Investigation of the Yttria Stabilized Zirconia (100) Surface by X-ray Photoelectron Spectroscopy and Scanning Probe Microscopy PDF Download
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Author: Richard Gregory Green
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages : 462
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Author: Richard Gregory Green
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages : 462
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Author: American Ceramic Society
Publisher:
ISBN:
Category : Ceramics
Languages : en
Pages : 1150
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Author: National Institute of Standards and Technology (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 1162
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Author: Nils Ohmer
Publisher:
ISBN:
Category :
Languages : en
Pages : 264
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Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 568
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Author: Dean M. Krestos
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
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Since the mid 1970's the U.S. Navy has used Yttria-stabilized zirconia (YSZ) as thermal barrier coatings for hot stage gas turbine components. Use of low cost, high contaminant, fuels has led to shortened component life from failure of YSZ coatings due to corrosive attack by vanadium and other combustion oxides. The object of this investigation was to determine the reactivity of adding alpha-Al203 to Current YSZ ceramics for creation of a ceramic composite which could improve mechanical properties and show improved durability to corrosive chemical attack. Ten powder samples of Zro2(8)Mol%YzO3, alpha-Al2O3, and V20s5 of varying compositions were annealed at 900 deg C for 100 hours. X-Ray Diffraction analysis utilizing a standard 'search and match' method was used to determine the phases present in the reacted powder samples. Peak intensity comparisons between reacted and un-reacted samples allowed for a quantitative determination for the reactivity of a-A1203 with the YSZ system exposed to V2O3. This investigation indicated that alpha-Al2O3 is non-reactive in all YSZ samples exposed to V205 at 900 deg C. Ceramic, Alpha alumina, YSZ, Vanadia, Surface-induced coating (SIC), PSZ, XRD, SEM.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 79
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Book Description
Since the mid 1970's the U.S. Navy has used Yttria-stabilized zirconia (YSZ) as thermal barrier coatings for hot stage gas turbine components. Use of low cost, high contaminant, fuels has led to shortened component life from failure of YSZ coatings due to corrosive attack by vanadium and other combustion oxides. The object of this investigation was to determine the reactivity of adding alpha-Al203 to Current YSZ ceramics for creation of a ceramic composite which could improve mechanical properties and show improved durability to corrosive chemical attack. Ten powder samples of Zro2(8)Mol%YzO3, alpha-Al2O3, and V20s5 of varying compositions were annealed at 900 deg C for 100 hours. X-Ray Diffraction analysis utilizing a standard 'search and match' method was used to determine the phases present in the reacted powder samples. Peak intensity comparisons between reacted and un-reacted samples allowed for a quantitative determination for the reactivity of a-A1203 with the YSZ system exposed to V2O3. This investigation indicated that alpha-Al2O3 is non-reactive in all YSZ samples exposed to V205 at 900 deg C. Ceramic, Alpha alumina, YSZ, Vanadia, Surface-induced coating (SIC), PSZ, XRD, SEM.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 52
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The U.S. Navy sometimes has the requirement to use low cost fuels containing significant amounts of vanadium and sulfur in gas turbine engines. Unfortunately the yttria stabilized zirconia (YSZ) witch is used as a thermal barrier coating on gas turbine blades can be severely attacked by vanadia. Powders of YSZ containing 8-mol% Y203 and pure zirconia containing various and mounts Of V205 were annealed at 900 deg. C. These were then examined by X-ray diffraction and electron microscopy, as well as single crystals of pure ZrO2 and YSZ (20% Wt Y203) exposed to V205 Melts, to study how the vanadia degrades the YSZ by reacting with the stabilizer to form YVO4 and how the vanadium transforms the cubic and tetragonal YSZ crystal structures to monoclinic which degrades rapidly as a gas turbine blade coating.
Author: Mary Elizabeth Trahanovsky
Publisher:
ISBN:
Category :
Languages : en
Pages : 388
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Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 2566
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