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A kind of preparation method of cu wrapping w composite powder

A composite powder, multi-phase mixing technology, used in transportation and packaging, metal processing equipment, coatings, etc., can solve the problems of reducing agent pollution, complex chemical copper plating process, etc., and achieve low preparation cost and good pressing performance. , the effect of uniform distribution

Active Publication Date: 2018-03-09
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electroless copper plating process is complicated, and the reducing agent used has serious pollution to the environment.

Method used

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  • A kind of preparation method of cu wrapping w composite powder
  • A kind of preparation method of cu wrapping w composite powder
  • A kind of preparation method of cu wrapping w composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, this example prepares Cu-wrapped W composite powder according to the following steps:

[0033] Dissolve 7.56g copper nitrate trihydrate in 100mL deionized water, according to Cu 2+ and NH 3 Add ammonia water with a concentration of 25% at a molar ratio of 1:8 to form an aqueous copper ammonia complex solution. Weigh 20 g of W powder with an average particle size of about 0.8 μm and add it to the cupro-ammonia complex aqueous solution to prepare a 500 mL multiphase mixed solution. The multi-phase mixed solution is placed in an ultrasonic cleaner and dispersed under the joint action of ultrasonic waves and electric agitation, wherein the ultrasonic dispersion frequency is 40KHz, the power is 300-400W, and the rotational speed of electric agitation is 300-400r / min. At the same time, heat to 80°C to distill ammonia until the pH of the mixture drops to neutral, and the reaction ends.

[0034] The precipitate was washed with deionized water seve...

Embodiment 2

[0039] Such as figure 1 As shown, this example prepares Cu-wrapped W composite powder according to the following steps:

[0040] Dissolve 7.81g copper sulfate pentahydrate in 100mL deionized water, according to Cu 2+ and NH 3 Add ammonia water with a concentration of 25% at a molar ratio of 1:8 to form an aqueous copper ammonia complex solution. Weigh 20 g of W powder with an average particle size of about 0.5 μm and add it to the cuproammonia complex aqueous solution to prepare a 500 mL multiphase mixed solution. The multi-phase mixed solution is placed in an ultrasonic cleaner, and dispersed under the joint action of ultrasonic waves and electric stirring, wherein the ultrasonic dispersion frequency is 40KHz, the power is 300-400W, and the rotational speed of electric stirring dispersion is 300-400r / min. At the same time, heat to 80°C to distill ammonia until the pH of the mixture drops to neutral, and the reaction ends. The precipitate was washed with deionized water se...

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Abstract

The invention discloses a preparation method of Cu-wrapped W composite powder, which uses W powder and soluble copper salt as raw materials, dissolves the copper salt in water, and adds ammonia water to prepare an aqueous copper ammonia complex solution; then adds W powder to form A multi-phase mixed solution in which W powder is in suspension; the mixed solution is dispersed under the joint action of electric stirring and ultrasonic waves, and heated to 70-80°C for ammonia reduction, centrifugal precipitation, washing and drying, and finally Cu-coated W is obtained Composite powder. The preparation method of the Cu-coated W composite powder of the present invention does not require the reduction process of tungsten-copper oxide in the conventional preparation method, the preparation process is simplified, and the preparation cost is low. The obtained coating powder has a core-shell structure, W-Cu composition The powder is evenly distributed; and the powder has good compaction properties, which is conducive to the preparation of high-performance W-Cu composite materials with uniform components.

Description

technical field [0001] The invention belongs to the field of powder material preparation, and in particular relates to a preparation method of Cu-wrapped W composite powder. Background technique [0002] W-Cu composite material is a pseudo-alloy composed of two immiscible metal phases. Therefore, the composite material combines the high melting point, high hardness, low linear expansion coefficient of tungsten and the high electrical conductivity and high thermal conductivity of copper, and is widely used as a function and structure of electrical contactors, vacuum circuit breakers, heat sink materials, etc. device. At present, the preparation of W-Cu composite materials mainly relies on infiltration method and high temperature liquid phase sintering method. Due to the high hardness and poor formability of tungsten powder, it is difficult to obtain the skeletal density required for high-tungsten-content W-Cu materials at general high temperatures, and it is difficult to pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24
CPCB22F9/24B22F1/17
Inventor 程继贵陈会培陈闻超魏邦争罗雪婷罗来马
Owner HEFEI UNIV OF TECH