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Sintered metal parts and method for the manufacturing thereof

A technology of metal parts and sintered metal, which is applied in the field of powder metal parts, can solve the problems of reducing bending fatigue strength, increasing additional costs, and low contact fatigue strength

Inactive Publication Date: 2007-04-11
HOGANAS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A problem with gears formed by powder metal methods is that powder metal gears have reduced bending fatigue strength in the tooth root region of the gear and lower contact fatigue strength
However, the proposed methods all include the step of adding additional cost

Method used

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  • Sintered metal parts and method for the manufacturing thereof
  • Sintered metal parts and method for the manufacturing thereof
  • Sintered metal parts and method for the manufacturing thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0057] Two mixtures were prepared by mixing well before pressing: Mixture 1A and Mixture 1B.

[0058] Mixture 1A was based on powder A with the addition of 0.2% by weight of graphite and 0.8% by weight of H wax.

[0059] Mixture 1B was based on powder B with the addition of 0.2% by weight of graphite and 0.2% by weight of cetyl-trimethoxysilane.

[0060] Pressed FS strength test bars according to ISO 3928.

[0061] A test bar based on Mixture 1A was compressed to 7.1 g / cm 3 The density of the green body was pre-sintered at 780°C for 30 minutes in an atmosphere containing 90% nitrogen and 10% hydrogen. After sintering, the sample was subjected to a second pressing at a pressure of 1100 MPa and finally sintered at 1280° C. for 30 minutes in an atmosphere containing 90% nitrogen and 10% hydrogen. The measured sintered density reaches 7.61g / cm 3 .

[0062] The samples prepared with Mixture 1B were pressed at 1100 MPa by a single press method, followed by sintering at 1280°C f...

example 2

[0073] Two mixtures were prepared by mixing well before pressing: Mixture 2C and Mixture 2D.

[0074] Mixture 2C was based on powder C with the addition of 0.7% nickel powder, 0.2% by weight graphite and 0.8% by weight H wax.

[0075] Mixture 2D was based on powder D with the addition of 0.7% nickel powder, 0.2% graphite and 0.2% cetyl-trimethoxysilane.

[0076] FS-strength test bars were prepared according to ISO 3928.

[0077] Compress the test bar based on mixture 2C to 7.1 g / cm 3 The density of the green body was pre-sintered at 780°C for 30 minutes in an atmosphere containing 90% nitrogen and 10% hydrogen. After sintering, the sample was subjected to a second pressing at a pressure of 1100 MPa and finally sintered at 1280° C. for 30 minutes in an atmosphere containing 90% nitrogen and 10% hydrogen. The measured sintered density reaches 7.63g / cm 3 .

[0078] The test bars prepared with mixture 2D were pressed at 1100 MPa by one-shot pressing, followed by sintering at ...

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Abstract

The invention concerns a sintered metal part which has a densified surface and sintered density of at least 7.35 g / cm3 and a core structure distinguished by a pore structure obtained by single pressing to at least 7.35 g / cm3 and single sintering of a mixture of a coarse iron or iron-based powder and optional additives.

Description

technical field [0001] This invention relates to powdered metal parts. [0002] In particular, the present invention relates to sintered metal parts having densified surfaces and suitable for demanding applications. The invention also includes methods of making these metal parts. Background technique [0003] The use of powder metallurgy to produce structural parts has several advantages over conventional matching methods of full dense steel. Energy consumption is much lower and material utilization is much higher. Another important advantage of powder metallurgy is that components in their final or near-net shape can be produced directly after the sintering process without costly shaping such as turning, milling, drilling or grinding. However, fully dense steel materials generally have superior mechanical properties compared to PM (powder metallurgy) parts. Therefore, efforts must be made to increase the density of PM components in order to achieve values ​​as close as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/12B22F3/24C22C33/02B22F
CPCC22C33/02B22F2998/10B22F2003/023B22F2003/166B22F2999/00B22F3/18B22F9/082B22F3/02B22F3/1007B22F3/16B22F1/00B22F3/12
Inventor P·斯科格隆M·凯泽尔曼A·伯格马克
Owner HOGANAS AB
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