| Autor: |
Rao, R. Ramachandra, Kannan, T. S. |
| Zdroj: |
Transactions of the Indian Ceramic Society; January 1999, Vol. 58 Issue: 3 p64-68, 5p |
| Abstrakt: |
Hydroxyapatite (HAP) has been synthesised in the presence of A12O3and ZrO2additives by solid state reaction between tricalcium phosphate (TCP) and Ca(OH)2at 1000°C/8 h. The doping by A12O3and ZrO2resulted in the formation of CaAl2O4and t-ZrO2as the secondary phases by partial consumption of CaO which in turn leads to the appearance of β-TCP along with HAP. The amount of HAP in the product is further reduced due to decomposition into β-TCP and CaO when these powder products are pelletised and sintered at 1300°C for 2 h. While in Al2O3doped samples, CaO after reaction with A12O3and/or CaAl2O4results in the formation of CaAl2O4and/or CaAl407, in ZrO2doped samples t-ZrO2and CaZrO3are formed by solid-solution of CaO into ZrO2. The products will have lower density as compared to pure HAP without additives owing to the differential shrinkage between the various phases present in the product. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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