水噴霧SUS 316Lステンレス鋼粉の圧縮,焼結性に及ぼす粒度分布および酸化被膜の影響

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  • Effect of size distribution and oxide layer on pressing and sintering of water-atomized SUS 316L stainless steel powders
  • ミズ フンム SUS316L ステンレス コウフン ノ アッシュク ショウケツ

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Pressing and sintering of SUS. 316L stainless steel powders were studied under various size distribution and amount of surface oxidation.<BR>The results were summarized as follows:<BR>1) Compressibility was higher with mixtures of about 40/60 coarse/-325 mesh powders (permitting some difference in compacting pressure), mainly because of change in shape with particle size.<BR>2) When vacuum-sintered at temperature above 1200°C, -325 mesh size distribution gave maximum sintered density. In other words, the sintering rate was controlled by mixing ratio of fine powders to coarse powders.<BR>3) Oxide layer of stainles steel powder gave poor compressibility, and also-less densification because of delaying effect on mass transport during sintering.<BR>4) Residual oxide layer (inclusion) affected pore-morphology in sintered materials. Therefore, the mecha-nical properties were appreciably deteriorated under higher sintered density with oxygen-content over 0.3 pct.

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