MANUFACTURE OF BLADE FOR ROTARY COMPRESSOR

PURPOSE:To manufacture blades for rotary compressor excellent in siezure resistance as well as in wear resistance, by mixing solid lubricants with powders of high-speed steel and alloy tool steel, by subjecting the resulting powder mixture to compacting and then to solid-phase sintering, and by appl...

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Bibliographische Detailangaben
1. Verfasser:	FUJII EIICHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BLASTING CASTING CHEMISTRY ENGINE PLANTS IN GENERAL FERROUS OR NON-FERROUS ALLOYS HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER MECHANICAL ENGINEERING METALLURGY PERFORMING OPERATIONS POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS POWDER METALLURGY PUMPS FOR LIQUIDS OR ELASTIC FLUIDS ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS STEAM ENGINES TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	PURPOSE:To manufacture blades for rotary compressor excellent in siezure resistance as well as in wear resistance, by mixing solid lubricants with powders of high-speed steel and alloy tool steel, by subjecting the resulting powder mixture to compacting and then to solid-phase sintering, and by applying sealing treatment to the surface of a sintered compact. CONSTITUTION:At the time of manufacturing blades for rotary compressor, 0.5-3.0wt% of at least one kind among BN, MoS2, and WS2 is mixed as solid lubricant with the powders of high-speed steel and Fe-Cr-Mo-V alloy tool steel as base material. The resulting mixture is press-compacted at a pressure of 4-7 tons/cm and then is subjected to solid-phase sintering at 1,180-1,220 deg.C, so that a blade composed of a sintered compact having 6.2-6.8g/cm apparent density can be manufactured. Since pores remain in the sintered blade because of solid-phase sintering, sealing surface treatment of sintered blade is applied by subjecting the sintered blade to any of the following: treatment with steam of 500-600 deg.C; nitriding treatment by immersion in a cyanogen bath; gas nitriding by means of ammonia, etc., and impregnation treatment by immersing in an aqueous solution in which ceramics such as Cr2O3, etc., is dispersed.