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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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 gradu

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

Example Embodiment

[0035] Example 1

[0036] 1) Simply mix 48.75g of nano-copper oxide powder and 1.25g of nano-alumina powder, 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 the cemented carbide ball mill tank.

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

[0039] 4) The material after ball milling is used as the precursor powder. Put the precursor powder into a quartz tube furnace, evacuate to 15 Pa, and then pass the reducing gas CO after the temperature is raised to 100°C to reduce the precursor powder once. After holding for 120 minutes, it is cooled to room temperature along with the furnace to obtain copper powder and The alumina particles are all nano-scale first-class copper-based composite powders;

[0040]...

Example Embodiment

[0044] Example 2

[0045] The preparation method is basically the same as that of Example 1, except that:

[0046] Step 1) is a mixed powder of 49.49g nanometer copper oxide powder and 0.51g nanometer silicon carbide powder, and nanometer silicon carbide powder accounts for 2% of the total volume of the mixed powder;

[0047] Step 3) The revolution speed of one ball mill is 250r / min, and the ball milling time is 4h;

[0048] In step 4), the primary reduction temperature is 120℃, and the reduction holding time is 70min.

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

Example Embodiment

[0050] Example 3

[0051] The preparation method is basically the same as that of Example 1, except that:

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

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

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