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Iron-based powder combination

A technology of iron-based powder and composition, applied in the field of iron-based powder metallurgy composition, can solve the problems of sintered component size and mechanical property change, dust and segregation, etc.

Active Publication Date: 2008-01-23
HOGANAS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this causes dusting and segregation problems, which lead to changes in the dimensions and mechanical properties of the sintered part

Method used

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  • Iron-based powder combination
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Examples

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example 1

[0030] This example illustrates how to select an alloy composition with a desired strength of about 600 MPa and three levels of dimensional change (-0.1%, 0.0%, and +0.1%). In the powder composition according to Table 1, this selection was made for two carbon contents, 0.5% C and 0.3% C, respectively, where as shown in Table 2, the lower carbon content gives a preferred elongation sex.

[0031] The powder composition of the present invention is prepared from the following powders: Powder A, in which 10% copper is diffusion alloyed onto the surface of an iron-based powder pre-alloyed with 0.85% molybdenum; Powder B, in which 5% nickel is diffusion alloyed onto the surface of an iron-based powder pre-alloyed with 0.85% molybdenum; and Powder C, an iron-based powder pre-alloyed with 0.85% molybdenum.

[0032] The powder composition was mixed together with 0.8% amide wax and graphite as a lubricant to give a sintered carbon content of 0.3% and 0.5%, respectively. The resulting m...

example 2

[0040] As shown in Table 3, this example illustrates a powder composition of the present invention comprising 0.6% Cu and 2% Ni, and a specific example where the dimensional change is independent of carbon content and sintered density. The results obtained with these compositions were compared with those obtained with Distaloy AB (commercially available from Höganäs AB, Sweden) and with a powder composition of the invention having the same chemical composition but prealloyed with molybdenum. The results obtained for iron-based powders whose surfaces were diffusion alloyed with copper and nickel (referred to as "fixed compositions" in Table 3) were compared.

[0041] The powder composition of the present invention is prepared from powder A, wherein 10% copper is diffusion alloyed to the surface of an iron-based powder prealloyed with 0.85% molybdenum; powder B, wherein 5% nickel is diffusion alloyed to The surface of an iron-based powder pre-alloyed with 0.85% molybdenum; and P...

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Abstract

The present invention relates to a powder metallurgical composition comprising an iron-based powder A consisting essentially of core particles pre-alloyed with molybdenum and having 6-15 wt. % and preferably 8-12 wt. % diffusion alloy copper in the core particles; iron-based powder B, the iron-based powder mainly comprising iron core particles pre-alloyed with molybdenum and having 4.5-8 wt % and preferably 5-7 wt % diffusion alloyed in The nickel of the core particles; and an iron-based powder C, the powder C mainly comprising iron core particles pre-alloyed with molybdenum. The present invention also relates to powders A and B themselves. In addition, the present invention relates to a method for producing an iron-based sintered component comprising 0.3-2 wt % molybdenum, 0.2-2 wt % and preferably 0.4-0.8 wt % copper and 0.1-4 wt % nickel , and a method of obtaining a sintered component having a predetermined strength and a predetermined dimensional change during sintering.

Description

technical field [0001] The invention relates to an iron-based powder metallurgy composition and a method for preparing sintered powder metallurgy components using the composition. More specifically, the present invention relates to sintered components comprising copper, nickel and molybdenum produced using these compositions. Background technique [0002] Copper, nickel and molybdenum have long been used in powder metallurgy as alloying elements for the production of high-strength sintered components. [0003] Sintered iron-based components can be produced by mixing alloying elements with pure iron powder. However, this causes dusting and segregation problems, which in turn lead to changes in the dimensions and mechanical properties of the sintered part. To prevent segregation, alloying elements can be pre-alloyed or diffusion alloyed with iron powder. In one method, molybdenum is prealloyed with iron powder, which is then diffusion alloyed with copper and nickel to produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02B22F1/00C22C38/16C22C38/08
CPCC22C33/0207C22C38/12C22C38/08C22C38/16C22C33/02B22F1/00
Inventor M·拉松
Owner HOGANAS AB