Preparation method of high cobalt nano/ultrafine wc-co composite powder

A composite powder, nanotechnology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of WC grain aggregation and growth, ultrafine grain high cobalt composite powder performance instability, cost High problems, to avoid abnormal oxygen content, easy control of carbon content, and pure phase

Active Publication Date: 2021-02-12
JIANGXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] In order to solve the above problems, the present invention provides a preparation method of high-cobalt nano / ultrafine WC-Co composite powder, which is simple to operate and can effectively inhibit the aggregation and growth of WC crystal grains during the preparation process, which solves the problem of preparing ultrafine WC-Co composite powder in the prior art. When crystal high cobalt composite powder is prone to aggregation and growth of WC grains, the performance of ultrafine crystal high cobalt composite powder is unstable and the cost is high

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  • Preparation method of high cobalt nano/ultrafine wc-co composite powder

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Effect test

Embodiment 1

[0042] The preparation method of the high-cobalt nano / ultrafine WC-Co composite powder of the present invention is specifically carried out according to the following steps:

[0043] Step 1, dissolve 150g of cobalt chloride in deionized water, prepare a cobalt salt solution with a concentration of 1mol / L, put it in a stirring container and stir it, and heat it with a constant temperature water bath, the stirring speed is 600r / min, and the temperature of the water bath is 60°C ;

[0044] Step 2, mix soluble tungsten salt, cobalt salt and organic carbon in the aqueous solution evenly, among which ammonium metatungstate is used for soluble tungsten salt, cobalt acetate is used for cobalt salt, and sucrose is used for organic carbon; the precursor powder is obtained by spray drying, spray dried The inlet temperature is 150°C, the outlet temperature is 100°C, and the centrifuge speed is 10000r / min, followed by in-situ reduction carbonization in a fixed bed for one-step carbothermal...

Embodiment 2

[0047] The preparation method of the high-cobalt nano / ultrafine WC-Co composite powder of the present invention is specifically carried out according to the following steps:

[0048] Step 1. Dissolve 70g of cobalt acetate in deionized water to prepare a cobalt salt solution with a concentration of 1mol / L, put it in a stirring container and stir it, and heat it with a constant temperature water bath. The stirring speed is 600r / min, and the temperature of the water bath is 70°C;

[0049] Step 2, after uniformly mixing soluble tungsten salt, cobalt salt and organic carbon in the aqueous solution, ammonium tungstate is used for soluble tungsten salt, cobalt chloride is used for cobalt salt, and glucose is used for organic carbon; the precursor powder is obtained by spray drying, spray The inlet temperature of the drying is 280°C, the outlet temperature is 150°C, and the centrifuge speed is 12000r / min, followed by in-situ reduction carbonization in a fixed bed for one-step carbother...

Embodiment 3

[0052] The preparation method of the high-cobalt nano / ultrafine WC-Co composite powder of the present invention is specifically carried out according to the following steps:

[0053] Step 1. Dissolve 279.5g of cobalt nitrate in deionized water to prepare a cobalt salt solution with a concentration of 1mol / L, put it in a stirring container and stir it, and heat it with a constant temperature water bath. The stirring speed is 600r / min, and the temperature of the water bath is 80°C ;

[0054] Step 2, after mixing the soluble tungsten salt, cobalt salt and organic carbon in the aqueous solution evenly, the soluble tungsten salt is ammonium metatungstate, the cobalt salt is cobalt nitrate, and the organic carbon is maltose; the precursor powder is obtained by spray drying, spray The inlet temperature of drying is 200°C, the outlet temperature is 130°C, and the centrifuge speed is 11000r / min, followed by in-situ reduction carbonization in a fixed bed for one-step carbothermal reacti...

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Abstract

The invention discloses a preparation method of high-cobalt nanometer / ultrafine WC‑Co composite powder. 42.7‑279.5 g of cobalt salt is prepared into a cobalt salt solution with a concentration of 1 mol / L, which is placed in a stirring container for stirring and a constant temperature water bath is used. Heating; adding nano / ultrafine WC-6wt% Co composite powder with a uniformly distributed cobalt layer between WC grains into the stirring container, the dosage is 100g, stirring, and 22.3-119.1g ammonium oxalate is prepared to a concentration of 0.5mol / L Add the ammonium oxalate solution into the stirring container, stir, filter with suction, wash, and dry in a vacuum oven to obtain WC-6Co-CoC 2 o 4 Precursor composite powder; the precursor composite powder is put into a tubular hydrogen furnace for reduction, and after reduction, water cooling is obtained. The invention has simple operation, can effectively inhibit the aggregation and growth of WC grains during the preparation process, and the prepared high-cobalt composite powder has stable performance and low cost.

Description

technical field [0001] The invention belongs to the technical field of metal-ceramic composite powder preparation, and relates to a preparation method of high-cobalt nanometer / ultrafine WC-Co composite powder. Background technique [0002] Ultra-fine-grained cemented carbide can significantly improve the hardness and toughness of materials, and realize the "double high" performance of high hardness and high toughness, which has always been a hot research direction in the cemented carbide industry. Ultra-fine-grained high-cobalt cemented carbide has a high cobalt phase mean free path, good toughness and impact resistance, and fine WC grains have high hardness, realizing the combination of high hardness and high toughness. It has broad application prospects in important engineering fields such as machining and precision manufacturing. [0003] The key to the preparation of ultrafine-grained cemented carbide is the acquisition of high-quality nano / ultrafine composite powder an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B22F1/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/22B22F1/05B22F1/054B22F1/16
Inventor 羊求民苏伟陈丽勇陈颢
Owner JIANGXI UNIV OF SCI & TECH
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