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A kind of high-strength, high-toughness, oxidation-resistant metal-based self-lubricating composite material and preparation method thereof

A composite material, high strength and high toughness technology, used in metal processing equipment, transportation and packaging, etc., can solve the problems of self-lubricating composite materials that cannot resist oxidation, self-lubrication and high toughness, and achieve the effect of improving alloy strength.

Active Publication Date: 2021-11-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention proposes a high-strength, high-toughness anti-oxidation metal-based self-lubricating composite material and its preparation method, which solves the problem that self-lubricating composite materials in the prior art cannot fully combine anti-oxidation, self-lubricating and high toughness, It can be used in the production of anti-oxidation, high temperature resistance, and high load impact movement and transmission parts

Method used

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  • A kind of high-strength, high-toughness, oxidation-resistant metal-based self-lubricating composite material and preparation method thereof
  • A kind of high-strength, high-toughness, oxidation-resistant metal-based self-lubricating composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the cobalt-based superalloy Co-27Cr-8W (wt.%) is used as the alloy matrix with a particle size of 15-53 μm, and silver (particle size is about 40 μm), nano-cobalt particles (pre-oxidized at 600 ° C) 10min, the about 50nm of particle diameter) prepares this composite material, and its concrete preparation parameter is as follows:

[0035] (1) Powder mixing: The composite material is mixed according to the following composition ratio, cobalt-based alloy 80wt%, silver 10wt%, and nano-cobalt particles 10wt%, and mixed by planetary ball mill at a speed of 320 rpm for 24 hours to obtain a composite powder .

[0036] (3) Discharge plasma sintering: The composite powder mixed by ball mill is put into graphite mold, compacted, and sintered by discharge plasma system:

[0037] Vacuum degree: 1×10 -3 atm;

[0038] Sintering temperature: 1100°C;

[0039] Heating rate: 50°C / min, keep at the final sintering temperature for 15 minutes and then cool naturally; ...

Embodiment 2

[0056] In this embodiment, the cobalt-based superalloy Co-20Ni-17Cr-8W-8Mo (wt.%) is used as the alloy matrix with a particle size of 30-50 μm, and silver (with a particle size of about 40 μm), nano-cobalt chromium (CoCr ) alloy particles (pre-oxidized at 800°C for 10 minutes, the particle size is about 50nm) to prepare the composite material, and the specific preparation parameters are as follows:

[0057] (1) Powder mixing: the composite material is mixed according to the following composition ratio, cobalt-based superalloy 77wt%, silver 12wt%, nano-cobalt chromium particles 15wt%, through planetary ball mill ball milling, rotating speed 300 rpm, time 30 hours, obtained Composite powder.

[0058] (3) Discharge plasma sintering: The composite powder mixed by ball mill is put into graphite mold, compacted, and sintered by discharge plasma system:

[0059] Vacuum degree: 1×10 -3 atm;

[0060] Sintering temperature: 1200°C;

[0061] Heating rate: 55°C / min, keep at the final ...

Embodiment 3

[0065] In this example, the cobalt-containing high-entropy alloy (CoFeNiCr) is used as the matrix with a particle size of 30-50 μm, and silver (with a particle size of about 40 μm) and nano-cobalt-chromium particles (pre-oxidized at 900°C for 10 minutes, with a particle size of about 50nm) to prepare the composite material, its specific preparation parameters are as follows:

[0066] (1) Powder mixing: The composite material is composed of cobalt-containing high-entropy alloy (CoFeNiCr 0.5 ) 77wt%, silver 10wt%, and nanometer cobalt chromium (CoCr) particles 15wt%, were ball-milled and mixed by a planetary ball mill at a speed of 300 rpm for 40 hours to obtain a composite powder.

[0067] (3) Discharge plasma sintering: The composite powder mixed by ball mill is put into graphite mold, compacted, and sintered by discharge plasma system:

[0068] Vacuum degree: 1×10 -3 atm;

[0069] Sintering temperature: 1100°C;

[0070] Heating rate: 55°C / min, keep at the final sintering ...

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Abstract

The invention relates to the field of high-temperature self-lubricating and composite materials, in particular to a high-strength, high-toughness and anti-oxidation metal-based self-lubricating composite material and a preparation method thereof. The composite material is based on cobalt alloy, silver is a low-temperature self-lubricating phase, and partially oxidized It is composed of simple cobalt or cobalt alloy nanoparticles and prepared by spark plasma sintering. Wherein, according to the weight percentage, the cobalt alloy accounts for 70%-85%, the silver accounts for 8%-15%, and the nano particles accounts for 6-20%. The invention improves the high-temperature strength of the alloy through the addition of nano-cobalt or cobalt alloy particles, induces the formation of a dense enamel layer with self-lubricating function during high-temperature friction and wear, and avoids the addition of self-lubricating ceramics such as fluoride, boron nitride, and molybdenum disulfide in traditional methods. Compared with the disadvantage of reducing the toughness of the composite material, the composite material has the comprehensive properties of high strength, high toughness, oxidation resistance and high temperature self-lubrication, and can be used for the production of sports and transmission parts under oxidation resistance, high temperature resistance, and high load impact.

Description

technical field [0001] The invention relates to the field of high-temperature self-lubricating and composite materials, in particular to a high-strength, high-toughness, oxidation-resistant metal-based self-lubricating composite material and a preparation method thereof. Background technique [0002] With the rapid development of my country's national defense construction and national economy, in high-tech industries such as aviation, aerospace, deep sea and nuclear power, the multi-factor coupling caused by the increasingly harsh service environment has accelerated the damage of key component materials, especially in the power system. For high-temperature bearings and bushings and other transmission components that serve in high-temperature environments, the coordinated coupling of high-temperature corrosion and friction and wear, as the main failure mode of materials, has become a key factor affecting the reliability and life of the entire system. In view of this situation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/07C22C1/04B22F1/00B22F9/04B22F3/105
CPCC22C19/07C22C1/0433B22F9/04B22F3/105B22F2009/043B22F2304/05B22F1/142
Inventor 陈明辉王群昌王金龙周文王福会
Owner NORTHEASTERN UNIV LIAONING
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