耐温型低红外发射率复合涂层的制备及性能表征

Preparation and Property Characterization of Heat-Resistant Composite Coatings with Low Infrared Emissivity

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℃高温,在300℃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℃下可长时间使用,在250℃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。

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 em- issivity, 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 could 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 intact. The hardness, adhesion strength, and impact strength were maintained at 4H, 1 grade and 50 cm respectively.