多孔含镁羟基磷灰石的烧结行为及其组织结构

Sintering behavior and organizational structure of porous magnesium-hydroxyapatite

目的用镁作为造孔剂,制备出多孔材料,研究羟基磷灰石烧结行为以及镁在羟基磷灰石中的存在形式,探索研究烧结温度及造孔剂（镁）含量对组织结构的影响。方法采用化学沉淀法,用Ca（H2PO4）·H2O和Ca（OH）2为原料制备纳米HA粉体,将n-HA粉体和Mg粉按一定比例混合后,在200 MPa的压力下压制成型,经高温烧结（1100~1300℃）制备多孔含Mg羟基磷灰石（Mg-HA）,利用X射线衍射（XRD）、扫描电镜（SEM）等手段研究Mg-HA中Mg元素主要的存在形式、各物相的相对含量及含镁羟基磷灰石的断口形貌。结果在Mg-HA中Mg元素主要存在于物相Mg O和Ca3-x MgxPO4中;Mg-HA中的HA相对量随着烧结温度的提高及镁含量的增加而减少。结论 Mg-HA中Mg元素主要以物相Mg O的形式存在外,还以Ca3-xMgxPO4的形式存在;镁含量和烧结温度对Mg-HA中HA的分解起促进作用。

Objective Magnesium powder was used as pore former, and sintering behavior of hydroxyapa- tite （HA） and the forms of magnesium in the porous hydroxyapatite with magnesium （Mg-HA） were stud-ied, and the effect of sintering temperature and pore former （magnesium） content on the organizational structure were explored as well. Methods The nano-HA powders were prepared by chemical precipitation with Ca（ H2PO4 ）2 · H20 and Ca （OH）2 as raw materials in this study. The Mg powders were taken as the pore former and the nano-HA powders were mixed into the Mg powder according to a certain ratio, then the powder mixes were repressed in the repression molding. Porous HA with magnesium which was provided with submieron containing Mg was prepared by high-temperature sintering（ 1100 - 1300℃ ）. The existence forms of Mg in Mg-HA were studied by X-ray diffraction （XRD） and scanning electron microscopy （SEM） , and the content of each phase was calculated. Results the existence form of Mg in Mg-HA was mainly MgO and Ca3_xMgxPO4. The relative content increase of Mg content and sintering temperature of HA in Mg-HA should be gradually reduced with the Conclusions The experimental results show that the magnesium exists mainly in MgO, and Ca3.xMgxPO4in the Mg-HA as well. The decomposition of hydroxyap- atite in the Mg-HA is promoted by the magnesium content and sintering temperature