A Water Vapor Trap for Measuring Cumulative Humidity Exposure Navy SBIR FY2011.2 Sol No.: Navy SBIR FY2011.2 Topic No.: N112-087 Topic Title: A Water Vapor Trap for Measuring Cumulative Humidity Exposure Proposal No.: N112-087-0705 Firm: Creare Inc. P.O. Box 71 Hanover, New Hampshire 03755 Contact: Michael Jaeger Phone: (603) 643-3800 Web Site: www.creare.com Abstract: The advanced properties achieved by modern ceramic matrix composite (CMC) structures depend critically on the surface condition of reinforcement materials used in the manufacturing process. Contamination of reinforcement surfaces can result in brittle phases, low melting point eutectics, or foreign compounds at the critical interface between the reinforcement material and the ceramic matrix, which can compromise the composite's strength and/or chemical resistance. Such effects have been attributed to cumulative water vapor contamination of silicon carbide (SiC) fiber reinforcement fabrics used in SiC/SiC CMCs, such as those used in modern high temperature aircraft propulsion systems. Creare proposes to develop a passive sensor of cumulative humidity exposure to assist manufacturers with monitoring water vapor contamination of CMC reinforcement materials. The low-cost sensors will travel with individual ceramic fiber fabric rolls or containers of humidity sensitive material during shipping, storage, and handling, and can be read nondestructively by a handheld sensor reader whenever the humidity exposure history needs to be checked. In this Phase I project, Creare will develop prototype sensor components and demonstrate their basic functionality for measuring cumulative humidity exposure. In a future Phase II program, we will finalize the sensor designs, fabricate prototype sensors, and demonstrate them in laboratory experiments. Benefits: The proposed cumulative humidity sensors will enable monitoring of individual batches of humidity sensitive materials prior to manufacturing them into final products. The sensors will thus save time and money by preventing further manufacturing or storage of humidity compromised materials. The technology will directly benefit manufacturers and users of ceramic matrix composites, chemicals, pharmaceutical drugs, and various food products. Return