作　　者： ; ; ; ;

机构地区： 广东工业大学材料与能源学院

出　　处： 《制冷学报》 2013年第1期84-88,共5页

摘　　要： 采用Ni-P-PTFE化学复合镀对铜管进行表面处理能有效减少污垢住换热表面上形成。然而，在实际应用上，复合镀层对铜管导热性能的影响是必须考虑的问题。实验利用热阻法对铜基Ni-P-PTFE复合镀层的导热系数进行测量，并利刖Wilson plot方法处理数据最终得到Ni-P-PTFE复合镀层的导热系数。分析了镀层各组分镍（Ni），聚四氟乙烯（PTFE），碳（C），磷（P）的质量分数对其导热性能的影响规律。 Copper tubes covered by Ni-P-PTFE composite coating can mitigate fouling adhesion on the heat exchange surface. However, the impact of composite coating on the thermal conduction of copper tubes should be considered. A thermal resistance method was utilized to measure the heat transfer coefficient of copper tubes with Ni-P-PTFE composite coatings. The thermal conductivities of these Ni-P-PTFE composite coatings were gained by means of Wilson plot in the end. The effects of Ni, PTFE, C and P contents were discussed on the thermal conductivity of Ni-P-PTFE composite coating. The results showed the thermal conductivity of these Ni-P-PTFE composite coatings were weakened by the increases of PTFE and P contents, but enhanced when the C content increased. It reached a peak value 23.12 W/（m.K） when w（PTFE）= 1.76%, w（C）=3.82% and w（P）= 10.81%, respectively. Although the thermal conductivities of the composite coatings were lower, their thermal resistances in the total heat transfer process were from 9.91×10^4 to 1.6× 10^-4（m2.K）/W due to their small thickness. Therefore, the tubes with Ni-P-PTFE composite coatings still kept high thermal conductivities 314.88-357.55W/（m-K）.

关 键 词： 导热性能 热阻测量法 化学复合镀层

领　　域： [一般工业技术] [一般工业技术]