论文部分内容阅读
用粉末冶金法制备出ＨＡＴｉ／Ｔｉ／ＨＡＴｉ 轴对称生物功能材料（ＦＧＭ） ， 并测定了ＨＡＴｉ 复合体材料的力学性能和热膨胀系数。应用经典叠层板理论和热弹性力学理论分析了ＨＡ４０Ｔｉ／Ｔｉ／ＨＡ４０Ｔｉ 直接叠层体和轴对称ＦＧＭ 制备残余热应力。结果表明其微观组织呈对称型梯度化分布。ＦＧＭ 中间纯Ｔｉ 层具有最高的抗弯强度和断裂韧性（ 分别为９７１ ．９６ ＭＰａ 和２９ ．６９１ ＭＰａ·ｍ １／２） ， 而表面层的弹性模量最低， 只有８７ ．７１ ＧＰａ。从生物医学应用的角度看， 力学性能如此分布的生物材料正是我们所期望的。其热膨胀系数随着ＨＡ 含量和温度的升高而增大。制备残余热应力强烈依赖于组成分布，组成对称梯度化分布导致了ＦＧＭ 中残余热应力也呈现对称梯度化分布， 并降低了其表面层制备残余拉应力。
The HATi / Ti / HATi axisymmetric bio-functional material (FGM) was prepared by powder metallurgy and the mechanical properties and thermal expansion coefficient of the HATi composite were measured. The residual thermal stress of HA40Ti / Ti / HA40Ti direct laminate and axisymmetric FGM were analyzed by using the theory of classical laminate and thermoelasticity. The results show that the microstructure is symmetrical gradient distribution. The pure Ti layer in FGM had the highest flexural strength and fracture toughness (971.96 MPa and 29.669 MPa · m 1/2, respectively), while the lowest elastic modulus of the surface layer was only 87%. 71 GPa. From a biomedical application point of view, biomaterials with such a distribution of mechanical properties are exactly what we expect. Its thermal expansion coefficient increases with the increase of HA content and temperature. The residual thermal stress is strongly dependent on the composition distribution. The symmetrical gradient distribution of composition leads to the symmetrical gradient distribution of the residual thermal stress in the FGM and reduces the residual tensile stress in the surface layer.