凝胶-浇注法制备多孔羟基磷灰石的抗压强度正交试验分析

Orthogonal Test Analysis of Compressive Strength of Porous Hydroxylapatite Prepared by Gel-casting Process

多孔羟基磷灰石 (简称 HA)具有良好的引导骨形成的能力 ,是目前骨缺损修复术中替代自体骨的常用材料之一。利用凝胶 -浇注成型工艺制备多孔 HA,工艺简单 ,并能制备形状复杂的陶瓷坯体。本研究利用正交试验法 ,对抗压强度实验结果进行分析 ,找出有机单体 AM、交联剂 MBAM、引发剂 APS及水等工艺参数的主次关系和较优水平 ,并研究了干燥、烧结工艺等因素对多孔羟基磷灰石特性的影响。结果表明 ,凝胶 -浇注成型工艺过程中各因素的主次关系依次为 :有机单体 AM、引发剂 APS、交联剂 MBAM、水。根据各因子的较优水平 ,选用合适的料浆组成和干燥、烧结工艺 ,制备出了抗压强度为 6～ 7MPa的多孔羟基磷灰石。

Porous hydroxylapatite (HA) has excellent osseous inductive ability. It has been prepared by gel-casting process, which is feasible and can make complex ceramic material. According to the result of orthogonal test based on the compressive strength, the order and the level of the factors, including monomer HA, initiator MBAM, catalyst APS and water, were dealt with. The effects of drying and sintering technique on the properties of porous hydroxylapatite were also researched. The results showed that the order of every factor in the gel-casting process is as follows, AM-APS, MBAM, H 2O. Based on the determined level of each factor, the suitable slurry constituents and drying and sintering technologies were selected, and the porous hydroxylapatite with compressive strength of 6-7 MPa was produced.