HIGH TEMPERATURE ADVANCED STRUCTURAL CERAMICS

Award Information
Agency:
Department of Energy
Amount:
$50,000.00
Program:
SBIR
Contract:
N/A
Solitcitation Year:
N/A
Solicitation Number:
N/A
Branch:
N/A
Award Year:
1988
Phase:
Phase I
Agency Tracking Number:
7718
Solicitation Topic Code:
N/A
Small Business Information
Materials & Electrochemical Rs
4233 South Fremont Avenue, Tucson, AZ, 85714
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
N
Duns:
N/A
Principal Investigator
 () -
Business Contact
 Dr J C Withers
Phone: (602) 746-9442
Research Institution
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.

Agency Micro-sites

US Flag An Official Website of the United States Government