焼結アルミニウム合金（SAP）の製造法に関する研究

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  • On the Production Techniques of Sintered Aluminium Alloy
  • ショウケツ アルミニウム ゴウキン SAP ノ セイゾウホウ ニ カンスル ケンキュウ

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Each process of production techniques of sintered aluminium alloy was studied experimentally by using atomized aluminium powder as starting material. The optimum condition was determined for each process in regarding with the properties of produced alloys.<BR>The results obtained are as following:<BR>(1) The optimum pressure for powder compaction at room temperature was 5 ton/cm2 in taking account of densification and crack formation in compact. At this pressure the powders containing 10∼15 wt% oxide were compacted to a density of 2.2∼2.5 g/cm3, with a compacting factor of 3.0∼3.5.<BR>(2) In extrusion of the hot pressed compact much sounder material of uniform density was produced than in that of the cold compacted powder using the lower extrusion ratio, although the extrusion pressure increased about 10%.<BR>(3) In order to prevent the occurence of defects in the extruded products it is preferable to use of conical die designed to be minimized the shear component in material flow.<BR>(4) For leveling down of the extrusion pressure the using of appropriate lubricant and the higher extrusion speed is advantageous.<BR>As the hot pressed compact containing 11.6 wt% oxide was extruded at 500°C by using a 15:1 ratio and a lubricant of colloidal graphite in extrusion speed of 47 mm/sec, the extrusion pressure became lower than 40 kg/mm2.

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