火材料、镁阿隆结合等无铬耐火材料的应用优势与弊端,最后就RH精炼炉耐火材料无铬化提出了的几点推进方案。 相似文献
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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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摘要:为了进一步提高长水口渣线部位用镁碳质耐火材料的服役寿命,研究了Si粉添加量(质量分数1%~5%)对镁碳质耐火材料显气孔率、体积密度、常温强度和高温抗折强度等关键性能的影响,以及与传统铝碳质耐火材料的抗渣性能对比。结果表明,随着Si粉添加量的增加,镁碳质耐火材料的显气孔率略有降低,常温强度影响不大,高温强度明显增强。其中,当Si粉添加量为5%(质量分数)时,镁碳质耐火材料高温抗折强度提高了30.2%。此外,研究发现,铝碳质耐火材料的侵蚀速率随中间包渣碱度的增大而增大,而镁碳质耐火材料在面对高碱度渣时表现出更好的抗侵蚀能力。最后,在钢厂实际环境的产品测试结果也印证了Si粉对镁碳质耐火材料使用性能的有效提升,具体为用常规铝碳质渣线浇铸SPHD、SPHE和IF钢种时的使用寿命仅为1~3炉,而用镁碳质长水口渣线浇铸的使用寿命提升到3~6炉。 相似文献
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印度塔塔钢铁公司板坯连铸机水口堵塞的成因及预防措施 总被引:8,自引:0,他引:8
铝镇静钢连铸普遍存在着中间包浸入式水口堵塞问题.堵塞由未上浮的Al2O3夹杂在铝碳质浸入式水口的入口和出口处沉积而引起,中间包衬、中间包覆盖剂、钢包下渣、水口的设计、耐火材料和保护浇铸等因素对水口堵塞都有严重影响.钢的化学成分(尤其是[O]和[S])和钙处理也是重要影响因素.测定钢中全氧量是确定钢的洁净度和预测水口堵塞的好办法. 相似文献
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连铸用的铝碳质和铝锆碳质长水口砖为实现连铸钢水罐和中间罐之间的钢水流股的密封浇铸,国外一些耐火材料生产厂家开发成功了连铸用的铝碳质和铝锆碳质的长水口砖.连铸中间罐用的长水口用高纯度原料制成并用等静压机成型.长水口砖经高温隧道窑烧成后,要在车床上加工到... 相似文献
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Effects of Y2O3 on Thermal Shock of Al2O3/TiCN Composites 总被引:3,自引:0,他引:3
Advancedstructuralceramics ,suchasoxides ,nitridesandcarbides ,havebecomepreferredrefracto rymaterialsforaviation ,spaceflight ,energyandmet allurgybecauseoftheirchemicalstability ,creepresis tanceandhightemperaturestrength .Buttheyareaf fectedgreatlybyte… 相似文献
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《钢铁冶炼》2013,40(6):398-406
AbstractThe effect of Al additions on the properties and microstructures of carbon refractories for blast furnaces was evaluated in terms of phase and microstructure evolutions as a function of the coking temperature. The formation and evolution of Al4C3, AlN and SiC crystalline phases in the matrix contribute to the excellent properties of such materials, namely high thermal conductivity and low mean pore diameter of open pores. The experimental results indicate that about 2–4 wt-%Al plus about 4–6 wt-%Si additions at ~1300°C were optimum for the manufacture of carbon refractories. 相似文献
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摘要:为了提高铁水预处理用耐火材料的物理性能和抗渣侵蚀性,在Al2O3-SiC-C耐火浇注料中引入不同含量的复合金属微粉(CMP),研究了其对Al2O3-SiC-C耐火浇注料显微结构、物理性能和抗渣侵蚀性能的影响。结果表明:CMP的加入能够促进试样中形成片状晶体、棒状纤维、细丝状纤维和晶须等多尺度增强相;随着CMP的加入,试样的常温抗折强度和耐压强度提高,当CMP加入量为6%(质量分数)时,浇注料的高温抗折强度提高了231%,热震水冷5次后试样的抗折强度保持率达到23%,比空白样提高了77%,抗渣侵蚀面积减小了37.2%。 相似文献
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In order to improve the physical properties and slag corrosion resistance of refractory materials for hot metal pretreatment, different contents of composite metal powders (CMP) were introduced into Al2O3-SiC-C refractory castables. The effect of CMP on the microstructure, physical properties and slag corrosion resistance of Al2O3-SiC-C refractory castables were studied. The results show that the multi scale reinforcing phases including flake crystals, rod shaped fibers, filamentous fibers and whiskers are in situ formed in the samples with addition of CMP, which result to the improvement of the cold modulus of rupture and cold crushing strength. When the addition of CMP is 6 wt.%, the high temperature modulus of rupture increases by 231%, the thermal shock resistance increases by 77% after thermal shock by water cooling 5 times and the percentage of the slag resistant area reduces by 37.2%. 相似文献