Fabrication of Biodegradable Fiber Reinforced Ti Functionally Graded Materials and Their Wear Properties

可生物降解纤维增强钛功能梯度材料的制备及其耐磨性能

• 批准号: 17560604
• 负责人: WATANABE Yoshimi
• 金额: $ 2.24万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560604/
• 关键词: Metallic Implant Material; Biodegradable Fiber; Functionally Graded Material; spark plasma sintering (SPS); Wear; Porous Material; Ti; NaCl; 放電プラズマ焼結; 異方性; 摩耗; 硬さ

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.

钛和钛合金是特别有吸引力的金属植入材料。这是因为这些合金具有较低的剪切模量和与骨的良好生物相容性。然而，骨与钛合金的界面粘附能力较低。作为改善界面结合能力的方法，在钛合金表面涂覆羟基磷灰石等生物亲和材料。然而，这样的生物亲和性材料具有低强度和耐磨性。本研究采用放电等离子烧结（SPS）方法制备了含可生物降解聚L-乳酸（PLLA）纤维的钛基复合材料。PLLA纤维在钛基体中起增强作用，并随着时间的推移在体内逐渐分解。通过PLLA的分解，钛基质中产生孔隙，同时骨渗透到孔隙中。因此，可以预期骨与钛基质之间的紧密结合。采用SPS法制备了Ti-PLLA复合材料，并对其进行了微观结构观察和力学性能测试。结果表明，Ti-PLLA复合材料具有PLLA片状的层状结构。Ti-PLLA复合材料的硬度和磨损行为因其结构而具有各向异性。但由于钛基体的烧结不完全，导致复合材料的强度较低。通过改变SPS的温度可以改善Ti基体的烧结，从而可以制备出力学性能各向异性的Ti-PLLA复合材料。

项目成果

Biodegradable Fiber Reinforced Ti Composite Fabricated by Spark Plasma Sintering Method

• DOI: 10.4028/www.scientific.net/msf.539-543.3201
• 发表时间: 2007-02
• 期刊: Materials Science Forum
• 作者: H. Sato;Seiichiro Umaoka;Yoshimi Watanabe;I. Kim;M. Kawahara;M. Tokita