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Preparation method of nickel coated ceramic composite powder

A technology of ceramic composite and ceramic powder, which is applied in the field of surface treatment of micron particles, can solve the problems of coating uneven self-nucleating metal, complicated process, easy introduction of impurity salts, etc., and achieves low production cost and simple preparation process , the effect of high completeness of coating

Active Publication Date: 2018-10-23
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

[0004] The traditional electroless plating and electroplating methods are complicated in process, and the ceramic particles need to undergo complicated pretreatment processes such as roughening, activation, and sensitization, which are expensive; and it is easy to introduce impurity salts; the agitation uniformity changes during the enlarged production process, resulting in coating Uneven or even a large amount of self-nucleating metals; the reaction process produces a large amount of toxic and harmful waste liquid, which is easy to cause environmental pollution

Method used

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  • Preparation method of nickel coated ceramic composite powder

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Experimental program
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Effect test

Embodiment 1

[0027] The fluidized bed reactor is heated to a reaction temperature of 750°C, and 20.0 g of titanium carbide ceramic powder with a particle size of 50 μm is added to the fluidized bed. The fluidizing gas is a mixed gas of argon and hydrogen, and the gas velocity is 0.1 m / s , the ratio of argon to hydrogen is 5:2, nickel chloride is used as nickel source, heated at 800°C, nickel chloride vapor uses argon as carrier gas, and the gas velocity of carrier gas is 0.05m / s. In the bed, it reacts with the hydrogen in the fluidized bed, and the reaction time is 15 minutes to obtain nickel-coated titanium carbide ceramic composite powder, and the tail gas enters the treatment system through the pipeline.

[0028] The field emission scanning electron microscope image of the nickel-coated titanium carbide composite is shown in figure 1 shown, from figure 1 It can be seen that metallic nickel is completely deposited on the surface of titanium carbide particles.

Embodiment 2

[0030] The fluidized bed reactor is heated to a reaction temperature of 700°C, and 10.0 g of silicon carbide ceramic powder with a particle size of 100 μm is added to the fluidized bed. The fluidizing gas is a mixed gas of argon and hydrogen, and the gas velocity is 0.05 m / s , the ratio of argon to hydrogen is 2:1, nickel bromide is used as the nickel source, heated at 700°C, the nickel bromide vapor is carried by argon as the carrier gas, and the carrier gas velocity is 0.01m / s, loaded into the fluidized In the bed, it reacts with the hydrogen in the fluidized bed, and the reaction time is 5 minutes to obtain nickel-coated ceramic composite powder, and the tail gas enters the treatment system through the pipeline.

Embodiment 3

[0032] The fluidized bed reactor is heated to a reaction temperature of 800°C, and 10.0 g of tungsten carbide ceramic powder with a particle size of 500 μm is added to the fluidized bed. The fluidizing gas is a mixed gas of argon and hydrogen, and the gas velocity is 0.5 m / s , the ratio of argon to hydrogen is 10:1, nickel iodide is used as the nickel source, heated at 850°C, the nickel iodide vapor uses argon as the carrier gas, and the gas velocity of the carrier gas is 0.1m / s. In the bed, it reacts with the hydrogen in the fluidized bed. The reaction time is 20 minutes, and the nickel-coated ceramic composite powder is obtained, and the tail gas enters the treatment system through the pipeline.

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Abstract

The invention discloses a preparation method of nickel coated ceramic composite powder. The preparation method comprises the following steps that a fluidized bed reactor is heated to reaction temperature; ceramic powder is added into a fluidized bed; fluidized gas is mixed gas of argon gas and hydrogen gas; a nickel precursor is used as a nickel source; heating is performed to obtain nickel precursor steam; the nickel precursor steam is carried into the fluidized bed by using argon gas as carrier gas and takes chemical vapor deposition reaction with hydrogen gas in the fluidized bed; the nickel coated ceramic composite powder is obtained. The preparation technology process of the nickel coated ceramic composite powder provided by the invention is simple; the production cost is low; the amplification production and the continuous operation can be easily realized. The synthesized nickel coated particle powder has core-shell structure features; the interface combining capacity of metal nickel and particle powder is high; the abrasion resistant performance of a metal ceramic composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of micron particles, and in particular relates to a preparation method of nickel-coated ceramic particle composite powder. Background technique [0002] Cermet is a heterogeneous composite material composed of metal or alloy and one or several ceramic phases. It has the high strength, high hardness, wear resistance, high temperature resistance, oxidation resistance and chemical stability of ceramics. And other characteristics, also has good metal toughness and plasticity. As the basic unit of metal-ceramic materials, metal-ceramic composite powder can achieve uniform mixing of individual particles, and can improve the interface bonding force and distribution uniformity of the ceramic phase and metal during the sintering process. It can be widely used in hard alloys, high-performance electrical contacts, electromagnetic wave shielding, catalysis, wear-resistant and heat-insulating coatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/88
CPCC04B41/4531C04B41/5144C04B41/88
Inventor 杨亚锋朱庆山信凤霞吕鹏鹏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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