Formation of Ni-aluminide Coating Containing Hf by Molten-Salt Electrodeposition and Cyclic-Oxidation Resistance
Formation of Ni-aluminide Coating Containing Hf by Molten-Salt Electrodeposition and Cyclic-Oxidation Resistance
复制标题
熔盐电沉积含Hf镍铝化物镀层的形成及其抗循环氧化性能
DOI：
10.1007/s11085-008-9122-1
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发表时间：
2008
影响因子：
2.2
通讯作者：
T. Narita
中科院分区：
文献类型：
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作者：
M. Hara;Y. Matsuda;M. Fukumoto;T. Narita
通过电沉积 Hf、Ni 和 Al，尝试在 Ni-10at.%Cr-8at.%Al 合金基体上形成含 Hf 的镍铝化物涂层。然后在 1,423 K 的空气中评估覆盖有该涂层的合金的抗循环氧化性。通过水溶液电解沉积镍。通过熔盐电解沉积 Hf 和 Al。对于首先用Hf沉积处理、随后用Ni沉积处理、然后再沉积Al处理的样品，在合金上均匀地形成了由Ni 2 Al 3 组成的厚度约40μm的涂层。在该涂层的中心区域形成Hf浓化层。循环氧化测试表明，对于未处理的样品和仅具有Ni和Al沉积的样品，在初始氧化期间发生了由于氧化皮剥落而导致的质量减少。相反，对于沉积有Hf、Ni和Al的样品，几乎没有发生由于氧化皮剥落而导致的质量减少。利用SEM的截面观察表明，对于氧化试验后沉积有Hf、Ni和Al的样品，形成了具有尖刺形状的粘附氧化皮。该氧化皮主要成分为α-Al2O3，并含有HfO2颗粒。推测在该样品中，Hf浓化层中的Hf扩散至Ni铝化物层的表面区域，有助于氧化皮的耐剥离性的提高。
The formation of a coating layer consisting of Ni-aluminide containing Hf on a Ni–10at.%Cr–8at.%Al alloy substrate was attempted by the electrodeposition of Hf, Ni, and Al. The cyclic-oxidation resistance for the alloy covered with this coating was then evaluated in air at 1,423 K. Ni was deposited by aqueous solution electrolysis. Hf and Al were deposited by molten-salt electrolysis. For the sample first treated with the Hf-deposition, subsequently treated with the Ni-deposition, followed by Al-deposition, a coating consisting of Ni2Al3of about 40-μm thickness was uniformly formed on the alloy. At the center region of this coating, a Hf-concentration layer was formed. The cyclic-oxidation test showed that, for the untreated sample and the sample with only Ni and Al depositions, a mass reduction due to spallation of a scale took place during the initial oxidation period. On the contrary, for the sample with Hf, Ni, and Al depositions, a mass reduction due to spallation of a scale scarcely took place. The cross-sectional observation using SEM showed that, for the sample with Hf, Ni, and Al depositions after the oxidation test, an adhesive scale having a spiked shape was formed. This scale mainly consisted of α-Al2O3, and contained HfO2particles. It was postulated that, for this sample, the Hf in the Hf-concentration layer diffused into the surface region of the Ni-aluminide layer, contributing to improvement in the exfoliation resistance of the scale.
熔盐电沉积La提高不锈钢的抗氧化性能
DOI：
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发表时间：
2004
期刊：
Oxidation of Metals Vol.62, No.5/6
影响因子：
--
作者：
Michihisa Fukumoto;Rie Yamashita;Motoi Hara
通讯作者：
Motoi Hara
熔盐电沉积铝处理对TiAl高温氧化的影响
DOI：
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发表时间：
2004
期刊：
Oxidation of Metals Vol.61, No.1/2
影响因子：
--
作者：
Michihisa Fukumoto;Motoi Hara;Toshiro Nagataki
通讯作者：
Toshiro Nagataki