Development of adherent ceramic coatings to reduce contact stress damage of ceramics
- GTE Labs., Inc., Waltham, MA (United States)
Strongly adherent coatings were deposited on reaction bonded Si[sub 3]N[sub 4] (RBSN), sintered SiC (SSC), and HIP'ed Si[sub 3]N[sub 4] (HSN) and using a newly developed chemical vapor deposition (CVD) process. Performance of the coating was assessed by oxidation, strength and contact stress testing. A new method was developed to experimentally determine the strength and Weibull modulus of thin brittle films on ceramic substrates. A significant portion of the study was devoted to numerical modeling of the coatings in order to understand the contributions of residual stress as different coating materials and thicknesses were combined. Coating designs were further analyzed by simulating the crack growth behavior in multilayer films while accounting for the interface fracture mechanics. This work has shown that the Al[sub 2]0[sub 3+]ZrO[sub 2] composite coating developed in this program can provide resistance to oxidation and contact stress. Commercial application of the composite coating has been successfully demonstrated by useof the Al[sub 2]0[sub 3+]ZrO[sub 2] composite as a protective coating on a Si[sub 3]N[sub 4] cutting tool.
- Research Organization:
- Oak Ridge National Lab., TN (United States); GTE Labs., Inc., Waltham, MA (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6623608
- Report Number(s):
- ORNL/Sub-89-95915/2; ON: DE93012518
- Country of Publication:
- United States
- Language:
- English
Similar Records
High temperature coating study to reduce contact stress damage of ceramics: Final report. [ZrO/sub 2/ coatings on Si/sub 3/N/sub 4/ and SiC against contact stress]
Materials development and evaluation for the ceramic helical expander
Related Subjects
330100 -- Internal Combustion Engines
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM NITRIDES
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL REACTIONS
CHEMICAL VAPOR DEPOSITION
COATINGS
COMPOSITE MATERIALS
CUTTING TOOLS
DEPOSITION
DOCUMENT TYPES
ENGINES
FRACTURE PROPERTIES
FRICTION
HEAT ENGINES
LAYERS
MATERIALS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
PROGRESS REPORT
PROTECTIVE COATINGS
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
SURFACE COATING
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TOOLS
TRANSITION ELEMENT COMPOUNDS
WEAR
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES