Anisotropic grain growth of Al2TiO5/Al2O3 ceramic composite

被引：0

作者：

Cui, Xu ^{[1
]}

Chen, Xiao-Hu ^{[1
]}

机构：

[1] Institute of Materials Physical Chemistry, Huaqiao University, Quanzhou 362021, China

来源：

Rengong Jingti Xuebao/Journal of Synthetic Crystals | 2010年 / 39卷 / 04期

关键词：

Grain growth - Sintering - Energy dispersive spectroscopy - Grain boundaries - Scanning electron microscopy - Anisotropy - Aspect ratio - Ceramic materials - Aluminum oxide - Chemical activation - Temperature - X ray diffraction;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Al2TiO5/Al2O3 ceramic composite with the mole ratio of 1:4 was prepared by mechanical activation. The grain growth of Al2TiO5/Al2O3 ceramic composite at different temperature was studied by X-ray diffraction(XRD), scanning electron microscope(SEM) and X-ray energy dispersive spectroscopy(EDS). The XRD patterns indicated that the primary crystalline phases of sintered samples are α-Al2O3 and Al2TiO5. The SEM observations and EDS microanalysis revealed that Al2TiO5 develope an anisotropic microstructure at low temperature (1350°C). As the temperature up to 1450°C, Al2TiO5 started to grow anisotropically and rod-like grains were developed. The aspect ratio of Al2TiO5 continued to increase with temperature increasing to 1500°C. But Al2O3 grains were always equiaxed and platelet. Rod-like Al2TiO5 with anisotropic growth located mainly at alumina triple points and grain boundaries. According to this study, increasing sintering temperature could enhance anisotropic growth and increase the volume fraction of anisotropic growth grains. Because Al2TiO5 would inhibit the further growth of Al2O3 matrix grains, which resulted in the stagnation of Al2O3′s grain growth, while the average grain sizes of Al2TiO5 increased with the increasing of sintering temperature.

引用

页码：982 / 987