Author: Robert A. MillerPublisher:
ISBN:
Category : Plasma spraying
Languages : en
Pages : 40
Book Description
Characterization and Durability Testing of Plasma-sprayed Zirconia-yttria and Hafnia-yttria Thermal Barrier Coatings. Part 1: Effect of Spray Parameters on the Performance of Several Lots of Partially Stabilized Zirconia-yttria Powder
Author: Robert A. MillerPublisher:
ISBN:
Category : Plasma spraying
Languages : en
Pages : 40
Book Description
NASA Technical Memorandum
Author: Bibliography of Lewis Research Center Technical Publications Announced in 1993
Author: Scientific and Technical Aerospace Reports
Author: Monthly Catalogue, United States Public Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1060
Book Description
Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1060
Book Description
Government Reports Annual Index
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1452
Book Description
Government Reports Announcements & Index
Author: Characterization and Durability Testing of Plasma-Sprayed Zirconia-Yttria and Hafnia-Yttria Thermal Barrier Coatings. Part 2
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781725547247
Category :
Languages : en
Pages : 36
Book Description
This is the second of two reports which discuss initial experiments on thermal barrier coatings prepared and tested in newly upgraded plasma spray and burner rig test facilities at LeRC. The first report, part 1, describes experiments designed to establish the spray parameters for the baseline zirconia-yttria coating. Coating quality was judged primarily by the response to burner rig exposure, together with a variety of other characterization approaches including thermal diffusivity measurements. That portion of the study showed that the performance of the baseline NASA coating was not strongly sensitive to processing parameters. In this second part of the study, new hafnia-yttria coatings were evaluated with respect to both baseline and alternate zirconia-yttria coatings. The hafnia-yttria and the alternate zirconia-yttria coatings were very sensitive to plasma-spray parameters in that high-quality coatings were obtained only when specific parameters were used. The reasons for this important observation are not understood. Miller, Robert A. and Leissler, George W. Glenn Research Center NASA-TP-3296, E-7152, NAS 1.60:3296 NAS3-25266; RTOP 505-63-5A...
Environmental Barrier Coatings
Author: Kang N. Lee Publisher: MDPI
ISBN: 3039365177
Category : Science
Languages : en
Pages : 168
Book Description
The global increase in air travel will require commercial vehicles to be more efficient than ever before. Advanced engine hot section materials are a key technology required to keep fuel consumption and emission to a minimum in next-generation gas turbines. Ceramic matrix composites (CMCs) are the most promising material to revolutionize gas turbine hot section materials technology because of their excellent high‐temperature properties. Rapid surface recession due to volatilization by water vapor is the Achilles heel of CMCs. Environmental barrier coatings (EBCs) is an enabling technology for CMCs, since it protects CMCs from water vapor. The first CMC component entered into service in 2016 in a commercial engine, and more CMC components are scheduled to follow within the next few years. One of the most difficult challenges to CMC components is EBC durability, because failure of EBC leads to a rapid reduction in CMC component life. Key contributors to EBC failure include recession, oxidation, degradation by calcium‐aluminum‐magnesium silicates (CMAS) deposits, thermal and thermo‐mechanical strains, particle erosion, and foreign object damage (FOD). Novel EBC chemistries, creative EBC designs, and robust processes are required to meet EBC durability challenges. Engine-relevant testing, characterization, and lifing methods need to be developed to improve EBC reliability. The aim of this Special Issue is to present recent advances in EBC technology to address these issues. In particular, topics of interest include but are not limited to the following: • Novel EBC chemistries and designs; • Processing including plasma spray, suspension plasma spray, solution precursor plasma spray, slurry process, PS-PVD, EB-PVD, and CVD; • Testing, characterization, and modeling; • Lifing.