Interfacial effects between platinum alloys containing oxide dispersions
F. G. Wilson, R. Stanley
Aug 1, 1984
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High Temperature Technology
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Key Takeaway Key Takeaway: Oxide dispersion strengthened platinum can form fine porosity in oxide-containing alloys when joined to other alloys, requiring a practical means to eliminate this issue.
Abstract
AbstractOxide dispersion strengthened (ODS) platinum offers significant advantages over conventional wrought platinum alloys, particularly for aPfJications requiring very high strength and surface stability at temperatures up to 1650°C. In order to exploit these advantages in practical fabrications, it is frequently necessary to join ODS platinum to conventional platinum alloys by either solid-state or fusion welding techniques. Laboratory tests have shown that, when alloys of different composition are joined to an oxide-containing alloy, and when the weld is exposed for extended times at very high temperatures, a band of fine porosity can be formed in the oxide-containing material adjacent to the weld. The effect, which has not been previously reported, has been attributed to a Kirkendall diffusion mechanism; the enhanced porosity formation only occurs in the presence of the oxide dispersion. The conditions under which the phenomenon might occur in practice are established and a practical means of elimin...