Diamond Fiber for Thermal Energy Management

Period of Performance: 02/18/1993 - 02/18/1995

$492K

Phase 2 SBIR

Recipient Firm

Applied Sciences, Inc.
141 W. Xenia Ave. Array
Cedarville, OH 45314
Principal Investigator

Abstract

Applied Sciences, Inc. (ASI) has been active in the development of a novel graphite fiber with a thermal conductivity approaching that of diamond. This fiber has been produced by chemical bapor deposition (CVD) processing in a fashion similar to the reported technique for diamond whisker production. Also, ASI has contributed to the diamond film technology, developing methods of deposition of diamond on a variety of materials. In a Phase I SBIR program sponsored by BMDO, ASI has combined the techniques for production of both of these carbon allotropes to produce a diamond filament. It is herein proposed to exploit this finding to develop a commercially viable diamond fiber for use in metal matrix and carbon/carbon, and diamond/epoxy composites for high thermal conductivity. Successful development of this type of fiber could allow the fabrication of a dielectric heat sink material having a thermal conductivity of 600 W/m-k in three orthogonal directions, as well as having a CTE which is tailorable within the range of 2 to 8 ppm/C over a temperature range from 25 C to 400 C. This material would have extensive applications in electronics and high performance space and aerospace vehicles.