The Manufacture Of Copper Powder Sintered Frame/phase Change Material Composite Module And Research Of Its Thermal Control Ability And Application

In recent years,electronic devices generally develop towards miniaturization and high power density direction,while the heat dissipation problem and the corresponding thermal control solution has become a bottleneck restricting the development of high-end electronic technology industry.Phase change materials(PCMs)has huge energy storage density and their temperature can keep almost constant during phase changing.These characteristics make them have an incredible potential of being applied in thermal management of large power electronic device and lithium battery,utilization of solar energy and optimization of energy system.However,the thermal conductivity of phase change material is extremely low,meanwhile,its state and volume will be changed after phase change,which limit its application range and effect under the condition of high heat flow density and large electronics volume.Almost all the current academic solution to above problem have some defects.Therefore,this article filled the paraffin into the copper powder sintered frame(CPSF)by vacuum infusion method,prepared a novel copper powder sintered frame/phase change material(CPSF/P)composite module/heat-sink,invenstigated and optimized its basic characteristic and temperature control ability.In this paper,the main works were as follows:(1)Developed a process to manufacture the CPSF/P composite module.Paraffin was chosen as phase change material and CPSF was prepared by sintering process.Then the paraffin was filled into the CPSF by vacuum infusion method to prepare the composite modules with different porosities and a stably filling rate > 83%.After that,the tensile properties,bending properties,thermal conductivities and latent heat performances of the composite modules were tested.The data show that the CPSF/P composite module has good comprehensive mechanical properties and excellent thermal performances.(2)Set up a visual temperature measuring system and studied the quasi one-dimensional phase change heat transfer performance of CPSF/P composite module.The differences of phase change heat transfer behaviors between CPSF/P composite module and pure paraffin were compared.Then the effects of different CPSF porosities and filling patterns to the temperature control ability and device critical duration time of above samples under quasi one-dimensional heat transfer condition were investigated.The results show that the CPSF/P composite module can keep the thermal resource in a lower temperature and a slower heating rate,additionally,the sample with higher porosity shows a better temperature control performance.(3)Designed a CPSF/P composite heat-sink for high-power LED,and set up a compre-hensive temperature control experiments measuring system.The effects of different LED powers,fan speeds,types of heat-sink,CPSF porosities and the multi-cycle operating conditions to the single-cycle stable temperature control ability and the multi-cycle transient temperature control ability of CPSF/P composite heat-sink were studied.The results demonstrate that the composite heat-sinks show far better thermal control ability than aluminum finned-heat-sink under all conditions,and the heat-sink-2 with a CPSF porosity of 68% process the most excellent performance,which significantly reduce the harmful effect of temperature shock and alternating thermal stress to electronic devices,effectively improve the stability and reliability of the high-power LED.