A NOVEL TECHNIQUE TO FABRICATE TIB(2) FIBERS DIRECTLY FROM MELT

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: N/A
Agency Tracking Number: 9907
Amount: $50,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1989
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Marko Materials Inc
144 Rangeway Rd, North Billerica, MA, 01862
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr Ranjan Ray
 (508) 663-2210
Business Contact
Phone: () -
Research Institution
N/A
Abstract
DEVELOPMENT OF SUITABLE REINFORCEMENT FIBERS FOR HIGH TEMPERATURE COMPOSITE MATERIALS IS THE MAJOR TECHNICAL BARRIER LIMITING THE INTRODUCTION OF THESE NEW MATERIALS FOR ADVANCED AIRCRAFT ENGINES. WE PROPOSE TO FABRICATE MONOFILAMENT TIB(2) FIBERS USING A NOVEL CONCEPT. THE CHOICE OF TIB(2) FIBERS IS BASED ON ITS CHEMICAL COMPATIBILITY WITH ALUMINIDE MATRICES, HIGHER COEFFICIENTS OF THERMAL EXPANSION AND ELASTIC MODULUS, AND LOWER DENSITY COMPARED TO OTHER CANDIDATE REINFORCEMENT FIBERS. IN THE FIRST STEP OF THE PROPOSED NOVEL FABRICATION TECHNIQUE, WE WILL OBTAIN A B RICH TI FILAMENT DIRECTLY FROM THE MELT USING AN ADVANCED MELT SPINNING TECHNIQUE. IN THE SECOND STEP THE B RICH TI FILAMENT WILL BE COATED WITH LOWCOST B COATINGS USING AN INNOVATIVE CHEMICAL VAPOR DEPOSITION (CVD) PROCESS THAT COMBINES THE LOW COST OF PACK METALLIZATION WITH THE HIGH HEAT AND MASS TRANSFER OF A FLUIDIZED BED REACTOR. WE WILL CHARACTERIZE THE MECHANICAL AND MICROSTRUCTURAL PROPERTIES OF THE TIB(2) FIBERS FABRICATED USING THE ABOVE TECHNIQUE, GIVING PARTICULAR ATTENTION TO THE EXTENT OF DEGREE OF DIFFUSION AND REACTION BETWEEN THE B RICH TI SUBSTRATE AND B COATING. THE LOW COST B COATINGS VIA CVD IN A FLUIDIZED BED REACTOR WILL BE PERFORMED IN COLLABORATION WITH DRS. ANGEL SAN JURJO AND DIGBY MACDONALD OF SRI INTERNATIONAL, MENLO PARK, CA.

* information listed above is at the time of submission.

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