Preparation and properties of high-porosity ZrB2-SiC ceramics by water-based freeze casting
| Autor: | Changling Zhou, Wenbo Han, Zhiming Du, Kai Jiang, Yushi Qi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Composite number 02 engineering and technology Cermet 021001 nanoscience & nanotechnology 01 natural sciences Dispersant Compressive strength Rheology visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material 0210 nano-technology Porosity Shrinkage |
| Zdroj: | Journal of the European Ceramic Society. 41:2239-2246 |
| ISSN: | 0955-2219 |
| Popis: | The development of novel cermet composites based on porous ceramics with high porosity, interconnected pore structure and good mechanical property has attracted considerable attention in engineering application. In this work, water-based freeze casting process was employed to fabricate ZrB2-SiC porous ceramic with aligned lamellar-channels structure using PAA-NH4 as the dispersant. The results revealed that the well-dispersed suspension with best rheological behavior was obtained using 1.0 wt% PAA-NH4 at pH 9. The crack-free porous ceramic exhibited small volume shrinkage ranging from 2.59 % to 1.87 %. By varying the solid loading, the fabricated samples displayed a tailored porosity ranging from 76.12% to 59.37% and an excellent compressive strength of 7 MPa to 78 MPa. After oxidation, the samples displayed a decreased porosity and an increased compressive strength. The ZrB2SiC porous ceramic fabricated in this work will be a promising candidate for the framework of cermet composite. |
| Databáze: | OpenAIRE |
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