Cu基热管芯体多孔材料增孔补强的研究

Research on increasing porosity and strengthening matrix of copper wick used for heat pipe

对不同粒径Cu粉、不同造孔剂(CuCl2.2H2O、NaCl)及其含量的Cu基热管芯进行了对比试验,分别对其开孔隙度、渗透系数、压缩性能进行了测试;并用扫描电镜(SEM)观测芯体的孔洞特征及烧结颈的形成情况,进一步探讨了烧结强化机理。结果表明:球形Cu粉粒径越大,Cu基热管芯的孔隙度和渗透系数较大,但强度越低;添加造孔剂CuCl2.2H2O有造孔和强化基体的双重作用;添加NaCl增加孔洞效果明显,但仅有造孔作用。

A contrast test of sintered wicks with different particle size of Cu powder and different pore-forming material （CuCl2·2H2O、NaCl） and content was conducted. The porosity, permeability and compressibility were measured. The pore morphology and sintering neck were characterized with field emission scanning electron microscope （FESEM） , the mechanism of sintering aggrandizement in hydrogen reduction atmosphere were discussed. Experimental results show that the porosity, maximum pore size and permeability of sintered wicks are increased, but the strength and plasticity of the wicks are decreased with increasing particle size of spherical powder. Addition of CuCl2·2H2O、NaCl play a role in pore-forming and strengthening the matrix,but addition of NaCl has pore-forming effect only.