Fatigue of thick thermal barrier coatings

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb07063.x· OSTI ID:6888953

Wesling, K F; Socie, D F ^[1]; Beardsley, B ^[2]

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1. Univ. of Illinois, Urbana, IL (United States). Mechanical Engineering Dept.
2. Caterpillar Inc., Peoria, IL (United States)

Thick thermal barrier coatings (TTBCs) of plasma-sprayed 8% Y[sub 2]O[sub 3]-ZrO[sub 2] were fatigued in compression as part of a reliability and durability study to evaluate their potential use in high-performance diesel engines. Test specimens were designed to test the bulk ceramic uniaxially, independent of the substrate. A test machine was designed to alleviate the mechanical gripping and alignment difficulties associated with cyclically stressing brittle ceramics in compression. Higher fatigue limits, 375 vs 200 MPa, were observed at 800 C than at room temperature. Specimens tested at room temperature after high-temperature compressive cycling also had higher fatigue limits, indicating that the strengthening was permanent. At temperatures of 800 C, the coatings showed evidence of low-temperature, pressure-induced sintering. The extent to which sintering occurred was determined by studying the change in the elastic modulus as a result of the application of varying temperatures and static stresses.

• OSTI ID: 6888953
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:7; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330102 -- Internal Combustion Engines-- Diesel
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CHALCOGENIDES
DIESEL ENGINES
ENGINES
FATIGUE
HEAT ENGINES
HEAT RESISTANT MATERIALS
INTERNAL COMBUSTION ENGINES
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
OXIDES
OXYGEN COMPOUNDS
TEMPERATURE DEPENDENCE
TESTING
THERMAL SHOCK
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES