Effect of Sodium Silicate Addition Amount on Properties of Porous Diatomite Ceramics
摘 要
以工业硅藻土细粉为原料,以硅酸钠为烧结助剂,采用发泡注凝法在1 000℃保温2 h制备多孔硅藻土陶瓷,研究了硅酸钠添加量(0~5%,质量分数)对陶瓷物相组成、显微结构、气孔孔径和耐压强度的影响。结果表明:随硅酸钠添加量的增加,多孔硅藻土陶瓷中的方石英含量减少,鳞石英含量增加,烧结致密程度增大,气孔孔径呈现减小的趋势,耐压强度增大;当硅酸钠的质量分数为3%时制备得到具有多级孔结构的硅藻土陶瓷,该陶瓷的耐压强度为(1.13±0.08)MPa,比未添加硅酸钠的提高了约113%,其200℃时的热导率仅为(0.098±0.002)W·m-1·K-1。
Abstract
Porous diatomite ceramics were prepared by foam-gelcasting method after holding at 1 000℃ for 2 h with industrial diatomite fine powder as raw material and sodium silicate as sintering aid. The addition amount (0-5wt%) of sodium silicate on the phase composition, microstructure, pore size and compressive strength of the ceramics were investigated. The results show that with increasing addition amount of sodium silicate, the cristobalite content decreased while the tridymite content increased in the porous diatomite ceramics, the sintering densification increased, the pore size showed a decreasing trend, and the compressive strength was improved. When the addition amount of sodium silicate was 3wt%, the diatomite ceramics with a hierarchically pore-structure were obtained; the compressive strength was (1.13±0.08) MPa, which increased by about 113% comparing with that without sodium silicate, and the thermal conductivity at 200℃ was (0.098±0.002) W·m-1·K-1.
中图分类号 TQ174.7 DOI 10.11973/jxgccl201804016
所属栏目 材料性能及应用
基金项目 国家自然科学基金面上项目(51672194);湖北省教育厅高等学校优秀中青年科技创新团队计划项目(T201602);湖北省自然科学基金创新群体项目(2017CFA004)
收稿日期 2017/8/2
修改稿日期 2018/3/12
网络出版日期
作者单位点击查看
备注韩磊(1987-),男,河南驻马店人,博士研究生
引用该论文: HAN Lei,WANG Junkai,DENG Xiangong,GE Shengtao,ZHANG Haijun. Effect of Sodium Silicate Addition Amount on Properties of Porous Diatomite Ceramics[J]. Materials for mechancial engineering, 2018, 42(4): 73~77
韩磊,王军凯,邓先功,葛胜涛,张海军. 硅酸钠添加量对多孔硅藻土陶瓷性能的影响[J]. 机械工程材料, 2018, 42(4): 73~77
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【9】FANG B, KIM J H, KIM M S, et al. Hierarchical nanostructured carbons with meso-macroporosity:Design, characterization, and applications[J]. Accounts of Chemical Research, 2013, 46(7):1397-1406.
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【11】KOCJAN A, SHEN Z. Colloidal processing and partial sintering of high-performance porous zirconia nanoceramics with hierarchical heterogeneities[J]. Journal of the European Ceramic Society, 2013, 33(15/16):3165-3176.
【12】XU B, LI Z. Paraffin/diatomite composite phase change material incorporated cement-based composite for thermal energy storage[J]. Applied Energy, 2013, 105(2):229-237.
【13】ROTTMAN J, PLATT L C, SIERRA-ALVAREZ R, et al. Removal of TiO2 nanoparticles by porous media:Effect of filtration media and water chemistry[J]. Chemical Engineering Journal, 2013, 217:212-220.
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【15】LIN K L, CHANG J C, SHIE J L, et al. Characteristics of porous ceramics produced from waste diatomite and water purification sludge[J]. Environmental Engineering Science, 2012, 29(6):436-446.
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【18】李景华. 焦炉炭化室热补料的制备与性能研究[D]. 济南:济南大学, 2016.
【19】LI C, BIAN C, HAN Y, et al. Mullite whisker reinforced porous anorthite ceramics with low thermal conductivity and high strength[J]. Journal of the European Ceramic Society, 2016, 36(3):761-765.
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