High-thermal-conductivity cobalt powder and preparation method thereof

A technology of cobalt powder and high conductivity, applied in the field of high thermal conductivity cobalt powder and its preparation, can solve problems such as difficult uniform dispersion, low reactivity, agglomeration, etc., to improve reactivity and purity, easy to operate, and improve conductivity performance effect

Active Publication Date: 2021-05-28
YUCHEN ADVANCED ENERGY MATERIALS & TECH WUXI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface area, high specific surface energy and serious agglomeration of graphene and carbon nanotubes, it is difficult to disperse evenly on the cobalt metal matrix; and graphene and carbon nanotubes have low density, neither hydrophilic nor It is not lipophilic and has low reactivity, which makes it difficult to modify it. Various reasons lead to the difficulty of compounding graphene and carbon nanotubes with metal cobalt matrix. The traditional method of directly doping graphene and carbon nanotubes is very difficult. It is difficult to prepare cobalt powder with excellent thermal conductivity

Method used

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  • High-thermal-conductivity cobalt powder and preparation method thereof
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  • High-thermal-conductivity cobalt powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] (1) Weigh the corresponding melamine and cobalt oxalate according to the weight ratio of 1.0%, grind and mix them evenly in a mortar, put the mixture in a quartz boat, raise the temperature to 250°C for 1h in nitrogen, and then raise the temperature to 520°C for 3h , to obtain a compound of nitrogen carbide and cobaltous oxide;

[0031] (2) Calcining and reducing the above-mentioned composite of nitrogen carbide and cobaltous oxide in an atmosphere of decomposing ammonia at 400°C for 4 hours to obtain a composite of nitrogen carbide and cobalt powder;

[0032] (3) The composite of the above-mentioned nitrogen carbide and cobalt powder was kept at 800° C. for 2 hours in an argon atmosphere, and finally a highly conductive cobalt powder composited with graphene and carbon nanotubes was obtained.

Embodiment 2

[0034] (1) Weigh the corresponding melamine and cobalt carbonate according to the weight ratio of 5.0%, grind and mix them evenly in a mortar, put the mixture in a quartz boat, heat up to 300°C in a mixed gas of nitrogen and argon for 1 hour, and then heat up Keep at 550°C for 2 hours to obtain a composite of nitrogen carbide and cobaltous oxide;

[0035] (2) Calcining and reducing the composite of the above-mentioned nitrogen carbide and cobaltous oxide in an atmosphere of decomposed ammonia at 450°C for 5 hours to obtain a composite of nitrogen carbide and cobalt powder;

[0036] (3) The composite of the above-mentioned nitrogen carbide and cobalt powder was kept at 850° C. in an argon atmosphere for 2 hours, and finally a highly conductive cobalt powder composited with graphene and carbon nanotubes was obtained.

Embodiment 3

[0038] (1) Weigh the corresponding melamine and cobalt oxalate according to the weight ratio of 8.0%, grind and mix them evenly in a mortar, put the mixture in a quartz boat, raise the temperature to 260°C for 1 hour in argon, and then raise the temperature to 500°C to keep 2h, obtain the composite of nitrogen carbide and cobaltous oxide;

[0039] (2) Calcining and reducing the above-mentioned composite of nitrogen carbide and cobaltous oxide in an atmosphere of decomposing ammonia at 350°C for 6 hours to obtain a composite of nitrogen carbide and cobalt powder;

[0040] (3) The composite of the above-mentioned nitrogen carbide and cobalt powder was kept at 750° C. for 3 hours in an argon atmosphere, and finally a highly conductive cobalt powder composited with graphene and carbon nanotubes was obtained.

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Abstract

The invention provides high-conductivity cobalt powder and a preparation method thereof, and belongs to the technical field of metal powder preparation. The preparation method of the high-conductivity cobalt powder comprises the following steps of (1) grinding and uniformly mixing melamine and cobalt salt, and heating and reacting in an inert atmosphere in a stepped heating manner to obtain a compound of nitrogen carbide and cobaltous oxide; (2) roasting the compound of the nitrogen carbide and the cobaltous oxide in a decomposed ammonia atmosphere to obtain a compound of the nitrogen carbide and cobalt powder; and (3) carrying out a constant-temperature reaction on the compound of the nitrogen carbide and the cobalt powder in an inert atmosphere to obtain the high-conductivity cobalt powder compounded with graphene and/or carbon nanotubes. According to the preparation method, the raw materials are subjected to low-temperature heat treatment firstly, then the graphene and the carbon nanotubes are directly grown on the surface of the cobalt powder by adopting a high-temperature catalysis method, and the cobalt powder is chemically combined with the graphene and the carbon nanotubes, so that the heat conducting property of the cobalt powder is improved.

Description

technical field [0001] The invention belongs to the technical field of metal powder preparation, and in particular relates to a high thermal conductivity cobalt powder and a preparation method thereof. Background technique [0002] Cemented carbide is a kind of cermet material prepared by powder metallurgy method with refractory metal compound as matrix and transition metal as binder phase. The existing cemented carbide materials are mainly composed of matrix WC and binder phase Co metal. Cemented carbide has been widely used in the fields of automobile and aviation manufacturing, oil and gas drilling, geothermal energy exploration, mining, and wear-resistant parts because of its good wear resistance, high hardness, and high strength. When a considerable part of cemented carbide works in a high temperature environment for a long time, its thermal properties have a great influence on the failure behavior, and the thermal conductivity is one of the important physical paramete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00H01B1/02
CPCB22F1/0003B22F9/22H01B1/02Y02E60/10
Inventor 何爱山
Owner YUCHEN ADVANCED ENERGY MATERIALS & TECH WUXI
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