一体化陶瓷平板热管的自由成型与传热性能研究

Research on Freeform Fabrication and Heat Transfer Performance of Integrated Ceramic Flat Heat Pipes

为提高电子器件的散热效率,利用电机助推微注射器MAM(Motor Assisted Microsyringe)自由成型技术制备了带有矩形微槽的一体化Al2O3陶瓷平板微热管,并对其不同充液率、冷却条件下的传热性能进行测试。结果表明,在热流密度为5.3W/cm2条件下,陶瓷平板热管的传热性能良好。其中,稳态工作条件下,充液率为100%的热管蒸发端和冷凝端的温差仅有5.5℃,传热性能最好。与一般的平板热管相比,平板蒸汽腔工作时,最高温和温差均有所降低。

To improve the cooling efficiency of electronic device, integrated ceramic flat heat pipes in alumina with rectangular micro groove were constructed by MAM （ Motor Assisted Microsyringe） free form technology. The heat transfer performance tests were taken on the condition of different liquid charging ratios and cooling conditions. The results showed that when heat flux was 5.3 W/cm2, the heat pipe performed well. The best liquid charging ratio was 10%, and the temperature difference between evaporation zone and condensation zone was 5.5 ℃. Compared with common flat heat pipes, the highest temperature and temperature difference of flat vapor chamber were decreased. The bonding conditions had great impact on heat transfer performance.