A comparative study of two kinds of Y and Al modified silicide coatings on an Nb–Ti–Si based alloy prepared by pack cementation technique
A comparative study of two kinds of Y and Al modified silicide coatings on an Nb–Ti–Si based alloy prepared by pack cementation technique
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DOI：
10.1016/j.corsci.2011.08.040
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发表时间：
2011-12
影响因子：
8.3
通讯作者：
Ping Zhang;Xiping Guo
中科院分区：
文献类型：
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作者：
Ping Zhang;Xiping Guo
采用包埋共渗技术在Nb-Ti-Si基合金表面制备了两种Y和Al改性的硅化物涂层。研究了两种涂层的显微组织和氧化行为。两种涂层均具有多层结构，但外层分别由Y和Al掺杂的（Nb，X）Si 2或Y掺杂的（Nb，X）3Si 5Al 2+（Nb，X）Si 2相组成。在1250°C氧化100 h后，前者能保护基体合金不被氧化，而后者只能保护不到20 h。阐述了两种涂层氧化后的结垢机理和微观结构变化。
Two kinds of Y and Al modified silicide coatings on an Nb–Ti–Si based alloy were prepared by pack cementation technique. The microstructure and oxidation behavior of both coatings were studied. Both coatings had a multiple layer structure, but the outer layers were composed of either Y- and Al-doped (Nb,X)Si2or Y-doped (Nb,X)3Si5Al2+(Nb,X)Si2phases, respectively. The former coating could protect the substrate alloy from oxidation at 1250°C for 100h, but the latter coating could only endure for less than 20h. The scale formation mechanisms and microstructural changes of both coatings upon oxidation have been illustrated.