Properties of Titanium-Molybdenum Alloy Wire
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- Category: Molybdenum knowledge
- Published on 10 July 2013
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The evaporation rate characteristics of 85 per cent titanium—15 per cent molybdenum alloy wire, used as a source of titanium in sublimation pumps, has been investigated when operated at constant voltage and constant current.
Some 40 per cent of the titanium present in the alloy can be evaporated and at constant voltage 24 per cent can be evaporated at a constant predictable rate and this is the preferred method of operation.
The growth of macrocrystals occurs when the wire composition reaches 74 per cent titanium 26 per cent molybdenum and the total and spectral emissivities then change.
These emissivities have been measured and the total emissivity change explains the observed evaporation characteristics. The principal gas present in the wire is hydrogen for which the diffusion rate has been determined.
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