以铝(Al)粉及青铜(Bronze)粉为复合颜料,聚氨酯(PU)为粘合剂,制备PU/A1Bronze复合涂层,研究了涂层的微结构和红外发射率.结果表明:PU/A1Bronze复合涂层具有类似一维光子结构特征,其发射率可低至0.186,且明显低于以单-金属颜料所制备的PU/Al及PU/Bronze涂层的发射率.其原因,一是复合涂层中由一维光子结构引起的反射光谱具有明显的多重反射峰;二是相比以高密度金属颜料制备的PU/Bronze涂层,PU/AlBronze涂层的表层树脂层的厚度明显降低,从而使其对涂层发射率的增量明显降低.
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