新型炭材料
新型炭材料
신형탄재료
NEW CARBON MATERIALS
2015年
3期
282-288
,共7页
曹瑞雄%陶则超%王宏宝%郭全贵
曹瑞雄%陶則超%王宏寶%郭全貴
조서웅%도칙초%왕굉보%곽전귀
电镀%熔盐%石墨%铝%结合性能%热导率
電鍍%鎔鹽%石墨%鋁%結閤性能%熱導率
전도%용염%석묵%려%결합성능%열도솔
Electrochemical deposition%Molten salt%Graphite%Aluminum%Adhesion stress%Thermal conductivity
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)。
採用AlCl3-NaCl-KCl混閤鎔鹽(質量比8:1:1)在石墨錶麵電鍍得到鋁金屬鍍層/石墨複閤材料。通過調節電流密度和電鍍時間可實現對鋁金屬鍍層厚度和錶麵形貌的控製。在相同電流密度(1.06 A/dm2)下,電鍍時間在240 min以內時,電鍍時間越長,鍍層越厚(最大厚度140μm),但電鍍時間達到300 min時,鋁金屬鍍層錶麵齣現枝狀結構;電流密度越大鋁金屬沉積速率越快,在相同電鍍時間(120 min)時,電流密度達到3.28 A/dm2,得到鋁鍍層最厚(148μm)。鋁金屬鍍層與石墨基體間的附著彊度較高,鋁金屬層可提高複閤材料的熱導率,熱導率從最初的115.7 W/(m·K)提高至199.0 W/(m·K)。
채용AlCl3-NaCl-KCl혼합용염(질량비8:1:1)재석묵표면전도득도려금속도층/석묵복합재료。통과조절전류밀도화전도시간가실현대려금속도층후도화표면형모적공제。재상동전류밀도(1.06 A/dm2)하,전도시간재240 min이내시,전도시간월장,도층월후(최대후도140μm),단전도시간체도300 min시,려금속도층표면출현지상결구;전류밀도월대려금속침적속솔월쾌,재상동전도시간(120 min)시,전류밀도체도3.28 A/dm2,득도려도층최후(148μm)。려금속도층여석묵기체간적부착강도교고,려금속층가제고복합재료적열도솔,열도솔종최초적115.7 W/(m·K)제고지199.0 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) .