skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Fabrication of oxide dispersion strengthened bond coats with low Al2O3 content [Fabrication of ODS bond coats with low Al2O3 content]

Journal Article · · Journal of Thermal Spray Technology
 [1];  [2];  [2];  [1]
  1. Forschungszentrum Julich GmbH, Julich (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, nanoscale oxide dispersions have long been used to increase the oxidation and wear resistance of alloys used as bond coatings in thermal barrier coatings. Their manufacturing via mechanical alloying is often accompanied by difficulties regarding their particle size, homogeneous distribution of the oxide dispersions inside the powder, involving considerable costs, due to cold welding of the powder during milling. A significant improvement in this process can be achieved by the use of process control agent (PCA) to achieve the critical balance between cold welding and fracturing, thereby enhancing the process efficiency. In this investigation, the influence of the organic additive stearic acid on the manufacturing process of Al2O3-doped CoNiCrAlY powder was investigated. Powders were fabricated via mechanical alloying at different milling times and PCA concentrations. The results showed a decrease in particle size, without hindering the homogeneous incorporation of the oxide dispersions. Two powders manufactured with 0.5 and 1.0 wt.% PCA were deposited by high velocity oxygen fuel (HVOF) spraying. Results showed that a higher content of elongated particles in the powder with the higher PCA content led to increased surface roughness, porosity and decreased coating thickness, with areas without embedded oxide particles.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Nuclear Science User Facility (NSUF)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1366405
Journal Information:
Journal of Thermal Spray Technology, Vol. 26, Issue 5; ISSN 1059-9630
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

References (35)

Influence of cryomilling on the microstructural features in HVOF-sprayed NiCrAlY bond coats for thermal barrier coatings: Creation of a homogeneous distribution of nanoscale dispersoids journal July 2010
Oxidation behavior of HVOF sprayed nanocrystalline NiCrAlY powder journal December 2002
The addition of a surfactant at regular time intervals in the mechanical alloying process journal December 2014
Studies of the bond-coat oxidation and phase structure of TBCs journal March 1999
Oxidation behavior of mechanically alloyed chromium based alloys journal May 1997
The effects of process control agents on mechanical alloying mechanisms in the TiAl system journal July 1996
Surfactants in Mechanical Alloying/Milling: A Catch-22 Situation journal December 2013
Current status of thermal barrier coatings — An overview journal January 1987
Differences in growth mechanisms of oxide scales formed on ODS and conventional wrought alloys journal August 1989
Literature journal January 2004
Thermal barrier coatings with a double-layer bond coat on Ni3Al based single-crystal superalloy journal April 2014
The Characteristics of Alumina Scales Formed on HVOF-Sprayed MCrAlY Coatings journal January 2000
Effect of process control agent on the porous structure and mechanical properties of a biomedical Ti–Sn–Nb alloy produced by powder metallurgy journal April 2010
The use of two reactive elements to optimize oxidation performance of alumina-forming alloys journal January 2003
Composition and growth mechanisms of alumina scales on FeCrAl-based alloys determined by SNMS journal December 1991
Y-rich oxide distribution in plasma sprayed MCrAlY-coatings studied by SEM with a cathodoluminescence detector and Raman spectroscopy journal November 2009
Advances in Coating Design for High-Performance Gas Turbines journal September 2003
Dispersion strengthened aluminum made by mechanical alloying journal August 1977
Oxidation behaviour of CoNiCrAlY bond coats produced by plasma, HVOF and cold gas dynamic spraying journal September 2010
Synthesis and Oxidation Behavior of Nanocrystalline MCrAlY Bond Coatings journal March 2005
Mechanical Properties and Microstructure of VPS and HVOF CoNiCrAlY Coatings journal July 2011
Abrasive Wear Resistance of Plasma-Sprayed Glass-Composite Coatings journal December 2001
The effect of various oxide dispersions on the phase composition and morphology of Al2O3 scales grown on β-NiAl journal February 1997
Effects of milling time on powder packing characteristics and compressive mechanical properties of sintered Ti-10Nb-3Mo alloy journal February 2015
Parameters affecting TGO growth and adherence on MCrAlY-bond coats for TBC's journal December 2006
Thermal barrier coatings for aircraft engines: history and directions journal March 1997
Current Thoughts on Reactive Element Effects in Alumina-Forming Systems: In Memory of John Stringer journal May 2016
Nanocrystalline NiCrAlY powder synthesis by mechanical cryomilling journal October 2004
Effect of Particle Morphology and Size Distribution on Cold-Sprayed Pure Titanium Coatings journal June 2013
Role of process control agent on synthesis and consolidation behavior of nano-crystalline copper produced by mechano-chemical route journal October 2008
The effect of grinding aids on the fine grinding of limestone, quartz and Portland cement clinker journal September 1991
Thermal Barrier Coatings for Gas-Turbine Engine Applications journal April 2002
Bond coat oxidation and its significance for life expectancy of thermal barrier coating systems journal March 2004
Oxidation and Corrosion of New MCrAlX Coatings: Modelling and Experiments journal January 2014
Handbuch Hochtemperatur- Werkstofftechnik book January 2011

Cited By (1)