Improvement of antibacterial activity and mechanical properties of titanium alloy by TiAlN/Ag gradient multilayer coatings

Author:

Fang Xianglin12,Tu Rong123ORCID,Liu Jiawei2,Dai Honglian2,Zheng Long3,Zhu Shaobo4,Zhang Song12,Goto Takashi5ORCID

Affiliation:

1. Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory 1 , Chaozhou 521000, China

2. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology 2 , Wuhan 430070, China

3. Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City 3 , Zhongshan 528400, China

4. Zhongnan Hospital of Wuhan University 4 , Wuhan 430071, China

5. New Industry Creation Hatchery Center, Tohoku University 5 , Sendai 980-8579, Japan

Abstract

Silver coating has an excellent antibacterial activity but low mechanical properties, e.g., microhardness. In order to improve simultaneously the antibacterial activity and surface hardness of titanium alloys, TiAlN/Ag multiple coatings with different gradient distributions in thickness were prepared on titanium alloys by unbalanced magnetron sputtering. The coatings with gradient thickened TiAlN–Ag cosputtered upper layers had a much stronger antibacterial activity, 99.82% in antiseptic Escherichia coli, than those with the gradient thinned upper layers. With increasing gradient cycles of the multiple coatings, the antibacterial activity decreased, whereas the hardness increased. The alternate growth of TiAlN and TiAlN–Ag layers may repeatedly provide an excellent comprehensive antibacterial activity (99.23% for Escherichia coli) and hardness (two times TC4 alloy) for a long term.

Funder

Major Projects of Guangdong Education Department for Foundation Research and Applied Research

National Major Science and Technology Projects of China

National Natural Science Foundation of China-Guangdong Joint Fund

Overseas Expertise Introduction Project for Discipline Innovation

International Science and Technology Cooperation Programme

Hubei Technological Innovation Special Fund

Publisher

American Vacuum Society

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Condensed Matter Physics

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