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Preparation method of pure single-phase ternary carbide Co3W3C

A ternary carbide, pure technology, applied in the field of hard alloy material preparation, can solve the problems of difficult control of composition and process, difficult control of preparation process, difficult control of relative content, etc., to reduce cold welding phenomenon and increase screening efficiency , reduce the effect of volatilization

Active Publication Date: 2016-07-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) To form Co under high temperature conditions 3 W 3 After C, there is still a certain carbon content surplus, without making Co 3 W 3 C reacts with C to form carbides with higher carbon content, such as W 2 C, WC, etc., whose preparation process is difficult to control
(3) Difficult to control Co 3 W 3 The relative content of C and C
In summary, the current preparation of the cathode catalyst Co in PEMFC 3 W 3 C / C support materials, there are problems such as cumbersome preparation process, difficult to control the composition and process, and it is difficult to realize industrialization

Method used

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  • Preparation method of pure single-phase ternary carbide Co3W3C

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Experimental program
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Effect test

Embodiment 1

[0029] Take cobalt powder, 1.0um tungsten powder, and 0.6um carbon powder with an average particle size of 0.8um to prepare Co-W-C mixed powder, wherein the carbon content is 1.92wt%. Add the mixed powder, cemented carbide balls (4mm, 7mm, 9mm) of three different diameters, and absolute ethanol into the cemented carbide ball mill jar for intermittent ball milling. The weight ratio of cemented carbide balls to Co-W-C mixed powder is 3:1, the ball milling time is 24 hours, and the ball milling speed is 100r / min. Dry the mixed powder after ball milling, add absolute ethanol to cold press, the pressure is 6MPa, the compact is placed in a vacuum furnace for chemical reaction, the vacuum degree in the furnace is 0.03Pa, the heating rate is 6°C / min, and the reaction temperature is 1230°C , the holding time is 2 hours, and the pure single-phase ternary carbide Co can be obtained after rapid cooling 3 W 3 C powder green body, the powder green body is subjected to intermittent ball mi...

Embodiment 2

[0031] Take cobalt powder, 0.6um tungsten powder, and 0.5um carbon powder with an average particle size of 0.8um to prepare Co-W-C mixed powder, wherein the carbon content is 1.87wt%. Add the mixed powder, cemented carbide balls (4mm, 8mm, 10mm) of three different diameters, and absolute ethanol into the cemented carbide ball mill jar for intermittent ball milling. The weight ratio of cemented carbide balls to Co-W-C mixed powder is 2:1, the ball milling time is 30 hours, and the ball milling speed is 120r / min. Dry the mixed powder after ball milling, add absolute ethanol to cold press, the pressure is 5MPa, the compact is placed in a vacuum furnace for chemical reaction, the vacuum degree in the furnace is 0.04Pa, the heating rate is 5°C / min, and the reaction temperature is 1270°C , the holding time is 1 hour, and the pure single-phase ternary carbide Co can be obtained after rapid cooling 3 W 3 C powder green body, the powder green body is subjected to intermittent ball mi...

Embodiment 3

[0033] Take cobalt powder, 0.8um tungsten powder, and 0.6um carbon powder with an average particle size of 1.0um to prepare Co-W-C mixed powder, wherein the carbon content is 1.81wt%. Add the mixed powder, cemented carbide balls (3mm, 8mm, 10mm) of three different diameters, and absolute ethanol into the cemented carbide ball mill jar for intermittent ball milling. The weight ratio of cemented carbide balls to Co-W-C mixed powder is 3:1, the ball milling time is 30 hours, and the ball milling speed is 80r / min. Dry the mixed powder after ball milling, add absolute ethanol and cold press, the pressure is 6MPa, the compact is placed in a vacuum furnace for chemical reaction, the vacuum degree in the furnace is 0.04Pa, the heating rate is 4°C / min, and the reaction temperature is 1300°C , the holding time is 2 hours, and the pure single-phase ternary carbide Co can be obtained after rapid cooling 3 W 3 C powder green body, the powder green body is subjected to intermittent ball m...

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Abstract

The invention provides a preparation method of pure single-phase ternary carbide Co3W3C and belongs to the field of hard alloy material preparation. Cobalt powder, tungsten powder and carbon powder serve as raw materials and are blended and subjected to intermittent ball milling together with hard alloy balls of different diameters and absolute ethyl alcohol, then cold pressing and a chemical reaction are conducted, and a green body containing the pure single-phase ternary carbide Co3W3C powder is obtained; then intermittent ball milling and crushing are conducted, sieving with a 400-600-mesh mesh screen is conducted, and the Co3W3C powder which is pure in physical phase and uniform in granularity is obtained; the Co3W3C powder is arranged in a die, subjected to cold pressing and forming, placed into a discharging plasma sintering equipment for sintering and cooled to the room temperature, and a Co3W3C block material containing a single physical phase can be obtained. A product obtained through the method is a pure single-phase substance.

Description

Technical field: [0001] The invention belongs to the field of hard alloy material preparation, in particular to a Co, W, C ternary carbide Co 3 W 3 The preparation method of C. Background technique: [0002] Proton exchange membrane fuel cells (PEMFCs) are considered ideal power sources for automobiles and portable electronic devices due to their high power density and low operating temperature. Cathode catalyst is one of the key materials in PEMFC. To commercialize PEMFC, a cathode catalyst with high efficiency is needed. At present, Pd / C is often used as the cathode catalyst of PEMFC, but its catalytic activity and stability still need to be improved. In recent years, some scholars have studied the influence of metal carbides on the catalytic performance of Pd / C, and found that adding Co to Pd / C 3 W 3 C can significantly improve the catalytic activity and stability of the cathode catalyst in acidic medium (such as: significantly reduce the overpotential in the reducti...

Claims

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Application Information

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IPC IPC(8): C01B31/30C04B35/56
CPCC01P2002/72C01P2004/03C04B35/56
Inventor 宋晓艳范金莲刘雪梅王海滨
Owner BEIJING UNIV OF TECH
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