Novel molecular sources for dispersing boron in carbon-carbon composites. Final report, 1 Jun-30 Nov 91

Technical Report · Tue Dec 31 04:00:00 EST 1991

OSTI ID:5651023

Chen, P S; Stevens, W C

Improving the oxidation resistance of carbon-carbon composites is key to expanding the use of this material system into higher temperature applications. While boron particles have been added to these materials to seal cracks in protective coatings, oxidation of the carbon matrix neighboring the boron particles seriously affects composite strength. This problem is exacerbate by a natural segregation of the boron particles to fiber rich areas of the composites. Carborane, a robust molecular source of boron, was used as the precursor for atomically dispersed boron in a phenolic derived carbon matrix. Modifications of the chemical structure of carborane were used to improve the solubility in phenolic. Additions of carboranes into the phenolic resins dramatically improved the oxidation resistance of the carbonized char. The char yield of the phenolic resin was also increased significantly.

• Research Organization: Advanced Technology Materials, Inc., Danbury, CT (United States)
• OSTI ID: 5651023
• Report Number(s): AD-A-246999/7/XAB; CNN: F49620-91-C-0046
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360604* -- Materials-- Corrosion
Erosion
& Degradation
BORON
BORON COMPOUNDS
CARBON
CARBON COMPOUNDS
CARBORANES
CHEMICAL REACTIONS
COATINGS
COMPOSITE MATERIALS
CORROSION RESISTANCE
CRACKS
DISPERSIONS
ELEMENTS
MATERIALS
MATRIX MATERIALS
NONMETALS
ORGANIC BORON COMPOUNDS
ORGANIC COMPOUNDS
OXIDATION
PARTICLES
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
PROTECTIVE COATINGS
SEMIMETALS
SOLUBILITY
SYNTHESIS
SYNTHETIC MATERIALS