Zirconia-toughened alumina coated Ti6Al4V via additive manufacturing

被引：8

作者：

Avila, Jose D. ^{[1
]}

Bandyopadhyay, Amit ^{[1
]}

机构：

[1] Washington State Univ, Sch Mech & Mat Engn, WM Keck Biomed Mat Res Lab, Pullman, WA 99164 USA

来源：

MATERIALS LETTERS | 2021年 / 291卷

基金：

美国国家科学基金会; 美国国家卫生研究院;

关键词：

Ti6Al4V; Zirconia-toughened alumina; Load-bearing implants; Surface modification; Directed-energy deposition;

D O I：

10.1016/j.matlet.2021.129577

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

CoCr alloy-based femoral heads have failed prematurely due to galvanic-induced corrosion when coupled with a titanium hip stem. Coupling a titanium based-femoral head with the titanium hip stem is ideal in addressing this failure mode. Ti6Al4V (Ti64) alloy was reinforced with zirconia-toughened alumina (ZTA) by directed-energy deposition (DED)-based additive manufacturing (AM) to address that concern. Preliminary materials processing work resulted in failed samples due to cracking, porosity, and delamination. After careful parameter optimization, a Ti64 + 5wt.%ZTA (5ZTA) composition produced a metallurgically sound and coherent interface, minimal porosity, and bulk structures. Hardness was observed to increase by 27%, normalized wear rate reduced by 25%, and contact resistance increased during in vitro tribological testing along with faster surface re-passivation. (c) 2021 Elsevier B.V. All rights reserved.

引用

页数：5

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