The influence of porosity and alloying elements on tungsten-based composites thermal conductivity
Source abstract
Abstract
The thermal conductivity coefficients of sintered tungsten and tungsten-based W-C, W-C-Y2O3, and W-C-Cu composites were evaluated via direct heat flow measurements. Porosity increase from 5 to 16% in combination with the grain size reduction has lowered pure tungsten thermal conductivity from 146 W/mK to 110 W/mK. Tungsten grain boundary thermal insulance has been evaluated as YW-W = 6·10-9 m2K/W.Adding 1.9 wt.% of carbon decreased tungsten thermal conductivity by 80% to 29 W/mK. This decrease was shown to be caused by the W2C layer forming on the W grains during the hot pressing. The W-W2C boundary thermal insulance was calculated as YW-W2C = 13.5·10-9 m2K/W and was shown to be crucial in low W-W2C material thermal conductivity. Complex tungsten-based composites will most likely have significantly reduced thermal conductivity due to the grain boundary thermal insulances.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced materials and composites · Advanced ceramic materials synthesis · Intermetallics and Advanced Alloy Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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