高温导热绝缘涂料

以环氧改性有机硅树脂为基体, 氮化硅、 氧化铝混合填料为导热粒子制备了导热绝缘涂料。研究了涂料力学性能、 热导率、 电绝缘性、 热稳定性等性能。结果表明: 在填料质量分数40％及较佳的氧化铝与氮化硅质量比时, 涂层拉伸强度为8.02MPa, 断裂延伸率为1.27％, 附着力达到572.2N · cm-2, 热导率高达1.25W · (m · K)-1, 介电常数5.7, 体、 表电阻率分别为3×1013Ω · cm与4.3×1013Ω, 可长期在200℃下使用。与不使用导热填料的环氧改性有机硅树脂涂层相比具有较高的传热能力。 

High temperature and insulating heat conductive coating

The thermal conductive coating was obtained with the epoxy modified silicone resin as matrix, and the mixture of silicone nitride and alumina as the heat conductive fillers. Its mechanical properties, thermal conductivity, electrical insulation and thermal stability were studied. The results indicate that at the total 40％ mass fraction of fillers and preferable mass ratio of alumina to silicone nitride, the tensile strength, elongation at break and adhesion of the coating are 8.02MPa, 1.27％ and 572.2N · cm-2, respectively; and its thermal conductivity, dielectric constant, volume resistivity and surface resistivity are 1.25 W · (m · K)-1, 5.7, 3×1013Ω · cm and 4.3×1013Ω, respectively. In addition, the coating can be used for a long term at about 200℃. The results also demonstrate that the coating has higher heat conduction compared with the unfilled epoxy modified silicone resin based coating.