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High-wear resistant low-cobalt powder metallurgical valve seat

A technology of powder metallurgy and valve seat, which is applied in the field of metallurgy, can solve the problems of high price and not being widely used, and achieve the effects of improving wear resistance, improving physical properties and mechanical properties, and reducing production costs

Active Publication Date: 2013-03-27
YIZHENG CHANGDA POWDER METALLURGY PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above, many manufacturers at home and abroad use high-cobalt alloy materials. The cobalt content is generally 5-10%. Cobalt metal is a rare metal, which is expensive and is also a war preparation material. However, it has not been widely used because of its high price. use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The base powder is low-alloy powder prepared by water atomization + two kinds of (Cr, Mo) high-alloy powder + 1.2% graphite + 0.8% zinc stearate and mixed for 40 minutes. Decomposition atmosphere, temperature 1120°C, sintering for 40 minutes, test the hardness of the sintered billet HRB108~110; metallographic structure: martensite + bainite + sorbite + alloy carbide; radial crush strength: 840N / mm 2 ; Density 7.8g / cm 3 ; Chemical composition C: 0.91, Cr: 1.28, Mo: 2.68, Ni: 0.50, Co: 0.24, Cu: 14.00, and the rest Fe.

[0014] According to the overspeed durability test specification, the valve seat product developed above was run on the test bench at full speed and full load (rated speed 6000r / min, rated power 69KW, maximum torque 128N.m) for a total of 333 hours (including 22 hours and 20 minutes of running-in) , External characteristic test 1 hour 40 minutes, strengthening test 309 hours). After testing by the folding machine, the dimensions of the valve seat are all...

Embodiment 2

[0017] High wear-resistant low-cobalt powder metallurgy valve seat, the chemical composition and its content are: C: 0.8%, Cr: 1.0%, Mo: 2.0%, Ni: 0.5%, Co: 0.2%, Cu: 12%, and the balance is Fe.

[0018] The manufacturing method is the same as in Example 1, and the valve seat does not sink after the overspeed endurance test.

Embodiment 3

[0020] High wear-resistant low-cobalt powder metallurgy valve seat, the chemical composition and its content are: C: 1.2%, Cr: 3.0%, Mo: 4.0%, Ni: 1.2%, Co: 0.5%, Cu: 30%, and the balance is Fe.

[0021] The manufacturing method is the same as in Example 1, and the valve seat does not sink after the overspeed endurance test.

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PUM

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Abstract

The invention discloses a high-wear resistant low-cobalt powder metallurgical valve seat. The valve seat comprises the following chemical components in percentage by weight: 0.8 to 1.2 percent of C, 1.0 to 3.0 percent of Cr, 2.0 to 4.0 percent of Mo, 0.5 to 1.2 percent of Ni, 0.2 to 0.5 percent of Co, 12 to 30 percent of Cu and the balance of Fe. High-pressure water atomization powder preparation technology is improved, a certain amount of Cr and Mo alloy power are added reasonably, and mechanical mixing, pressing and sintering are performed. Due to the adoption of a copper infiltration process, the physical properties and mechanical properties of the valve seat such as thermal conductivity, heat intensity, wear resistance and the like are improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a powder metallurgy valve seat with high wear resistance and low cobalt. Background technique [0002] The valve seat is an important part of the automobile engine. It forms a pair of important sealing friction pairs with the valve. When the engine is working, the valve seat is impacted by the valve, and the high-temperature (530-810°C) combustion gas is scoured, corroded, and combustion products, air In addition, it is subject to the alternating action of heat and cold stress, which is easily deformed, burned, and even broken. Therefore, not only the valve seat material is required to be wear-resistant, corrosion-resistant, and high-temperature resistant, but also requires a certain longitudinal crushing strength. [0003] In view of the above, many manufacturers at home and abroad use high-cobalt alloy materials. The cobalt content is generally 5-10%. Cobalt metal is a rare ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/52F01L3/02
Inventor 周学斌奚杰
Owner YIZHENG CHANGDA POWDER METALLURGY PROD CO LTD