Warm processing powdered iron, and preparation method

Abstract

A warm-pressing iron powder is prepared from reductive iron powder, polar graphite powder, lubricant PEG, adhesive PVP, Ni powder, Cu powder and Mo powder through high-temp reduction of the scales of low-carbon steel to obtain sponge iron, crushing, ball grinding, further reduction, crushing, grinding, sieving to obtain reductive iron powder, adding Ni powder, Cu powder and Mo powder, removing stress by tempering in vacuum or protecting atmosphere, adding PVP, mixing, adding polar graphite powder and PEG, mixing, drying at 50 deg.C, and sieving.

Description

Technical field: [0001] The invention relates to a metal powder forming warm-pressing technology, in particular to a warm-pressed iron powder and a preparation method thereof. Background technique: [0002] Warm pressing technology is a new method of manufacturing high-performance powder metallurgy parts. At present, the warm-pressed powder generally uses atomized iron powder as the raw material, and partly pre-alloyed iron powder is obtained through partial pre-alloying treatment, and then an appropriate polymer lubricant and powder binder are added to form a warm-pressed powder. At 20,000-30,000 yuan / ton, it is 3-4 times that of ordinary iron powder. The disadvantage of the existing technology is that the warm-pressed iron powder uses atomized iron powder as raw material, and its cost is high, thus limiting the development and application of a large number of high-quality and cheap iron-based powder metallurgy parts; Regular, loose specific gravity is small, which makes ...

AI Technical Summary

Problems solved by technology

The disadvantage of the existing technology is that the warm-pressed iron powder uses atomized iron powder as raw material, and its cost is high, thus limiting the development and application of a large number of high-quality and cheap iron-based powder metallurgy parts; Regular, loose specific gravity is small, which makes powder flow and rearrangement difficult during warm pressing, and internal friction resistance is large, resulting in warm compact density not reaching 7.2g / cm 3 ;Usually the amount of graphite powder added to warm-pressed iron powder is 0.5%. If it exceeds, the density of the warm-pressed blank will decrease, which is a technical problem for the production of high-carbon-content and high-hardness parts.