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以溶胶凝胶法制备的高纯La_(1-x)Sr_xMnO_3(x=0.125,0.175,0.2)纳米粉末为填料,分别以热塑性丙烯酸树脂和松油醇@乙基纤维素为基料制备成涂层浆料,并涂覆于铝基底表面,再分别以低温120℃和180℃固化La_(1-x)Sr_xMnO_3热致变色涂层.实验表征了纳米粉末的物相,表面形貌,观察了涂层的微观形貌.并利用稳态卡计法测量了热致变色涂层在173~370 K温度范围内全半球发射率随温度的变化.研究结果表明:两种不同树脂为基料的涂层都表现出热致变色特性,其发射率增幅达0.45.由于低温固化涂层制备工艺简单,能够适用于复杂表面的涂覆应用,在航天热控中具有潜在的应用前景.
The high purity La 1-x Sr x MnO 3 (x = 0.125,0.175,0.2) nanopowder prepared by sol-gel method was used as filler to prepare the coating with thermoplastic acrylic resin and terpineol @ ethylcellulose Layer slurry was prepared and coated on the surface of aluminum substrate.The La_ (1-x) Sr_xMnO_3 thermochromic coating was cured at low temperature of 120 ℃ and 180 ℃ respectively.The phase and the surface morphology of the nano-powder were characterized and observed The microstructure of the coatings was characterized by means of steady-state calorimetry, and the changes of the emissivity of the whole hemisphere with temperature were measured in the range of 173 ~ 370 K. The results show that two different resins The coatings all exhibit the property of thermochromism with the increase of emissivity of 0.45. Due to the simple preparation process of the low temperature curing coating, it can be applied to the coating application of complex surface and has potential application prospects in aerospace thermal control.