The Diffusion of Air Through Monel Metal

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Abstract
The rate at which gases from the atmosphere diffuse through monel metal at various temperatures has been observed. An evacuated heavy‐walled metal tube, a section of which was machined to a thin wall, was heated in a furnace. The rate at which the pressure inside the tube increased as a result of the diffusion of gases from the atmosphere was noted. The log R vs. 1/T curves, which are usually linear, show breaks about 900°C indicating some unusual physical change occurring in the alloy at this temperature. Dilatometric measurements on the same alloy were used to check the location of this break.

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