Influence of calendering on the properties of paper-derived alumina ceramics
详细信息 查看全文
- 作者：Tobias Schlordt ; Benjamin Dermeik ; Veronika Beil ; Matthias Freihart ; Andreas Hofenauer ; Nahum Travitzky ; Peter Greil
- 关键词：B ; Porosity ; B ; Surfaces ; C ; Mechanical properties ; Preceramic paper
- 刊名：Ceramics International
- 出版年：April, 2014
- 年：2014
- 卷：40
- 期：3
- 页码：4917-4926
- 全文大小：2129 K
文摘
The effect of calendering of alumina loaded preceramic papers in a hard nip laboratory calender at various temperatures, line loads and times of nip passes on their green and sintered properties was investigated. The main objective was to achieve a maximum densification, which resulted in a maximum reduction of thickness of 45%, a green density of 80.5% of the theoretical density and a sintered density of 81% of the theoretical density. The ring-on-ring flexural strength of sintered specimen could be increased from 71卤11 MPa to 138卤33 MPa. The surface roughness of green samples could be diminished to a value for Ra of below 2 碌m compared to an Ra of 13.2 碌m for an uncalendered paper, whereas the Ra value of the sintered samples was much higher due to the burn-off of the cellulose fibers. Preceramic papers manufactured by the dynamic hand-sheet-forming process exhibit a fiber-orientation which causes anisotropic effects regarding the sintering shrinkage, the surface roughness and Young's modulus.