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Silicon carbide particle reinforced iron-based composite material and preparation method thereof

A technology of iron-based composite materials and silicon carbide particles, which is applied in the field of powder metallurgy materials, can solve the problems of reducing material hardness, reducing hard particles, and peeling off hard particles, and achieves the effect of improving mechanical properties, hardness and strength.

Inactive Publication Date: 2017-01-25
重庆华孚新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the difference in physical and chemical properties between the matrix and the hard particles is too large, the hard particles will peel off; and if the sintering temperature is too high, the diffusion of alloy elements in the hard particles into the matrix will increase, resulting in hard particles. The reduction of hard particles will also cause changes in the hardness of the matrix, the hardness of the hard phase, and the interface between the matrix and hard particles.
For example: when the hard phase contains elements such as Mo and W, it will react with C in the matrix at high temperature to form M6C carbides, which reduces the hardness of the material.

Method used

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  • Silicon carbide particle reinforced iron-based composite material and preparation method thereof
  • Silicon carbide particle reinforced iron-based composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Silicon carbide particle reinforced iron-based composite material, the composition and the mass percentage of each composition are: Al 1.0%, Mo3.5%, Cu 1.0%, Sn 0.1%, Cr 10.0%, Mg 2.4%, SiC 1.2%, Si 1.0%, B 0.05%, the balance is Fe.

[0022] The preparation method comprises the steps of:

[0023] 1) Mixing: Mix Cu, Si and Fe as the matrix layer, and mix the rest of the components as the alloy layer; mix the alloy layer powder and the matrix layer powder at a ratio of 1:3, and finally add the remaining matrix layer powder; Carry out in the mixer, the rotating speed is 40rpm, and the mixing time is 55min;

[0024] 2) The mixture of step 1) is added to a hydraulic press for compression molding, and the compression pressure is 650MPa;

[0025] 3) Sinter the sample pressed in step 2) in a sintering furnace. The preheating temperature is 550°C, the sintering temperature is 1250°C, and the sintering time at high temperature is 20 minutes, then keep it at 900°C for 45 minutes...

Embodiment 2

[0027] Silicon carbide particle reinforced iron-based composite material, the composition and the mass percentage of each composition are: Al 5.8%, Mo7.5%, Cu 3.5%, Sn 1.6%, Cr 22.6%, Mg 4.8%, SiC 1.6%, Si 1.5%, B 0.15%, and the balance is Fe.

[0028] The preparation method comprises the steps of:

[0029] 1) Mixing: Mix Cu, Si and Fe as the matrix layer, and mix the rest of the components as the alloy layer; mix the alloy layer powder and the matrix layer powder at a ratio of 1:3, and finally add the remaining matrix layer powder; Carry out in the mixer, the rotating speed is 40rpm, and the mixing time is 55min;

[0030] 2) The mixture of step 1) is added to a hydraulic press for compression molding, and the compression pressure is 650MPa;

[0031] 3) Sinter the sample pressed in step 2) in a sintering furnace. The preheating temperature is 550°C, the sintering temperature is 1250°C, and the sintering time at high temperature is 20 minutes. Then keep it at 900°C for 45 min...

Embodiment 3

[0033] Silicon carbide particle reinforced iron-based composite material, the mass percentage of each component is: Al 3.0%, Mo 5%, Cu 1.5%, Sn 1%, Cr 15.0%, Mg 1.9%, SiC 1.3%, Si 1.25% , B 0.12%, the balance is Fe.

[0034] The preparation method comprises the steps of:

[0035] 1) Mixing: Mix Cu, Si and Fe as the matrix layer, and mix the rest of the components as the alloy layer; mix the alloy layer powder and the matrix layer powder at a ratio of 1:3, and finally add the remaining matrix layer powder; Carry out in the mixer, the rotating speed is 40rpm, and the mixing time is 55min;

[0036] 2) The mixture of step 1) is added to a hydraulic press for compression molding, and the compression pressure is 650MPa;

[0037] 3) Sinter the sample pressed in step 2) in a sintering furnace. The preheating temperature is 550°C, the sintering temperature is 1250°C, and the sintering time at high temperature is 20 minutes. Then keep it at 900°C for 45 minutes, and quench it with wat...

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Abstract

The invention discloses a silicon-carbide-particle-reinforced iron-base composite material and a preparation method thereof. The silicon-carbide-particle-reinforced iron-base composite material comprises the following components in percentage by mass: 3.4-3.6% of C, 1.9-2.1% of Si, 0.3-0.5% of Mn, 0.5-0.8% of Cr, 0.1-0.2% of Ti, 0.05-0.1% of Te, 0.03-0.05% of Mg, 0.01-0.03% of Re, at most 0.05% of P, at most 0.02% of S and the balance of Fe. The silicon carbide particles, which are used as the main hard phase, can be well combined with the base to effectively enhance the mechanical properties of the material subjected to sintering and quenching; after the alloy is subjected to quenching-tempering heat treatment, the hardness and strength of the alloy are greatly enhanced; and after the alloy sintered at 1250 DEG C is subjected to quenching-tempering heat treatment, the maximum hardness and tensile strength can reach 45.4 HRC and 1859 MPa.

Description

technical field [0001] The invention relates to a silicon carbide particle-reinforced iron-based composite material and a preparation method thereof, belonging to the technical field of powder metallurgy materials. Background technique [0002] Iron-based powder metallurgy materials are made of mixed powders of Fe, graphite, Cu, Ni, Co and other alloying elements through pressing and sintering, and are one of the most important powder metallurgy materials. In recent years, with the rapid development of automobile and other industries, iron-based powder metallurgy materials have become the largest and most widely used materials. The manufacturing technology and production of iron-based powder metallurgy materials have also been developed rapidly, which greatly broadens the application range of iron-based powder metallurgy machinery parts. At present, iron-based powder metallurgy materials are widely used in vehicles, household appliances, power tools and office machinery. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/34C22C33/02C21D6/00
Inventor 左刚锋
Owner 重庆华孚新材料技术有限公司