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A kind of heavy-duty engine powder metallurgy valve seat material and preparation method thereof

A powder metallurgy and engine technology, applied in the field of powder metallurgy valve seat materials for heavy-duty engines and their preparation, can solve problems such as poor wear resistance, and achieve the effects of improving wear resistance, avoiding spalling, and increasing costs

Active Publication Date: 2021-03-16
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of poor wear resistance in the prior art, to provide a heavy-duty engine powder metallurgy valve seat material and its preparation method that can significantly improve wear resistance

Method used

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  • A kind of heavy-duty engine powder metallurgy valve seat material and preparation method thereof
  • A kind of heavy-duty engine powder metallurgy valve seat material and preparation method thereof
  • A kind of heavy-duty engine powder metallurgy valve seat material and preparation method thereof

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preparation example Construction

[0039] A method for preparing a powder metallurgy valve seat material for a heavy-duty engine comprises the following steps in sequence:

[0040] 1. First mix the FeMoSiMn metal alloy powder, solid lubricant and matrix forming powder in proportion, and then press the mixed powder into a green body;

[0041] 2. First sinter the green body and carry out infiltration copper treatment in the form of a copper billet, and then perform tempering treatment and cryogenic treatment in sequence.

[0042] In step 1, the mixing time is 1-2 hours, and the density of the green body is 6.6-7.0 g / cm 3 ;

[0043] In step 2, the sintering temperature is 1100-1200°C, and the tempering temperature is 400-600°C.

[0044] Composition and effect of material of the present invention are as follows:

[0045] In the present invention, a large amount of FeMoSiMn metal alloy powder is added to the powder formed by the iron matrix, and the fine powder and coarse powder are added in a certain proportion,...

Embodiment 1

[0059] A heavy-duty engine powder metallurgy valve seat material, its raw material composition and mass percentage content are: FeMoSiMn metal alloy powder 30, CaF 2 0.8, MoS 2 0.6, MnS 0.4, micro-wax powder 0.6, and the rest are high-speed steel powder. Wherein, the FeMoSiMn metal alloy powder is composed of fine powder particles with a particle size of 20-50um and coarse powder particles with a particle size of 50-100um, and the mass percentage of the fine powder particles is 40, and the iron matrix forming powder is composed of The fine powder particles with a particle size of 20-50um and the coarse powder particles with a particle size of 50-80um are composed, and the mass percentage content of the fine powder particles is 60, and the raw material composition and weight percentage content of the FeMoSiMn metal alloy powder are Si 10 , Mo 50, Mn 4, V 1, W 2, Ni0.5, Cu 1, and the rest are Fe and unavoidable impurities.

[0060] A method for preparing a heavy-duty engine ...

Embodiment 2

[0065] The difference with Example 1 is:

[0066] The raw material composition and mass percentage content of the material are: FeMoSiMn metal alloy powder 40, MoS 2 1. MnS0.4, graphite powder 0.8, microwax powder 0.6, chromium-containing steel powder 6, and the rest are high-speed steel powder. The raw material composition and weight percent content of the FeMoSiMn metal alloy powder are Si 6, Mo 35, Mn 2, V 0.2, W 1.3, Ni 0.2, Cu 2.0, and the rest are Fe and unavoidable impurities.

[0067] In step 1, the mixing time is 2h;

[0068] In step 2, the sintering temperature is 1200°C, and the tempering temperature is 600°C.

[0069] The chemical composition and mass percentage content of the material prepared by this method are: Mo 12.84, Mn0.8, Co 0.07, W 2.8, V 0.8, Cr 1.9, Ni 0.1, Cu 18, Si 1.9, C 0.95, and the rest are Fe and unavoidable impurities.

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Abstract

A powder metallurgy valve seat material for a heavy-duty engine, its raw material composition and mass percentage content are: FeMoSiMn metal alloy powder 10-50, solid lubricant ≤ 5, machining aid ≤ 5, and the rest is matrix forming powder. The preparation method is as follows: The raw materials are mixed evenly in proportion, and then the mixed powder is pressed into a green body, and then the green body is sintered and copper infiltrated in the form of a copper billet, and finally tempered and cryogenically treated. The invention not only significantly improves the wear resistance of the material, but also does not bring about a substantial increase in cost.

Description

technical field [0001] The invention belongs to the field of alloy iron-based metallurgical materials, and in particular relates to a heavy-duty engine powder metallurgy valve seat material and a preparation method thereof, which are suitable for improving wear resistance, corrosion resistance and high temperature stability, and controlling costs. Background technique [0002] In the engine, a valve or valve system is provided to control the flow of fuel into the cylinder and the discharge of combusted exhaust gas from the cylinder. When the intake and exhaust valves are closed, the cylinder head is in an airtight state, and the sealing surface is the valve seat. The working conditions of the friction pair of the valve and the valve seat are complicated. On the one hand, the frequent opening and closing of the valve causes impact on the valve seat, and the rotation of the valve makes the valve and the valve seat have axial relative displacement. On the other hand, the inta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F3/26C22C38/44C22C38/04C22C38/58C22C38/52C22C38/46C22C38/42C22C38/02
CPCC22C38/02C22C38/04C22C38/34C22C38/42C22C38/44C22C38/46C22C38/52C22C38/58B22F3/26B22F2998/10B22F1/052B22F1/105B22F2003/248B22F3/10B22F3/02
Inventor 蔡星王健廖显敏郭文芳刘胜王砚民
Owner DONGFENG COMML VEHICLE CO LTD
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