耐火材料 ›› 2022, Vol. 56 ›› Issue (1): 10-15.DOI: 10.3969/j.issn.1001-1935.2022.01.003

• 研究开发 • 上一篇    下一篇

利用核桃壳的形态结构优化Al2O3多孔材料的孔结构和性能

胡娇娇1)(), 李淑静1,2), 李远兵1,2), 魏志鹏3), 陈攀1), 王佳宁1)   

  1. 1)武汉科技大学 省部共建耐火材料与冶金国家重点实验室 湖北武汉 430081
    2)武汉科技大学 高温材料与炉衬技术国家地方联合工程研究中心 湖北武汉 430081
    3)杭州永特信息技术有限公司 浙江杭州 310000
  • 收稿日期:2021-03-12 出版日期:2022-02-15 发布日期:2022-02-24
  • 作者简介:胡娇娇:女,1995年生,硕士研究生。E-mail: 1058553518@qq.com
  • 基金资助:
    国家自然科学基金项目资助(51772221)

Optimization of pore structure and properties of porous Al2O3 materials utilizing morphology of walnut shell

Hu Jiaojiao1)(), Li Shujing1,2), Li Yuanbing1,2), Wei Zhipeng3), Chen Pan1), Wang Jianing1)   

  1. 1)The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China
  • Received:2021-03-12 Online:2022-02-15 Published:2022-02-24

摘要:

首先将质量分数为5%的ZrO2溶胶、7%的Al2O3溶胶、3%的SiO2溶胶作为浸渍试剂对核桃壳粉(WSP)浸渍处理。然后以α-Al2O3微粉为主原料,以处理后的WSP为造孔剂,制备了Al2O3多孔材料。研究了溶胶浸渍处理后WSP对多孔材料孔结构、热导率和力学性能的影响。结果表明,在Al2O3多孔材料的孔中可以清楚地观察到WSP的形变,这是优化陶瓷孔结构的重要因素。通过使用质量分数为3%的SiO2溶胶浸渍处理的WSP,可以获得低热导率(200 ℃,0.297 W·m -1·K -1)和高耐压强度 (43.5 MPa)的Al2O3多孔材料,并在孔中发现了莫来石的交叉网络结构。

关键词: Al2O3多孔材料, 形态结构, 核桃壳粉, 溶胶浸渍, 热导率, 耐压强度

Abstract:

First,walnut shell powder (WSP) was impregnated with different impregnating reagents:5% ZrO2 sol,7% Al2O3 sol,and 3% SiO2 sol.Then,porous Al2O3 materials were prepared using α-Al2O3 micropowder as the main starting material and the treated WSP as the pore forming agent.The effects of the sol impregnated WSP on the pore structure,the thermal conductivity and the mechanical properties of the porous Al2O3 materials were investigated.The results show that the morphological changes of WSP are clearly observed in the pores of the porous Al2O3 materials,which is an important factor in optimizing the pore structure of ceramics.Porous Al2O3 ceramics of low thermal conductivity (0.297 W·m -1·K -1 at 200 ℃) and high compressive strength (43.5 MPa) can be obtained adopting the WSP impregnated with 3% SiO2 sol.Furthermore,mullite cross network structure is also found in the pores of the material.

Key words: porous alumina ceramics, morphological structure, walnut shell powder, sol-impregnation, thermal conductivity, compressive strength

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