304不锈钢复合电镀镍-膨胀石墨导热性能

Thermal Conductivity of Ni-expanded Graphite Composite Plating on Surface of 304 Stainless Steel

通过一种简单而经济的电镀方法在304不锈钢表面制备镍-膨胀石墨复合材料,并对其导热性能进行研究。通过扫描电子显微镜(SEM)、拉曼光谱(Raman)、X射线衍射(XRD)和能谱仪(EDS)对镀层的显微形貌及结构进行表征,通过激光粒度分布仪对膨胀石墨的粒径进行测定,通过激光导热仪测定复合镀层的导热系数。结果表明:膨胀石墨呈片状结构,缺陷少且复合镀前后缺陷基本不变。复合镀层中膨胀石墨的原子数分数为5.98%,且均匀分布。镍-膨胀石墨/304不锈钢的导热系数为16.02 W/(m·K),相比于镍/304不锈钢和304不锈钢,其导热系数分别提高了9.7%和23.8%。膨胀石墨与304不锈钢表面及镍镀层接触良好,构成了良好的导热通道,提高了镍镀层的导热性能。

Ni-expanded graphite composite was synthesized on the surface of 304 stainless steel （304 SS） through a simple and economical plating method and the thermal conductivity of Ni-expanded graphite composite was studied. The mi croscopic morphology and structure of the coatings were characterized by SEM, Raman, XRD and EDS. The particle size distribution of expanded graphite and the thermal conductivity of the coatings were characterized by laser particle size dis- tribution analyzer and thermal conductivity measurement, respectively. The results show that expanded graphite sheets have scarcely defects before or after plating and the expanded graphite content is 5. 98%. Ni-expanded graphite/304 SS with well dispersed expanded graphite exhibits a high thermal conductivity of 16.02 W/（m·K） at 298 K. Compared with the thermal conductivity of Ni/304 SS and 304 SS, the thermal conductivity of Ni-expanded graphite/304 SS is en hanced by 9.7% and 23.8%, respectively. Expanded graphite has good contact with Ni coatings and the surface of 304 SS, which constitutes paths of the heat conduction, and enhances the heat transfer performance of Ni coatings.