耐火材料 ›› 2021, Vol. 55 ›› Issue (4): 283-286.DOI: 10.3969/j.issn.1001-1935.2021.04.002

• 研究开发 • 上一篇    下一篇

以硅溶胶浸渍处理核桃壳粉为造孔剂制备镁质隔热材料

康驰1)(), 李国华1)(), 周晓蕾2), 韩基铄1), 陈树江1), 田琳1)   

  1. 1)辽宁科技大学 材料与冶金学院 辽宁鞍山 114051
    2)辽宁省国家新型原材料基地建设工程中心 辽宁沈阳 110000
  • 收稿日期:2021-01-11 出版日期:2021-08-15 发布日期:2021-08-22
  • 通讯作者: 李国华,女,1976年生,硕士,副教授。E-mail: liguohuagui97@163.com
  • 作者简介:康驰:男,1998年生,硕士研究生。E-mail: kangchicailiao20@163.com
  • 基金资助:
    国家重点研发计划项目(2017YFB0310701)

Preparation of magnesia insulation materials by walnut shell powder impregnated with silica sol

Kang Chi1)(), Li Guohua1)(), Zhou Xiaolei2), Han Jishuo1), Chen Shujiang1), Tian Lin1)   

  1. 1)School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China
  • Received:2021-01-11 Online:2021-08-15 Published:2021-08-22
  • Contact: Li Guohua

摘要:

为了减少高温窑炉的热能损耗,降低窑体的表面温度,以自制的镁质多孔骨料(以高纯镁粉为原料,以油酸钾为发泡剂)、中档镁砂粉、铝酸钙水泥、SiO2微粉为原料,引入硅溶胶处理后的核桃壳粉(以Sws表示)作为造孔剂,制备镁质隔热材料试样。研究了Sws的加入量(质量分数分别为0、10%、15%和20%)和烧结温度(1 300、1 350、1 400和1 480 ℃)对试样性能的影响。结果表明:1)1 480 ℃时添加Sws为10%(w)时,试样耐压强度为22 MPa;添加Sws为20%(w)时,热导率为0.368 W·m-1·K-1 (350 ℃)。2)硅溶胶中的纳米SiO2与基质内的MgO反应生成镁橄榄石,将核桃壳粉挥发后的气孔包裹起来,形成封闭气孔。

关键词: 发泡法, 烧失法, 硅溶胶浸渍处理核桃壳粉, 镁质多孔骨料, 镁质隔热材料

Abstract:

In order to reduce the thermal energy loss of high temperature kilns and furnaces and lower the surface temperature of the kiln body,magnesia insulation materials were prepared using self-made magnesia porous aggregates (using high purity magnesia powder as starting material and potassium oleate as foaming agent),middle grade magnesia powder,calcium aluminate cement,and SiO2 micropowder as starting materials,introducing walnut shell powder impregnated with silica sol (short for Sws) as a pore-making agent.The effect of the Sws addition (0,10%,15%,and 20%) and the sintering temperature (1 300,1 350,1 400,and 1 480 ℃) on the properties of magnesia insulation materials was studied.The results show that (1)when the Sws addition is 10 mass%,the compressive strength is 22 MPa;when the Sws addition is 20%,the thermal conductivity is 0.368 W·m-1·K-1(350 ℃);(2)nano-silica in the silica sol reacts with MgO in the matrix to form forsterite,which encapsulates the pores volatilized from the walnut shell powder and forms closed pores.

Key words: foaming method, ignition loss method, walnut shell powder impregnated with silica sol, magnesia porous aggregates, magnesia insulation materials

中图分类号: