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用溶胶凝胶法和喷雾干燥技术在云母微粉表面包覆了不同nW/nV的掺钨V2O5溶胶,分别采用热分解和碳热还原得到了掺钨VO2/云母复合粉体。通过XRD、SEM对复合粉体进行了物相组成、微观形貌的表征。将复合粉体添加到紫外光固化树脂中形成复合薄膜,通过FTIR测试了复合薄膜相变过程中的红外透过率图谱,并通过DSC测试了复合粉体的相变温度(Tt)。结果表明两种热处理方法均得到了VO2(M),VO2晶体以蠕虫状附着在云母表面,同时钨的掺入使云母表面的VO2颗粒更加细小。不同掺杂量的复合粉体均表现出较优异的热致变色性能,相变前后在2 200 cm-1波数处的红外透过率变化量(ΔTr)均超过20%。随着nW/nV增加,复合粉体的ΔTr逐渐减小,Tt逐步降低,同时相变陡然性减缓。
The mica doped with different nW / nV of tungsten-doped V2O5 sol was coated on the surface of mica by sol-gel method and spray-drying technique. The tungsten doped VO2 / mica composite powders were obtained by thermal decomposition and carbothermal reduction respectively. The phase composition and microstructure of the composite powders were characterized by XRD and SEM. The composite powder was added to the UV-curable resin to form a composite film. The infrared transmittance spectrum of the composite film was measured by FTIR. The phase transition temperature (Tt) of the composite powder was measured by DSC. The results showed that VO2 (M) was obtained by both heat treatment methods. The VO2 crystals adhered to the surface of the mica in a vermicular form, and the incorporation of tungsten made the VO2 particles on the mica surface finer. The composite powders with different doping amount all showed excellent thermochromism. The change of the infrared transmittance (ΔTr) at the wave number of 2 200 cm-1 before and after the transformation was more than 20%. With the increase of nW / nV, the ΔTr of the composite powder gradually decreases, the Tt decreases gradually, and the phase transition abruptly decreases.