环氧改性有机硅/Al-Sm_2O_3复合涂层的耐温性能

以Al粉、Sm_2O_3为颜料,环氧改性有机硅为黏合剂,采用喷涂法制备了环氧改性有机硅/Al-Sm_2O_3复合涂层。研究了不同耐热温度及耐热时间对涂层外观、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:所制备涂层在300℃下热处理5 h后,其外观、微结构保持不变;发射率和1.06μm近红外反射率可分别低至0.607和64.7%;涂层的硬度、附着力和耐冲击强度等力学性能可分别保持在4 H、1级和50 kg·cm;所制备涂层在250℃下热处理100 h后,其外观、微结构仍然保持不变;发射率和1.06μm近红外反射率可分别低至0.624和67.1%;涂层的硬度、附着力和耐冲击强度等力学性能可分别保持在4 H、1级和50 kg·cm。

Heat Resistance of Epoxy-modified Silicone/Al-Sm2O3 Composite Coatings

Epoxy-modified silicone/Al-Sm2O3 composite coatings with epoxy-modified silicone and Al & Sm2O3 as adhesives and pigments were prepared through spraying method.The effect of heat treatment temperature and heat treatment time on the appearance,microstructure,near-infrared reflectivity,infrared emissivity and mechanical properties of the coating were systematically investigated.The results indicate that after heat treatment at 300 ℃ with 5 h,the appearance and microstructure of the coatings remain unchanged,and the emissivity and near-infrared reflectivity at 1.06 μm are as low as 0.607 and 64.7% respectively;hardness,adhesion strength,and impact strength are maintained at 4 H,1 grade and 50 kg·cm respectively.After heat treatment at 250 ℃ with 100 h,the appearance and microstructure of the coatings remain unchanged,and the emissivity and near-infrared reflectivity at 1.06 μm are as low as 0.624 and 67.1% respectively;hardness,adhesion strength and impact strength are maintained at 4 H,1 grade and 50 kg·cm respectively.