Surface modification of titanium alloy orthopaedic implants via novel powder immersion reaction assisted coating nitriding method

被引：2

作者：

Shenhar, A. ^{[1
]}

Gotman, I. ^{[1
]}

Gutmanas, E.Y. ^{[1
]}

Ducheyne, P. ^{[1
]}

机构：

[1] Technion, Haifa, Israel

来源：

Materials Science and Engineering A | 1999年 / 268卷 / 01期

关键词：

Annealing - Implants (surgical) - Microhardness - Nitriding - Powder metallurgy - Scanning electron microscopy - Surface structure - Surface treatment - X ray diffraction analysis;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

There is increasing interest in using surface modification technology to improve the wear properties of titanium alloys used in total joint replacements. In the present work, a simple and original Power Immersed Reaction Assisted Coating (PIRAC) nitriding method suitable for surface modification of large complex shape orthopaedic implants has been developed. CP Ti and Ti-6Al-4V alloy samples were annealed at 850-1100°C in sealed stainless steel containers that allow selective diffusion of nitrogen atoms from the atmosphere. The relationship between the microstructure, nitrogen concentration and microhardness was studied employing X-ray diffraction (XRD), scanning electron microscopy (SEM)/electron probe X-ray microanalysis (EPMA) and high resolution SEM (HRSEM). PIRAC nitrided surfaces were found to have a layered structure with a TiN/Ti2N coating followed by nitrogen-stabilized α-Ti. In contrast to previous investigations of surface nitrided Ti-6Al-4V alloy, a Ti3Al intermetallic phase was detected at the Ti2N/α-Ti interface acting as a barrier for nitrogen diffusion. Importantly for biomedical applications, no toxic Al or V were detected in the surface layer of PIRAC nitrided Ti-6Al-4V alloy.

引用

页码：40 / 46