关键词: 磷灰石, 硅灰石, 生物活性

Abstract: Apatite-wollastonite (AW) bioactive glass powder was prepared by sol-gel process.Effects of feeding way,reaction temperature,and pH on the property of gel were researched.Phase composition and microstructure of the materials were analyzed by X-ray diffraction,Fourier transform-infrared reflection spectroscopy,and electron scanning microscopy.Results showed that the property of gel was the best under the following conditions:the feeding way was adding triethylphosphate after the hydrolysis of tetraethoxysilane ethanol solution for 30 min with HNO₃ as catalyst,and then introducing Ca and Mg in the form of nitrate,introducing F in the form of NH₄HF₂;the reaction temperature was 25 ℃;and pH was at 1～2.Main crystalline phases of the sintered glass powder were apatite and wollastonite.Particles whose sizes and shapes were uniform did not make any apparent agglomeration.Porosity was at 35%~40%.

Key words: apatite, wollastonite, bioactivity