Nano-scale wolfram carbine composite powder and method of manufacturing the same

A composite powder and tungsten carbide technology is applied in the field of preparation of nano-scale tungsten carbide composite powder, which can solve the problems of unsuitable industrial production, complex preparation process, difficult control, etc., and achieves narrow particle size distribution range, abundant sources and convenient operation. Effect

Active Publication Date: 2009-05-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common problem that these methods exist is: all contain cobalt in the tungsten carbide composite powder of preparation, also seldom relate to the preparation report of non-bonding phase composite powder in the document checked; Adopt vapor phase carbonization more in the above-mentioned method, make cost height, and The preparation process is complicated, difficult to control, and not suitable for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 81% powdered ammonium paratungstate, 18% nano-carbon black and 0.5% powdered ammonium metavanadate, 80g in total, in 500ml deionized water (70-100°C), stir to obtain a uniform mixture The solution is placed in a drying oven, heated at 100-300° C. for 1-2 hours, dried at 50-100° C. for 1-5 hours, and finally the precursor powder is obtained. Put the precursor powder in a high-temperature reaction furnace, and under vacuum conditions, at 1000-1200°C for 30-60 minutes, prepare nano-WC-V with an average particle size of 8 C 7 powder.

Embodiment 2

[0033]Dissolve 85% powdered ammonium metatungstate, 16% nano-carbon black and 1.2% powdered vanadium oxalate, 165g in total, in 1000ml deionized water (70-100°C), stir to obtain a mixed To obtain a uniform solution, put the solution in a drying oven, heat it at 100-300° C. for 1-2 hours, and dry it at 50-100° C. for 1-5 hours, and finally obtain the precursor powder. Put the precursor powder in a high-temperature reaction furnace, and under the protection of argon, under the condition of 1000-1200°C and 30-60 minutes, the nano-WC-V with an average particle size of 8 C 7 powder.

Embodiment 3

[0035] Dissolve 90% powdered ammonium paratungstate, 20% nano-carbon black and 0.8% powdered ammonium dichromate, 85g in total, in 500ml deionized water (70-100°C), stir to obtain a uniform mixture The solution is placed in a drying oven, heated at 100-300° C. for 1-2 hours, dried at 50-100° C. for 1-5 hours, and finally the precursor powder is obtained. Put the precursor powder in a high-temperature reaction furnace, and under vacuum conditions, at 1000-1200°C for 30-60 minutes, prepare nano-WC-Cr with an average particle size of 3 C 2 powder.

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PUM

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Abstract

The invention provides a nanometer carbonized tungsten compound powder, which includes carbonized tungsten, vanadium carbide or/and chrome carbide, and a metallic element without binding phase exists in the compound powder. The preparation method of the nanometer carbonized tungsten compound powder is characterized in that the powdery ammonium tungstate, the carbonaceous reducing agent and the inhibitor are adopted as raw materials, the raw materials are dissolved in deionized water or distilled water and evenly stirred so as to obtain a solution, then the solution is heated and dried, the precursor powder is obtained finally, the precursor powder is put into a high-temperature reaction furnace, under the vacuum, argon or hydrogen atmosphere protection condition and the condition of 1,000 to 1,200 DEG C and 30 to 60 min, the carbonized tungsten compound powder with the average particle diameter less than 100 nm and even particle size distribution is obtained through carbonization. The method has the characteristics of low reaction temperature, short reaction time, low manufacturing cost, simple process and the like, which is suitable for the industrial production and used for the ultrafine hard alloy nanometer carbonized tungsten compound powder.

Description

technical field [0001] The invention provides a preparation method of nanoscale tungsten carbide composite powder, which belongs to the field of preparation of nanoscale cemented carbide powder. Background technique [0002] Tungsten carbide (WC) is an important part of cemented carbide and cermet. It has high hardness, high wear resistance and excellent fracture toughness. It is known as "the tooth of industry". It is used in drilling tools, cutting tools, precision molds, It has been widely used in mining tools, printing needles, military armor-piercing bullets and other fields. [0003] Studies have shown that an effective way to improve the performance of WC cemented carbide is to reduce the grain size of the alloy to an ultrafine size, or even reach a nanoscale size. Nano-WC cemented carbide is a "double high" material with high toughness and high hardness that many material researchers are striving to pursue. The key technology is the preparation of raw material powde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24
Inventor 刘颖叶金文姜中涛涂铭旌
Owner SICHUAN UNIV
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