Finishing Process to Improve Interfacial Bonding in SiC/BMI Composites

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-07-C-0057
Agency Tracking Number: N051-025-0601
Amount: $1,000,000.00
Phase: Phase II
Program: SBIR
Awards Year: 2006
Solicitation Year: 2005
Solicitation Topic Code: N05-025
Solicitation Number: 2005.1
Small Business Information
9621 Camino del Sol NE, Albuquerque, NM, 87111
DUNS: 859106296
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Ronald Allred
 President
 (505) 346-1685
 reallred@comcast.net
Business Contact
 Susan Switzer
Title: Admin Projects Manager
Phone: (505) 346-1685
Email: adherenttech@comcast.net
Research Institution
N/A
Abstract
High-temperature (HT) polymer matrix composites (PMCs) are desired for many aerospace and military applications. Silicon carbide (SiC) fibers provide a potentially attractive reinforcement for HT PMCs for applications ranging from propulsion systems to structures for the orbiting space plane. The sizings routinely added to commercial SiC fibers are not compatible with the new HT matrix resins. The result is that the thermo-oxidative stability (TOS) and mechanical properties of composites made with such fibers are compromised. A need exists for a SiC fiber adhesion promoting finish that is compatible with high-temperature bismaleimide (BMI) and polyimide (PI) chemistries. Previous work at Adherent Technologies, Inc. has revealed chemistries that chemically bond to fiber surfaces and high-temperature curing matrix resins. Composites fabricated with finishes based on reactive coupling agent chemistries show substantially higher interface-dependent properties, TOS, and moisture resistance. Those chemistries will be modified to function with the SiC fiber surface and BMI and AFR-PE-4 PI moieties during cure. SiC/PMC composites will be fabricated for mechanical testing and moisture and thermal aging studies. Results are expected to show superior interfacial strength and environmental durability. It is also expected that the finishes will serve as weaving and prepregging aids.

* Information listed above is at the time of submission. *

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