Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings

被引：14

作者：

Braun, Reinhold ^{[1
]}

Schulz, Uwe ^{[1
]}

Leyens, Christoph ^{[1
,2
]}

Hovsepian, Papken E. ^{[3
]}

Ehiasarian, Arutiun P. ^{[3
]}

机构：

[1] DLR German Aerosp Ctr, Inst Mat Res, D-51170 Cologne, Germany

[2] Tech Univ Dresden, Inst Mat Sci, Dresden, Germany

[3] Sheffield Hallam Univ, Nanotechnol Ctr PVD Res, Sheffield S1 1WB, S Yorkshire, England

来源：

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2010年 / 101卷 / 05期

关键词：

Titanium aluminides; Nitride coatings; Thermal barrier coatings; Oxidation resistance; Fatigue strength; TRIBOLOGICAL PROPERTIES; MECHANICAL-PROPERTIES; TITANIUM ALUMINIDES; THIN-FILMS; RESISTANCE; ALLOYS; CRALN; CR; CR-1-XALXN; PROTECTION;

D O I：

10.3139/146.110323

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

CrAlYN/CrN nanoscale multilayer coatings were deposited on gamma-TiAl substrate material using high power impulse magnetron sputtering technology. The nitride coating provided effective oxidation protection to gamma-TiAl at 850 degrees C for exposure time periods exceeding 2 000 cycles of 1 h dwell time at high temperature in air. High oxidation resistance was also observed at 900 degrees C. After exposure to air at 850 degrees C for 300 h, coated tension specimens exhibited a reduction in fatigue strength of about 70 MPa compared to the bare gamma-TiAl alloy. Zirconia topcoats produced by electron-beam physical vapour deposition were well adherent to the CrAlYN/CrN coating with an oxy-nitride overcoat. When thermally cycled at 900 degrees C, the lifetime of this thermal barrier coating system on gamma-TiAl exceeded 1 000 1 h cycles. Below cracks in the nitride coating, the substrate was oxidised and protrusions of an outer oxide scale with columnar structure formed.

引用

页码：648 / 656

页数：9

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