Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440831 | Journal of the European Ceramic Society | 2016 | 5 Pages |
Abstract
In order to increase the in-line transmission of fine transparent alumina in visible light the grain growth during sintering of alumina ceramics was supressed using a combined densification process. This process combines presintering of a green body by spark plasma sintering with final hot isostatic pressing. The presintering by spark plasma sintering provided bodies with a substantially smaller grain size than pressureless presintering. It is shown that the fine-grained presintered microstructure could be retained during final hot isostatic pressing and alumina ceramics doped with spinel and zirconia nanoparticles in particular could be sintered to full density with only minor grain growth during final hot isostatic pressing. The novel combined densification process enhanced by the unique nanoparticle doping approach provided fully dense alumina ceramics with an average grain size of 237Â nm and an in-line transmission of 76.2% at a wavelength of 632.8Â nm and a sample thickness of 0.8Â mm.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Martin Trunec, Jens Klimke, Zhijian James Shen,