共查询到18条相似文献,搜索用时 150 毫秒
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采用真空抽滤成型和非烧结低温固化工艺,以硅酸铝陶瓷纤维、硅溶胶、羧甲基纤维素为主要原料,制备了陶瓷纤维多孔过滤材料。研究了原料配比和工艺参数对材料性能的影响。结果表明:最佳配方比例为陶瓷纤维2.5wt%,硅溶胶50wt%,水 47wt%,羧甲基纤维素0.5wt%,在抽滤时间为5 min,固化温度为150℃的条件下﹐可获得非烧结陶瓷纤维多孔过滤材料,其气孔率、抗折强度和压降分别为80.22%、1.83 MPa和 130 Pa。该制备方法为工业化生产高温烟气过滤材料提供了新的选择。 相似文献
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本文以多晶莫来石纤维、SiO2/B2O3体系结合剂为主要原料,采用真空旋转抽滤成
型工艺,制备了高温陶瓷纤维膜材料,研究了浆料性能、结合剂加入量、成型压力对陶瓷纤维
膜材料各项性能的影响。实验结果表明:浆料粘度、结合剂量及成型压力对纤维膜材料的性能
有显著影响。当浆料的粘度为 2000 mPa?s ~ 2500 mPa?s、结合剂含量为 39 wt% ~ 42 wt%、成型
压力为 ?0.04 MPa 时,可获得均匀结构的陶瓷纤维过滤材料。材料气孔率大于 88%,透气阻力
为 82 Pa,抗压强度为 1.75 MPa,可几孔径为 90 μm。 相似文献
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本文采用真空旋转抽滤成型工艺,以莫来石纤维为主要原料制备了高温气体净化
用陶瓷纤维过滤材料,研究了纤维浆料搅拌时间和烧结温度对纤维膜材料性能的影响,评价其
过滤及热震性能。实验结果表明:当纤维膜浆料搅拌 2 h 时,在 1000?C 下烧结可以制备出过抗
压强度为 4.75 MPa、透气阻力 95 Pa、气孔率为 85%、平均孔径为 70 ?m、显微结构均匀的纤维
膜材料,其除尘效率可达 99.99%,且具有良好的热震性能。 相似文献
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《中国陶瓷》2017,(7)
采用无机陶瓷纤维制备气固分离膜,利用短长径比的纤维在支撑体上制备过滤膜层,对膜层的过滤阻力、滤后空气含尘量以及反吹再生性能等进行测试。经对比发现,采用长径比为8~14的硅酸铝纤维制成的过滤膜性能最佳。在1 m/min的过滤风速下该膜层的初始阻力为108 Pa,经0.6 MPa的气压循环反吹300次后的平衡阻力为145 Pa,滤后空气含尘量为195μg/m~3。对0.03~0.06 MPa的反吹压力清灰后的平衡阻力进行了测试,0.06 MPa的反吹压力下平衡阻力为146 Pa,与0.6 MPa反吹后的平衡阻力相仿,所以反吹压力≥0.06 MPa时即可达到最佳反吹效果。 相似文献
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详细说明了用网状弹性聚氨基甲酸乙脂切片浸渍陶瓷料浆研制AS型泡沫陶瓷过滤器的工艺。采用非磷酸盐添加剂粘合,由碳化硅、氧化铝、硅胶及少量硅酸铝纤维制成的AS型泡沫陶瓷过滤器抗压强度可达1.65MPa而厚度仅为15mm,并且不会造成环境污染,完全可以满足过滤铁熔液的要求。 相似文献
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分别以硅酸铝纤维和玻璃纤维为骨架材料,采用溶胶-凝胶、常压干燥制得纤维复合二氧化硅气凝胶材料,并对材料进行了结构和性能的测试分析。结果表明,二氧化硅气凝胶附着于纤维表面,提高了材料力学强度。硅酸铝纤维复合二氧化硅气凝胶材料的隔音性能优于玻璃纤维复合二氧化硅气凝胶材料。两种纤维复合二氧化硅气凝胶材料耐高温、燃烧性能均达到A级。硅酸铝纤维复合二氧化硅气凝胶材料和玻璃纤维复合二氧化硅气凝胶材料的产烟毒性分别为AQ1级和AQ2级,导热系数分别为0.034 W/(m·K)和0.033 W/(m·K)。 相似文献
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在25.0℃及搅拌条件下,采用等温热导微量热法研究了硅溶胶与硅酸钾的混合过程。结果表明,硅溶胶与硅酸钾混合,立刻发生了SiO2溶解和复杂的化学反应,并产生了完全不同于硅溶胶和硅酸钾的SiO2胶体粒子和化学成分以及热效应,热效应受硅溶胶所占的相对重量百分比的影响。其反应的特征是硅溶胶和硅酸钾的反应级数从低到高时刻都在快速不断交替变化;随着硅溶胶所占比例的提高,热谱曲线峰高、硅溶胶与硅酸钾的混合化学反应完全的曲线总面积(总焓变QT)和热力学焓变(ΔH)数值都表现出不断增大的趋势。 相似文献
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Xuesong Li Yuanbing Li Shujing Li Zhipeng Wei Ruofei Xiang 《International Journal of Applied Ceramic Technology》2020,17(5):2465-2472
To improve the mechanical and thermal insulation properties of lightweight alumina, which was prepared by using pore-forming agent from biological sources, the silica sol-infiltrated corn stalk was utilized. Spring back and hygroscopicity of corn stalk powder as well as cold compressive strength, thermal conductivity, microstructure, and pore size distribution of lightweight alumina were characterized. The results indicate that impregnation of silica sol leads to different degrees of decrease in spring back height due to achieving better mesh by silica gel between the corn stalk powders, and then improves the formability, although at the same time the large number of hydrophilic groups results in an increase in hygroscopicity. Furthermore, sol impregnated pore-forming agent optimizes the microstructure of the lightweight alumina pores. Lightweight alumina with a cold compressive strength up to 48.64 MPa was produced, and with the silica sol concentration of 3 wt%, lower thermal conductivity values at all test temperatures were obtained. Hence, the use of corn stalk impregnated with the appropriate concentration of silica sol as pore-forming agent could enhance the mechanical and thermal insulation properties of lightweight alumina for the spheroidization of pore shape, randomization of pore distribution as well as miniaturization of pore size. 相似文献
