【摘 要】
：
Nanophase calcium-deficient hydroxyapatite( CDHA ) with a Ca/P ratio about 1.5 synthesized by chemical wet method was sintered at different temperatures, and th
【机 构】
：
School of Stomatology,School of Material Science and Engineering
论文部分内容阅读
Nanophase calcium-deficient hydroxyapatite( CDHA ) with a Ca/P ratio about 1.5 synthesized by chemical wet method was sintered at different temperatures, and then its chemical composition, phase structure and morphology were analyzed with methods of FT- IR spectroscopy, X- ray diffraction (XRD) and field emission scanning microscopy (FESEM), respectively. Results shaw that when the sintering temperature is below 500 ℃ ,apatite crystal keeps a stable size with a diameter of 12-26 nm and a length of 30-66 nm. After being sintered at600 ℃ for 2 h, apatite crystal grows much larger with a diameter of 25-40 nm and a length of 75-100 nm. At the temperature of 700-800 ℃, this powder decomposes into Ca3 ( PO4 )2 - The crystal size of the Ca3 ( PO4 )2surpasses 200 nm in diameter and length. NH4+ ion can be removed at terrperature beyond 300 ℃ .
其他文献
Owing to the complexity of the pipe-in-pipe (PIP) riser system in structure, load and restraint, many problems arise in the structural analysis of the system. T
By using CALPHAD (Calculation of Phase Diagram) technique the optimization and calculation of the binary systems of TbCl3-ACl (A= Li, Na, K, Rb, Cs) were carrie
The dual-bath coagulation method was used for the preparation of PES membrane in this experiment . The main intent of this study was to assess the efforts of ge
The influence of different surface coatings of NiTi shape memory alloys was examined using in vitro testing methods. Plates of superelastic nickel-titanium shap
The emergence of third generation mobile system (3G) makes video transmission in wireless environment possible,and the latest 3GPP/3GPP2 standards require 3G te
Current calcium phosphate (CaP) biomaterials for bone repair, substitution, augmentation and regeneration include hydroxyapatite ( HA ) from synthetic or biolog
A new method ( sintering method) to prepare hydroxylapatite coating of implants was developed. The coating was characterized by X- ray diffraction (XRD) and inf
The montmorillonite was studied by different methods, such as chemical analysis, DAT, TG, XRD, IR, AFM and MAS NMR. The experimental results show that the hydro
We solve the problem of petroleum products distribution through oil pipelines networks. This problem is modelled and solved using two techniques: A heuristic me
From the measured phase equilibria data and experimental thermochemical properties, the TmCl3-ACl (A=Na, K, Rb, Cs) phase diagrams were optimized and calculated