Preparation And Research Of Cu Nanoparticles/Paraffin Thermosensitive Composite Materials

The preparation of copper nanoparticles/paraffin thermosensitive composite materials is discussed firstly in the dissertation. The copper nanoparticles/paraffin composite powders are prepared by high energy milling. The morphology of powders is observed, with scanning electron microscopy (SEM) and transmission electron microscopy (TEM). X-ray diffraction (XRD) pattern is used to analyze the phase of the composite powders.The copper nanoparticles/paraffin thermosensitive composite materials are obtained by the compress moulding. The factors such as the forming technology, the milling time and the mass ration of copper and paraffin in the composite materials which affect the thermal sensitivity, the thermal expansion and the thermal stability of the composite materials are investigated.The research on the properties of the copper nanoparticles/paraffin thermosensitive composite materials reveals: the thermal sensitivity and the thermal expansion are "aried by the cempress moulding in heat condition with the change in density; the thermal sensitivity is varied by the mechanical milling with the change in particle shape and particle dimension; the mass ration of copper and paraffin in the composite materials also affects the thermal sensitivity , the thermal expansion and the thermal stability with the change in copper nanoparticles and paraffin interface.ANSYS finite element analysis software is applied for simulating the temperature field of the paraffin and the copper. The time needed of the cylindrical paraffin and the cylindrical copper reaching the thermal equilibrium is calculated respectively, and compared with the experimental data.