Study On Manufacturing And Capability Of Microgroove And Fibre Composite Wick Heat Column

With the rapid development of microelectronics technology,heat dissipation of high heatflux components becomes a key technology in designing electronic devices．Heat column isshort and thick, it has rapid heat transfer rate,great heat capacity and good adaptability, it canmeet heat dissipation and space requirements of high performance CPU,but how to tomanufacture composite heat column has been a critical technique.A high-performance groovefiber composite heat column is presented in this paper,its manufacturing process isresearched and explored detailedly, the composite heat column is fabricated and itsperformace is tested,the experiment result indicates the heat column has fast thermal responseand excellent heat transfer performance．According to high-performance computers CPU,the designing objectives of heat columnare proposed. the structure of heat column is designed basing on its design goals and workprincple, it consists evaporator, condenser, fiber sintered layer,working fluid,pumping tubeand cover composition. Its thermal resistance model, capillary limit, entrainment limit andboiling limit model are established．The micro-grooves of heat column'evaporator and condenser are machined usingploughing-extrusion method, the micro-grooves processed have enhanced boiling andenhanced condensation performance． Experiment analyzes the influence of differentprocessing parameters on micro-groove surface morphology．The better enhancement boilingstructure forms at P-E depth of0.3mm, ringed groove spacing of0.4mm, and the interiorangle of radial groove of3°; the better enhancement condensation structure forms at P-Edepth of0.3mm, ringed groove spacing of0.4mm, and axial grooves spacing of π/180．The finite element models of evaporator and condenser for heat column are established,the micro-groove forming process of evaporator and condenser for heat column is simulatedusing finite element software Deform6.0,the influence of processing parameters on themorphology of microgrooves and the stress strain are analyzed．The manufacturing technics of composite wick for heat column are analysed detailedly,sintering shaping principle of fibre sintering in composite wick is explored,the influence ofall the the sintering parameters and fiber diameter on the sintering properties of fibers sinteredlayer in composite wick,tensile and compression properties of composite wick are tested, and reseatched how different sintering paramters influence the mechanical properties ofcomposite wick．Finally the working fluid are infused to heat column,and its vacuum packaging andencapsulating are investigated．The test platform of thermal response property for heatcolumn is built to test thermal response performance; The test platform of heat transfer forheat column is built to test heat transfer performance,maximum heat transfer capacity is140W．...