HIGH TEMPERATURE PROPERTIESOF A STATE-CHANGE MATERIAL

摘要

A porous state-change material has been developed as part of a reconfigurable tooling system.rnThe primary form of this material consists of hollow glass microspheres suspended in a waterrnbased binder. The material is hardened by applying vacuum and elevated temperature to thernliquid slurry, leaving a thin binder layer between microspheres that holds them together.rnMechanical and thermal characterization data for this material has been previously reported forrnrelatively low temperature applications. There is interest in using this tooling system for thernfabrication of polymer composite structures that require processing temperatures in the range ofrn400 ℃ (750 ℉). The material must withstand the thermal-mechanical loading experiencedrnduring the fabrication process, including the thermal cycling. Compression and flexuralrnmechanical properties and coefficient of thermal expansion are determined at temperatures up torn400 ℃ (750 ℉). Room temperature properties of the material are also determined after thermalrncycling up to the same temperature.