High Temperature Structural Materials for Advanced Air Force Systems

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$80,000.00
Award Year:
1995
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
28203
Agency Tracking Number:
28203
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
7960 S. Kolb Rd, Tucson, AZ, 85706
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr S Guha
(602) 574-1980
Business Contact:
() -
Research Institute:
n/a
Abstract
Conventional composite processing techniques are presently unable to fabricate Al1O3-fiber reinforced y-titanium aluminide matrix composites based on low cost, small diameter ( 5-20um) fibers. The primary problem is one of infiltration of the matrix in between the fibers without any degradation in fiber properties. Although pressure casting would be a low cost processing approach, the severe chemical attack by molten metals would limit the performance of these composites. Instead, an innovative composite processing technique for TiAl-based composites will be demonstrated wherein, starting with a commercial Al2O3 fiber tow, each fiber will be spread and individually coated with the matrix material by a plasma-assisted hollow cathode sputtering process. The fiber volume fraction within the matrix can be varied by varying the thickness of the coating. By coating all the fibers to a given thickness, a more or less constant inter -fiber spacing can be obtained in a hot-consolidated state. Such a composite processing technique is also amenable to tailoring of the fiber-matrix interface by the addition of vary thin coat of metals such as Nb for improved resistance to chemical attack by the matrix. This Nb layer can also act as a compliant layer, thereby improving the thermal cycling performance of these composites.

* information listed above is at the time of submission.

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