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Micro-Porosity and Properties of Light-Weight Insulation Refractories Based on Calcined Flint Clay
Transactions of the Indian Ceramic Society ( IF 1.2 ) Pub Date : 2019-01-02 , DOI: 10.1080/0371750x.2019.1566023
Jianbo Liu 1 , Yuanbing Li 1, 2 , Shujing Li 1, 2 , Nana Xu 1 , Ruofei Xiang 1 , Qingheng Wang 1
Affiliation  

ABSTRACT In this study, light-weight insulation materials were prepared with calcined flint clay as the main material and sawdust was infused by sols as a pore forming agent. Micro-porosity and properties of the prepared insulation materials were investigated and were found to have better comprehensive properties. Apparent porosity, bulk density and cold crushing strength of the compositions containing 40 wt% calcined flint clay, fired at 1400°C for 3 h, were found to be 71%, 0.85 g.cm–3 and 2.65 MPa, respectively. Thermal conductivity of the material was 0.133 W.m–1.K –1 at 300°C. When sawdust was soaked by 0 wt% sol, microstructure of the materials showed irregular pores. When sawdust was infused with 7 wt% alumina sol, the micropores were wrapped with larger pore. Meanwhile, the original pore was refined, and cold crushing strength and thermal conductivity were also optimized. When the sawdust was soaked in alumina sol, the cold crushing strength increased to 3.3 MPa and the thermal conductivity decreased to 0.116 W.m–1·K–1 at 300°C. Grey correlation method indicated that the pore size of <2 µm, 2-6 µm and 18-26 µm had more significant influence on cold crushing strength and thermal conductivity. GRAPHICAL ABSTRACT

中文翻译:

煅烧火石质轻质隔热耐火材料的微孔率及性能

摘要 在本研究中,以煅烧燧石为主要材料,以溶胶为成孔剂注入锯末制备轻质保温材料。对制备的绝缘材料的微孔率和性能进行了研究,发现其具有较好的综合性能。含有 40 wt% 煅烧火石粘土的组合物的表观孔隙率、堆积密度和冷压强度,在 1400°C 下烧制 3 小时,分别为 71%、0.85 g.cm-3 和 2.65 MPa。该材料在 300°C 时的热导率为 0.133 Wm–1.K –1。当木屑被 0 wt% 的溶胶浸泡时,材料的微观结构显示出不规则的孔隙。当锯末注入 7 wt% 的氧化铝溶胶时,微孔被更大的孔包裹。同时,细化原本的毛孔,冷抗压强度和热导率也进行了优化。当锯末浸泡在氧化铝溶胶中时,冷压强度增加到 3.3 MPa,热导率在 300°C 下降低到 0.116 Wm-1·K-1。灰色关联法表明,孔径<2 µm、2-6 µm和18-26 µm对冷抗压强度和导热系数的影响更为显着。图形概要
更新日期:2019-01-02
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