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以包覆工艺处理(硫酸钛为前驱体)的氧化铝粉(D_(50)=20μm)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3.69μm,机械强度为57.11 MPa,0.1 MPa气体压力差下的氮气通量为959 m~3/(m~2·h),同时也具有良好的耐化学腐蚀性能。
The high purity alumina ceramic support was prepared at lower temperature (≤1 500 ℃) by using alumina powder (D_ (50) = 20μm) with the coating process (titanium sulfate as precursor) as raw material. The sintering characteristics of coated powder were investigated by means of thermal dilatometer. The phase composition, microstructure and pore size distribution of alumina ceramic support were characterized by X-ray diffraction, scanning electron microscopy, mercury porosimetry and universal testing machine And mechanical strength were characterized. The results show that the coated alumina powder has good sintering activity; the alumina particles are sintered by the solid phase reaction between alumina and titania; the microstructure of the obtained alumina ceramic support is uniform; Of the alumina ceramic support has an open porosity of 33.2%, an average pore size of 3.69 μm, a mechanical strength of 57.11 MPa and a nitrogen flux of 959 m 3 / (m 2 · h) under a pressure difference of 0.1 MPa gas, , But also has good chemical resistance.