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A kind of preparation method of metal-ceramic composite powder with core-shell structure

A metal-ceramic composite, core-shell structure technology, applied in the field of powder metallurgy, can solve the problems affecting the performance of cemented carbide, uneven metal distribution, waste of water resources, etc., and achieves the effect of saving time, uniform and dense coating, and not easy to segregate

Active Publication Date: 2020-06-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite powder prepared by this method has the following problems: 1) a large amount of impurities will be introduced during the long-time ball milling process, which will affect the performance after subsequent molding; Density difference, easy to cause uneven distribution of metal in the ceramic matrix, easy to cause segregation in the subsequent molding process, and affect the performance of cemented carbide
However, since the surface of the ceramic powder does not have catalytic activity, the ceramic powder needs to undergo complicated pretreatment processes such as roughening, activation, and sensitization to attach a small amount of palladium to the ceramic surface. The process is complicated, and each step needs to be washed with water, resulting in A lot of water waste and pollution
The activation process requires the use of expensive palladium chloride, which increases the cost. In addition, a small amount of metal palladium impurities are inevitably introduced into the powder.

Method used

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  • A kind of preparation method of metal-ceramic composite powder with core-shell structure
  • A kind of preparation method of metal-ceramic composite powder with core-shell structure
  • A kind of preparation method of metal-ceramic composite powder with core-shell structure

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Effect test

Embodiment 1

[0031] Cobalt chloride is used as chemical vapor deposition cobalt source, nitrogen is used as carrier gas, cobalt chloride is heated to 650°C, hydrogen is used as reducing gas, the temperature is 750°C, a small amount of cobalt is deposited on tungsten carbide powder with a particle size of 50 μm, and the deposition time is 1 min, the mass fraction of cobalt in the obtained cobalt-coated tungsten carbide composite powder is 0.01%. Put the powder into the autocatalytic cobalt plating stirring reactor, heat it in a water bath to 50°C, control the pH value to 8, use cobalt sulfate as the cobalt salt, hydrazine hydrate as the reducing agent, and the reaction time is 60 minutes to obtain cobalt-coated carbonized Tungsten composite powder, wherein the mass fraction of metal cobalt coating is 30%.

[0032] Field emission scanning electron microscope image of cobalt-coated tungsten carbide composite powder figure 1 shown, from figure 1 It can be seen that metal cobalt is completely...

Embodiment 2

[0034] Using nickel chloride as the source of chemical vapor deposition of nickel, argon as the carrier gas, heating nickel chloride to 680 ° C, hydrogen as the reducing gas, the temperature is 720 ° C, depositing a small amount of nickel on the titanium carbide powder with a particle size of 100 μm, and depositing The time is 5 minutes, and the mass fraction of nickel in the obtained nickel-coated titanium carbide composite powder is 0.1%. Put the powder into a self-catalyzed nickel-plating stirring reactor, heat it in a water bath to 70°C, control the pH value to 12, use nickel chloride as the nickel salt, sodium hypophosphite as the reducing agent, and the reaction time is 120 minutes to obtain nickel Coated titanium carbide composite powder, wherein the mass fraction of metal nickel coating is 50%.

[0035] Field emission scanning electron microscope image of nickel-coated titanium carbide composite powder figure 2 shown, from figure 2 It can be seen that metallic nick...

Embodiment 3

[0037] Ferrocene is used as chemical vapor deposition iron source, neon gas is used as carrier gas, ferrocene is heated to 150°C, hydrogen is used as reducing gas, the temperature is 900°C, a small amount of iron is deposited on silicon carbide powder with a particle size of 500 μm, and the deposition The time is 10 minutes, and the mass fraction of iron in the obtained iron-coated silicon carbide composite powder is 1%. Put the powder into a self-catalyzed iron-nickel plating stirring reactor, heat it in a water bath to 90°C, control the pH value to 10, use ferrous sulfate as iron salt, nickel sulfate as nickel salt, sodium borohydride as reducing agent, and react The time is 60 minutes, and the iron-nickel-coated silicon carbide composite powder is obtained, wherein the mass fraction of the metal coating amount is 10%.

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Abstract

The invention discloses a method for preparing a metal-ceramic composite powder with a core-shell structure. The preparation method comprises the following steps: 1) Catalyzing and activating the ceramic powder particles: placing the ceramic powder particles in a reactor, heating The reaction raw material, using the carrier gas to carry the reaction raw material vapor into the reactor, passing through hydrogen gas to undergo a reduction reaction, so that the catalytic metal is deposited on the surface of the ceramic powder particles; 2) The reaction of placing the ceramic powder particles obtained in step 1) in a water bath Add metal salt raw materials and reducing agent to the device, and coat the metal coating layer through self-catalyzed reaction to obtain metal-ceramic composite powder. The present invention saves the roughening, sensitization and activation processes in the traditional electroless metal plating process, does not need to use expensive palladium chloride catalyst, avoids the introduction of impurity palladium, and realizes metal plating and cladding at a relatively low temperature. The metal content is controllable, the overall coating process is simple, and it is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a method for preparing a core-shell structure cermet composite powder. Background technique [0002] Cemented carbide is generally a composite material made of high hardness, high elastic modulus refractory metal hard compounds WC, TiC, etc. as the main phase and metal Fe, Co and Ni as the binder phase, and made by powder metallurgy. It not only has the characteristics of high strength, high hardness, wear resistance, high temperature resistance, corrosion resistance, high elastic modulus and chemical stability of ceramics, but also has good toughness and plasticity. Therefore, cemented carbide is widely used in modern tools, high-temperature resistant materials, wear-resistant materials, corrosion-resistant materials, etc. It is one of the indispensable materials for many high-tech and modern industries, and is known as "the tooth of industry". [0003] Due to the sim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C23C16/06C23C16/44C23C18/34C23C18/36C23C28/02
CPCC23C16/06C23C16/4417C23C18/34C23C18/36C23C28/023B22F1/17
Inventor 杨亚锋张磊吕鹏鹏朱庆山
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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