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Powder metallurgy valve seat and preparation method thereof

A powder metallurgy and valve seat technology, applied in the field of materials, can solve the problems of large differences, increase the cost of use, unfavorable supporting production, etc., achieve excellent mechanical properties, improve mechanical properties and wear resistance, excellent lubricating properties and anti-rust properties. Effect

Inactive Publication Date: 2015-12-16
SUZHOU NETABHAPE COMPOSITE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the valve seat needs to cooperate with the valve, the mechanical energy requirements for the powder alloy are relatively strict. Moreover, the valve seat is mostly made of iron-based powder alloy, which is quite different from the cobalt-based powder alloy material, which will also lead to It is not conducive to supporting production and increases the cost of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A powder metallurgy valve seat prepared from the following components in parts by mass:

[0023] 85 parts of iron powder, 1 part of gold powder, 5 parts of graphite powder, 5 parts of metal copper powder, 3 parts of tin antimony oxide, 4 parts of silicon dioxide, 1 part of nano cerium, 5 parts of manganese dioxide, 3 parts of cobalt powder, naphthene 4 parts of lead acid and 5 parts of synthetic sodium sulfonate.

[0024] A method for preparing a powder metallurgy valve seat, the preparation steps are as follows:

[0025] (1) Put all the components into a ball mill for grinding and mixing, and take out after mixing evenly;

[0026] (2) Put the uniformly mixed powder in step (1) into a mold for compression molding, the molding pressure is 255MPa, and take out after molding to obtain a blank;

[0027] (3) Carry out high-temperature calcination of the blank obtained in step (2) in a vacuum environment at a temperature of 1100°C, a pressure of 525 MPa, and a time of 4-9 h...

Embodiment 2

[0032] A powder metallurgy valve seat prepared from the following components in parts by mass:

[0033] 105 parts of iron powder, 2 parts of gold powder, 10 parts of graphite powder, 12 parts of metal copper powder, 8 parts of tin antimony oxide, 9 parts of silicon dioxide, 3 parts of nano cerium, 10 parts of manganese dioxide, 10 parts of cobalt powder, naphthene 7 parts of lead acid and 12 parts of synthetic sodium sulfonate.

[0034] A method for preparing a powder metallurgy valve seat, the preparation steps are as follows:

[0035] (1) Put all the components into a ball mill for grinding and mixing, and take out after mixing evenly;

[0036] (2) Put the uniformly mixed powder in step (1) into a mold for compression molding, the molding pressure is 255MPa, and take out after molding to obtain a blank;

[0037] (3) Carry out high-temperature calcination of the blank obtained in step (2) in a vacuum environment at a temperature of 1100°C, a pressure of 525 MPa, and a time ...

Embodiment 3

[0042] A powder metallurgy valve seat prepared from the following components in parts by mass:

[0043] 100 parts of iron powder, 2 parts of gold powder, 9 parts of graphite powder, 10 parts of metal copper powder, 7 parts of tin antimony oxide, 7 parts of silicon dioxide, 3 parts of nano cerium, 9 parts of manganese dioxide, 9 parts of cobalt powder, naphthene 7 parts of lead acid and 10 parts of synthetic sodium sulfonate.

[0044] A method for preparing a powder metallurgy valve seat, the preparation steps are as follows:

[0045] (1) Put all the components into a ball mill for grinding and mixing, and take out after mixing evenly;

[0046] (2) Put the uniformly mixed powder in step (1) into a mold for compression molding, the molding pressure is 255MPa, and take out after molding to obtain a blank;

[0047] (3) Carry out high-temperature calcination of the blank obtained in step (2) in a vacuum environment at a temperature of 1100°C, a pressure of 525 MPa, and a time of ...

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PUM

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Abstract

The invention discloses a powder metallurgy valve seat and a preparation method thereof and relates to the technical field of powder metallurgy. The valve seat is prepared from the following components in parts by mass: 85-105 parts of iron powder, 1-2 parts of gold powder, 5-10 parts of graphite powder, 5-12 parts of metallic copper powder, 3-8 parts of tin antimony oxide, 4-9 parts of silicon dioxide, 1-3 parts of nanometer cerium, 5-10 parts of manganese dioxide, 3-10 parts of cobalt powder, 4-7 parts of lead naphthenate and 5-12 parts of synthetic sodium sulfonate. The preparation method of the powder metallurgy valve seat comprises the steps of mixing, mould pressing, high-temperature calcining, steam treatment, oil impregnation treatment and shaping treatment. The valve seat provided by the invention is excellent in wear-resisting property, high-temperature-resisting property and mechanical property and is effectively prolonged in service life.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a powder metallurgy valve seat and a preparation method thereof. Background technique [0002] The valve seat is an auto part corresponding to the engine valve guide. The valve seat is the part where the intake port and exhaust port of the cylinder head of the engine are in contact with the valve sealing cone surface. Its main function is to cooperate with the valve to close the cylinder. During use, due to the work of the engine cylinder, the heat load of the valve seat is large, the temperature difference changes greatly, and it is also impacted when the valve is seated. The service life is shorter. [0003] In view of the harsh operating environment of the valve seat, materials with excellent high temperature resistance, good wear resistance and corrosion resistance become one of the keys to prolong the service life of the valve seat. Existing valve seat has c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/16
Inventor 刘莉王爽邱晶刘晓东黄明明
Owner SUZHOU NETABHAPE COMPOSITE MATERIALS
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