Processing of Metal Matrix Composites with Controlled Microstructures

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$600,000.00
Award Year:
1995
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
22736
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Materials & Electrochemical
7960 South Kolb Road, Tucson, AZ, 85706
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Sumit Guha
(602) 574-1980
Business Contact:
() -
Research Institution:
n/a
Abstract
Conventional composite processing techniques are presently unable to fabricate unidirectional fiber reinforced composites based on small diameter fibers, for example, ~5-20 um in diameter. The primary problem is one of infiltration of the matrix in between the fibers and maintaining a reasonably constant fiber spacing. An innovative MMC processing technique is proposed wherein, starting with a ceramic fiber tow, each fiber would be spread and individually coated with the matrix material by a plasma-assisted sputtering process. The continuous coated fiber can then be utilized in a variety of ways, such as fiber lay-up for uniaxial panels or weaving in 2 or 3 dimensional architecture, followed by hot consolidation to obtain advanced composites with desired fiber orientation. Such a composite processing technique is also amenable to tailoring of the fiber-matrix interface by the addition of a very thin coat of metals such as Cr or Ti (which improve adhesion of the matrix to the fiber) prior to deposition of the matrix in a single step. Further, 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, an uniform fiber spacing can be obtained in a hot-consolidated state. This composite processing technique is also flexible enough to accommodate a starting compliant/compensating layer, if necessary, to improve the thermal cycling performance of these composites (especially those based on relatively brittle matrices).

* information listed above is at the time of submission.

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