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热管是一种高效的电子设备传热元件。与纯金属相比,热管具有非常好的传热性能,而其吸液芯结构是决定其传热性能的关键。为了在增大吸液芯孔隙率的同时不引入杂质并且不破坏吸液芯结构,以草酸铜作为造孔剂,研究草酸铜的添加量对不同形状铜粉烧结过程中吸液芯的孔隙率与渗透率的影响,以及添加量与微热管的最大传热功率和温差的关系。实验结果表明:随着草酸铜含量的增加,吸液芯孔隙率增大,其最大传热功率及温差也变大;当添加草酸铜的含量相同时,不规则铜粉烧结热管的最大传热功率高于球形铜粉烧结热管,但其均温性与球形铜粉烧结热管相比较差;通过优化工质含量,得到了充液率与最大传热功率及温差的关系;当充液率在80%时,既能达到热管最大传热功率,温差也较低,是最佳的充液状态。
Heat pipe is a highly efficient electronic device heat transfer components. Compared with pure metals, heat pipe has very good heat transfer performance, and its wick structure is the key to determine the heat transfer performance. In order to increase the porosity of the wick without inducing impurities and without damaging the structure of the wick, copper oxalate was used as the pore-forming agent to study the effect of the addition amount of oxalate on the wicking of the wick in the different shapes of copper powder And permeability, as well as the amount of heat transfer with the maximum heat transfer tube and the relationship between temperature. The experimental results show that with the increase of copper oxalate content, the porosity of wick increases and the maximum heat transfer power and temperature difference become larger. When the content of oxalate is the same, the maximum heat transfer of irregular copper powder heat pipe The power is higher than the spherical copper powder sintered heat pipe, but the average temperature is worse than the spherical copper powder sintered heat pipe. By optimizing the working fluid content, the relationship between the liquid filling rate and the maximum heat transfer power and temperature difference is obtained. 80%, both to achieve the maximum heat pipe heat transfer power, temperature is also lower, is the best filling state.