Cyclic oxidation of an ultrafine-grained and CeO2-dispersed δ-Ni2Al3 coating

Cyclic oxidation of an ultrafine-grained and CeO2-dispersed δ-Ni2Al3 coating
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超细晶粒和 CeO2 分散的 δ-Ni2Al3 涂层的循环氧化

DOI:
10.1016/j.corsci.2009.10.034
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发表时间:
2010-03
期刊:
影响因子:
8.3
通讯作者:
Peng X
Peng X
中科院分区:
材料科学1区
文献类型:
--
作者:
Xu C;Wang F;Peng X

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采用nh4cl活化包埋法,在600℃下对ceo2纳米颗粒分散的纳米晶Ni基膜进行渗铝处理,制备了一种新型超细晶ceo2分散的δ- ni2al3涂层。制备了粗晶和超细晶两种无ceo2 δ- ni2al3涂层。与后者相比,超细晶和ceo2分散涂层在1000℃空气循环氧化过程中显著提高了抗剥落能力。分散的CeO2和超细晶涂层结构有助于防止在水垢/涂层界面形成空腔,这是提高循环抗氧化性能的主要原因。
A novel ultrafine-grained and CeO2-dispersed δ-Ni2Al3coating was fabricated through aluminizing a CeO2-nanoparticle-dispersed nanocrystalline Ni matrix film using an NH4Cl-activated pack cementation method at 600°C. Two CeO2-free δ-Ni2Al3coatings, one coarse-grained and the other ultrafine-grained, were also prepared. Compared with the later, the ultrafine-grained and CeO2-dispersed coating profoundly increased scale spalling resistance during cyclic oxidation in air at 1000°C. The dispersed CeO2, together with the ultrafine-grained coating structure, helped prevent the formation of cavities at the scale/coating interface, which was proposed as a main cause for improvement of the cyclic oxidation resistance.
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