K-1012 高速遠心成形法によるステンレス鋼焼結材料の作製(S12-1 粉末成形とその評価(1))(S12 粉末成形とその評価)

概要

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A slip of fine stainless steel powder (SUS3 16L, 4 μm) was compacted by High-speed Centrifugal Compaction Process (HCP). The powder of 80 mass% was mixed with heptane with the aid of a dispersing agent (sorbitan monostearate). The slip was poured into aluminum alloy die and rotated at 5,000-10,000 rpm for 1.2ks to form φ8 mm×30mm green compact. The green compacts were pre-sintered at 1073 K for 3.6 ks and cut into 5mm height blocks to measure packing density at each height. The compacts also were sintered in vacuum at 1223-1623K for 3.6ks to measure density and hardness at each height. There occurres shrinkage at the top 5 mm of green compacts, which is the result of insufficient pressure occurred during HCP. The amount of shrinkage can be reduced applying a higher centrifugal force, namely at higher rotational speed, since the pressure put on the compact increases in proportion to the centrifugal force. Although there occurres decrease in hardness at the bottom and the top of sintered compacts, almost the whole compacts can be used for normal parts. If the bottom and top of compacts are cut off, high precision and high quality products will be obtained.
社団法人日本機械学会の論文
2001-08-22