Reactions of calcium orthosilicate and barium zirconate with oxides and sulfates of various elements
Technical Report
·
OSTI ID:5795490
Calcium orthosilicate and barium zirconate were evaluated as the insulating layer of thermal barrier coatings for air-cooled gas turbine components. Surface temperatures of such coatings might reach 1300 to 1400/sup 0/C in hot spot locations. Thus chemical stability of these compounds was studied at 1100 and 1300/sup 0/C in the presence of some oxides and sulfates for times to 400 and 200 hours respectively. The oxides and sulfates studied represent some of the oxidation products of impurities found in the combustion air, or the fuels as well as the elements in the bond coat alloys. These compounds are listed below, according to their reactivity with calcium orthosilicate (actual composition was 1.78 CaO.SiO/sub 2/) and barium zirconate. When comparing these results with data available for reactions between similar compounds and ZrO/sub 2/-8w/oY/sub 2/O/sub 3/, it can be noted that all three materials reacted with SiO/sub 2/, P/sub 2/O/sub 5/, and V/sub 2/O/sub 5/. Also, zirconia was susceptible to attack by alkali and alkaline earth metal oxides. Calcium orthosilicate and barium zirconate were not susceptible to such attack but reacted readily with Al/sub 2/O/sub 3/ and Cr/sub 2/O/sub 3/, which did not react with ZrO/sub 2/-8w/oY/sub 2/O/sub 3/.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- DOE Contract Number:
- EF-77-A-01-2593
- OSTI ID:
- 5795490
- Report Number(s):
- DOE/NASA/2593-79/9; NASA-TM-79272
- Country of Publication:
- United States
- Language:
- English
Similar Records
Review of NASA progress in thermal barrier coatings for stationary gas turbines
Reactions of yttria-stabilized zirconia with oxides and sulfates of various elements. [8 wt % yttria, 1200 to 1400/sup 0/C]
SOLID SOLUTIONS OF LANTHANUM ORTHOSILICATES IN A DI-CALCIUM SILICATE
Conference
·
Wed Dec 31 23:00:00 EST 1980
·
OSTI ID:5663422
Reactions of yttria-stabilized zirconia with oxides and sulfates of various elements. [8 wt % yttria, 1200 to 1400/sup 0/C]
Technical Report
·
Sat Jul 01 00:00:00 EDT 1978
·
OSTI ID:6700072
SOLID SOLUTIONS OF LANTHANUM ORTHOSILICATES IN A DI-CALCIUM SILICATE
Journal Article
·
Wed Oct 31 23:00:00 EST 1962
· Zh. Prikl. Khim.
·
OSTI ID:4765634
Related Subjects
20 FOSSIL-FUELED POWER PLANTS
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
GAS TURBINES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
STABILITY
SULFATES
SULFUR COMPOUNDS
THERMAL INSULATION
TRANSITION ELEMENT COMPOUNDS
TURBINES
TURBOMACHINERY
ZIRCONATES
ZIRCONIUM COMPOUNDS
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
GAS TURBINES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
STABILITY
SULFATES
SULFUR COMPOUNDS
THERMAL INSULATION
TRANSITION ELEMENT COMPOUNDS
TURBINES
TURBOMACHINERY
ZIRCONATES
ZIRCONIUM COMPOUNDS