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Lubricant powder for powder metallurgy

A technology of powder metallurgy and lubricants, which is applied in the directions of lubricating compositions, additives, transportation and packaging, and can solve problems such as difficulties in the preparation of atomized powder compacts

Inactive Publication Date: 2007-03-07
HOGANAS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compacts with higher green strengths now in use are advantageously produced from sponge iron powder, however, although atomized powders are more compressible and thus give higher green densities, in the case of atomized powder compaction Difficulties encountered in the preparation of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This example shows the importance of using a lubricant composition according to the invention, and that poorer results are obtained with less than 10% or more than 60% PEO in the lubricant composition.

[0042] Mix atomized iron powder, 2% copper powder, 0.5% graphite and 0.8% new lubricant. The iron powder was ASC 100.29 from Höganös AB, Sweden, the copper powder had an average particle size of 75 μm and the graphite powder had an average particle size of 5 μm. The new lubricant is composed of oligoamide Orgasol with a weight average molecular weight of 6,000  and PEO with an average molecular weight of 100,000 to 200,000. The micronized lubricant was sieved to maintain an average particle size of less than 75 μm.

[0043] Five different lubricant samples, including the novel lubricant, were prepared with compositions listed in Table 1 below.

[0044] Composition number

[0045] As a control, ethylene bisstearamide, often abbreviated EBS, was also used. ...

Embodiment 2

[0050] This example shows the effect of mixing polyoxyethylene with the commonly used EBS (ethylene bisstearamide). The test was carried out using the same powder and the same amount of lubricant as in Example 1. As can be seen in Table 3 below, there is essentially no improvement in green strength when PEO is mixed with EBS.

[0051] 100%

Embodiment 3

[0053] This example shows that high green strength can also be obtained for green parts with relatively low density, ie for example powder compositions compacted at low pressure.

[0054] The following mixtures were prepared.

[0055] Mixture 1

NC100.24+20%Cu+0.75% (PEO / Orgasol 20 / 80)

mixture 2

NC100.24+20% Cu+0.75% zinc stearate

Mixture 3

MH 80.23+20%Cu+0.75% (PEO / Orgasol 20 / 80)

Mixture 4

MH 80.23+20% Cu+0.75% zinc stearate

[0056] NC 100.24 is a sponge iron powder from Hgans AB, Sweden.

[0057] MH80.23 is sponge iron powder from Hgans AB, Sweden.

[0058] Mixtures 1 and 3 contained 20% PEO and 80% Orgasol. Mixtures 2 and 4 containing zinc stearate were used as references. These mixtures were pressed under a pressure of 230 MPa, and as seen from Table 5 below, compacts with relatively low green density can also have high green strength. The low Rattler values ​​shown indicate that, according to the invention, the ...

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PUM

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Abstract

The invention concerns new lubricants comprising a combination of a polyethylene oxide and an oligomer amide and an improved metallurgical powder composition comprising a major amount of an iron-based powder and a minor amount of this new lubricant. Furthermore, the invention concerns a method requiring low ejection force and low ejection energy for producing green products having high green strength. The method comprises the steps of mixing an iron-based powder and optional additives with the new lubricant and compacting the obtained powder composition.

Description

technical field [0001] The present invention relates to novel lubricants for metallurgical powder compositions and metal powder compositions containing these lubricants. In particular, the invention relates to iron-based powder compositions including novel lubricants and compacts made from these compositions, characterized by high green strength. Background technique [0002] Green strength is one of the most important physical properties of green parts. The larger the size and the more complex the geometry of the P / M part, the more important this property is. Green strength increases with compact density and is affected by the type and amount of lubricant mixed into the powder. Compact strength is affected by the type of powder used. Another possibility for obtaining high compact strength is to carry out the mixing and / or pressing of metal powders at elevated temperatures. High green strength is necessary in order to avoid that the compact breaks when it is removed from...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C10M107/34B22F1/10B22F3/02C10M107/44C10M125/04C10M133/56C10N10/16C10N20/04C10N20/06C10N40/00C10N50/08
CPCB22F1/0059B22F2003/023B22F1/10B22F1/00
Inventor M·拉姆斯泰特
Owner HOGANAS AB
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