检索结果-南通市图书馆

High toughness alumina ceramics with elongated grains developed from seeds

Science China(Technological Sciences) 2003年第5期46卷 527-536页

作者：谢志鹏高立春李文超徐利华王习东 Department of Materials Science and Engineering Tsinghua University Beijing 100084 China University of Science and Technology Beijing Beijing 100083 China

In the present paper, the influence of α-AI_2Ol_3 seeds and sinteringmethods on elongated grain growth and fracture toughness is investigated. The preparation of aluminaceramics started with commercial aluminum hydroxide. Abrasives were introduced to the startingmaterials by wet-grinding of high-purity alumina milling balls. Abrasives, playing the role ofseeds, lowered the transformation temperature of aluminum hydroxide to alumina. Microstructures withelongated grains were developed by hot-pressing for the above calcined powders containingα-AI_2O_3 seeds, and alumina grain shapes changed with the amount of seeds introduced. However,only equiaxed grains were observed for the samples pressureless sintered. Fracture toughness of thealumina ceramics was dramatically improved by elongated grains. For the sample hot-pressed at 1600℃for 2 h under 40 MPa pressure, fracture toughness reached 7.1 MPa·m^(1/2), which is much higherthan that of normal alumina ceramics without elongated grains. In addition, high flexural strengthof 630 MPa for the hot-pressed samples was also obtained.

关键词： alumina elongated grains, α-Al2O3 seeds, aluminum hydroxide, fracture toughness.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：