红外陶瓷涂层在满足高发射率设计要求的前提下,应尽量降低涂层厚度,以满足力学性能要求,节约原料,减轻器件重量.因此探索厚度与发射率之间的定量关系,是高发射率涂层研制中的一项重要内容.本文作者通过在水解法制备的氧化铝溶胶中加入高发射率填料,制备了高发射率涂料,并采用喷涂和旋涂工艺得到几种不同厚度的高发射复合陶瓷涂层.通过实验测试考察了复合陶瓷涂层的发射率随涂层厚度的变化规律,确定了复合涂层的临界厚度.在均匀涂层发射率与厚度关系模型的基础上,结合Maxwell-Garnett理论,建立了复合涂层发射率与厚度的理论关系模型.该模型对发射率的计算结果与实验值吻合较好,表明该模型可以用于实际复合涂层的发射率或临界厚度的预报.
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