摘要： 以青铜粉为颜料，环氧改性有机硅树脂为粘合剂，采用喷涂法制备了环氧改性有机硅 / 青铜复合涂层。 研究了热处理温度及热处理时间对所制备涂层外观、微结构、红外发射率及力学性能的影响。 结果表明:环氧改性有机硅 / 青铜复合涂层最高可耐 300 °C 高温，在 300 °C 下热处理 5 h 后，涂层外观、微结构保持不变，红外发射率低至 0.228，力学性能保持完好，硬度、附着力和耐冲击性分别为4H、1 级和 50 cm。 所制备涂层在 250 °C 下可长时间使用，在 250 °C 下热处理 100 h 后，涂层外观、微结 构仍然保持不变，红外发射率可低至 0.227，力学性能保持完好，硬度、附着力和耐冲击性分别为 4H、1级和 50 cm。

关键词: 复合涂层, 环氧改性有机硅, 青铜粉, 红外发射率, 耐温性能

Abstract: Epoxy-modified silicone/bronze composite coatings were prepared by using bronze powders as pigments and epoxy-modified silicone as adhesives. The effects of heat treatment temperature and heat treatment time on the appearance, microstructure, infrared emissivity, and mechanical properties of the prepared coatings were systematically studied.The results indicated that the maximum withstand temperature of epoxy-modified silicone/bronze composite coatings gould reach 300 ℃. After the coatings were heat treated at 300 ℃ for 5 h, their appearance and microstructure remained unchanged. In addition, the infrared emissivity was as low as 0.228. The mechanical properties remained intact. The hardness, adhesion strength, and impact strength were maintained at 4H, 1 grade and 50 cm respectively.The prepared coatings could be used durably at 250 ℃. After the coatings were heat treated at 250 ℃ for 100 h, their appearance and microstructure of the coatings remained unchanged. In addition, the infrared emissivity was as low as 0.227. The mechanical properties remained in-tact. The hardness, adhesion strength, and impact strength were maintained at 4H, I grade and 50 cm respectively.

Key words: composite coatings, epoxy-modified silicone, bronze powders, infrared emissivity, heat resistance