水噴霧高速度鋼圧粉体の焼結中における荷重による収縮制御

概要

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A 6%W-5%Mo-4%Cr-2%V-1%C steel powder has been pressed uniaxially into cylindrical compacts, 6mm in diameter and 6mm in height, with 1% acrawax as the powder lubricant, and then sintered continuously without liquid phase in vacuum and with it in argon. Various loads have been applied to the compacts in the pressing direction during sintering in a thermomechanical analyzer, or a kind of a push-rod-type dilatometer.<BR>Sintered density is affected significantly by temperature or by the existence of the liquid phase, but does not change very much with time. Uniaxial loading during liquid phase sintering of compacts strongly influences the dimensional change, but not very much the densification. Increasing the load to tens of kilopascals gives more shrinkage in the pressing direction, while less or no shrinkage, or more expansion in the perpendicular direction.
社団法人粉体粉末冶金協会の論文