Unlock instant, AI-driven research and patent intelligence for your innovation.

A low-temperature combustion synthesis method for preparing tungsten dispersion-strengthened copper ultrafine powder

A low-temperature combustion synthesis and dispersion-strengthened copper technology, which is applied in the field of low-temperature combustion synthesis to prepare tungsten dispersion-strengthened copper ultrafine powder, can solve the problems of difficult control of the reduction process, uneven distribution of oxides, narrow application range, etc., to avoid mechanical Alloying, good distribution uniformity, and the effect of improving the activity of powder sintering

Active Publication Date: 2019-12-31
UNIV OF SCI & TECH BEIJING
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent application 94112582.3 discloses a method for preparing dispersion-strengthened copper by mechanical alloying. The mechanical alloying method is simple and easy to implement, but impurities such as Fe and Cr are easily introduced by ball milling for a long time, which may lead to coarse grains.
Chinese invention patent application 201610360623.9 discloses a method for preparing alumina-dispersed copper by internal oxidation, but the internal oxidation reduction process is not easy to control, and incomplete oxygen diffusion may lead to uneven distribution of oxides, and internal oxidation can only prepare oxide Material dispersion strengthened copper, the application range is narrow
China's authorized patent CN 201560172B discloses a method for preparing oxide dispersion-strengthened copper by metal salt co-precipitation method. The prepared powder particles are fine and the dispersed phase is uniform, but the process is long and the output is low.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The raw material is 241g of copper nitrate trihydrate, 0.5g of ammonium tungstate is dissolved in 475ml of deionized water, 25ml of ethanol and 5ml of dispersant polyethylene glycol are added, and the dispersion solution is prepared after completely dissolving evenly. Add 60 g of combustion accelerant urea into the solution, and stir evenly. Put the combustible solution in a furnace and heat it to 200°C. The solution starts to spread and burn. After the combustion is complete, collect the fluffy powder and place it in a muffle furnace for calcination at 500°C for 1 hour to obtain copper-tungsten co-oxide powder. The co-oxide powder was reduced in a hydrogen atmosphere for 1 h at a temperature of 900° C. to obtain a tungsten dispersion-strengthened copper ultrafine powder with a W mass fraction of 0.5%.

Embodiment 2

[0020] The raw material is 243g of copper sulfate pentahydrate, 3g of ammonium paratungstate is dissolved in 400ml of deionized water, 100ml of ethanol and 5ml of dispersant polyethylene glycol are added, and the dispersion solution is prepared after completely dissolving evenly. Add combustion accelerant malic acid 230g in the solution, stir evenly. Put the combustible solution in a furnace and heat it to 250°C. The solution starts to spread and burn. After the combustion is complete, collect the fluffy powder and place it in a muffle furnace for calcination at 400°C for 2 hours to obtain copper-tungsten co-oxide powder. The co-oxide powder was reduced in a hydrogen atmosphere for 2 hours at a temperature of 800°C to obtain a tungsten dispersion-strengthened copper ultrafine powder with a W mass fraction of 3%.

Embodiment 3

[0022] The raw material is 161g of copper chloride dihydrate, 5g of ammonium metatungstate is dissolved in 250ml of deionized water, 250ml of ethanol and 5ml of dispersant polyethylene glycol are added, and the dispersion solution is prepared after completely dissolving evenly. Add 300 g of combustion accelerant isoniazid into the solution, and stir evenly. Put the combustible solution in a furnace and heat it to 250°C. The solution starts to spread and burn. After the combustion is complete, collect the fluffy powder and place it in a muffle furnace for calcination at 300°C for 4 hours to obtain copper-tungsten co-oxide powder. The co-oxide powder was reduced in a hydrogen atmosphere for 4 hours at a temperature of 650° C. to obtain a tungsten dispersion-strengthened copper ultrafine powder with a W mass fraction of 5%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for preparing tungsten dispersion strengthening copper ultrafine powder through low-temperature combustion synthesis, and belongs to the technical field of powder preparation and synthesis. Soluble copper salt and soluble tungstate are used as raw materials, and are dissolved in ethanol and water solution of an organic combustion improver for uniform mixing. Solution is heated for self-propagation combustion; and after combustion is finished, calcined co-oxide powder is reduced in a hydrogen atmosphere to obtain the tungsten dispersion strengthening copper ultrafine powder. The ion-grade mixing of reactants is realized through a solution system; tungsten dispersion strengthening particles are finer in size and excellent in distribution uniformity; and the finally obtained dispersion strengthening copper powder is fine in particle size (submicron), narrow in particle size distribution and excellent in performance. Compared with a traditional method, the method is short in preparation flow, low in energy consumption and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of powder preparation and synthesis, and particularly provides a method for preparing tungsten dispersion-strengthened copper ultrafine powder through low-temperature combustion synthesis. Background technique [0002] Dispersion strengthened copper material has the advantages of high strength (tensile strength greater than 600MPa), high softening temperature (greater than 600°C), good electrical conductivity and thermal conductivity, etc., so it is widely used in aerospace, electronic industry, electrical components and other fields, and has obtained good effect. The particle size of the dispersion-strengthened phase in dispersion-strengthened copper is extremely small (generally less than 50nm), and has no solid solubility in the copper matrix. It hinders dislocation migration through uniform dispersion in the matrix, thereby improving material performance. At present, most of the dispersed phases used in...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22C22C1/04C22C9/00
CPCB22F9/22C22C1/0425C22C9/00
Inventor 陈存广陆天行郭志猛郝俊杰杨芳纪庆竹李沛
Owner UNIV OF SCI & TECH BEIJING