HA-Ti生物功能梯度材料微观组织及热应力缓和特性  

Microstructure and Thermal Stress Relaxation Characteristics of Hydroxyapatite-Ti Functionally Graded Biomaterial

作　　者：储成林[1] 尹钟大[1] 朱景川[1] 王世栋[2] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [2]东南大学分析测试中心,南京210018

出　　处：《无机材料学报》1999年第5期775-782,共8页Journal of Inorganic Materials

基　　金：中韩国际合作研究!国家科委1995403号

摘　　要：本文用粉末冶金法制备了ＨＡ－Ｔｉ系生物ＦＧＭ，并测定了ＨＡ－Ｔｉ复合体材料的弹性模量和热膨胀系数．应用经典叠层板理论和热弹性力学理论分析了ＨＡ－Ｔｉ系ＮＦＧＮ双层板和ＨＡ－Ｔｉ系ＦＧＭ的制备残余热应力和热应变．结果表明，ＨＡ－Ｔｉ系生物ＦＧＭ呈现出宏观不均匀性与微观连续性的组织特征．ＨＡ－Ｔｉ系复合体材料的弹性模量在Ｔｉ－ＨＡ８０达到谷值，并受到气孔率的影响．其热膨胀系数随着ＨＡ含量和测试温度的升高而增大．残余热应力和残余热应变强烈依赖于组成分布，ＦＧＭ由于组成梯度化减小了成分变化幅度，其最大残余拉应力只有ＨＡ／Ｔｉ直接叠合体（ＮＦＧＭ）的１／３。The Hydroapatite(HA)-Ti functionally graded biomaterial(FGM) was developed by powdermetallurgical process. Young's modulus and thermal expansion coefficient of HA-Ti compositematerials were investigated. The residual thermal stress and strain in HA-Ti FGM and HA/Tidual laminate (non- FGM) cooled to room temperature after sintering was analyzed by the classicallamination theory and thermal-elastic mechanics. The results show the HA-Ti FGM displays themicrostructural characteristics of macroscopic inhomogeneity and microscopic continuity. Young'smodulus of HA-Ti composite materials is affected by the porosity and reaches its valley point atTi--HA80. The thermal expansion coefficient increases with the rise of the testing temperatureand HA content. The residual thermal stress and strain strongly depends on the constitutionaldistribution. In FGM, the maximal residual tensile stress is only a third of that in non-FGM plate.It is obvious that the HA-Ti FGM has the function of thermal stress relaxation.

关 键 词：功能梯度材料 生物材料 热应力缓和 羟基磷灰石 钛 

分 类 号：TB390.3[一般工业技术—材料科学与工程] R318.08[医药卫生—生物医学工程]