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Composite powder material for making high-performance abrasion resistant exhaust valve seat, and its application

A composite powder and exhaust valve technology, which is applied to other manufacturing equipment/tools, turbines, engine components, etc., can solve the problems of research and patent reports on the preparation method of exhaust valve seat, so as to achieve difficult segregation and process Simple, high-tech effects

Inactive Publication Date: 2014-06-25
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no research and patent report on the preparation method of this type of exhaust valve seat

Method used

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  • Composite powder material for making high-performance abrasion resistant exhaust valve seat, and its application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A composite powder material for preparing a high-performance wear-resistant exhaust valve seat, its mass percentage composition is: Mo: 8%, Ni: 6%, Cr: 1%, V: 1.5%, Cu: 1%, impurities ≤1%, the balance is Fe.

[0023] The method for preparing the exhaust valve seat from the composite powder material is as follows:

[0024] (1) Add graphite and zinc stearate with a particle size of less than 325 mesh into the composite powder material, graphite is 0.5% of the mass of the composite powder material, and zinc stearate is 0.8% of the mass of the composite powder material. Fully mix in a feeder for 1 hour, and press to form at a pressure of 600Mpa.

[0025] (2) Sintering at 1120°C for 0.5 hours in an ammonia decomposition atmosphere, the flow rate of hydrogen in the sintering atmosphere is 3.0L / min, and the flow rate of nitrogen protection is 4.0L / min, high-performance wear-resistant powder can be produced without finishing Metallurgical exhaust valve seats.

[0026] figur...

Embodiment 2

[0029] A composite powder material for preparing a high-performance wear-resistant exhaust valve seat, its mass percentage composition is: Mo: 10%, Ni: 6%, Cr: 1%, V: 1.5%, Cu: 1%, impurities ≤1%, the balance is Fe.

[0030] The method for preparing the exhaust valve seat from the composite powder material is as follows:

[0031] (1) Graphite and zinc stearate with a particle size of less than 325 mesh are added to the composite powder material, wherein graphite graphite is 1% of the composite powder material mass, and zinc stearate graphite is 0.8% of the composite powder material mass, Fully mix in a three-dimensional mixer for 1 hour, and press to form at a pressure of 600Mpa.

[0032] (2) Sinter at 1120°C for 0.5 hours in an ammonia decomposition atmosphere. The exhaust valve seat can be sintered in multiple layers according to the sintering requirements. The flow rate of hydrogen in the sintering atmosphere is 3.0L / min, and the flow rate of nitrogen protection is 4.0L / mi...

Embodiment 3

[0035] A composite powder material for preparing a high-performance wear-resistant exhaust valve seat, its mass percentage composition is: Mo: 10%, Ni: 6%, Cr: 1%, V: 1.5%, Cu: 1%, impurities ≤1%, the balance is Fe.

[0036] The method for preparing the exhaust valve seat from the composite powder material is as follows:

[0037] (1) Graphite and zinc stearate with a particle size of less than 325 mesh are added to the composite powder material, wherein graphite graphite is 1.5% of the composite powder material mass, and zinc stearate graphite is 0.8% of the composite powder material mass, Fully mix in a three-dimensional mixer for 1 hour, and press to form at a pressure of 700Mpa.

[0038] (2) Sinter at 1120°C for 0.5 hours in an ammonia decomposition atmosphere. The exhaust valve seat can be sintered in multiple layers according to the sintering requirements. The flow rate of hydrogen in the sintering atmosphere is 3.0L / min, and the flow rate of nitrogen protection is 4.0L / ...

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Abstract

The invention discloses a composite powder material for making a high-performance abrasion resistant exhaust valve seat, and its application, and belongs to the technical field of making of exhaust valve seats. The composite powder material comprises, by mass, 8-12% of Mo, 4-8% of Ni, 0.5-2.5% of Cr, 1-3% of V, 0-2.5% of Cu, 0.5-2.0% of C, 1% or less of impurities, and the balance Fe. A making method of the exhaust valve seat comprises the following steps: 1, powder preparation: preparing iron-based pre-alloy powder with the granularity of 100 meshes through a pre-alloy diffusion process; 2, compacting: adding graphite having an amount accounting for 0.5-2.0% of the mass of the composite powder material and zinc stearate having an amount accounting for 0.5-1.0% of the mass of the composite powder material, and compacting under a pressure of 600-800Mpa; and 3, sintering: sintering in ammonia decomposition atmosphere for 0.5-1h to make the high-performance abrasion resistant exhaust valve seat. The method has the advantages of simple flow and high technical content, and the made exhaust valve seat has the advantages of unlikely segregation and good abrasion resistance, and is suitable for the automobile industry.

Description

technical field [0001] The invention belongs to the technical field of preparing exhaust valve seats for automobiles, and in particular relates to a composite powder material for preparing high-performance, wear-resistant exhaust valve seats and its application. Background technique [0002] Powder metallurgy is an advanced manufacturing technology that integrates materials and parts preparation and forming technology. It has the advantages of energy saving, material saving, high efficiency, near-net shape, and no pollution. The amount of powder metallurgy parts used is one of the indicators to measure the development level of a country's automobile, and it also represents the development level of the country's powder metallurgy technology. [0003] In recent years, my country's powder metallurgy product manufacturers have increased investment in research and development, made great progress in product stability and new product development, and the gap with foreign developed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46B22F1/00B22F3/16B22F5/00
Inventor 戴赫汪礼敏王磊张景怀王立根付东兴张敬国刘祥庆张斌
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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