刚玉质微孔耐火材料的制备及性能

硅酸盐学报

・ 422 ・2013年

DOI：10.7521/j.issn.0454–5648.2013.03.25

刚玉质微孔耐火材料的制备及性能

朱伯铨，魏国平，李享成，宋雅楠

(武汉科技大学，耐火材料与高温陶瓷国家重点实验室培育基地，武汉 430081)

摘要：以板状刚玉骨料(粒度为0.088～1.000mm)及细粉(粒度分别为0.045～0.088mm和小于0.045mm)、活性α-Al2O3微粉(d50=1.75μm)和ρ-Al2O3微粉(d50=1.5μm)为主要原料，采用浇注成型工艺制备刚玉质微孔耐火材料。研究了纳米Al2O3添加量(其质量分数分别为0、0.5%、1.0%和1.5%)对刚玉质微孔耐火材料常规物理性能和高温热导率的影响。结果表明：随纳米Al2O3添加量增加，样品的体积密度、常温耐压强度和常温抗折强度均逐渐增大，显气孔率逐渐减小。纳米Al2O3的引入在一定程度上起到细化气孔的作用。随纳米Al2O3添加量增加，样品气孔的体积中位径由0.90μm降低到0.68μm；样品的弹性模量逐渐下降，且气孔的体积中位径与样品的弹性模量间有较高的线性相关性；样品在300～1000℃的热导率逐渐下降：300℃时的热导率从0.627W/(m·K)降低到0.200W/(m·K)，1000℃时的热导率从1.029W/(m·K)降低到0.778W/(m·K)。

关键词：刚玉；纳米氧化铝；微孔；热导率；弹性模量

中图分类号：TQ175.1 文献标志码：A 文章编号：0454–5648(2013)03–0422–05

网络出版时间：网络出版地址：

Preparation and Properties of Corundum Based Microporous Refractory

ZHU Boquan，WEI Guoping，LI Xiangcheng，SONG Yanan

(The State Key Laboratory Cultivation Base of Refractories and Ceramics, Wuhan University of

Science and Technology, Wuhan 430081, China)

Abstract: A series of corundum based microporous refractories were prepared via casting process with tabular alumina aggregates

(0.088–1.000mm) and fine powders (0.045–0.088mm and <0.045mm, respectively), reactive α-Al2O3 micro-sized powder (d50=

1.75μm) and ρ-Al2O3 micro-sized powder (d50=1.5μm) as starting materials. The influence of nano-Al2O3 addition (0, 0.5%, 1.0% and 1.5% in mass) on the physical properties and thermal conductivity of corundum based microporous refractory was investigated. The results show that the bulk density, compressive strength and bending strength of specimens increase, and the apparent porosity decreases gradually with the increase of addition of Al2O3 nano-particles. It was found that the pore size of specimens reduced due to the addition of Al2O3 nano-particles. With the increase of nano-Al2O3 addition, the median pore size of the specimens decreased from 0.90μm to 0.68μm, the thermal conductivity at 300–1000℃ and the modulus of elasticity of specimens both also decreased , and their thermal conductivities dereased from 0.627W/(m·K) to 0.200W/(m·K) (at 300℃) and from 1.029W/(m·K) to 0.778W/(m·K) (at 1000℃), respectively. In addition, a linear correlation between the medium pore size and the elastic modulus of specimens was proposed.

Key words: corundum; nano-alumina; micropore; thermal conductivity; elastic modulus

传统隔热耐火材料的强度、抗侵蚀能力和耐磨性均较差，一般不直接用做工作面，而是放在工作面后面作为保温层，但隔热耐火材料越靠近工作面，它的隔热节能效果越好。随着对节能降耗要求的提高，对于能在工作面直接使用的高强度、耐高温、抗侵蚀隔热耐火材料的开发研究日益受到人们的重视[1]。对材料中的气孔进行微细化结构设计有望成为开发该种材料的重要途径之一。朱伯铨等在对致密刚玉质浇注料气孔孔径分布的研究时发现：浇注料中的微细气孔不仅与浇注料强度间具有很高的相关性[2–3]，而且对浇注料热导率的影响十分显著[4]；在保持浇注料显气孔率不变的条件下，适当提高材料中微孔的比例能显著提高材料的强度，降低材料的热导率。宋木森等[5]研究表明：当耐火材料中气

收稿日期：2012–08–28。修订日期：2012–11–28。

基金项目：国家“973”计划(2012CB722702)；湖北省自然科学基金重点项目(2010CDA028)资助。

第一作者：朱伯铨(1955—)，男，教授。Received date:2012–08–28. Revised date: 2012–11–28. First author: ZHU Boquan (1955–), male, Professor.

E-mail: zbqref@

第41卷第3期2013年3月

硅酸盐学报

JOURNAL OF THE CHINESE CERAMIC SOCIETY

Vol. 41，No. 3

March，2013

2013-02-28 11:08/kcms/detail/11.2310.TQ.20130228.1108.201303.422_025.html