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The Refractory Metals

Published online by Cambridge University Press:  04 July 2016

G. Llewelyn
G. Llewelyn*
Affiliation:
Bristol Siddeley Engines Ltd
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Extract

The refractory metals are usually referred to as metals which have melting points equal to, or higher than, chromium. A number of these metals, such as chromium, molybdenum, niobium, and tungsten are already being used quite extensively as alloying elements in both ferrous and non-ferrous alloys. Tungsten has been used in the lamp industry for many years, while molybdenum has been used for heating elements and niobium has been of interest in the atomic energy field.

The advancements in design and efficiency of aero engines has been associated with an increase in engine temperature. If this advancement is to continue, it will be necessary for a new family of alloys to be made available to the engineer. The current nickel-base high temperature alloys are now approaching their limit. It is difficult to be precise about these temperatures because the applications in terms of stress vary widely.

Type
Metallic Materials
Information
The Aeronautical Journal , Volume 70 , Issue 668 , August 1966 , pp. 787 - 794
Copyright
Copyright © Royal Aeronautical Society 1966

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References

1.Llewelyn, G. The Refractory Metals As Possible Future Aero-Engine Materials, presented at the Conference on New Engineering Materials, arranged by the Institution of Mechanical Engineers and held in Birmingham, October 1965.Google Scholar
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11. Handbook Molybdenum Metal, Climax Molybdenum Co. 1960.Google Scholar
12. Courtesy of Daniel Doncaster & Sons, Ltd., Sheffield, England.Google Scholar
13.Ibid.Google Scholar
14.Metcalfe, A. G. Joining of Refractory Metals, AGARD Conference on Refractory Metals, Oslo, June 1963.Google Scholar
15. Ref. 1.Google Scholar
16.Ibid.Google Scholar
17. Ref. 14.Google Scholar
18. Ref. 1.Google Scholar
19.Ibid.Google Scholar
20.Ibid.Google Scholar
21.Ibid.Google Scholar