红外低发射率颜料制备及其可见光/红外特性研究  

Preparation and Visible & IR Light Properties of Low IR Emissivity Pigments

作　　者：吴护林[1,2] 朱敏[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640 [2]西南技术工程研究所,重庆400039

出　　处：《表面技术》2016年第6期147-152,共6页Surface Technology

摘　　要：目的制备Al/Cr2O3红外低发射率颜料,维持红外波段高反射的同时,降低可见光波段的反射特性,以满足可见光/红外兼容伪装材料的要求。方法采用液相沉积表面包覆技术对片状铝粉进行改性,制得Al/Cr2O3颜料粉体,对Al/Cr2O3颜料粉体的微观形貌、成分进行表征,并对添加Al/Cr2O3的涂层在可见光近红外波段的光谱反射率、在8~14μm波段的红外发射率、辐射温度及热像图进行表征与分析。结果 Cr2O3成功包覆于铝粉表面,且包覆基本完整。含Al/Cr2O3的涂层光谱反射曲线与背景绿色植被相似,可以较好地模拟自然背景中的绿色植物。涂层的红外发射率与低发射率功能填料Al/Cr2O3的含量密切相关,随Al/Cr2O3颜料含量增加,涂层的发射率由0.91降到0.43,平均辐射温度由27.9℃降低到22.7℃。结论制备的颜料应用于涂层后,可实现有效的红外热图像分割效果,能够满足可见光/红外兼容伪装材料对红外低发射率功能填料的要求。Objective Low infrared（IR） emissivity Al/Cr2O3 pigment was prepared from flake aluminum powder which was modified by surface coating technology. The pigment satisfied the requirement of compatibility and camouflage of visible and IR light through maintaining high reflective property in IR region and decreasing reflective property in visible region at the same time. Methods The composition and surface structure of Al/Cr2O3 powder were analyzed by SEM and EDS. The reflective property in visible and NIR region, IR emissivity between 8~14 μm, radiation temperature and IR thermal image were characterized by spectrophotometer, IR emissivity tester and IR thermal imager. Results Al powder was successfully and fully clad by Cr2O3. The reflective curve of Al/Cr2O3 coating was demonstrated similar to green plants in background, so Al/Cr2O3 coating could simulate natural background favorably. IR emissivity and thermal image test showed that the IR emissivity of the coatings had a close relationship to the content of Al/Cr2O3 pigments. As the content of Al/Cr2O3 increased, the IR emissivity of the coating decreased from 0.91 to 0.43 and the radiation temperature decreased from 27.9 ℃ to 22.7 ℃. Conclusion Effective IR image segmentation was achieved to satisfy the needs of compatible visible and IR camouflage materials.

关 键 词：改性铝粉 Al/Cr2O3颜料 红外发射率 光谱反射率 兼容伪装涂层 

分 类 号：TQ628[化学工程—精细化工]