Effects of Preparation Conditions in Aqueous Solution on Properties of Hydroxyapatites

Kunio Ishikawa, Masayuki Kon, Norihiko Kuwayama, Satoru Tenshin

研究成果: ジャーナルへの寄稿記事

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Hydroxyapatite powders (HAP: Ca10(PO4)6(OH)2) were prepared from calcium nitrate and di-ammonium hydrogen phosphate at various temperatures in aqueous solution in the absence and presence of carbon dioxide. In the absence of carbon dioxide, the crystallinities as well as the calcium to phosphate ratio (Ca/P ratio) of HAP powders increased with an increase in the preparation temperature. Calcium ion deficiency caused low Ca/P ratios of HAP powders. Such HAP powders decomposed thermally to α-tricalcium phosphate (α-TCP : Ca3(PO4)2) at 800 °C in 3 hours whereas HAP powders with sufficient calcium were stable at 1200 °C for 3 hours. In the presence of carbon dioxide as well the crystallinities of HAP powders increased with an increase in the preparation temperature, but carbonate-bearing HAPs were obtained instead of pure HAP. In addition, calcium carbonate was obtained along with carbonate-bearing HAP prepared below 60 °C.

元の言語英語
ページ(範囲)58-69123
ページ数69066
ジャーナルdental materials journal
9
発行部数1
DOI
出版物ステータス出版済み - 1 1 1990
外部発表Yes

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Dentistry(all)

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