Sintering of translucent alumina
Sintering of translucent alumina
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DOI：
10.1016/j.jmatprotec.2008.10.056
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发表时间：
2009-06
影响因子：
6.3
通讯作者：
Stefan Ma;W. Q. Quek;Q. F. Li;Yong Zhang;J. Fuh;Li Lu
中科院分区：
文献类型：
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作者：
Stefan Ma;W. Q. Quek;Q. F. Li;Yong Zhang;J. Fuh;Li Lu
通过粉末注射成型制备氧化铝（Al2O3）试样，然后在真空条件下分别在1800°C、1850°C和1900°C三个不同温度下烧结30 min以达到期望的半透明水平。制备了不同透光率的Al2O3样品。采用X射线衍射仪（XRD）和扫描电子显微镜（SEM）结合能量色散X射线微分析仪（EDX）对具有理想和不理想透明度的烧结多晶氧化铝样品进行了表征。研究了透明度与显微结构之间的关系。发现不理想的透明度是由于沿晶界沿着存在第二相、孔隙率和孔径范围。还测量了样品的其他性质，如密度、孔隙率和维氏硬度。研究结果表明，在1850 ℃保温30min的条件下，制备半透明氧化铝陶瓷的最佳烧结温度和烧结时间可使氧化铝陶瓷的致密度最高，孔隙率最小。
Alumina (Al2O3) specimens were made via powder injection moulding and then sintered, respectively, at three different temperatures, 1800°C, 1850°C and 1900°C, for 30min in a vacuum condition to achieve a desirable translucent level. The Al2O3samples with different transparency were fabricated. The sintered polycrystalline alumina samples with desirable and undesirable transparency were characterized using an X-ray diffractometer (XRD) and a scanning electron microscope (SEM) attached with an energy dispersive X-ray microanalyzer (EDX). The relationship between the degree of transparency and the microstructure was investigated. It was found that the undesirable transparency was due to the presence of second phase along the grain boundaries, porosity and the range of pore sizes. Other properties of the samples, such as density, porosity, and Vickers hardness, were also measured. The optimum sintering temperature and time, that is 1850°C for 30min, were given for the fabrication of translucent alumina to achieve the highest density and minimum porosity.