COMPARISON AND EVALUATION OF GAS ANALYZERS AS IN-PROCESS SENSORS FOR THE INTELLIGENT PROCESSING OF CARBON/CARBON COMPOSITES

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: N/A
Agency Tracking Number: 5844
Amount: $49,886.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Timeline
Solicitation Year: N/A
Award Year: 1987
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
Biddeford Industrial Pk, Biddeford, ME, 04405
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 JAMES C FEDUSKA
 (207) 282-5911
Business Contact
Phone: () -
Research Institution
N/A
Abstract
CARBON/CARBON COMPOSITES ARE HIGH STRENGTH MATERIALS WHICH WILL BE INCREASINGLY USED IN ADVANCED AEROSPACE AND DEFENSE SYSTEMS. AS MATERIAL PERFORMANCE REQUIREMENTS BECOME MORE STRINGENT, THE CURRENT PROCESS CONTROL METHODS WILL BECOME INADEQUATE AND MANUFACTURING VARIABILITIES WILL IMPACT ON SYSTEM PERFORMANCE, COST AND RELIABILITY.CURRENT MANUFACTURING SYSTEMS RELY HEAVILY ON TEMPERATURE AND PRESSURE SENSORS AS PRIMARY MEANS OF CONTROLLING THE FINAL MATERIAL PROPERTIES. MORE ATTENTION SHOULD BE PAID TO THE CHEMICAL AND PHYSICAL CHANGES WHICH ARE OCCURRING IN-PROCESS. ADVANCED CONTROL SYSTEMS MUST MONITOR THESE CHANGES WITH APPROPRIATE SENSORS AND PROVIDE A MEANS VIA AN INTELLIGENT PROCESSOR OF ADJUSTING THE PROCESS TO OBTAIN LESS PRODUCT VARIABILITY AND DESIRED PROPERTIES. CARBONIZATION IS A KEY PROCESS STEP USED IN C/C MANUFACTURING. AN INHERENT FEATURE OF PITCH MATRIX PRECURSORS IS MESOPHASE FORMATION, WHICH IS A DISPERSED PHASED FORMED BY THE CHEMICAL REACTION OF SELECT COMPONENTS IN THE PITCH. MESOPHASE FORMATION AND COALESCENCE ARE ESSENTIAL TO THE FORMATION OF GRAPHITIC MATRIX MICROSTRUCTURE. THUS, IMPROVED CONTROL OF THIS STEP MAY LEAD TO INCREASED COMPOSITE PERFORMANCE AND DECREASED VARIABILITY. GAS EVOLUTION, DUE TO CHEMICAL REACTION, ALSO OCCURS DURING THE CARBONIZATION PROCESS. THUS, IN SITU GAS ANALYZERS COULD BE USED AS CARBONIZATION PROCESS SENSORS.

* Information listed above is at the time of submission. *

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