Iron-based powder mixture, and method of manufacturing iron-based compacted body and iron-based sintered body

A technology of mixed powder and iron-based powder, which is applied in the field of press-formed mixed powder, iron-based powder sintered body, and mixed powder for powder metallurgy

Active Publication Date: 2009-03-11
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The present invention advantageously solves the above-mentioned problems, and its purpose is to provide an iron-based mixed powder for powder metallurgy, which will not adversely affect the furnace environment of the calciner during sintering of the formed body, and can obtain Excellent formability capable of high-density forming in a low temperature range

Method used

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  • Iron-based powder mixture, and method of manufacturing iron-based compacted body and iron-based sintered body
  • Iron-based powder mixture, and method of manufacturing iron-based compacted body and iron-based sintered body
  • Iron-based powder mixture, and method of manufacturing iron-based compacted body and iron-based sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Add various lubricant powders (primary additives) to various iron-based powders, natural graphite powders (average particle size: 5 μm) and / or copper powders (average particle size: 25 μm) shown in Table 2, and stir with a high-speed bottom After heating to 140°C while mixing in a type mixer, cool to below 60°C, add various lubricant powders (secondary additives), stir at 500rpm for 1 minute, and discharge the mixed powder from the mixer. The types and compounding quantities of the primary and secondary additives are recorded in Table 2 together. The added amount (parts by mass) of the lubricating material represents the ratio of the iron-based powder, natural graphite powder, and copper powder to the total mass 100% in outer numbers, and is approximately the same as the numerical value expressed in inner numbers. In addition, the average particle diameters of the talc powder and steatite powder were 6 μm and 4 μm, respectively.

[0109] In addition, for comparison, a ...

Embodiment 2

[0123] Add various lubricants (primary additives) to various iron-based powders, natural graphite powders and / or copper powders shown in Table 5, heat to 140°C while mixing with a high-speed bottom mixer, and cool to Below 60°C, add various lubricants (secondary additives), stir at 500rpm for 1 minute, and discharge the mixed powder from the mixer. The types and compounding quantities of the primary and secondary additives are recorded in Table 5 together. The raw materials used are those described in Table 1 as in Example 1.

[0124] In addition, for comparison, it is prepared to add 0.6% by mass of ethylene bisstearamide to the powder of the same iron-based powder, natural graphite powder and / or steel powder composition as above and mix it with a V-shaped container rotary mixer to obtain mixed powder (comparison material).

[0125] Next, each iron-based mixed powder obtained at room temperature was filled into a superhard flat mold with an inner diameter of 11 mm heated in...

Embodiment 3

[0137] Add various lubricants (primary additives) to various iron-based powders, natural graphite and / or copper powders shown in Table 7, heat to 140°C while mixing with a high-speed bottom mixer, and cool to 60°C. Below ℃, add various lubricants (secondary additives), stir at 500rpm for 1 minute, and discharge the mixed powder from the mixer. The types and compounding quantities of the primary and secondary additives are recorded in Table 7. The raw materials used are the same as in Example 1.

[0138] And, for comparison, mixed powders in which ethylene bisstearamide was added by weight and mixed with a V-shaped container rotary mixer were produced.

[0139] Next, each of the obtained iron-based mixed powders was heated to 60°C, and then filled into a superhard flat plate with an inner diameter of 11 mm that was preheated so that the temperature of the wall surface of the chamber was 80°C and coated with lithium stearate powder. In the mold, press molding was performed at ...

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Abstract

An iron-base mixed powder for powder metallurgy which comprises an iron-base powder and at least one member selected from between talc and steatite and preferably further contains a metal soap.This mixed powder does not produce adverse effect on furnace atmosphere in sintering a compact of the powder and exhibits excellent compactibility even in a low-temperature region of below 100 DEG C and the sintered compact made from the powder is favorably excellent in machinability.

Description

technical field [0001] The present invention relates to an iron-based powder mixture in which a lubricant and, if necessary, an alloying powder are mixed in an iron-based powder. The iron-based mixed powder of the present invention is also suitable for powder metallurgy (powder metallurgy), especially suitable for compaction in the temperature range from normal temperature to less than 100°C. [0002] The present invention also relates to mixed powders for powder metallurgy suitable for the manufacture of high-strength sintered parts for automobiles. [0003] In addition, the present invention also relates to a method for manufacturing an iron-based powder compacted body using the iron-based mixed powder as a raw material, and a method for manufacturing an iron-based powder sintered body (sintered body) using the iron-based powder compact as a raw material method. Background technique [0004] The iron-based mixed powder for powder metallurgy is usually produced by adding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F1/00C22C33/02C22C38/00B22F1/10B22F1/105
CPCB22F2998/10B22F2999/00C22C38/12C22C38/08C22C38/16B22F1/0003C22C33/0264B22F1/10B22F1/00B22F1/105B22F3/02B22F3/10
Inventor 尾崎由纪子尾野友重宇波繁藤长政志
Owner JFE STEEL CORP
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