作　　者： ; ; ; ; ;

机构地区： 中南大学材料科学与工程学院粉末冶金国家重点实验室

出　　处： 《粉末冶金材料科学与工程》 2002年第4期271-276,共6页

摘　　要： 研究了低钙磷比溶液电沉积缺钙羟基磷灰石生物陶瓷涂层在水热合成和700℃、800℃和900℃焙烧后的相组成和显微组织结构。用扫描电镜(SEM)和X射线衍射(XRD)对涂层进行分析,结果表明:在电沉积液Ca/P比为1.30、沉积液温度为25℃、电压为4 V的条件下,Ti基体表面沉积了片状和条状HAP和CaHPO_4·2H_2O混合相涂层。在pH值为12的碱液中经150℃和200℃水热合成4 h后,涂层由针状纯HAP组成,Ca/P比约为1.61,且随着水热合成温度的升高,晶体结晶度提高,但晶体无明显长大趋势。经700℃焙烧后,涂层仍由纯HAP组成,只是晶体因失水而发生团聚;经800℃焙烧后,部分HAP发生分解,生成β-Ca_3(PO_4)_2,且HAP与β-Ca_3(PO_4)_2的体积比为90∶10,形貌为块状和板条状,其表面附着许多细小的针状颗粒;经900℃焙烧后,β-Ca_3(PO_4)_2的含量增加,HAP与β-Ca_3(PO_4)_2的体积比为74∶26,小颗粒团聚成较大的块状和板条状颗粒。由此制备了对骨组织生长更有利的HAP+β-Ca_3(PO_4)_2双相涂层结构。 The microstructure and the phase composition of Hydroxyapatite Bioceramic Coating in low Ca and P mass ratio by Electrodeposition-hydrothermal Synthesis and calcination at 700℃, 800℃ and 900℃ are studied. SEM, XRD and TEM are used to analyze. The results show that: plate-like and strip-like HAP and CaHPO_4·2H_2O mixed coatings are obtained on the surface of Ti in the solution in which the Ca and P mass ratio is 1.30 and at 25℃, 4 V. After hydrothermal treatment in the solution in which the pH value is 12 and at 150℃ and 200℃ for 4h, the coatings are composed of needle-like pure HAP, the Ca and P mass ratio is 1.61. With the increase of temperature, the size of the crystal does not grow obviously. But the degree of crystallization increases. The phase composition of coating does not change after calcination at 700℃, but the particles aggregated because of lose of the water. After calcination at 800℃ and 900℃, a part of HAP change into β-Ca_3 (PO_4)_2, the volume ratio is 90∶10 and 74∶26 individually, crystals lump into plate-like and band-like particles. With increase of temperature, The phenomenon of aggregation become distinct. A coating with A biphasic HAP+β-Ca_3 (PO_4)_2 which is more benefit to bone growth is obtained.

关 键 词： 电沉积 水热合成 羟基磷灰石 生物陶瓷 涂层

领　　域： [化学工程] [化学工程]