Surface Treatment for Graphite Fiber Composites

Award Information
Agency:
Department of Defense
Branch
Missile Defense Agency
Amount:
$56,610.00
Award Year:
1992
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
18099
Agency Tracking Number:
18099
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
3754 Hawkins Ne, Albuquerque, NM, 87109
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Richard W. Brotzman, Phd
(505) 345-5668
Business Contact:
() -
Research Institution:
n/a
Abstract
High performance graphite/resin composites have not realized their potential because they have poor interface-dependent mechanical properties that degrade by as much as 65% under hot-wet conditions. An RF-plasma/wet-chemistry fiber surface treatment is proposed to establish covalent bonding between the graphite fiber/resin matrix interface. The plasma process will establish reactive moieties on the relatively inert crystallite basal plane of the graphite fiber. The wet-chemical treatment will covalently bond the resin matrix to the reactive plasma-generated moieties thus forming the interfacial covalent bond. The covalently bonded interfaces will improve interface-dependent mechanical properties by at least 50% and prevent degradation of these properties under hot-wet conditions. Prior work that established interfacial covalent bonds in OCF S-2 glass/polysulfone composites demonstrated that interface-dependent mechanical properties degraded by less than 8% during 106 degree C-9 RH aging conditions. Basal plane reactivity treatments will be conducted in a spectrometer-controlled plasma research reactor facility. Titration, IGC, surgace energetics and ESCA techniques will characterize the graphite surface. Processes will be developed for wet-chemical bonding. Peel tests of two-ply laminates subjected to hot-wet aging will provide proof of increased interfacial adhesion.

* information listed above is at the time of submission.

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