Novel CrAlYN/CrN nanoscale multilayer PVD coatings produced by the combined High Power Impulse Magnetron Sputtering/Unbalanced Magnetron Sputtering technique for environmental protection of γ-TiAl alloys

被引：26
|
作者：
Hovsepian, P. Eh. [1 ]
Ehiasarian, A. P. [1 ]
Braun, R. [2 ]
Walker, J. [3 ]
Du, H. [4 ]
机构：
[1] Sheffield Hallam Univ, Nanotechnol Ctr PVD Res, Sheffield S1 1WB, S Yorkshire, England
[2] DLR German Aerosp Ctr, Inst Mat Res, Cologne, Germany
[3] Univ Sheffield, Sheffield S10 2TN, S Yorkshire, England
[4] Northumbria Univ, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England
来源：
SURFACE & COATINGS TECHNOLOGY | 2010年 / 204卷 / 16-17期
关键词：
High Power Impulse Magnetron Sputtering; Gamma titanium aluminides; Oxidation; Wear; High temperature corrosion; HARD COATINGS;
D O I：
10.1016/j.surfcoat.2010.02.021
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
CrAlYN/CrN coatings utilising nanoscale multilayer structure with a typical bi-layer thickness of 4.2 nm have been deposited on light-weight Ti-45Al-8Nb alloys known as gamma-TiAl. The surface pre-treatment was carried out by bombardment with Cr1+ ions generated by High Power Impulse Magnetron Sputtering, (HIPIMS) discharge, whereas the nanoscale multilayer CrAlYN/CrN coating was deposited by Unbalanced Magnetron Sputtering (UBM). Scanning Transmission Electron Microscopy (STEM), revealed that the coating/substrate interface was extremely clean and sharp. Large areas of coating growing epitaxially were observed. STEM-Energy Dispersive Spectroscopy (EDS) profile analyses further showed that, during the HIPIMS ion bombardment, Cr was implanted into the substrate to a depth of 5 nm. Adhesion critical load values as high as L-C = 37 N have been measured in scratch adhesion tests. Impact tests brought further evidence for strong bonding. For coated gamma-TiAl alloys, thermogravimetric quasi-isothermal oxidation tests in air at 750 degrees C after 1000 h exposure showed four times smaller weight gain compared to the uncoated material. In sulphidation tests after 1000 h exposure to aggressive H-2/H2S/H2O atmosphere the CrAlYN/CrN protected gamma-TiAl alloys showed a weight gain reduced by factor of four as compared to the uncoated substrate. High temperature pin-on-disc tests revealed that the friction coefficient reduces from 0.56 at room temperature to 0.4 at 630 degrees C. (C) 2010 Elsevier B.V All rights reserved.
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收藏
页码：2702 / 2708
页数：7
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