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Nanoparticle reinforced metal-based composite material and preparation method thereof

A nanoparticle and composite material technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of long milling time, affecting the performance of composite materials, and low nanoparticle embedding rate

Active Publication Date: 2021-05-28
CISDI ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the continuous hardening of the flake powder, as the nanoparticles are embedded in the metal matrix, most of the flake powder has been broken before reaching the maximum diameter-thickness ratio, and the continuous ball milling can no longer continue to flake, resulting in most of the nanoparticles being uneven. Dispersed embedded in the flake powder, in the subsequent pressing and sintering process, the nanoparticles are seriously agglomerated, which seriously affects the performance of the composite material
[0006] Second, the ball milling time is long, the ball milling efficiency is low, and the energy consumption is high
[0007] Third, a large number of nanoparticles are deintercalated, and the actual mosaic rate of nanoparticles is very low
The deintercalated nanoparticles will quickly agglomerate and grow up in the subsequent curing and sintering process, which seriously affects the mechanical properties of the composite material

Method used

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  • Nanoparticle reinforced metal-based composite material and preparation method thereof
  • Nanoparticle reinforced metal-based composite material and preparation method thereof
  • Nanoparticle reinforced metal-based composite material and preparation method thereof

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preparation example Construction

[0053] The preparation method of the nanoparticle-reinforced metal matrix composite provided by the invention comprises the following steps:

[0054] (1) Surface modification and pre-dispersion of nanoparticles:

[0055] The nanoparticles are subjected to surface modification treatment. After modification, the modified nanoparticles, metal powder and ball milling aid are mixed and then fully ultrasonicated in the ball milling medium to remove impurities on the surface of the nanoparticles and fully disperse the agglomerated nanoparticles;

[0056] (2) Initial stage of ball milling:

[0057] Add the mixture obtained in step (1) into the ball milling tank, then add ball milling media and ball milling aids, and perform low-speed ball milling, the ball mill speed is 10-250r / min, so that the materials in the ball milling tank are evenly mixed;

[0058] (3) Middle stage of ball milling:

[0059] Increase the rotational speed of the ball mill to 20-560r / min, and continue the ball m...

Embodiment 1

[0080] A kind of nano-SiC particle reinforced iron-based composite material, its preparation method comprises the steps:

[0081] (1) Surface modification and pre-dispersion of nanoparticles:

[0082] Select spherical nano-SiC particle powder with a particle size of 100nm, dry the nano-powder at 80°C for 1-2h, and then bake at 500°C for 2h to obtain modified nano-SiC. Weigh the modified nano-SiC and ultrafine iron powder with a mass ratio of 1:5, add 0.5wt% stearic acid, mix and sonicate in absolute ethanol for 0.5h.

[0083] (2) Initial stage of ball milling:

[0084] Put the mixture prepared in step (1) into the ball milling tank, add appropriate amount of absolute ethanol and stearic acid, and carry out ball milling, the ball-to-material ratio is 10:1, the ball mill speed is 80rpm, ball milling for 2 hours, and the material in the ball milling tank Mix well.

[0085] (3) Middle stage of ball milling:

[0086] Subsequently, the rotating speed of the ball mill was increas...

Embodiment 2

[0093] A nano-Al 2 o 3 Particle-reinforced nickel-based composite material, its preparation method comprises the steps:

[0094] (1) Surface modification and pre-dispersion of nanoparticles:

[0095] Select spherical nano-Al with a particle size of 30nm 2 o 3 Granular powder, dry the nano-powder at 100°C for 1h, and then bake it at 800°C for 0.5h to obtain the modified nano-Al 2 o 3 . Weigh the modified nano-Al with a mass ratio of 1:99 2 o 3 and ultra-fine nickel powder, and then add 0.5wt% stearic acid, mix and ultrasonicate in absolute ethanol for 1h.

[0096] (2) Initial stage of ball milling:

[0097] Put the mixture prepared in step (1) into the ball milling tank, add appropriate amount of absolute ethanol and Tween 80, and carry out ball milling. The materials are sufficient.

[0098] (3) Middle stage of ball milling:

[0099] Subsequently, the rotational speed of the ball mill was increased to 560r / min, and after ball milling for 12 hours, the material was ...

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Abstract

The invention belongs to the technical field of composite materials, and discloses a nanoparticle reinforced metal-based composite material and a preparation method thereof. The method comprises the steps that firstly, surface modification and pre-dispersion are carried out on nanoparticles, so that the nanoparticles are in a relatively dispersed state before ball milling; low-speed ball milling in the initial stage of ball milling is carried out, and materials are fully mixed evenly; in the middle stage of ball milling, metal powder flaking and nanoparticle embedding mechanisms are combined, the work hardening phenomenon of flaky metal powder is reduced and eliminated through stress relief annealing, and the problems that nanoparticles are disembedded on the surface of the flaky metal powder and the load is small are solved; and finally, the rotating speed is reduced, the flaky powder with the large radius-thickness ratio is mechanically crushed through grinding balls, and then fine-scale-shaped nanoparticle reinforced metal-based composite powder is obtained through pressing, sintering and densification treatment. Through the steps of surface modification, pre-dispersion treatment, stress relief annealing added in the ball milling process and the like, the problem of work hardening of the metal powder is effectively solved, nanoparticles are dispersed more uniformly, and the loading capacity is higher.

Description

technical field [0001] The invention relates to the fields of powder metallurgy and metal-matrix composite material preparation, in particular to a nanoparticle-reinforced metal-matrix composite material and a preparation method thereof. Background technique [0002] With the development of aerospace, automobile industry, equipment manufacturing and other industries, traditional metal materials can no longer meet the requirements of some harsh service environments. For example, in some working conditions, metal materials are required to improve strength, toughness, specific stiffness, fatigue, and wear resistance at the same time, and may also increase specific strength while reducing thermal expansion coefficient, or have excellent dimensions during long-term service stability. Particle-reinforced metal matrix composites, especially when nanoparticles are used as reinforcements, can effectively meet the above requirements, so they have broad application prospects. [0003...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F1/00B22F1/02C22C33/02C22C38/02C22C1/05C22C1/10C22C19/03C22C21/02
CPCB22F9/04C22C33/0292C22C1/05C22C19/03C22C38/001C22C38/002C22C33/0264C22C21/02C22C38/02B22F2009/043B22F1/068B22F1/142B22F1/16
Inventor 张芝民朱科冯科徐诗鑫白书霞
Owner CISDI ENG CO LTD
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