Formation of Ni Aluminide Containing Hf by Simultaneous Electrodeposition of Al and Hf and Cyclic-Oxidation Resistance
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概要
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A Ni aluminide layer containing Hf was formed on a Ni specimen by the simultaneous electrodeposition of Al and Hf using a molten-salt bath. Al and Hf were only slightly electrodeposited and an electrodeposited layer was not formed when the simultaneous electrodeposition of Al and Hf was tried using molten NaCl-KCl containing 3.5 mol%AlF<SUB>3</SUB> and 3.5 mol%HfF<SUB>4</SUB>. On the other hand, an electrodeposited layer consisting of Ni<SUB>2</SUB>Al<SUB>3</SUB> and NiAl<SUB>3</SUB> layers, for which the Al<SUB>3</SUB>Hf particles were formed on the surface region, was formed, when the simultaneous electrodeposition of Al and Hf was carried out using the molten NaCl-KCl containing 3.5 mol% AlF<SUB>3</SUB> and 0.05 mol% HfF<SUB>4</SUB>. The cyclic-oxidation resistance of the Ni specimens covered by the Ni aluminide layer containing the Al<SUB>3</SUB>Hf particles was evaluated in air at 1423 K. The sample covered with the Ni aluminide containing the Al<SUB>3</SUB>Hf particles, which was formed using the melt containing 3.5 mol%AlF<SUB>3</SUB> and 0.05 mol%HfF<SUB>4</SUB>, showed a high cyclic-oxidation resistance. On this sample after the oxidation test, an adhesive scale having a spiked shape, which consisted of Al<SUB>2</SUB>O<SUB>3</SUB> as the outer layer and HfO<SUB>2</SUB> as the inner layer, was formed.
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The Japan Institute of Metals and Materials | 論文
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