Oxidation-protection systems for carbon-carbon composites formed by chemical vapor deposition and plasma-assisted chemical-vapor-deposition techniques. Final report, 1 Mar 88-28 Feb 91
This final report is written in three sections. (1) 'CVI Densification of Carbon-Carbon Composites' deals with the densification of porous preforms of carbonized carbon-resin mixtures using various methane and hydrogen gas mixtures. The experimental conditions include temperatures between 1000 deg C and 1200 deg C and total pressures between 5 and 15 torr. The resulting solid was characterized using optical and electron microscopy. (2) 'Oxidation Protection of Carbon-Carbon Composites Using Pack Cementation' deals with formation of oxidation protective films formed from combinations of boron carbide, silicon carbide and zirconium carbide. Films were processed using a reactive process called pack cementation. The effects of initial powder composition and temperature were correlated with microstructure and oxidation resistance. (3) In 'The Formation of Oxidation Protective Coatings on Carbon-Carbon Composites Using a Chemical Vapor Deposition (CVD) Technique four types of CVD coatings were investigated: SiC, ZrB ZrB /SiC multilayer and graded SrC/ZrC. Coatings were produced as a function of temperature, pressure and gas flow rates. The resulting coatings were then characterized in terms of microstructure and oxidation resistance. OXIDATION RESISTANCE, CHEMICAL VAPOR DEPOSITION, CARBON-CARBON.
- Research Organization:
- Southern Illinois Univ., Carbondale, IL (United States). Materials Technology Center
- OSTI ID:
- 7142857
- Report Number(s):
- AD-A-253450/1/XAB; CNN: AFOSR-88-0130
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON
CORROSION RESISTANCE
PROTECTIVE COATINGS
COMPOSITE MATERIALS
CHEMICAL VAPOR DEPOSITION
BORON
BORON CARBIDES
CARBIDES
COATINGS
DENSITY
DEPOSITION
ELECTRON MICROSCOPY
ELECTRONS
FILMS
GAS FLOW
HYDROGEN
METHANE
MICROSTRUCTURE
MIXTURES
OXIDATION
PLASTICS
POWDERS
SILICON
SILICON CARBIDES
SOLIDS
STRONTIUM
VAPORS
ZIRCONIUM
ALKALINE EARTH METALS
ALKANES
BORON COMPOUNDS
CARBON COMPOUNDS
CHEMICAL COATING
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DISPERSIONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FLUID FLOW
FLUIDS
GASES
HYDROCARBONS
LEPTONS
MATERIALS
METALS
MICROSCOPY
NONMETALS
ORGANIC COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
SEMIMETALS
SILICON COMPOUNDS
SURFACE COATING
SYNTHETIC MATERIALS
TRANSITION ELEMENTS
360601* - Other Materials- Preparation & Manufacture
360604 - Materials- Corrosion
Erosion
& Degradation