Surface modification of Ti-6Al-4V alloys manufactured by selective laser melting: Microstructural and tribo-mechanical characterization

SURFACE & COATINGS TECHNOLOGY

卷:348

Article

Torres, Yadir¹  Sarria, Perla²  Jose Gotor, Francisco³  Gutierrez, Eliel²  Peon, Eduardo⁴  Maria Beltran, Ana¹  Gonzalez, Jesus E.^2,4 

[1] Univ Seville, Ingn & Ciencia Mat & Transporte, Escuela Politecn Super Sevilla, Calle Virgen de Africa 7, Seville 41011, Spain

[2] Technol Univ Havana Jose Antonio Echeverria, Dept Mech Engn Technol, Grp Biomech, Direcc Calle 114,11901 E Ciclovia & Rotonda, Havana, Cuba

[3] Univ Seville, CSIC, Inst Ciencia Mat Sevilla, Avda Americo Vespucio 49, Seville 41092, Spain

[4] Univ Havana, Biomat Ctr, Dept Ceram & Metall Biomat, Ave Univ S-N Entre G & Ronda,Apartado Postal 6323, Havana, Cuba

关键词: Selective laser melting;    Surface modification;    Titanium alloys;    Tribo-mechanical behavior;    Biomaterials;   

DOI  :  10.1016/j.surfcoat.2018.05.015

来源: Elsevier

【 摘 要 】

Medical grade of both titanium (Ti) and Ti6A14V alloy are recognized as the metallic biomaterials with the better outcomes for clinical repair of bone tissue thanks to their suitable mechanical properties and corrosion resistance. However, those Ti advantages are not enough to avoid failure risks of bone implants; between 5 and 10% of Ti implants fail due to a deficient osseointegration, within 5 years of post-implantation. Most of these failures indicate the necessity of getting a better biomechanical-biofunctional balance. Microstructural and tribo-mechanical characterizations were performed on Ti6A14V samples obtained by selective laser melting and subjected to different surface treatments (thermal stress relief, acid etching, chemical treatment and thermochemical treatment). Scanning electron microscopy and X-ray diffraction were used for detailed characterization of the elemental composition, phase analysis and surface morphology. Micro-hardness and scratch tests were employed to evaluate the tribo-mechanical properties, which were improved after consecutive surface treatments. Protuberances with spherical morphology, as a remainder of the original powder, were present on the surface. The resulting modified surfaces were constituted by rutile (major phase) and anatase (minor phase). Submicro-nano-topographies were obtained after the chemical and thermochemical treatments.

【 授权许可】

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