采用AlCl3-NaCl-KCl混合熔盐(质量比8：1：1)在石墨表面电镀得到铝金属镀层/石墨复合材料。通过调节电流密度和电镀时间可实现对铝金属镀层厚度和表面形貌的控制。在相同电流密度(1.06 A/dm2)下,电镀时间在240 min以内时,电镀时间越长,镀层越厚(最大厚度140μm),但电镀时间达到300 min时,铝金属镀层表面出现枝状结构；电流密度越大铝金属沉积速率越快,在相同电镀时间(120 min)时,电流密度达到3.28 A/dm2,得到铝镀层最厚(148μm)。铝金属镀层与石墨基体间的附着强度较高,铝金属层可提高复合材料的热导率,热导率从最初的115.7 W/(m·K)提高至199.0 W/(m·K)。
An electrochemical method was used to deposit aluminum on a graphite plate in a molten NaCl-KCl-AlCl3 mixture with a weight ratio of 1:1:8 to form a coatings with different thicknesses. The thickness and morphology of the coating were con-trolled by the current density and electrochemical deposition time. Results indicated that the thickness of the coating increased with deposition time up to 240 min at a current density of 1. 06 A/dm2 and a dendritic structure coating was formed by increasing the dep-osition time beyond 300 min. The greater the current density, the faster the deposition rate. When the current density was increased to 3. 28 A/dm2 , the thickness of the coating reached a maximum of 148μm for an electrochemical deposition time of 120 min. Ex-cellent adhesion strength between the aluminum coating and graphite substrate was proved by thermal shock resistance and scratch hardness tests. The thermal conductivity of the samples was increased significantly from an initial value of 115. 7 to 199. 0 W/(m· K) .
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