601 SPS 法によるハイドロキシアパタイトの低温合成

概要

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Hydroxyapatite (Ca_<10>(PO_4_6(OH_2,HA) is a bioactive material and is synthesized by four kinds of methods. The spark plasma system (SPS) is a promising method to produce advanced materials. Sintering and some chemical reactions are enhanced by SPS. This paper is concerned about the HA synthesis from the mixture of 6CaHPO_42H_2O and 4Ca(OH)_2by SPS. These two compounds are dehydrated under 600℃ and the mixture is turned into the composition of HA. Small crystals of HA were prepared without pressure at 600℃ by heating, but they were decomposed at this temperature for extended times or at higher temperatures. On the other hand, SPS enabled to form stable HA crystals at 600℃, and this growth was based on an effect of SPS. The HA formation was performed at 1000℃ at the high pressure such as 120 MPa. The high pressure of SPS could promote the crystal growth and the stability of HA compared with the decomposition products of HA.
社団法人日本機械学会の論文
2003-10-17