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A kind of preparation method of equiaxed crystal nano tungsten carbide powder

A technology of nano-tungsten carbide and equiaxed crystals, which is applied in the direction of carbides, nanotechnology, tungsten/molybdenum carbides, etc., can solve the problems of being unable to meet environmental protection and safety, and achieve the smallest size difference, particle size reduction, and energy saving The effect of production costs

Active Publication Date: 2022-04-01
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods still cannot meet people's requirements for simplified process, environmental protection, cost reduction and safety improvement.

Method used

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  • A kind of preparation method of equiaxed crystal nano tungsten carbide powder
  • A kind of preparation method of equiaxed crystal nano tungsten carbide powder
  • A kind of preparation method of equiaxed crystal nano tungsten carbide powder

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preparation example Construction

[0041] As an example, this paper also specifically provides a green preparation method of equiaxed crystal nano-tungsten carbide powder, including the following steps:

[0042] (1) Weigh ammonium metatungstate and edible carbon source powders such as caramel, fructose, sucrose and soluble starch according to the molar ratio of 1:0.5~1.6, and prepare a solution with a concentration of 0.003~0.009 moles per liter with deionized water, Then place it in a plate-type heat-collecting magnetic stirring device and dry it at 85-135°C for 4-10 hours to obtain a colloidal precursor;

[0043] (2) Spread the colloidal precursor evenly on the inner wall of the corundum boat with a thickness of 0.5-1.2 mm, and finally put it into a high-vacuum graphite-lined tube furnace to complete the integrated treatment of cracking and reaction. The reaction temperature and time are 1300 ~1500℃ and 0.2~0.8 hours, the vacuum degree is (1.3~3.4)×10 -4 Pa, the final equiaxed crystal nano-tungsten carbide p...

Embodiment

[0046] The content disclosed in the present invention is described more specifically through the following examples. These examples are for illustrative purposes only. Embodiments of the present invention are not limited to these specific examples. All parts, percentages and ratios reported in the following examples are by weight unless otherwise stated. Moreover, all reagents used in the examples were commercially available and used without further treatment. Those skilled in the art can easily purchase or prepare the starting materials used in the examples. Unless otherwise specified, materials used in the examples were of analytical grade.

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Abstract

The invention relates to a preparation method of equiaxed crystal nano tungsten carbide powder. The method of the present invention comprises the following steps: (1) dissolving a tungsten source and an edible carbon source in water to form a solution, drying the solution to obtain a colloidal precursor; and (2) dissolving the colloidal precursor in absolute Pressure lower than 1.0×10 ‑2 React at a temperature of 1250-2000°C under a vacuum of Pa to obtain equiaxed crystal nano-tungsten carbide powder. The method of the invention adopts a safe, non-toxic and low-cost edible carbon source to obtain high-purity, nanometer-sized, equiaxed crystal tungsten carbide powder. Compared with the traditional method, the method of the present invention has the advantages of simple process, environmental protection, low cost and high safety, and can also show excellent tissue control precision, good process stability and repeatability.

Description

technical field [0001] The invention relates to the technical field of tungsten carbide powder preparation, in particular to a preparation method of tungsten carbide powder with high purity, small particle size and small size difference between crystal grains. Background technique [0002] Carbide has high strength, high hardness and high toughness, and is widely used in drill bits, printer needles, precision molds, precision cutting of difficult-to-machine materials, etc. In the process of preparing high-quality tungsten carbide cemented carbide, a crucial factor affecting the quality of cemented carbide is the nature of tungsten carbide powder used as raw material, including such as purity, grain size and morphology. In the cemented carbide industry, it is especially desirable to obtain equiaxed tungsten carbide powder raw materials with high purity and small particle size. [0003] At present, the commonly used preparation methods of equiaxed tungsten carbide powder main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/949B82Y40/00
CPCC01B32/949B82Y40/00C01P2002/72C01P2004/03C01P2004/64C01P2004/62C01P2006/80
Inventor 赵智胜马梦冬董洪峰张洋武英举何巨龙于栋利田永君
Owner YANSHAN UNIV
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