PLASTIC DEFORMATION IN SINTERING OF SILVER POWDER BODIES
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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Results are presented of an investigation of the effect of uniaxial tensile and compressive stresses on the kinetics of shrinkage during sintering of powder metal compacts. The experiments were conducted on compacts of electrolyticAg powder of a 44-micron fraction with a porosity of 30. The sintering temperature was 900 or - 10C. Tensile stresses were varied from 0 to 1.1 x 10 to the 6th power dynessq cm during heating periods of 6 min. At a tensile stress of 1 x 10 to the 6th power dynessq cm linear shrinkage ceased and elongation began. Volume shrinkage increased despite decreasing linear shrinkage until elongation began, then volume shrinkage decreased. Similar results were obtained when compression was applied. An analysis of the data indicated that plastic deformation does not effect the kinetics of shrinkage for short exposure.