| Download | - View author's version: Environmental, economical and performance impacts of Ar/H2 & N2/H2 plasma sprayed YSZ TBCs (PDF, 825 KiB)
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| Author | Search for: Lima, Rogerio1; Search for: Guerreiro, Bruno1; Search for: Curry, Nicholas; Search for: Leitner, Matthias; Search for: Komer, Karl |
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| Affiliation | - National Research Council Canada. Automotive and Surface Transportation
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| Format | Text, Article |
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| Conference | ITSC 2019, International Thermal Spray Conference and Exposition: New Waves of Thermal Spray Technology for Sustainable Growth, May 25-29, 2019, Yokohama, Japan |
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| Abstract | Since the 1970s the Ar/H2 plasma has been the standard APS gas system employed to deposit YSZ TBCs for the gas turbine industry, particularly regarding the legacy plasma spray torches. Although much less costly and yielding higher YSZ deposition efficiency (DE) levels, N2/H2 plasmas did not become the main stream plasma system. This N2/H2 issue occurred likely due to problems like preliminary APS torch Cu-nozzle erosion (Cu contamination on TBCs) and the tendency to produce denser coatings; potentially leading to TBCs exhibiting higher thermal conductivity (TC) and lower thermal cycle lifetimes. However, in the 21st century, environmental impact and economical aspects are becoming paramount. In addition, the introduction of new technologies (e.g., W-lined Cu nozzles, particle T & V sensors and computer-controlled automation) has increased dramatically the stability and reproducibility of APS processing. Therefore, the N2/H2 plasma concept needs to be revisited with respect to the legacy plasma spray torches; which are still highly used by the gas turbine industry OEMs and service centres worldwide. In this paper different sets of APS YSZ TBCs were deposited via Ar/H2 and N2/H2 plasmas (3MB torch). The DE, TC and furnace cycle test (FCT) were evaluated. The top-performing Ar/H2 and N2/H2 TBCs exhibited equivalent FCT lifetimes and TC values within the 1.15-1.25 W/mK range at 1200oC. Moreover, the top-performing N2/H2 TBC exhibited a 2-fold increase in DE and an overall 55% reduction in production cost when compared to the top-performing Ar/H2 TBC. |
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| Publication date | 2019-05-29 |
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| Publisher | ASM International |
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| Other version | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRC-AST-5 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 1e043e75-7632-43a5-88f4-0d020891de34 |
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| Record created | 2019-06-25 |
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| Record modified | 2020-04-08 |
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