Preparation method for metal-ceramic composite powder of core-shell structure

A metal-ceramic composite and core-shell structure technology, applied in the field of powder metallurgy, can solve problems such as affecting performance, high price, pollution, etc., and achieve the effects of strong interface bonding ability, reduced production cost, and high coating integrity

Active Publication Date: 2019-02-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method for metal-ceramic composite powder of core-shell structure
  • Preparation method for metal-ceramic composite powder of core-shell structure
  • Preparation method for metal-ceramic composite powder of core-shell structure

Examples

Experimental program
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Effect test

Embodiment 1

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

[0032] The field emission scanning electron microscope image of cobalt-coated tungsten carbide composite powder is as follows figure 1 Shown from figure 1 It can be seen that the metal cobalt...

Embodiment 2

[0034] Nickel chloride is used as the chemical vapor deposition nickel source, argon is the carrier gas, nickel chloride is heated to 680°C, hydrogen is used as the reducing gas, and the temperature is 720°C. A small amount of nickel is deposited on titanium carbide powder with a particle size of 100μm. The time is 5 minutes, and the nickel mass fraction in the obtained nickel-coated titanium carbide composite powder is 0.1%. Put the powder into a stirred reactor for autocatalytic nickel plating, heat the water bath to 70℃, control the pH to 12, use nickel chloride as the nickel salt, sodium hypophosphite as the reducing agent, and the reaction time for 120min to obtain nickel The coated titanium carbide composite powder has a mass fraction of metal nickel coating of 50%.

[0035] The field emission scanning electron microscope image of nickel-coated titanium carbide composite powder is as follows figure 2 Shown from figure 2 It can be seen that metallic nickel is completely de...

Embodiment 3

[0037] Using ferrocene as the iron source for chemical vapor deposition, neon gas as the carrier gas, heating the ferrocene to 150°C, hydrogen as the reducing gas, at 900°C, depositing a small amount of iron on silicon carbide powder with a particle size of 500μm. 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 stirred reactor for autocatalytic iron-nickel plating, heat the water bath to 90°C, control the pH to 10, use ferrous sulfate as the iron salt, nickel sulfate as the nickel salt, and sodium borohydride as the reducing agent to react The time is 60 minutes to obtain iron-nickel coated silicon carbide composite powder, in which the mass fraction of the metal coating amount is 10%.

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Abstract

The invention discloses a preparation method for metal-ceramic composite powder of a core-shell structure. The preparation method comprises the following step (1) of performing catalytic activation treatment to ceramic powder particles, placing the ceramic powder particles in a reactor, and heating reactive materials; using carrier gas for carrying reactive material steam to enter the reactor, andadding hydrogen gas for reduction reaction, so that catalytic metal is deposited on the surface of the ceramic powder particles; the step (2) of placing the ceramic powder particles obtained in the step (1) in the reactor in a water bath, and adding metal salt raw material and reducing agents; and forming a metal coating through autocatalytic reaction, and obtaining the metal-ceramic composite powder. According to the preparation method, the procedures of coarsening, sensitization and reactivation in a traditional chemical metal coating process are omitted, and expensive palladium chloride catalysts are not required; the introduction of impurity palladium is avoided, and the metal coating is achieved at lower temperature; the metal content of the coating is controllable, and the overall coating technology is simple, and the preparation method is applied to industrial mass production.

Description

Technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a preparation method of a core-shell structure cermet composite powder. Background technique [0002] Cemented carbide is generally a composite material made by powder metallurgy by using refractory metal hard compounds WC and TiC with high hardness and high elastic modulus as the main phase and metal Fe, Co and Ni as the binding phase. 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 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 "industrial teeth". [0003] Due to the simple techn...

Claims

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Application Information

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Patent Type & Authority Applications(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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