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A hybrid reinforced copper-based composite material and its preparation method

A technology of copper-based composite materials and composite materials, which is applied in the field of copper-based composite materials, can solve the problems of destroying the intrinsic structure of CNTs, reducing the reinforcement effect, and damaging the conductivity of the matrix, so as to achieve good conductivity, increase strength, and improve toughness. Effect

Inactive Publication Date: 2020-11-17
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, high-energy ball milling will introduce more defects in the copper matrix, which will cause irreversible damage to the conductivity of the matrix; on the other hand, it will also destroy the intrinsic structure of CNTs, resulting in a significant reduction in its reinforcement

Method used

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  • A hybrid reinforced copper-based composite material and its preparation method
  • A hybrid reinforced copper-based composite material and its preparation method
  • A hybrid reinforced copper-based composite material and its preparation method

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preparation example Construction

[0029] The above-mentioned preparation method of a hybrid reinforced copper-based composite material, such as figure 1 As shown, the specific steps are as follows:

[0030] Step 1, prepare TiH 2 -B 4 C / Cu composite powder:

[0031] First, according to the in situ reaction to generate TiB in composites 2 Cu powder, TiH 2 powder, B 4 C powder, these three powders were mixed by ball milling to obtain TiH 2 -B 4 C / Cu composite powder.

[0032] The parameters of the ball milling process are: the ball milling time is 6-10 hours, the ball-to-material ratio is 10:1-20:1, the rotation speed is 300-400rpm, and the addition amount of the process control agent (absolute ethanol) is 6-10% of the total powder mass. The protective atmosphere is Ar.

[0033] Step 2, pretreatment of CNTs dispersion:

[0034] According to the CNTs content in the composite material is 0.05 ~ 0.25wt%, measure the CNTs dispersion liquid, add deionized water to dilute to obtain a suspension with a CNTs co...

Embodiment 1

[0045] Formation of TiB by in situ reaction in composites according to 2 : 0.5wt%, TiC: 0.22wt% target content Weigh Cu powder, TiH 2 powder, B 4 C powder. These three kinds of powders are then added into a stainless steel ball mill jar for ball milling. The ball milling process adopts: the ball-to-material ratio is 10:1, the ball milling time is 6h, the rotation speed is 350rpm, the protective atmosphere is Ar, the process control agent is absolute ethanol, and the addition amount is 6% of the total powder mass.

[0046] Measure the CNTs dispersion according to the CNTs content of 0.25wt% in the composite material, and add deionized water to dilute to obtain a CNTs suspension with a CNTs concentration of 0.73mg / ml; then ultrasonically vibrate the CNTs suspension, and the ultrasonic process adopts a power of 60W , time 140min.

[0047] TiH 2 -B 4 C / Cu composite powder and CNTs suspension were mixed and stirred according to the ratio of 0.29g / ml, and the stirring was stop...

Embodiment 2

[0050] Formation of TiB by in situ reaction in composites according to 2 : 2.5wt%, TiC: the target content of 1.08wt% Weigh Cu powder, TiH 2 powder, B 4 C powder. These three kinds of powders are then added into a stainless steel ball mill jar for ball milling. The ball milling process adopts: the ball-to-material ratio is 18:1, the ball milling time is 10 h, the rotation speed is 370 rpm, the protective atmosphere is Ar, the process control agent is absolute ethanol, and the addition amount is 10% of the total powder mass.

[0051] Measure the CNTs dispersion according to the CNTs content of 0.05wt% in the composite material, and add deionized water to dilute to obtain a CNTs suspension with a CNTs concentration of 0.22 mg / ml; then ultrasonically oscillate the CNTs suspension, and the ultrasonic process adopts a power of 40W , time 60min.

[0052] TiH 2 -B 4 C / Cu composite powder and CNTs suspension were mixed and stirred according to the ratio of 0.44g / ml, and the stir...

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Abstract

The invention discloses a hybrid reinforced copper-based composite. The hybrid reinforced copper-based composite comprises three reinforcements: CNTs, TiB2 and TiC, wherein in a composite structure, CNTs is distributed in a layered manner, TiB2 and TiC are distributed in a copper matrix in a dispersed manner, and a compound structure synergistically reinforced by the three reinforcements is formed. The invention further discloses a preparation method of the composite. According to the hybrid reinforced copper-based composite and the preparation method, TiB2 and TiC particles which are small insize and are uniformly distributed are introduced into the copper matrix among CNTs layers, resistance of dislocation motion during the material deformation process is increased, resistance and the reinforcement function of CNTs are mutually supplemented, and strength of the material is improved; in the composite structure, the three reinforcements form a synergetic enhancement structure which isalternately distributed and complements each other's advantages, and the composite has high hardness and good electric conductivity; and CNTs is distributed in layers of which the orientation is consistent, and the functions that CNTs shares load of the matrix and toughness of the composite is improved are exerted.

Description

technical field [0001] The invention belongs to the technical field of copper-based composite materials, and in particular relates to a hybrid reinforced copper-based composite material, and also relates to a preparation method of the hybrid reinforced copper-based composite material. Background technique [0002] The rapid development of the power electronics industry puts forward an urgent requirement for the development of high-performance copper matrix composites. Using powder metallurgy technology to introduce multiple reinforcements into the copper matrix to achieve a synergistic reinforcement effect is a new way to obtain high-performance copper-based composites. TiB 2 The strength of Cu-based composites can be significantly improved due to the high hardness and high elastic modulus of the TiC ceramic phase; and the addition of high-strength CNTs to the copper matrix can improve the toughness of the composite. Usually, the preparation of copper-based composites by p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C26/00C22C1/10C22C1/05
CPCC22C1/0425C22C1/05C22C9/00C22C26/00C22C2026/002
Inventor 肖鹏高镧星姜伊辉梁淑华邹军涛
Owner XIAN UNIV OF TECH