Direct electrochemical preparation of Nb-10Hf-1Ti alloy

被引：38

作者：

Abdelkader, Amr M. ^{[1
]}

Fray, Derek J. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

来源：

ELECTROCHIMICA ACTA | 2010年 / 55卷 / 08期

关键词：

Electro-deoxidation; 89Nb-10Hf-1Ti; Aerospace materials; High temperature materials; MOLTEN CALCIUM-CHLORIDE; REVISED POURBAIX DIAGRAMS; TITANIUM-DIOXIDE; REDUCTION; METAL; CHROMIUM; NIOBIUM; OXIDE;

D O I：

10.1016/j.electacta.2009.12.082

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The preparation of 89Nb-10Hf-1Ti alloy by the electro-deoxidation of a porous precursor cathode made from a mixture of oxides containing the alloying elements has been investigated. The results confirmed the formation of the alloy, saturated with oxygen, after 4 h of the reduction. The X-ray diffraction (XRD) and microstructural analysis suggested that the reduction starts with the formation of niobium suboxides and calcium niobates. The calcium niobate slows down the reaction until some nonstoichiometric calcium niobate (Ca3Nb2Ox-8) starts to form. Hafnium was also observed to be reduced through the formation of calcium hafnate without any side reactions with the other alloy constituents. Alloy with the target stoichiometry containing 390 ppm oxygen was obtained after 24 h of electro-deoxidation. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：2924 / 2931

页数：8

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