New Zr-25Ti-xMo alloys for dental implant application: Properties characterization and surface analysis

Chengxia Wei; Liying Luo; Zhangxi Wu; Jiakai Zhang; Shi Su; Yongzhong Zhan

doi:10.1016/j.jmbbm.2020.104017

New Zr-25Ti-xMo alloys for dental implant application: Properties characterization and surface analysis

J Mech Behav Biomed Mater. 2020 Nov:111:104017. doi: 10.1016/j.jmbbm.2020.104017. Epub 2020 Aug 10.

Authors

Chengxia Wei¹, Liying Luo², Zhangxi Wu², Jiakai Zhang², Shi Su², Yongzhong Zhan³

Affiliations

¹ School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi, 530004, China; Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning, Guangxi, 530004, China; Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518000, China.
² School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi, 530004, China; Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning, Guangxi, 530004, China.
³ School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi, 530004, China; Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning, Guangxi, 530004, China. Electronic address: zyzmatres@aliyun.com.

PMID: 32818772
DOI: 10.1016/j.jmbbm.2020.104017

Abstract

A series of Zr-25Ti-xMo (x = 0, 2.5, 5, 7.5, 10 and 12.5 wt %) as-cast alloys were designed to advance a new-brand Zr-based alloy with low Young's elastic, moderate compression strength, superior corrosion resistance and good wear behavior for the application of dental implant materials. In the present study, the microstructures of the alloys were evaluated by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. The microhardness and uniaxial compression measurement were performed to evaluate the mechanical properties of the alloys. The electrochemical behaviors of the alloys was investigated in artificial saliva solution. The friction and wear performances of the Zr-25Ti-xMo alloys were examined by pin-on-disk under the load of 15 N. The results shows that the crystalline structure transforms from hexagonal close-pack (α phase, x = 0 wt %) to body-centered cubic structure (β phase, 5 ≤ x ≤ 12.5 wt %) through a α + β dual-phase region (x = 2.5 wt %). They exhibits excellent mechanical properties with low elastic modulus (from 17.7 to 24.4 GPa) and moderate compression strength (from 1154.4 to 1310.8 MPa). The Zr-25Ti-xMo alloys possess good corrosion resistance due to the formation of a protective passive film consisting mainly of ZrO₂, TiO₂ and minor MoO₃. Especially, the polarization curves demonstrates that the Zr-25Ti-7.5Mo alloy has a wider passive region than the other five alloys and it possesses the lower corrosion current density and corrosion rate. Furthermore, this alloy exhibits good abrasion resistance with the lowest coefficients of friction and volume wear loss. Thus, the Zr-25Ti-7.5Mo alloy has a combination of excellent mechanical properties such as low elastic modulus, moderate yield strength and the compression strength, good electrochemical stability and well wear resistance, it is considered a promising candidate for orthopedic materials as dental implant.

Keywords: Corrosion behavior; Friction and wear; Low elastic modulus; Zr–Ti–Mo alloys.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Alloys*
Biocompatible Materials
Corrosion
Dental Implants*
Materials Testing
Surface Properties
Titanium
X-Ray Diffraction

Substances

Alloys
Biocompatible Materials
Dental Implants
Titanium