Preparation and structural formation of oxidation-resistant silicide coatings on Nb-based alloy by pack cementation technique
Preparation and structural formation of oxidation-resistant silicide coatings on Nb-based alloy by pack cementation technique
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发表时间：
2007
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通讯作者：
Jiang Yuan-yuan
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作者：
Jiang Yuan-yuan
采用包埋渗技术在Nb基合金上制备了抗氧化硅化物涂层，保温温度分别为1 050、1 150和1 250 ℃，保温时间分别为2、5、10、15和20 h，利用扫描电子显微镜（SEM）分析了涂层的结构、相组成和成分分布，结果表明，涂层的相组成为（Nb，X）Si2（X代表Ti、Cr、Hf和Al元素），涂层中存在双层结构，上层较致密，涂层与基体之间形成过渡层和扩散区。1150 ℃和1250 ℃均符合抛物线规律。
Oxidation-resistant silicide coatings on an Nb-based alloy were prepared by pack cementation technique.The holding temperatures were 1 050,1 150 and 1 250 ℃ and the holding time were 2,5,10,15 and 20 h,respectively.The structure,phase constituents and compositional distribution in the coatings were analyzed by SEM,EDS and XRD techniques.The formation mechanism and growth kinetics of the coatings were discussed and measured.The results show that the phase constituent of the coatings is(Nb,X)Si2(X represents Ti,Cr,Hf and Al elements).Double layers exist in the coatings,and the upper layer is denser.A transitional layer and a diffusion zone form between the coating and base material.The coating growth kinetics at 1 050,1 150 and 1 250 ℃ were all fitted well to parabolic laws.