首页|Phase Evolution and Microstructure Characteristics of Calcium Phosphate Based Glass Ceramics Prepared by Sol-gel Technique
Phase Evolution and Microstructure Characteristics of Calcium Phosphate Based Glass Ceramics Prepared by Sol-gel Technique
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NETL
NSTL
Trans Tech Publications Ltd
Calcium phosphate based glasses and glass-ceramics in the system of 54CaO-36P_2O_5-(10-x)Na_2O-xSrO were fabricated by sol-gel method. The structures of the glasses were investigated by Fourier transform infrared spectroscopy and X-ray diffraction has been used to determine the crystallize phase from glass matrix. The synthesized glass matrix shows a metaphosphate-like structure which consists of a chain and /or ring structure. After sintered at 1150℃, the crystalline phase β-Ca_2P_2O_7 and a small quantity of amorphous glass were observed clearly. With 1.0 mol% addition of SrO, the average grain size of β-Ca_2P_2O_7 was obviously decreased and some of them were covered with amorphous glass. When the content of strontium reached to 5.0 mol%, only a little crystalline phase β-Ca_2P_2O_7 can be found in the glass matrix, while the grain size has no significant change, compared with that of the sample containing 1.0 mol% SrO. The results showed that SrO addition to 54CaO-36P_2O_5-10Na_2O system can inhibit the crystallization of β-Ca_2P_2O_7 and decrease the grain size, and then adjust the degradation rate in body fluid by controlling the ratio of β-Ca_2P_2O_7 to amorphous glass.
sol-gel techniqueglass-ceramicsphase evolution
Xudong Li、Shu Cai、Wenjuan Zhang、Zhe Zhang
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School of Material Science and Engineering, Tianjin University, Tianjin 300072, China
NETL
NSTL
Trans Tech Publications Ltd
