The Effect of the Ultra-Fine Solid Additives on the Mechanical Properties of a Powder Bed [Translated]<sup>†</sup>

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Solid additives are widely used to control the mechanical properties of powders materials in many industries. In this paper, the measurement of the tensile strength of a powder bed with a split-cell type tester was conducted to elucidate the effect of solid additives on the mechanical properties of powders. <br>Fused alumina powder, silica sand, limestone, lactose and potato starch were selected as the powders. Furthermore, colloidal silica was used as a solid additive. <br>The relationship between the tensile strength and the porosity of a powder bed containing the additive was proposed to characterize the effect of additives on the mechanical properties of the powders. <br>Furthermore, the experimental results reported by others were able to be explained by the above relationship.<br><br>† This report was originally printed in J. Soc. Powder Technology, Japan, 24(7), 455-461 (1987) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.

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