Thermochemical gypsum conversion forming calcium phosphates
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A study was carried out on effect of the conditions of physicochemical conversion of a porous gypsum intermediate product to calcium phosphates. Depending on the initial conditions of sample preparation, the materials around hydroxyapatite and dicalcium phosphate were obtained. The conducted thermal analysis and dilatometric studies made it possible to propose the conditions of thermal treatment preventing shrinkage and deformation of samples. After thermal treatment at 1000°C, fine crystalline porous materials were obtained with crystal size between 0.5 and 2 μm and pore size up to 50 μm on the basis of β-tricalcium phosphate with strength up to 2.8 MPa. The developed pore structure and fairly high strength make it possible to use the developed materials based on tricalcium phosphate to obtain biomaterials for the replacement of defects in bone tissue.
Keywordsgypsum hyroxyapatite β-tricalcium phosphate
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- 3.Barinov, S.M. and Komlev, V.S., Biokeramika na osnove fosfatov kal’tsiya (Bioceramics on the Basis of Calcium Phosphates), Moscow: Nauka, 2005.Google Scholar