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Method for simply and rapidly preparing nano WC-Co composite powder

A kind of composite powder and nanotechnology, which is applied in the field of preparation of nanocomposite materials, can solve the problems of difficult and accurate control of carbon content, difficulty in mass production, complex process, etc., to simplify production equipment and process routes, and control the growth of grains , The effect of reducing the reaction temperature

Active Publication Date: 2015-02-11
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mechanical alloying is easy to introduce impurities during the preparation process, the particle size distribution is uneven, and the powder is easy to agglomerate; the thermochemical synthesis method has a complicated process for its carbonization process, and it is difficult to accurately control the carbon content; the in-situ carburizing reduction method The disadvantage is that undecomposed polymers can still be found in the final product, and the product is affected; the plasma method is not easy to maintain the continuous stability of the ion flow, if the plasma flow cannot be sustained and stable, the evaporation and reaction of the raw materials cannot be guaranteed; the sol -The process of gel method is more complicated, the cost is high, it is easy to crack when drying, and it is difficult to produce in batches

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 74g cobalt nitrate hexahydrate and 60.6g cobalt chloride hexahydrate were dissolved in 300ml deionized water to form a cobalt compound solution, and 120ml concentrated ammonia water (containing NH 3 Mass percent content 25%~28%), and keep stirring, make Co 2+ Co(NH 3 ) 6 2+ , add 18.5g starch, 23g nano-carbon black and 22g nano-activated carbon to it and stir, then slowly add 500ml ammonium metatungstate solution (containing 219g tungsten trioxide), place it in a constant temperature water bath and heat it in a water bath at 70°C, and use The electric stirrer is fully stirred, and with the evaporation of the mixed solution, the precipitate is evenly precipitated and adsorbed on the surface of nano-carbon black and nano-activated carbon, filtered, washed, and dried at 90°C to constant weight to obtain the WC-Co composite powder precursor body. In a vacuum atmosphere, the precursor was heated to 450°C for 90 minutes, and further heated to 1000°C for 150 minutes to obt...

Embodiment 2

[0026] 48.45g cobalt chloride hexahydrate was dissolved in 200ml deionized water to make cobalt chloride solution, and 50ml concentrated ammonia water (containing NH 3 Mass percent content 25%~28%), and keep stirring, make Co 2+ Co(NH 3 ) 6 2+ , add 46.70g of nano-carbon black to it and stir, then slowly add 500ml of ammonium metatungstate solution (containing 222.56g of tungsten trioxide), place it in a constant temperature water bath and heat it in a water bath at 90°C, and fully stir it with an electric stirrer, With the evaporation of the mixed solution, the precipitate was uniformly precipitated and adsorbed on the surface of nano-carbon black, filtered, washed, and dried at 120°C to constant weight to obtain the WC-Co composite powder precursor. In a vacuum atmosphere, the precursor was heated to 600°C for 60 minutes, and further heated to 1050°C for 120 minutes to obtain WC-Co composite powder suitable for preparing WC-6Co cemented carbide, which was measured by X-ra...

Embodiment 3

[0028] Dissolve 9.88g cobalt nitrate hexahydrate, 8.08g cobalt chloride hexahydrate, and 9.54g cobalt sulfate heptahydrate in 200ml deionized water to form a cobalt compound solution, add 25ml concentrated ammonia water (containing NH 3 Mass percent content 25%~28%), and keep stirring, make Co 2+ Co(NH 3 ) 6 2+ , then slowly add 400ml of ammonium tungstate solution (containing 110g of tungsten trioxide) and 200ml of ammonium metatungstate solution (containing 119.66g of tungsten trioxide), then add 25g of nano activated carbon and 23.5g of nano carbon black, and place them in a constant temperature water bath Heat in a water bath at 80°C, and continue to stir fully with an electric stirrer. With the evaporation of the mixed solution, the precipitate is evenly precipitated and adsorbed on the surface of nano-activated carbon and nano-carbon black. Filter, wash, and dry the precipitate at 180°C until constant Weight, to obtain the WC-Co composite powder precursor. In a vacuu...

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Abstract

The invention relates to a preparation technology of nano composite material, in particular to a method for simply and rapidly preparing nano WC-Co composite powder. The method comprises the following steps: firstly, preparing solution, secondly, preparing WC-Co composite powder precursor, and thirdly, preparing the nano WC-Co composite powder. The method has the advantages that molecular uniform mixing can be achieved, the prepared WC-Co composite powder has good dispersibility, production equipment and a process route are simplified, reducing gas or inert protective gas with potential hazards, such as H2, CH4, CO and the like, is not required to be used, and the cost is reduced.

Description

technical field [0001] The invention relates to a preparation technology of nanocomposite materials, in particular to a simple and rapid method for preparing nanometer WC-Co composite powder. Background technique [0002] Nano-tungsten carbide has the "double high" characteristics of high hardness and high strength at the same time, which completely solves the contradiction between the strength and hardness of traditional cemented carbide, and has become a hot spot for scientists from all over the world in the field of "refractory and superhard materials". one. One of the key technologies for the production of nano-hard alloys is to prepare nano-WC powder or WC-Co composite powder. How to obtain uniformly distributed nano-WC powder or nano-WC-Co composite powder is still a research hotspot. [0003] In recent years, with the deepening of development, the preparation method of nano-WC-Co composite powder has made great progress and expansion. The main methods for preparing n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B82Y40/00
Inventor 王玉香文小强周健袁德林郭春平普建周新华陈佩琳
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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