J. Mater. Sci. Technol. ›› 2023, Vol. 157: 21-29.DOI: 10.1016/j.jmst.2023.02.015

• Research Article • Previous Articles     Next Articles

Porous bio-high entropy alloy scaffolds fabricated by direct ink writing

Guangbin Zhaoa,1, Xiaoxi Shaob,1, Qingxian Zhanga, Yanlong Wuc,d, Yaning Wanga, Xu Chena,d, Hang Tiane, Yaxiong Liud,*, Yanpu Liub,*, Bingheng Lua   

  1. aState Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710054, China;
    bState Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Clinical Research Center for Oral Diseases, Department of Oral and Maxillofacial Surgery, School of Stomatology, The Fourth Military Medical University, Xi’an 710032, China;
    cSchool of Mechatronic Engineering and Automation, Foshan University, Foshan 528000, China;
    dJi Hua Laboratory, Foshan 528200, China;
    eCollege of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
  • Received:2022-12-13 Revised:2022-12-13 Accepted:2022-12-13 Published:2023-09-10 Online:2023-09-07
  • Contact: *E-mail addresses:. yaxiongliu@163.com (Y. Liu), liuyanpu@fmmu.edu.cn (Y. Liu)
  • About author:1 These authors contributed equally to this work.

Abstract: Porous tantalum-titanium-niobium-zirconium (Ta-Ti-Nb-Zr) bio-high entropy alloy (bioHEA) scaffolds are fabricated using direct ink writing 3D printing technology in this study. A composite ink is prepared using four metal powders as raw materials: Ta, Ti, Nb and Zr. Ink extrusion is used to build 3D scaffolds with interconnected porous structures at room temperature, which are then sintered in a vacuum environment. The interdiffusion of metal elements yields porous bioHEA scaffolds with a body-centered cubic (BCC) structure. The fabricated scaffolds have uniform compositions with a significant alloying effect and good biocompatibility. The scaffolds have a compressive strength of 70.08-149.95 MPa and an elastic modulus of 0.18-0.64 GPa, indicating that the mechanical properties can be controlled over a wide range. The scaffolds have a compressive strength close to that of human cortical bone and thus meet the requirements for porous structure characteristics and biological and mechanical properties of orthopedic implants.

Key words: Direct ink writing, Bio-high entropy alloy, Porous scaffolds, Sintering, Biocompatibility, Orthopedic applications