本文選題：共摻雜　切入點：電導率　出處：《南京航空航天大學》2017年碩士論文

【摘要】：現(xiàn)階段對于耐高溫低發(fā)射率涂層的應用,主要是針對于發(fā)動機及相關熱端部件,可有效的降低其表面的紅外輻射,起到保護作用。前一階段課題組相關研究中,主要是以氧化鈰基的耐高溫低發(fā)射率涂層為主,其中,涂層單一的發(fā)射率或者抗熱震性能都比較良好,但不能同時滿足低紅外發(fā)射率及高抗熱震性能。為此,本文將以多層涂層結構模式來實現(xiàn)低發(fā)射率和高抗熱震的兼容,從而提高涂層的綜合性能,同時,研究并優(yōu)化了涂層制備工藝參數,探究了提高涂層的發(fā)射率及抗熱震性能等的相關方法。研究成果如下:1.利用共沉淀法,以Y~(3+)及Ca~(2+)共摻雜CeO_2可以明顯降低其紅外發(fā)射率,當Y~(3+)的摻雜量為15%且Ca~(2+)的摻雜量為5%時的粉體Ce_(0.8)Y_(0.15)Ca_(0.05)O_2-δ的發(fā)射率值最小為0.241,主要通過摻雜Y~(3+)及Ca~(2+)后提高其電導率從而降低其發(fā)射率。同時,利用輻照劑量為50KGy的60Coγ射線輻照處理粉體Ce_(0.8)Y_(0.15)Ca_(0.05)O_2-δ,其發(fā)射率在測試溫度700°C時達到最低為0.147。以上述化學及物理改性后的粉體作為填料制備表層涂層,其發(fā)射率在600°C時到最低為0.282。2.通過La~(3+)及Mg~(2+)共摻雜CeO_2可以提高其熱膨脹系數,以摻雜后的粉體為填料制備涂層即減少結合層與基板間的熱膨脹系數差,從而提高了涂層的抗熱震性能。3.通過正交實驗研究了涂層噴涂的工藝參數最優(yōu)配合方案,優(yōu)化工藝參數涂料粘度、噴涂氣壓及噴槍傾斜角,從而減少涂層制備工藝對涂層性能的影響。4.按照設計的表層、結合層及過渡層的多層結構制備了CYC/CLM基多層涂層,測試了其綜合性能,最低發(fā)射率值為0.284,抗熱震達51次,并且其耐熱及抗高溫氧化等性能良好。
[Abstract]:At this stage for high temperature resistance and low emissivity coating applications, mainly for the engine and related hot end components, can reduce the infrared radiation of the surface effectively, play a protective role. Previous studies research group, is mainly based on ceria based high temperature resistance and low emissivity coating, wherein the emissivity of coating single or thermal shock performance is relatively good, but can not meet the low infrared emissivity and high thermal shock resistance. Therefore, this paper will take the multi-layer coating structure model to achieve low emissivity and high thermal shock compatibility, so as to improve the overall performance, high coating at the same time, research and optimization of the coating the preparation process parameters, to explore the related methods to improve the emissivity of the coating and thermal shock resistance. The research results are as follows: 1. using co precipitation method with Y~ (3+) and Ca~ (2+) Co doped CeO_2 can significantly reduce the infrared emissivity, when Y~ ( 3+)鐨勬幒鏉傞噺涓，

本文編號：1703873