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《Ceramics International》2016,42(11):12937-12945
Development of high pure alumina castable is studied by using synthesized mullite sol as the sole binder. Mullite sol is prepared by wet chemical route and is characterized by its solid content, particle size, thermal analysis, phase development with temperature, microstructure, etc. This sol is used at two different percentages in high alumina castable compositions with two different particle size distribution patterns. Conventional castable processing is done on the compositions and the characterizations are done after heat treatment at three different temperatures. Finally, the best composition is also compared with the commercially available silica sol containing high alumina castable with similar particle size distribution. Considerably improved hot strength, high corrosion resistance and flexural strength (hot modulus of rupture) are obtained for the mullite sol containing composition but with relatively lower thermal shock resistance. 相似文献
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《Ceramics International》2017,43(12):8850-8857
Silica sol bonded castables have obvious advantages over low cement or hydratable alumina bonded castables in drying performance and sintering properties for SiC castables. However, they are not widely used due to their weak strength at low temperature. The efficiency of bonding network for silica sol bonded SiC castable in the presence of different reactive micropowder such as SiO2 micropowder and α-Al2O3 micropowder was evaluated through oscillatory tests, sintered properties and microstructural analysis. Results show that the polymerization reaction between SiO2 micropowders enhanced the siloxane network and reinforced the bonding strength, furthermore, the addition of α-Al2O3 micropowder contributed to accelerating the formation of the siloxane network and hardening of the silica sol at lower temperatures and shorter time. Silica sol performed well as a binder agent for SiC castables with an addition content of 3 wt% SiO2 micropowder and 2 wt% α-Al2O3 micropowder, which showed high strength and good workability at room temperature. And Silica sol bonded SiC castable with the above micropowder contents possessed the best mechanical behavior after heat treatment due to combined binding of SiC whiskers and mullite. 相似文献
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Dispersion properties of alumina powders in silica sol 总被引:2,自引:0,他引:2
Xinwen Zhu Dongliang Jiang Shouhong Tan Zhaoquan Zhang 《Journal of the European Ceramic Society》2001,21(16):2879-2885
The dispersion of alumina powders in silica sol has been investigated by zeta potential, sedimentation, and rheological measurements. Zeta potential of alumina in silica sol changes significantly in comparison with that of alumina in deionized water. This is caused by the absorption of silica colloidal particles with negative charge on the surface of alumina particles. Sol-dispersed alumina slurry shows a minimum in sedimentation volume and viscosity around pH 10. The viscosity depends strongly on the silica sol concentration and reaches a minimum in 10–15 wt.% silica sols. It is proposed that the dispersion and stabilization of alumina particles in silica sol are attributed to the electrostatic and steric effects of the colloidal particles absorption. Effects of pH, solids content and silica sol concentration on the rheological behavior of sol-dispersed alumina slurries are discussed in detail. 相似文献