J. Mater. Sci. Technol. ›› 2022, Vol. 100: 137-149.DOI: 10.1016/j.jmst.2021.06.008

• Research Article • Previous Articles     Next Articles

Enhanced bioactivity and interfacial bonding strength of Ti3Zr2Sn3Mo25Nb alloy through graded porosity and surface bioactivation

Sen Yua,b,*(), Zhe Yuc, Dagang Guoa,*(), Hui Zhua, Minghua Zhangc, Jianye Hanb, Zhentao Yub, Yemin Caod, Gui Wange   

  1. aState Key Laboratory for Mechanical Behavior of Materials, School of Material Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    bShaanxi Key Laboratory of biomedical metallic materials, Northwest Institute for Non-ferrous Metal Research, Xi’an 710016, China
    cOrthopedics Oncology Institute of Chinese PLA, Tangdu Hospital, Air Force Medical University, Xi’an 710038, China
    dShanghai Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
    eCentre for Advanced Materials Processing and Manufacturing (AMPAM), The University of Queensland, St Lucia, QLD 4072, Australia
  • Received:2021-02-26 Revised:2021-05-20 Accepted:2021-06-04 Published:2022-02-20 Online:2022-02-15
  • Contact: Sen Yu,Dagang Guo
  • About author:guodagang@mail.xjtu.edu.cn (D. Guo).
    *E-mail addresses: ninbrc@stu.xjtu.edu.cn (S. Yu),
    First author contact:

    1 Sen Yu and Zhe Yu contributed equally to this work.

Abstract:

The gradient porous Ti3Zr2Sn3Mo25Nb (TLM) alloy rods were fabricated through sintering the alloyed powder to a solid core. The porous sample was then modified by a Micro Arc Oxidation (MAO) treatment in an electrolyte containing calcium and phosphate, a hydrothermal treatment enabled secondary microporous hydroxyapatite (HA) coating, and a further bone morphogenetic protein-2 (BMP-2) loading treatment through immersion and freeze-drying. The treatment led to an orderly secondary microporous coating containing HA nano-particles and evenly distributed BMP-2 in the porous coatings. As a result, osteoblasts could adhere and grow well on the coatings with a high cell adhesion rate and cell functional activity. The in-situ shear testing indicated that the interfacial strength had been enhanced significantly. Improvement of the bond formation and osseointegration with the titanium implant is attributed to increased surface area for the cell to attach, creating voids for the cell to grow in, and activating titanium surface by introducing bioactive ingredients such as HA and BMP-2.

Key words: Graded porosity titanium, Secondary microporous, Bioactivity, Ti3Zr2Sn3Mo25Nb alloy, Interface binding strength