Ceramic-fiber coating development and demonstration. Annual technical report, 1 Jul 89-31 Dec 90
Technical Report
·
OSTI ID:5392172
The objective of this program is to develop fiber coating techniques by gas phase and liquid phase processes. Thermochemical evaluation of fiber/coating/matrix systems was completed. Experimental studies on chemical and mechanical interaction between coating and substrate materials indicate no reaction zones in samples treated up to 1400 C. Mechanical tests revealed that the strength of interfaces decreases with increasing temperature treatment. Nicalon, Nextel and FR-PRD-166 fibers were coated with SiC and Si3N4 from preceramic polymer solutions. The same fibers were coated with Y2O3, Al2O3, MgAl2O4. YAlO3 and MgO from aqueous nitrate sols. Tensile strengths for Y2O3 coated Nicalon are comparable to as received fibers while Al2O3 coated Nicalon exhibits a 20% degradation. Nicalon, HPZ, Nextel and FP-PRD-166 were CVD coated with SiC. TEM data for Al2O3 coatings show evidence of crystallinity above 800 C annealing temperature.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- OSTI ID:
- 5392172
- Report Number(s):
- AD-A-234773/0/XAB; GA-C--20422; CNN: F49620-89-C-0078; ARPA Order-6808
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COATINGS
COMPOSITE MATERIALS
DATA
DEPOSITION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FIBERS
FLUIDS
GASES
HYDROGEN COMPOUNDS
INFORMATION
INTERACTIONS
INTERFACES
LIQUIDS
MAGNESIUM COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
NITRATES
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
POLYMERS
RESEARCH PROGRAMS
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
SUBSTRATES
SURFACE COATING
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VAPORS
WATER
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COATINGS
COMPOSITE MATERIALS
DATA
DEPOSITION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FIBERS
FLUIDS
GASES
HYDROGEN COMPOUNDS
INFORMATION
INTERACTIONS
INTERFACES
LIQUIDS
MAGNESIUM COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
NITRATES
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
POLYMERS
RESEARCH PROGRAMS
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
SUBSTRATES
SURFACE COATING
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VAPORS
WATER
YTTRIUM COMPOUNDS
YTTRIUM OXIDES