共查询到19条相似文献,搜索用时 99 毫秒
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为了实现钢包用透气砖的无铬化,以板状刚玉(6~3、3~1、≤1mm)为骨料,板状刚玉细粉(≤0.044mm)、α-Al2O3微粉(≤5μm,d50=2.01μm)、镁铝尖晶石细粉(≤0.044mm)、电熔镁砂细粉(≤0.044mm)为基质,以纯铝酸盐水泥为结合剂,将骨料和基质的质量比固定为70:30,通过研究电熔镁砂细粉加入量(其质量分数1%、2%、3%、4%、5%)对铝镁质透气砖性能的影响,研制了铝镁质透气砖,与铬刚玉质透气砖的性能进行了对比.结果表明:加入质量分数2%的电熔镁砂细粉,试样的力学性能提高,抗热震性增强;进一步增大电熔镁砂细粉的加入量,由于原位镁铝尖晶石的生成量过多,微裂纹发展成为破坏性裂纹,试样的强度急剧降低,体积密度下降,试样的加热永久线变化增大,抗热震性先增强后减小,高温抗折强度下降.通过铬刚玉质透气砖和铝镁质透气砖性能及现场试用情况的对比,认为铝镁质透气砖可代替铬刚玉质透气砖使用,实现透气砖的无铬化. 相似文献
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原料有电熔刚玉颗粒(粒度分别为1.0~0.5、0.75~0.45、0.65~0.3和0.5~0.2 mm),刚玉微粉(平均粒度3.5 μm)以及n(ZrB2):n(Al2O3)=3:5的ZrB2-刚玉复合粉.试样按照颗粒与细粉质量比为75:25配料后,外加1%的有机结合剂和7%的磷酸盐,在100 MPa压力下挤压成型为μ36 mm×36 mm试样,经120℃24 h干燥后,于1 600℃保温3 h埋炭烧成j结果表明:(1)随着刚玉粒度的减小,透气砖气孔平均直径减小,显气孔率有所增大,随着刚玉粒度的减小,耐压强度增大,以0.5~0.2 mm的颗粒制成的刚玉试样的耐压强度最高,其大颗粒与基质结合紧密,基质均匀,没有明显的粗大气孔;(2)以粒度为0.5~0.2 mm的刚玉颗粒制成的炼铝工业用刚玉-ZrB2透气砖使用效果良好,没有出现堵塞现象,使用寿命超过了设计要求. 相似文献
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5 西普公司电熔砖用途表21列举了西普公司电熔砖在七小类玻璃熔窑中,不同部位的应用情况.浮法玻璃和普通平板玻璃,瓶罐玻璃和器皿玻璃中的某些种产品,都属于第一类——钠钙玻璃.就抵抗玻璃液熔蚀、冲刷性能而言,电熔铬锆刚玉砖(AZSC)是电熔锆刚玉砖(AZS)的3~5倍.所以,ER2161是熔 相似文献
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《中国耐火材料》2020,(2)
In order to improve the thermal shock resistance of chrome-corundum bricks, different amounts of andalusite were added to the formulation of chrome-corundum bricks to replace the equivalent white fused corundum with the same particle size. After mixing, shaping, drying and firing, the density, the cold strength, the cold wear resistance, the hot modulus of rupture and the thermal shock resistance were tested. XRD, SEM and elemental surface scanning were used to characterize the specimens. The results show that:(1) the volume expansion of andalusite mullitization reduces the apparent porosity of chrome-corundum bricks;(2) the density and the hardness of mullite are lower than those of corundum so the decrease of the corundum content in brick leads to the decrease of the bulk density, the strength and the cold wear resistance;(3) the cross-distributed columnar mullite in the matrix can effectively improve the hot modulus of rupture and the thermal shock resistance of the specimens;(4) considering comprehensively, the andalusite addition shall not exceed 18%. 相似文献
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刚玉砖和铬刚玉砖的应用 总被引:1,自引:0,他引:1
刚玉砖及铬刚玉砖是石化行业造气炉和反应炉的关键耐火衬里材料。本文介绍了国产刚玉砖及铬刚玉砖的力学性能及其在石化行业气化炉和反应炉上的应用情况。结果表明 ,刚玉砖及铬刚玉砖主要理化性能和使用效果达到或超过同类引进产品 ,完全可以替代进口材料 ,满足了石化行业的生产需要 相似文献
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《Ceramics International》2016,42(13):14765-14773
Al2O3-SiC-SiO2-C refractories are widely used as blast furnace hearth lining but have low oxidation resistance in the presence of CO2. Carbon composite brick is a newly developed Al2O3-SiC-SiO2-C refractory that may function better in the blast furnace hearth due to improved erosion-resistance and high thermal conductivity. In this study, the oxidation behavior and kinetics of carbon composite brick, carbon brick, and corundum brick were investigated in CO2 atmosphere. The results show the oxidation resistance of carbon composite brick was better than that of carbon brick but worse than that of corundum brick. SiC functions as an antioxidant to play an important role in the oxidation process. For carbon composite brick, the oxidation activation energy was 141.72 kJ/mol at the step controlled by the interface reaction and 161.24 kJ/mol at the step controlled by gas diffusion. Carbon composite brick exhibits improved thermal conductivity and oxidation resistance relative to carbon brick and corundum brick that should allow improved performance in blast furnace hearth lining. 相似文献
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陶瓷透水砖是一种经过特殊工艺制成的具有连续孔隙的生态型环保陶瓷砖。采用伟晶石为主要原料,先将伟晶石烧制成高强轻质的陶粒,然后将高强陶粒二次烧结成陶瓷透水砖,所制成的陶瓷透水砖的抗压强度和透水性远高于JC/T945-2005《透水砖》标准要求。 相似文献
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本文从测试温度、荷重大小、垫片种类三个方面分析了测试条件对硅质耐火材料蠕变率测试结果的影响。试验结果表明,应使用铂金垫片,以消除因刚玉垫片与试样接触发生反应而对测量结果带来的误差。 相似文献