NDLI: Thermal conductivity and water vapor stability of ceramic hfo2-based coating materials

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Thermal conductivity and water vapor stability of ceramic hfo2-based coating materials

Content Provider	NASA Technical Reports Server (NTRS)
Author	Zhu, Dong-Ming Miller, Robert A. Fox, Dennis S. Bansal, Narottam P.
Copyright Year	2004
Description	HfO2-Y2O3 and La2Zr2O7 are candidate thermal/environmental barrier coating materials for gas turbine ceramic matrix composite (CMC) combustor liner applications because of their relatively low thermal conductivity and high temperature capability. In this paper, thermal conductivity and high temperature phase stability of plasma-sprayed coatings and/or hot-pressed HfO2-5mol%Y2O3, HfO2-15mol%Y2O3 and La2Zr2O7 were evaluated at temperatures up to 1700 C using a steady-state laser heat-flux technique. Sintering behavior of the plasma-sprayed coatings was determined by monitoring the thermal conductivity increases during a 20-hour test period at various temperatures. Durability and failure mechanisms of the HfO2-Y2O3 and La2Zr2O7 coatings on mullite/SiC Hexoloy or CMC substrates were investigated at 1650 C under thermal gradient cyclic conditions. Coating design and testing issues for the 1650 C thermal/environmental barrier coating applications will also be discussed.
File Size	16458551
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20050215454
Archival Resource Key	ark:/13960/t87h6jp5m
Language	English
Publisher Date	2004-01-01
Access Restriction	Open
Subject Keyword	Composite Materials Temperature Dependence Lanthanum Oxides Ceramic Matrix Composites Stability Hafnium Oxides Water Vapor Steady State Substrates Hot Pressing Gas Turbines Zirconium Oxides Spalling Thermal Conductivity Plasma Spraying Yttrium Oxides Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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