ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Ti and Ti alloys are particularly attractive materials as the metallic implant-material. Thisis 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 theinterfacial adhesion ability, bioaffinity material like hydroxyapatite has been coated on surface of theTi alloys. However, such bioaffinity materials have low strength and wear resistance. In this study, Ticomposites containing biodegradable poly-L-lactic-acid (PLLA) fiber were fabricated by sparkplasma sintering (SPS) method. The PLLA fiber plays a role as reinforcement in Ti matrix, and canbe gradually decomposed inside body with progress of time. By the decomposition of PLLA, pore isgenerated in Ti matrix, and bone simultaneously penetrates into the pore. Therefore, tightly bondbetween bone and Ti matrix can be expected. Using the Ti-PLLA composites fabricated by SPSmethod, microstructural observation and mechanical tests were performed. It was found thatTi-PLLA composite has laminate-layer structure with plate-like shape PLLA. Hardness and wearbehavior of Ti-PLLA composite has anisotropy due to its structure. However, strength of theTi-PLLA composite is low because of the imperfect sintering of Ti matrix. Since sintering of Timatrix can be improved by changing the temperature of SPS, Ti-PLLA composite with anisotropicmechanical properties can be expected by SPS method
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3201.pdf
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