Because current high temperature (650°C), metallic heat exchangers are heavy and typically made from metals possessing a low thermal conductivity, alternative high temperature materials are being investigated. An effort has been underway to develop a high temperature, carbon-carbon composite, aircraft heat exchanger. The heat exchanger core is a plate fin design and fabricated from a carbon-carbon composite and called an integral core process. This process involves co-processing the conductive fins and structural plates and then brazing together the plates of these structures. The effort to be discussed determined how to braze the carbon-carbon structures together to provide the required structural and thermal joint.
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