硅酸盐学报

低温制备高纯氧化铝陶瓷支撑体

单位：1. 中国钢研科技集团有限公司新冶集团北京 100081 2. 清华大学材料学院北京 100084

分类号：TQ174

出版年,卷(期):页码：2017,45(6):817-822

DOI：10.14062/j.issn.0454-5648.2017.06.10

摘要：

以包覆工艺处理(硫酸钛为前驱体)的氧化铝粉(D50=20 μm)为原料，在较低温度下(≤1 500 ℃)实现了高纯氧化铝陶瓷支撑体的制备。采用热膨胀仪对包覆粉体的烧结特性进行了研究，采用X射线衍射仪、扫描电子显微镜、压汞仪、万能试验机对氧化铝陶瓷支撑体的物相组成、显微结构、孔径尺寸分布及机械强度进行了表征。结果表明，包覆的氧化铝粉体具有良好的烧结活性；氧化铝颗粒之间依靠氧化铝与二氧化钛固相反应实现烧结；所得氧化铝陶瓷支撑体的显微结构均匀；在 1 400 ℃制备得到的氧化铝陶瓷支撑体的开口气孔率为33.2%，平均孔径尺寸为3.69 μm，机械强度为57.11 MPa，0.1 MPa气体压力差下的氮气通量为959 m3/(m2·h)，同时也具有良好的耐化学腐蚀性能。

Alumina ceramic supports were fabricated at a low temperature (≤1 500 ℃) using a Ti(SiO4)2 coated alumina powder with the median size of 20 μm as a starting material. The sintering characteristic was determined by a thermal expansion instrument. The phase composition, micro-structure, pore size distribution and flexural strength were characterized by scanning electron microscopy, scanning electron microscopy, mercury porosimetry and universal mechanical test, respectively. The results indicate that the coated alumina powder exhibits the excellent sintering activity. The sintering process of alumina particles was realized via solid state reaction between alumina and titania. The obtained supports show a homogeneous micro-structure. The alumina ceramic supports prepared at 1 400 ℃ have an open porosity of 33.2% , average pore size of 3.69 μm, mechanical strength of 57.11 MPa and nitrogen gas flux of 959 m3/(m2·h) under a trans-membrane pressure of 0.1 MPa, and they also exhibit the excellent chemical resistance.

基金项目：

作者简介：

王峰(1983—)，男，博士。

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