Development of NiCrAlY alloys for corrosion-resistant coatings and thermal barrier coatings of gas turbine components
Journal Article
·
· Journal of Pressure Vessel Technology
The demand for improved efficiency and power output of energy conversion systems has lead to an increase of gas inlet temperatures in modern land-based gas turbines. The resulting increase of component surface temperature leads to an enhanced oxidation attack of the blade coating, which, in stationary gas turbines, is usually of the MCrAlY (with M = Co and/or Ni) type. Considerable efforts have been made in the improvement of the high temperature properties of MCrAlY coatings by additions of minor alloying elements. In the present paper, the effect of systematic composition variations, especially yttrium, silicon, and titanium additions, on the protective properties of MCrAlY coatings are presented. The coatings were applied to a steel substrate by low-pressure plasma spraying. Then, free-standing MCrAlY-bodies were machines from the coating. Isothermal and cyclic oxidation tests were carried out in the temperature range 950 C--1,100 C. The effect of systematic variation of titanium and silicon contents on oxidation and microstructural stability was studied by characterization of the coating and the corrosion products using light and electron optical microscopy and by secondary neutrals mass spectrometry (SNMS).
- Research Organization:
- Inst. for Materials in Energy Systems, Juelich (DE)
- OSTI ID:
- 20003794
- Journal Information:
- Journal of Pressure Vessel Technology, Journal Name: Journal of Pressure Vessel Technology Journal Issue: 4 Vol. 121; ISSN 0094-9930; ISSN JPVTAS
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermal barrier coatings on turbine blades by plasma spraying with improved cooling
Examination of in-service coating degradation in gas turbine blades using a small punch testing method
Interaction of a near-{alpha} type titanium alloy with NiCrAlY protective coating at high temperatures
Journal Article
·
Fri Dec 31 23:00:00 EST 1993
· Journal of Engineering for Gas Turbines and Power; (United States)
·
OSTI ID:7115405
Examination of in-service coating degradation in gas turbine blades using a small punch testing method
Book
·
Mon Dec 30 23:00:00 EST 1996
·
OSTI ID:490755
Interaction of a near-{alpha} type titanium alloy with NiCrAlY protective coating at high temperatures
Journal Article
·
Tue Oct 13 00:00:00 EDT 1998
· Scripta Materialia
·
OSTI ID:20023128