Method for preparing tungsten carbide by using regeneration tungsten powder

A technology of tungsten carbide and tungsten powder, applied in the direction of carbides and carbides of tungsten/molybdenum, to achieve the effect of promoting decomposition, easy fragmentation, and accelerating the rate of carbonization reaction

Active Publication Date: 2012-07-18
浏阳市鑫利粉末冶金有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The purpose of the present invention is to overcome the problems encountered in the above-mentioned existing tungsten powder carbonization method when it is used for the carbonization of regenerated tungsten powder, and to provide a method for preparing tungsten carbide powder that meets the requirements for cemented carbide production using regenerated tungsten powder as raw material. method

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  • Method for preparing tungsten carbide by using regeneration tungsten powder
  • Method for preparing tungsten carbide by using regeneration tungsten powder

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: Weigh 5 kg of tungsten powder with a Fischer particle size of 50 microns and a purity of 99.5%, and 0.175 kg of carbon black with a purity greater than 99%, and ball mill and mix them in a ball mill. After fully mixing evenly, transfer the mixture into a graphite boat, and slowly push it into the high temperature zone of a Φ120mm×1200mm graphite carbon tube furnace for primary carbonization. During the carbonization process, hydrogen gas is introduced at the same time, and the flow rate of hydrogen gas is controlled at 1.0 L / min. The carbonization temperature in the high temperature zone of the graphite carbon tube furnace is controlled at 1950°C, and the stay time of the boat in the high temperature zone is controlled at 80 minutes. After the primary carbonization is completed, the boat is slowly pushed out of the high-temperature zone of the graphite carbon tube furnace, and the primary carbonized material is obtained after it is slowly cooled. The carbo...

Embodiment 2

[0027] Example 2: Weigh 5 kg of tungsten powder with a Fischer particle size of 10 microns and a purity of 99.5%, and 0.160 kg of carbon black with a purity greater than 99%, and ball mill and mix them in a ball mill. After fully mixing evenly, transfer the mixture into a graphite boat, slowly push it into the high-temperature zone of a Φ120mm×1200mm graphite carbon tube furnace for primary carbonization. The carbonization temperature in the high temperature zone of the graphite carbon tube furnace is controlled at 1850°C, and the stay time of the boat in the high temperature zone is controlled at 50 minutes. After the primary carbonization is completed, the boat is slowly pushed out of the high-temperature zone of the graphite carbon tube furnace, and after it is slowly cooled, the primary carbonized material is obtained, and its carbon content is 3.0% according to sampling analysis. Then weigh 0.165kg of carbon black with a purity of more than 99% and the primary carbonized ...

Embodiment 3

[0028] Embodiment 3: Weigh 5 kg of tungsten powder with a Fischer particle size of 20 microns and a purity of 99.5%, and 0.160 kg of carbon black with a purity greater than 99%, and ball mill and mix them in a ball mill. After fully mixing evenly, transfer the mixture into a graphite boat, and slowly push it into the high temperature zone of a Φ120mm×1200mm graphite carbon tube furnace for primary carbonization. During the carbonization process, hydrogen gas is introduced at the same time, and the flow rate of hydrogen gas is controlled at 1.0 L / min. The carbonization temperature in the high temperature zone of the graphite carbon tube furnace is controlled at 1900°C, and the stay time of the boat in the high temperature zone is controlled at 60 minutes. After the primary carbonization is completed, the boat is slowly pushed out of the high-temperature zone of the graphite carbon tube furnace, and the primary carbonized material is obtained after it is slowly cooled. The carbo...

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Abstract

The invention discloses a method for preparing tungsten carbide by using regeneration tungsten powder. According to problems that the regeneration tungsten powder is big in particle size, small in specific surface area, poor in chemical activity and difficult to produce the tungsten carbide with high quality by using a traditional carbonization method directly, a two-step carbonization method is adopted to conduct carbonization on the regeneration tungsten powder. Firstly dosing is carried out according to the ratio of carbon black: tungsten powder=3.0-3.5:100 (weight), the carbon black and the tungsten powder are mixed in a ball mill, and primary carbonization is conducted under the conditions of 1800-2000 DEG C of the temperature and 50-80 minutes of carbonization time in a graphite carbon tube furnace; then carbon content in primary carbonization material is analyzed, carbon black amount is supplementally added and mixed in the ball mill, and secondary carbonization is conducted under the conditions of 1500-1700 DEG C of the temperature and 60-90 minutes of carbonization time in the graphite carbon tube furnace. Ball milling and screening are carried out on secondary carbonization products, and final tungsten carbide products are obtained. The method is simple in operation and easy to apply, and obtained tungsten carbide powder is stable in quality.

Description

technical field [0001] The invention relates to a method for preparing tungsten carbide powder, more specifically, a method for preparing tungsten carbide powder by using recycled tungsten powder as raw material. Background technique [0002] Tungsten is a metal with a high melting point. It has high hardness, good ductility, and good chemical stability. An important raw material for the production of cemented carbide. There are various preparation techniques for tungsten carbide, among which the preparation of tungsten carbide powder from tungsten powder is the most widely used method at present. [0003] The main methods for preparing tungsten carbide by carbonization of tungsten powder include solid carbon carbonization without hydrogen, solid carbon carbonization with hydrogen, and gas phase carbonization of methane. [0004] 1) Hydrogen-free solid carbon carbonization method, that is, after mixing tungsten powder and C (usually carbon black) in a certain proportion, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/34C01B32/949
Inventor 张雪云霍广生刘文峰
Owner 浏阳市鑫利粉末冶金有限公司
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