以青铜粉、Sm2O3为颜料,环氧改性有机硅为粘合剂,采用喷涂法制备了青铜-Sm2O3/环氧改性有机硅复合涂层.系统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、近红外反射率、红外发射率及力学性能的影响.结果表明:青铜-Sm2O3/环氧改性有机硅复合涂层最高可耐受温度可达到300℃,在300℃下热处理5 h后,涂层外观、微结构基本保持不变,发射率和1.06 μm近红外反射率可分别低至0.590和57.4%,力学性能保持完好,硬度、附着力和耐冲击强度可分别保持在4 H、1级和50 kg·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,发射率和1.06 μm近红外反射率可分别低至0.558和59.3%,力学性能保持完好,硬度、附着力和耐冲击强度可分别保持在4 H、1级和50 kg·cm.
Bronze-Sm2O3/epoxy-modified silicone composite coatings were prepared through spraying method by using epoxy modified silicone and bronze & Sm2O3 as adhesives and pigments, respectively.The effect of heat treatment temperature and heat treatment time on the appearance, microstructure, near-infrared reflectivity, infrared emissivity, and mechanical properties of the as-prepared coatings were systematical investigated.The results indicate that the maximum withstand temperature of bronze-Sm2O3/epoxy modified silicone composite coatings can reach 300℃.After heat treatment at 300℃ with 5 h, the appearance and microstructure of the coatings are almost the same.The emissivity and near-infrared reflectivity at 1.06 μm can be as low as 0.590 and 57.4%, respectively.The mechanical properties remain intact.The hardness, adhesion strength, and impact strength can be maintained at 4 H, 1 grade, and 50 kg·cm, respectively.The prepared coatings can be used long-term at 250℃.After heat treatment at 250℃ with 100 h, the appearance and microstructure of the coatings remain unchanged.The emissivity and near-infrared reflectivity at 1.06 μm can be as low as 0.558 and 59.3%, respectively.The mechanical properties remain intact.The hardness, adhesion strength, and impact strength can be maintained at 4 H, 1 grade, and 50 kg·cm, respectively.
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