以锌粉为导热填充剂对环氧有机硅树脂进行改性，考察了改性环氧有机硅树脂涂层干膜中锌粉含量对涂层导热系数的影响，分析了涂层厚度对碳钢基材导热性能的影响. 结果表明，环氧有机硅树脂涂层的导热系数约为0.19 W/(m?K)，其耐温能力在200℃以上，可保证涂层在中低温烟气余热回收换热器表层长期工作而不发生任何热反应；添加锌粉可改善环氧改性有机硅涂层的导热性能，涂层干膜锌粉25wt%时，涂层材料导热系数达0.35 W/(m?K)，较未添加锌粉时增大了84%. 复合材料的导热系数随涂层厚度增加而下降，无涂层的碳钢导热系数为47.59 W/(m?K)，涂层厚度为200 ?m时，导热系数降至34.33 W/(m?K).
The epoxy silicone resin was modified using zinc powder as heat conducting filler. Effect of zinc powder mass fraction on the thermal conductivity of modified epoxy organosilicon dry film coating was researched and the effect of coating thickness on the thermal conductivity of carbon steel was analyzed. The results showed that The thermal conductivity of silicone coating is around 0.19 W/(m?K), and heat-resistant temperature is above 200℃. Thus, the coating can ensure the long-term coating work in the low temperature flue gas waste heat recovery heat exchanger surface without any thermal reaction. Addition of zinc powder can improve the thermal conductivity of modified epoxy organosilicon coating. As the zinc powder content is 25wt%, the thermal conductivity of the coating material can increase 84% to 0.35 W/(m?K). Generally, with the increase of coating thickness, the thermal conductivity of metal matrix composite silicone coating decreases. The thermal conductivity of uncoated carbon steel was 47.59 W/(m?K), and the thermal conductivity of the coated carbon steel decreased to 34.33 W/(m?K) when the coating thickness was 200 μm.
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