期刊
CERAMICS INTERNATIONAL
卷 43, 期 6, 页码 5108-5114出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.01.024
关键词
Alumina; Coarse powder; Sintering; Low-temperature; Mechanical strength
资金
- Project of Public Welfare Research and Ability Building of Guangdong Province [2015B010105009]
- Science and Technology Program of Guangzhou [201300000126]
- China Postdoctoral Science Foundation [2016M590760]
Coarse alumina powder compacts doped with various amounts of titania and copper oxide were pressurelessly sintered from 900 degrees C to 1600 degrees C. Their phase assemblages and microstructural evolution, as well as their properties, were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry/thermogravimetric (DSC/TG) analysis, and three-point bending and wetting test. The role of TiO2 and CuO during the sintering is discussed in detail. The experimental results show that the liquid phase from the copper oxide appeared at approximately 1200 degrees C, so the solid-state reaction between alumina and titania took place at a lower temperature. Such solid state-reaction sintering had a strong impact on the grain growth and greatly promoted the densification of the alumina compact. In addition, the liquid phase inhibited the abnormal grain growth and microcracking. As a result, the coarse alumina powder compacts doped with 5 wt% TiO2 CuO were fully densified and exhibited sufficient flexural strength (342 21 MPa) when sintered at a temperature of 1450 degrees C for 2 h.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据