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Preparation method of WC-Co nano powder added with grain growth inhibitor

A technology of grain growth and nano-powder, which is applied in the field of powder metallurgy, can solve the problems of unsuitability for large-scale production, cumbersome preparation methods, and long time consumption, and achieve the effects of fine particles, short diffusion process, and short reaction time

Active Publication Date: 2017-06-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these preparation methods either consume a lot of energy and take a long time, or the preparation methods are cumbersome and small in scale, which is not suitable for large-scale production.

Method used

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  • Preparation method of WC-Co nano powder added with grain growth inhibitor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 9.44g of ammonium metatungstate, 5g of cobalt nitrate hexahydrate, 4.3g of urea, 10g of ammonium nitrate, 6.5g of glucose and 0.14g of ammonium vanadate into a beaker and add an appropriate amount of water to dissolve to obtain a clear solution. Heating on an electric furnace until the reaction occurs, and fluffy precursor powder is obtained. Put the precursor powder into a tube furnace for carbonization. The carbonization temperature is 950°C, the holding time is 2.5h, the heating rate is 8°C / min, and the protective atmosphere is argon. WC-Co nano powder.

Embodiment 2

[0024] Put 9.44g ammonium metatungstate, 3.8g cobalt nitrate hexahydrate, 4.3g urea, 10g ammonium nitrate, 6.5g glucose and 0.14g ammonium vanadate into a beaker, add an appropriate amount of water to dissolve to obtain a clear solution, and place the solution in Pre-heated to 260 ° C muffle furnace, after the reaction took out to obtain the precursor powder. Place the body powder in a vacuum furnace for carbonization, the reaction temperature is 900°C, the holding time is 1.5h, the heating rate is 5°C / min, the vacuum degree is 100MPa, and naturally cooled to room temperature to obtain VC-doped WC-Co nanopowder .

Embodiment 3

[0026] Put 18.7g of ammonium metatungstate, 7.57g of cobalt nitrate hexahydrate, 8.5g of urea, 20g of ammonium nitrate, 13g of glucose and 0.5g of chromium nitrate into a beaker, add an appropriate amount of water to dissolve to obtain a clear solution, and place the solution in a preheated Heat it in a muffle furnace at 245°C until the combustion reaction is complete, and take out the precursor powder. Grind the precursor powder, then place it into a tube furnace for carbonization, the carbonization temperature is 1000°C, the holding time is 3h, the heating rate is 10°C / min, and naturally cooled to room temperature to obtain Cr 3 C 2 Doped WC-Co nanopowders.

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Abstract

The invention provides a preparation method of WC-Co nano powder added with a grain growth inhibitor, and belongs to the technical field of powder metallurgy and powder preparation. The preparation method comprises the following steps: ammonium metatungstate, cobalt nitrate, fuel, ammonium nitrate, metal salt with a needed amount of the added grain growth inhibitor and an organic carbon source are used as raw materials, and oxide / carbon composite powder is prepared by adopting a low-temperature combustion synthesis method; and then carbonization is carried out under atmosphere protection or vacuum to obtain the WC-Co nano powder mixed with the grain growth inhibitor. According to the preparation method, the low-temperature combustion synthesis method belongs to a liquid-phase synthesis method, molecular-level mixing is achieved, so that diffusion range of the carbon in the carbonization process is short, and the requirements for the reaction temperature requirement and the reaction time requirement are low; and in addition, the raw materials are simple to obtain, the equipment is simple, the process is fast, and large-scale production can be realized.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and relates to a method for preparing WC-Co nano powder, in particular to a method for preparing WC-Co nano powder added with a grain growth inhibitor. Background technique [0002] WC-Co cemented carbide has a series of excellent properties such as high strength, high hardness, high thermal conductivity, high temperature resistance and corrosion resistance, so it has achieved great success in metal cutting, rock drilling, forming molds, wear-resistant parts and other industrial fields. widely used. Studies have shown that refining the grains of WC-Co cemented carbide can effectively improve its mechanical properties. To prepare ultra-fine-grained WC-Co cemented carbide, it is first necessary to prepare ultra-fine WC-Co cemented carbide powder. The traditional methods for preparing WC-Co nano-cemented carbide powder mainly include ball milling method and high temperature self-propagating combust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22C22C1/05
CPCB22F9/22C22C1/051
Inventor 秦明礼陈铮陈鹏起赵尚杰鲁慧峰吴昊阳贾宝瑞曲选辉
Owner UNIV OF SCI & TECH BEIJING
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