Due to the poor thermal dissipation performance of bus bars in the static air environment， using nickel cadmium spinel phase as radiation filler， carbon nanotubes （CNTs） as thermal conductive filler to prepare thermal dissipation coatings for bus bars. The influence of filler content on coatings emissivity and thermal conductivity was researched， and the microstructure and adhesive of coatings， heat dissipation performance and the influence of coating thickness on the heat dissipation were characterized. Results showed that the emissivity of coatings increased with the increase of the radiation fillers content， and slightly decreased with the increase of the temperature. The emissivity of coating was basically stable at 093 when the content of nickel cadmium spinel reached 16 wt.％. On this basis， a continuous network of thermal conductivity in the coatings was formed with adding 4 wt.％ CNTs. The thermal conductivity of coating was 1.96 W／（mK）， the adhesion of coating on the bus bar was 5～8 MPa. The temperature rise of the aluminum bus bar with applying thermal dissipation coating was 30.3 K lower than that of the bare bus bar， and 6.3 K lower than that of the aluminum bus bar coated with pure resin coating. The temperature rise of the copper bus bar with applying thermal dissipation coating was 22.5 K lower than that of the bare bus bar， and 5.8 K lower than that of the copper bus bar coated with pure resin coating. The thermal dissipating performance improved significantly. The thickness had no effect on bus bar thermal dissipation when coating thickness was less than 200 μm.
MENG Xiao-Ming
. Preparation and performance study of thermal dissipation coatings for bus bars[J]. Paint & Coatings Industry, 2019
, 49(2)
: 71
-77
.
DOI: 10.12020/j.issn.0253-4312.2019.2.71
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