Sintering behavior of fluorapatite-based composites produced from natural phosphate and alumina
| Autor: | A. Kenzour, D. Kherifi, S. Djouallah, H. Belhouchet |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Boehmite Materials science Process Chemistry and Technology Fluorapatite Sintering 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Phosphate 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Grossite chemistry.chemical_compound chemistry Phase (matter) 0103 physical sciences Materials Chemistry Ceramics and Composites engineering Hibonite Composite material 0210 nano-technology Porosity |
| Zdroj: | Ceramics International. 47:3553-3564 |
| ISSN: | 0272-8842 |
| Popis: | In this investigation, we studied the reaction-sintering between fluorapatite and alumina using natural phosphate and boehmite. The addition of alumina, resulting from the boehmite transitions, to the fluorapatite (FAp) has been carried out to obtain various composites based on FAp, yeelemite, mayenite, grossite (CA2), hibonite (CA6) and β-TCP. Several samples were prepared by varying the boehmite (AlOOH) amount to obtain six compositions which contain after sintering: 5, 10, 15, 20, 25 and 30 wt% of Al2O3. After ball-milling for 5 h, all compositions were sintered in the air for 2 h at different temperatures ranging from 1000 to 1500 °C. The reactions and phase transformations between fluorapatite and boehmite were studied and characterized by DTA/TG, XRD, FT-IR, apparent density and open porosity measurements, micro-hardness and SEM analysis. The micro-hardness and densification of the sintered body showed a marked improvement by increasing the alumina content and sintering temperature. Especially, sample containing 25% alumina exhibited the highest densification at 1400 °C (2.95 g/cm3) and excellent micro-hardness of about 6.5 ± 0.25 GPa. So the preparation of low cost composites based on fluorapatite, yeelimite and grossite from natural phosphate and alumina are feasible. |
| Databáze: | OpenAIRE |
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