SURFACE STRENGHTHENING OF ADVANCED CERAMICS BY A THIN COMPOSITE SKIN

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: N/A
Agency Tracking Number: 18356
Amount: $497,538.00
Phase: Phase II
Program: SBIR
Awards Year: 1994
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Technology Assessment &
133 Defense Hwy., #212, Annapolis, MD, 21401
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Edward Paquette
 (301) 261-8373
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THE OBJECTIVE OF THIS PHASE I SBIR PROJECT IS TO DEMONSTRATE THAT A MONOLITHIC CERAMIC CORE-COMPOSITE SKIN STRUCTURE HAS SIGNIFICANTLY INCREASED FRACTURE TOUGHNESS AS COMPARED TO THE CORE MATERIAL, WHILE SUBSTANTIALLY MAINTAINING ITS FLEXURAL STRENGTH. THE CORE MATERIAL IS REACTION BONDED SILICON NITRIDE, A FORMABLE AND RELATIVELY INEXPENSIVE STRUCTURAL CERAMIC. THE COMPOSITE SKIN IS A CHEMICAL VAPOR INFILTRATION PROCESSED SIC MATRIX WITH SIC, SI3N4, OR ALUMINOSILICATE FIBER REINFORCEMENT. A FURTHER OBJECTIVE IS THE DEVELOPMENT OF A LOW COST MICROWAVE-BASED FABRICATION PROCESS, FOR WHICH PHASE I FEASIBILITY WILL BE DEMONSTRATED VIA MICROWAVE IN SITU NITRIDING OF THE GREEN RBSN CORE. ANTICIPATED BENEFITS: THIS CORE-SKIN STRUCTURE APPROACH IS EXPECTED TO PROVIDE COMPOSITE BEHAVIOR WITHOUT THE EXPENSE OF FABRICATING THICK SECTION COMPOSITES. IF SUCCESSFUL, THIS WOULD MAKE THE CERAMIC CORE-COMPOSITE SKIN STRUCTURES COST-EFFECTIVE FOR SUCH COMPONENTS AS COMBUSTOR LINERS, HOT SECTION COMPONENTS AND NOZZLES IN AEROSPACE AND COMMERCIAL TURBINE ENGINES.

* information listed above is at the time of submission.

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