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Hitachi Powdered Metals

Hitachi Chemical

Warm compacting

Warm compacting is technology to obtain green compact with higher strength than that of normal compacting technology. Key of this technology is to keep temperature of mixed powder at specific level during compaction.

Warm compactingConventional enjineering methodWarm compacting

Sintered aluminum alloy

Sintered aluminum alloy that is produced under careful technology of material design and production provides excellent wear resistance and mechanical properties in compared with properties of die cast material. This alloy permits reduction on size and weight of connecting rods used in general-purpose engines.

Sintered aluminum alloy

Sintered bearings impregnated with magnetic fluid

This unique bearing assures excellent endurance as used for ultra high-speed rotating spindle motors (up to 30,000 rpm) because magnetic fluid used provides both fluid sealing and lubrication effects. Also high-accuracy rotation (low NRRO and low noise) was achieved by adopting design of dynamic pressure on internal diameter.

Sintered bearings impregnated with magnetic fluid

test result

Diffusion bonding

Diffusion bonding technology is able to reduce or eliminate machining as a result of high bonding force on multi separate pieces by well- controlled diffusion of each element. Adopting this technology is able to expand applications of the powder metallurgy on complicated parts because of its near net shape which leads to cost reduction.

Diffusion bonding

Multi-steps compacting

Computer-control on moving of each parts of tool ensures uniformity of local density. Also the technology made possible thin-wall compacting and multi-steps on upper and lower punches sides. Near net shape compacting result in cost reduction because of less or elimination on machining.

Multi-steps compacting

High-strength materials

Optimizing contents of Nickel, Copper, and/or Molybdenum results in higher strength as compared with conventional sintered materials. Some products reach certain hardness without quenching through careful material design on raw powders and such materials are introduced in market

Chemical Composition (wt.%)
  Fe Ni Cu Mo C Features of material
ENKMA-6 Bal 4.0 1.5 0.5 0.6 Most popular high strength material
Either of as sintered or as heat treated
EHS-66 Bal 2.0 - 0.6 0.6 Improved dimensional stability
Recommended as sintered
EHA-66 Bal 0.6 - 0.6 0.6 Improved dimensional stability
Recommended as heat treated
EHS-86 Bal 6.0 1.0 0.5 0.6 Highest strength as sintered due to Martensite without Quenching

High-strength materials

Environmentally-friendly materials

Lead free materials having equal or better performance were developed as a substitute for materials containing Lead.

KA-4
KA-4

EG-1
EG-1