Design, Manufacture And Application Enabling Technologies Of Advanced Composites With High Thermal Conductivity

The corrosion of materials can be found in almost all fields of the national economy, particularly in the industries such as chemical engineering, petroleum, mechanical engineering, metallurgy, textile, aerospace and national defence, and so on. Corrosion not only causes the enormous economic losses for the society, results in the disaster accidents and endangers personal safety, uses up the precious resources and energy, and pollutes the environment, but also obstructs the healthy development of the high technology. The advanced composite of high- thermal conductivity studied in this dissertation is a new kind of material with excellent corrosion resistance, good mechanical property and high thermal conductivity, which is expected to be used in the manufacturing of compact heat exchangers for caustic environmental applications.The main contents studied in this dissertation include: the preparation of polymer-matrix thermal conductive materials; the measurement of the thermal conductivity of polymer-matrix thermal conductive materials; the percolation thermal conductive model of polymer-matrix thermal conductive materials; the preparation of the high-thermal conductivity of advanced composites; and the design and fabrication of the plate-fin heat exchangers by using the advanced composites.The advanced composite of high-thermal conductivity uses polytetrafluoro- ethylene (PTFE) as matrix, and is prepared by a technology combination of thermal conduction enhancement and directional carbon fiber reinforcement. The developed material possesses the following merits: (1) an excellent corrosion resistance, comparable to that of PTFE; (2) good heat resistance, with the service temperature ranging from -100℃to 250℃; (3) high thermal conductivity and heat transfer efficiency, the thermal conductivity of the composites being about five times higher than that of PTFE, moreover no scaling on the material which helps to maintain high heat conductivity in service; (4) good comprehensive mechanical properties and service life, with a tensile strength of about 3-4 times higher than that of PTFE, and without cold-flow phenomenon that is inherent in PTFE; (5) good processing and molding ability, which allows welding, hot forming etc, and provides an economical and feasible technology for design and manufacturing of the corrosion resistant...