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Method for preparing nanometer ceramic particle dispersion enhancing copper-based composite material through multi-step ball milling and multi-step gas phase reduction

A technology of nano-ceramic particles and dispersion-strengthened copper, which is applied in the field of copper-based composite materials, can solve the problems of low volume fraction of strengthening phase, uniform distribution of unfavorable strengthening phase, and increased difficulty in process control, and achieve excellent comprehensive performance.

Active Publication Date: 2019-01-04
JIANGXI UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In the above-mentioned in-situ synthesis method for preparing copper-based composites, the volume fraction of the strengthening phase is generally low, and with the increase of the volume fraction of the strengthening phase, the difficulty of process control will gradually increase, and local coarsening of the strengthening phase generated in situ is prone to occur. phenomenon, which is not conducive to the uniform distribution of the strengthening phase in the matrix, and ultimately affects the performance stability of the product

Method used

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  • Method for preparing nanometer ceramic particle dispersion enhancing copper-based composite material through multi-step ball milling and multi-step gas phase reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Simply mix 48.75g of nano-copper oxide powder with 1.25g of nano-alumina powder, and the nano-alumina powder accounts for 4% of the total volume of the mixed powder;

[0037] 2) Put the above mixed powder, cemented carbide balls, ball-to-material ratio of 20:1 and 50mL of absolute ethanol into a cemented carbide ball mill jar.

[0038] 3) Put the ball mill jar into the planetary ball mill, and perform the first high-energy ball mill with the ball mill revolution speed 300r / min and the ball mill time 2h;

[0039] 4) The ball-milled material is used as the precursor powder. Put the precursor powder into a quartz tube furnace, evacuate to 15Pa, heat up to 100°C, and then introduce reducing gas CO to reduce the precursor powder once. After 120 minutes of heat preservation, cool to room temperature with the furnace to obtain copper powder and Alumina particles are nano-scale primary copper-based composite powder;

[0040] 5) The primary copper-based composite powder in ...

Embodiment 2

[0045] The preparation method is basically the same as in Example 1, the difference is:

[0046] In step 1), it is a mixed powder of 49.49g nano-copper oxide powder and 0.51g nano-silicon carbide powder, and the nano-silicon carbide powder accounts for 2% of the total volume of the mixed powder;

[0047] In step 3), the revolution speed of the first ball mill is 250r / min, and the ball milling time is 4h;

[0048] In step 4), the primary reduction temperature is 120°C, and the reduction holding time is 70 minutes.

[0049] After spark plasma sintering, a copper-based composite material with a nano-silicon carbide volume fraction of 3.5% was obtained. The measured microhardness was HV146, the compressive yield strength was 426MPa, the maximum compressive strength was 580MPa, the compressibility was 48%, and the electrical conductivity at room temperature was 72% IACS.

Embodiment 3

[0051] The preparation method is basically the same as in Example 1, the difference is:

[0052] In step 1), it is a mixed powder of 47.59g nano-copper oxide powder and 2.41g nano-yttrium oxide powder, and the nano-yttrium oxide powder accounts for 6% of the total volume of the mixed powder;

[0053] In step 3), the revolution speed of the primary ball mill is 200r / min, the ball milling time is 6h, and the ball-to-material ratio is 15:1.

[0054] After spark plasma sintering, a copper-based composite material with a volume fraction of nanometer yttrium oxide of 10.2% was obtained. The measured microhardness was HV209, the compressive yield strength was 655MPa, the maximum compressive strength was 932MPa, the compressibility was 33.2%, and the electrical conductivity at room temperature was 55% IACS.

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Abstract

The invention discloses a method for preparing a nanometer ceramic particle dispersion enhancing copper-based composite material through multi-step ball milling and multi-step gas phase reduction. Dispersed distribution of nanometer ceramic particles in an ultrafine grain copper matrix can be realized by a multi-step ball milling and multi-step gas phase reduction as well as discharging plasma sintering technology combined mode and a reasonable control process. The method is a brand new copper-based composite material preparation method; the problem that uniform dispersion of a nanometer enhancing phase in the matrix cannot be realized effectively in the process of directly adding nanometer enhancing phase particles and mixing with copper powder can be solved; the ceramic particle dispersion enhancing copper-based composite material with excellent mechanical property and high electric conductivity can be obtained.

Description

technical field [0001] The invention relates to the technical field of copper-based composite materials, in particular to a multi-step ball milling and multi-step gas phase reduction combination to prepare nano-ceramic particle dispersion-strengthened ultra-fine-grained copper-based composite materials, and a preparation method for the material. Background technique [0002] Particle dispersion strengthened copper-based composite material is a method of artificial design and synthesis, which combines the excellent electrical and thermal conductivity of copper with the strengthening phase particles with high hardness, high strength, high wear resistance and high temperature thermal stability. , to prepare high-performance materials that can meet different engineering needs. However, how to effectively realize the excellent combination of properties between copper and strengthening phase particles has always been one of the difficulties in research. One of the important influ...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C9/00C22C32/00
CPCC22C1/05C22C9/00C22C32/0021C22C32/0063
Inventor 黄斐杨斌汪航
Owner JIANGXI UNIV OF SCI & TECH
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