Sinterability of β-Calcium Orthophosphate Powder Prepared by Spray-Pyrolysis |
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| Authors: | Kiyoshi Itatani Toshio Nishioka Satoru Seike F Scott Howell Akira Kishioka Makio Kinoshita |
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| Affiliation: | Department of Chemistry, Faculty of Science and Engineering, Sophia University, 7-1 Kioi-cho Chiyoda-ku, Tokyo 102, Japan |
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| Abstract: | Mixed solutions of Ca(NO3)2 and (NH4)2HPO4 with Ca/P = 1.50 were spray-pyrolyzed at 600°C to produce β-calcium orthophosphate (β-Ca3(PO4)2) powder; the spray-pyrolyzed powder was ground and then calcined at 600°C for 1 h. The best crystalline β-Ca3(PO4)2 powder was obtained from the solution with 1.80 mol.L–1 Ca(NO3)2, 1.20 mol.L–1 (NH4)2HPO4. The resulting powder was composed of primary particles with sizes of <0.5 μm. Dense β-Ca3(PO4)2 ceramics with a relative density of 96.1% could be fabricated by firing this compressed powder at 1070°C for 5 h. |
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