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Preparation method of ultrafine WC-Ni composite powder

A composite powder and powder technology, applied in the field of preparation of ultra-fine WC-Ni composite powder, can solve the problems of uneven distribution of WC and Ni, lower overall performance of the alloy, difficulty in obtaining WC powder, etc., and achieve huge Rayleigh instability Good performance, composition and particle size, easy to grind and refine the effect

Active Publication Date: 2017-09-01
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This preparation method has the following disadvantages: (1) The complete carbonization temperature of W powder is above 1300 ° C, and the WC powder prepared at this temperature is usually coarse, and it is difficult to obtain ultra-fine WC powder; (2) due to the metal Ni With good ductility, Ni powder is prone to agglomeration during the ball milling process, resulting in uneven distribution of WC and Ni in the subsequent sintered bulk material, and local structural defects will seriously reduce the overall performance of the alloy; (3 ) The traditional preparation method has a long process flow, high energy consumption, and long-term ball milling is easy to introduce impurity elements

Method used

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  • Preparation method of ultrafine WC-Ni composite powder
  • Preparation method of ultrafine WC-Ni composite powder
  • Preparation method of ultrafine WC-Ni composite powder

Examples

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Effect test

Embodiment 1

[0017] Violet tungsten powder (morphology such as figure 1 a), nickel oxide powder (morphology such as figure 1 b) and carbon black powder (morphology such as figure 1 c) as raw materials, calculate the proportions of the above three raw materials according to the final preparation of WC-12wt.%Ni composite powder, and mix them. The raw material mixture is carried out vertical stirring and grinding, and the material of the grinding ball and the stirring rod is hard alloy, and the diameter of the grinding ball is 0.8mm, with absolute ethanol as the grinding medium, and the weight ratio of the weight of the grinding ball to the raw material powder is 6: 1. The rotation speed of the stirring shaft is 2000r / min, and the grinding time is 10 hours. The ground mixture was taken out and dried until the humidity of the mixture was 8wt.%, and then pressed into a cylindrical compact with a diameter of 30mm and a height of 30mm, and placed in a drying oven to fully dry. Place the dried ...

Embodiment 2

[0019] Using violet tungsten powder, nickel oxide powder and carbon black powder as raw materials, calculate the proportion of the above three raw materials according to the final preparation of WC-12wt.% Ni composite powder, and mix them. The raw material mixture is carried out vertical stirring and grinding, the material of the grinding ball and the stirring rod is hard alloy, the diameter of the grinding ball is 0.8mm, and absolute ethanol is used as the grinding medium, and the weight ratio of the weight of the grinding ball to the raw material powder is 8: 1. The rotation speed of the stirring shaft is 1750r / min, and the grinding time is 8 hours. The ground mixture was taken out and dried until the humidity of the mixture was 7wt.%, then pressed into a cylindrical compact with a diameter of 40mm and a height of 25mm, and placed in a drying oven to fully dry. Place the dried briquette in a vacuum furnace, raise the furnace temperature to 870°C at a heating rate of 6°C / min,...

Embodiment 3

[0021] Using violet tungsten powder, nickel oxide powder and carbon black powder as raw materials, calculate the proportion of the above three raw materials according to the final preparation of WC-12wt.% Ni composite powder, and mix them. The raw material mixture is carried out vertical stirring and grinding, the material of the grinding ball and the stirring rod is hard alloy, the diameter of the grinding ball is 0.8mm, and absolute ethanol is used as the grinding medium, and the weight ratio of the weight of the grinding ball to the raw material powder is 10: 1. The rotation speed of the stirring shaft is 1500r / min, and the grinding time is 6 hours. The ground mixture was taken out and dried until the humidity of the mixture was 7wt.%, and then pressed into a cylindrical compact with a diameter of 50mm and a height of 20mm, and placed in a drying oven to fully dry. Place the dried briquette in a vacuum furnace, raise the furnace temperature to 880°C at a heating rate of 7°C...

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Abstract

The invention discloses a preparation method of ultrafine WC-Ni composite powder and belongs to the technical field of preparation of hard alloy materials. Violet tungsten oxide, nickel oxide and carbon black are used as raw materials, a nanoscale initial mixture with all phases dispersed evenly is obtained through stirring, grinding and refining firstly and then is placed in a vacuum furnace for in-situ reduction and carbonization reaction, and the WC-Ni composite powder in the ultrafine particle size is synthetized in one step. The metal oxide is high in brittleness, the raw materials can be refined and evenly mixed through ball milling for a short time, and the energy barrier for production of WC through continuous carbonization of W produced through reduction of the violet tungsten oxide is effectively reduced through formation of an intermediate product W-Ni-C in the in-situ reaction process, so that the synthetic temperature of WC and Ni is substantially reduced. Thus, compared with a traditional method, the method has the advantages that the technological process is short, the cost is low, the dispersity of Ni in the prepared powder is good, and adjustment of the composition and the particle size of the powder is facilitated.

Description

technical field [0001] The invention belongs to the technical field of hard alloy material preparation, and in particular relates to a preparation method of superfine WC-Ni composite powder. Background technique [0002] Compared with traditional WC-Co cemented carbide, WC-Ni cemented carbide has slightly poorer mechanical properties (hardness, toughness and flexural strength, etc.), but has significantly superior corrosion resistance and oxidation resistance. Especially when serving in corrosive media, the service life of cemented carbide with Ni as the binder phase can be greatly improved compared with Co as the binder phase. Therefore, WC-Ni cemented carbide is widely used in the petrochemical field and mechanical seal devices facing high temperature, high pressure and corrosive working environment. [0003] It is an effective way to improve the mechanical properties of WC-Ni cemented carbide by refining the grains to ultrafine or nanometer scale. For this reason, WC-Ni...

Claims

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Application Information

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IPC IPC(8): B22F9/20C22C1/05
CPCB22F9/20C22C1/055
Inventor 王海滨宋晓艳占王彬刘雪梅侯超
Owner BEIJING UNIV OF TECH
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