Mo2C intermediate layers for the wetting and infiltration of graphite foams by liquid copper
Mo2C intermediate layers for the wetting and infiltration of graphite foams by liquid copper
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DOI：
10.1016/j.carbon.2011.03.038
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发表时间：
2011-08
期刊：
影响因子：
10.9
通讯作者：
Jinliang Song;Q. Guo;X. Gao;Zechao Tao;Jingli Shi;Lang Liu
中科院分区：
文献类型：
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作者：
Jinliang Song;Q. Guo;X. Gao;Zechao Tao;Jingli Shi;Lang Liu
由于铜不会润湿石墨泡沫（GF），因此开发了一种在整个GF中合成Mo2C涂层的方法，以改善GF和铜之间的润湿性以及制备GF/铜复合材料。涂层是在由仲钼酸铵组成的反应介质中在玻璃纤维上形成的，仲钼酸铵在熔融的 NaCl-KCl 盐混合物中分解成细小的 MoO3。研究了GFs上Mo2C涂层的形成机制和微观结构。然后对所得GF/铜复合材料的微观结构、导热系数和热膨胀行为进行了研究。结果表明，Mo2C涂层的形成分两个步骤进行，即MoO3还原成MoO2和MoO2还原成Mo2C。在没有外压的情况下将铜渗透到Mo2C涂层的GF中，得到几乎无孔的GF/铜复合材料。密度为5.76 g/cm3的复合材料导热系数达到268.4 W/mK。与铜相比，复合材料的热膨胀系数显着降低（8.91 与 18.59 ppm/K）。
Since copper does not wet graphite foams (GFs), a method for the synthesis of Mo2C coatings throughout the GFs was developed for improving the wetting between GFs and copper and for the preparation of GF/copper composites. The coatings were formed on the GFs in a reaction medium consisting of ammonium paramolybdate, which decomposed to fine MoO3, in a mixture of molten NaCl–KCl salts. The formation mechanism and microstructure of the Mo2C coatings on GFs were investigated. Then the microstructure, thermal conductivity and thermal expansion behavior of the obtained GF/copper composites were studied. Results indicated the formation of Mo2C coatings occurred in two steps, namely, the reduction of MoO3to MoO2and the reduction of MoO2to Mo2C. Copper was infiltrated into the Mo2C-coated GFs without external pressure and the nearly pore-free GF/copper composites were obtained. The thermal conductivity of the composite with a density of 5.76 g/cm3reached 268.4 W/mK. Significant reduction in coefficient of thermal expansion of the composite compared with that of copper (8.91 versus 18.59 ppm/K) was obtained.