NASA SBIR 2003 Solicitation

FORM B - PROPOSAL SUMMARY


PROPOSAL NUMBER:03-A4.03-7125 (For NASA Use Only - Chron: 035882)
SUBTOPIC TITLE:Lightweight Propulsion Components
PROPOSAL TITLE:Interface coatings for Carbon and Silicon Carbide Fibers in Silicon Carbide Matrixes

SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Synterials, Inc
318 Victory Drive
Herndon ,VA 20170 - 5216
(703) 471 - 9310

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Daniel R Petrak
dpetrak@synterials.com
318 Victory Drive
Herndon ,VA  20170 -5216
(703) 471 - 9310
U.S. Citizen or Legal Resident: Yes

TECHNICAL ABSTRACT (LIMIT 200 WORDS)
Interface coatings for fiber-reinforced composites are an enabling
technology for high temperature ceramic matrix composites. Because of
their availability and relative cost, graphite fibers are preferred for
many structural composite of interest for space propulsion applications.
However, high temperature stable silicon carbide fibers are also of
interest, even though they are higher cost. Recent work at Synterials,
has suggested that a thin layer of carbon at the surface of the fiber is
key to preventing corrosion of the fiber and subsequent fiber strength
reduction on graphite fibers. The proposed work will evaluate three
interface coatings one three graphite fibers and one silicon carbide
fiber. The coating are: B4C, Si-doped BN/Si3N4 and HfC. The coatings
will be evaluated by preparing mini-composites via a polymer plus CVI
processing route.

POTENTIAL NASA COMMERCIAL APPLICATIONS (LIMIT 150 WORDS)
These materials should find application in commercial and military
aerospace engines as well as power generation components.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (LIMIT 150 WORDS)
A successful demonstration of this technology will have utility for many
high temperature structural applications. These should include control
surfaces, and engine components for advanced reusable launce vehicles.