Accession Number : ADA294945

Title :   Development of a Variable Frequency Microwave Processing System for Post-Curing of Thermoset Polymer Matrix Composite Materials.

Descriptive Note : Final rept. 1 Sep 94-28 Feb 95,

Corporate Author : LAMBDA TECHNOLOGIES ACQUISITION CORP RALEIGH NC

Personal Author(s) : Johnson, Arvid

PDF Url : ADA294945

Report Date : 28 FEB 1995

Pagination or Media Count : 14

Abstract : Using a Variable frequency Microwave Furnace (VFMF) technology, Lambda Technologies has demonstrated the ability to tune to the optimum incident frequency for best coupling into a given material structure (e.g., polymer matrix composite, PMC), and then by sweeping around that incident center frequency, producing uniform energy distribution throughout the cavity and sample volume. Hence, the advantages of microwave energy---enhanced reaction rates, reduced process time, and heat generation at the molecular level---are now obtainable with controlled and uniform results compatible for commercial scale-up. The processing via VFMF is 8 - 10 times faster than conventional processing methods. The advantages of VFMF technology over single frequency microwave technology in achieving the uniform electromagnetic energy distribution required for rapid and reliable processing of advanced polymer composites are systematically demonstrated in the Phase I (Both Glass and Carbon fiber reinforced PMC were investigated). In addition, a numerical modeling program implemented during Phase I provided a foundation for the ability to predict field distribution and temperature profiles in various geometries (plate, disk and cylinder) and materials (glass and graphite fiber reinforced PMCs) when being heated with variable frequency microwave energy. (MM)

Descriptors :   *POLYMERS, *COMPOSITE MATERIALS, *MICROWAVES, FIBER REINFORCED COMPOSITES, CARBON FIBERS, MATRIX MATERIALS, MICROWAVE EQUIPMENT, CAVITIES, GLASS, HEATING, EPOXY COMPOSITES, FURNACES, THERMOSETTING PLASTICS.

Subject Categories : Laminates and Composite Materials
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE