High-strength high-toughness antioxidant metal-based self-lubricating composite and preparation method thereof

A composite material, high-strength and high-toughness technology, applied 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, achieve good tribological properties, and improve alloy strength , the effect of good high temperature sintering performance

Active Publication Date: 2021-02-05
NORTHEASTERN UNIV
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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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  • High-strength high-toughness antioxidant metal-based self-lubricating composite and preparation method thereof
  • High-strength high-toughness antioxidant metal-based self-lubricating composite and preparation method thereof

Examples

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-lubrication and composite materials, in particular to a high-strength high-toughness antioxidant metal-based self-lubricating composite anda preparation method thereof. The high-strength high-toughness antioxidant metal-based self-lubricating composite is jointly composed of cobalt alloy serving as a matrix, silver serving as a low-temperature self-lubricating phase and partially-oxidized elemental cobalt or cobalt alloy nano-particles, and the composite is prepared through spark plasma sintering, wherein the cobalt alloy accounts for 70%-85% by weight, the silver accounts for 8%-15% by weight, and the nano-particles account for 6%-20% by weight. By adding nano-cobalt or cobalt alloy particles, the high-temperature strength of the alloy is improved, a compact enamel layer with a self-lubricating function is formed through induction during high-temperature frictional wear, and the defect that the toughness of the composite islowered by adding self-lubricating ceramic phases such as fluoride, boron nitride and molybdenum disulfide in a traditional method is overcome; The composite material has comprehensive properties of high strength, high toughness, oxidation resistance and high-temperature self-lubrication, and can be used for production of oxidation-resistant and high-temperature-resistant motion and transmission parts under 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 Applications(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
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