HIGH TEMPERATURE ADVANCED STRUCTURAL CERAMICS

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$50,000.00
Award Year:
1988
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
7718
Agency Tracking Number:
7718
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
4233 South Fremont Avenue, Tucson, AZ, 85714
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
() -
Business Contact:
Dr J C Withers
(602) 746-9442
Research Institute:
n/a
Abstract
CURRENT INVESTIGATIONS HAVE SHOWN HOW WHISKER REINFORCEMENT HAS INCREASED THE FRACTURE TOUGHNESS OF SIC-WHISKER/CERAMIC-MATRIX COMPOSITES. HOWEVER, IT WAS FOUND THAT THE STRENGTH OF THE COMPOSITES DECREASED AS A RESULT OF FLAWS INTRODUCED WITH THE WHISKER ADDITION AND THEPOOR SINTERABILITY OF SI(3)N(4). EXTERNAL PRESSURE HAS TO BE INTRODUCED (E.G. BY HOT-PRESSING OR HOT-ISOSTATIC PRESSING) FOR ELIMINATING THE FLAWS. SIALON CERAMICS CAN REACH ALMOST FULL DENSITY THROUGH PRESSURELESS SINTERING, AND THEY ALSO OFFER THE SAME SIGNIFICANCE IN HIGH TEMPERATURE MECHANICAL PROPERTIES AS SI(3)N(4). DENSIFICATION AND STRENGTHENING BY TRANSIENT LIQUID PHASE SINTERING (TLPS) HAS BEEN EXPLORED. HOWEVER, COMBINING WHISKER REINFORCEMENT WITH TLPS HAS NOT PREVIOUSLY BEEN DEMONSTRATED. THIS PROJECT UTILIZES UNIQUE SINTERABILITY OFSIALON, TLPS, AND SIC WHISKER REINFORCEMENT TO OBTAIN FLAW FREE, HOMOGENEOUS AND HIGH TEMPERATURE (>1400 DEGREES CENTIGRADE) STRENGTH COMPOSITES THROUGH PRESSURELESS SINTERING.

* information listed above is at the time of submission.

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