Biodegradable Fiber Reinforced Ti Composite Fabricated by Spark Plasma Sintering Method
Biodegradable Fiber Reinforced Ti Composite Fabricated by Spark Plasma Sintering Method
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DOI：
10.4028/www.scientific.net/msf.539-543.3201
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发表时间：
2007-02
期刊：
影响因子：
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通讯作者：
H. Sato;Seiichiro Umaoka;Yoshimi Watanabe;I. Kim;M. Kawahara;M. Tokita
中科院分区：
文献类型：
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作者：
H. Sato;Seiichiro Umaoka;Yoshimi Watanabe;I. Kim;M. Kawahara;M. Tokita
作为金属植入材料，钛和钛合金是特别有吸引力的材料。这是因为这些合金具有较低的剪切模量和与骨良好的生物相容性。但骨与钛合金的界面粘附能力较低。作为提高界面粘附能力的方法，在钛合金表面涂覆羟基磷灰石等生物亲和材料。然而，此类生物亲和材料的强度和耐磨性较低。在这项研究中，采用放电等离子烧结（SPS）方法制备了含有可生物降解聚左旋乳酸（PLLA）纤维的钛复合材料。 PLLA纤维在Ti基体中起到增强体的作用，并且随着时间的推移在体内逐渐分解。通过PLLA的分解，在Ti基质中产生孔隙，并且骨同时渗透到孔隙中。因此，骨和钛基体之间的紧密结合是可以预期的。采用SPS方法制备的Ti-PLLA复合材料，进行了微观结构观察和力学测试。结果发现Ti-PLLA复合材料具有板状PLLA的层状结构。 Ti-PLLA复合材料因其结构而具有各向异性，其硬度和磨损行为具有各向异性。然而，由于Ti基体烧结不完善，Ti-PLLA复合材料的强度较低。由于改变SPS温度可以改善Ti基体的烧结，因此通过SPS方法可以期望获得具有各向异性力学性能的Ti-PLLA复合材料。
Ti and Ti alloys are particularly attractive materials as the metallic implant-material. This is because that these alloys have low shear modulus and the good biological compatibility with bone. However, interfacial adhesion ability of bone and Ti alloy is low. As improvement method of the interfacial adhesion ability, bioaffinity material like hydroxyapatite has been coated on surface of the Ti alloys. However, such bioaffinity materials have low strength and wear resistance. In this study, Ti composites containing biodegradable poly-L-lactic-acid (PLLA) fiber were fabricated by spark plasma sintering (SPS) method. The PLLA fiber plays a role as reinforcement in Ti matrix, and can be gradually decomposed inside body with progress of time. By the decomposition of PLLA, pore is generated in Ti matrix, and bone simultaneously penetrates into the pore. Therefore, tightly bond between bone and Ti matrix can be expected. Using the Ti-PLLA composites fabricated by SPS method, microstructural observation and mechanical tests were performed. It was found that Ti-PLLA composite has laminate-layer structure with plate-like shape PLLA. Hardness and wear behavior of Ti-PLLA composite has anisotropy due to its structure. However, strength of the Ti-PLLA composite is low because of the imperfect sintering of Ti matrix. Since sintering of Ti matrix can be improved by changing the temperature of SPS, Ti-PLLA composite with anisotropic mechanical properties can be expected by SPS method.