新型细晶Ni_3Al涂层的高温氧化行为
HIGH TEMPERATURE OXIDATION BEHAVIOR OF A NOVEL FINE-GRAINED Ni3Al COATING
查看参考文献16篇
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文摘
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采用Ni和Al颗粒复合电沉积与后续真空退火的方法，分别于600℃和800℃退火温度下制备了两种新型细晶Ni3Al涂层。与粗晶合金相比，经1000℃氧化20h后，合金的氧化层发生大面积剥落，而两种涂层的氧化膜粘附性佳，其主要原因为细晶涂层内的大量晶界促进Al向氧化前沿的扩散，从而抑制了氧化膜/基体界面处“Kirkendall”孔洞的形成与长大。同时发现，800℃退火涂层氧化膜结构由外至内分别为NiO/NiAl204/Al203，而600℃退火涂层仅生成NiAl_2O_4与Al_2O_3，对该原因进行了探讨。 |
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其他语种文摘
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Fine-grained γ'-Ni_3Al coatings were developed by a two-step process: co-electrodeposition of Ni with Al particles and subsequent annealing in vacuum at 600 ℃ or 800℃. After oxidation at 1000℃ in air for 20 h, the scales formed on both coatings exhibited better adhesion than that on a coarse-grained Ni_3Al alloy, because the fine-grained coating structure suppressed the formation of voids at the scale/metal interface. Moreover, the scale formed on the coating by annealing at 800℃ consisted of NiO, NiAl_2O_4 and Al_2O_3, while the scale on the coating by annealing at 600℃ consisted of NiAl_2O_4 and Al_2O_3. The reason for this result is related to that the latter coating had a finer-grained structure, which promoted rapid formation of a continuum layer of Al_2O_3. |
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来源
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中国腐蚀与防护学报
,2011,31(6):414-418 【核心库】
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关键词
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氧化
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细晶
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复合电沉积
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退火
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孔洞
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地址
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1.
哈尔滨工程大学材料科学与化学工程学院, 金属腐蚀与防护国家重点实验室, 哈尔滨, 150001
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中国科学院金属研究所, 金属腐蚀与防护国家重点实验室, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-4537 |
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学科
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金属学与金属工艺 |
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文献收藏号
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CSCD:4414423
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16
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