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Production method of needle-shaped tungsten carbide powder

A production method and technology of tungsten carbide, which is applied in the direction of carbide, tungsten/molybdenum carbide, etc., can solve the problems of poor product quality stability, discoidization of crystal grains, poor stability, etc., and achieve excellent comprehensive mechanical properties. High degree of shape, good toughness and wear resistance

Active Publication Date: 2005-03-23
ZIGONG CEMENTED CARBIDE CORP +1
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Problems solved by technology

However, this kind of hard alloy whose WC crystal phase structure is disk-shaped is formed during the sintering process by using a relatively fixed (unique) raw material mixture powder, so there is a huge limitation on the composition (ingredient) range and product category of the alloy. For example, TiC, NC and other components cannot be added, otherwise it will prevent the preferential growth of WC grains in the sintering process, so that the grains cannot be discoidized; second, the stability is poor, because the discoid WC grains are During the sintering process, it is formed by the abnormal growth of the preferred crystal plane. The proportion of disc-shaped WC grains is greatly affected by the sintering process and the ratio of raw materials, and the product quality stability is poor.

Method used

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  • Production method of needle-shaped tungsten carbide powder
  • Production method of needle-shaped tungsten carbide powder

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Experimental program
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Effect test

Embodiment 1

[0018] A. Ingredients: 10kg of FSSS (Fischer's particle size) 18.8μm, with an aggregation degree of 18.43 WO 3 The raw material powder is placed in a double cone mixer, 1.56gNi(NO 3 ) 2 And 6.36g of NaCl are dissolved in 1.5L of water to form an aqueous solution, sprayed into the mixer under stirring conditions, mixed evenly, and then sent to the oven to dry to loose powder for use.

[0019] B. Reduction treatment: Put the above-mentioned powder into a graphite boat and send it into the molybdenum wire electric heating reduction furnace. 2 Protection and reduction treatment at 1100°C for 6.5 hours. After cooling, pass through an 80-mesh sieve to remove impurities.

[0020] C. Carbon and catalyst cobalt: Take 7kg of W powder obtained after reduction treatment, add 267.3g of carbon black powder and 1.75g ​​of Co powder into the ball mill, ball mill and mix uniformly to obtain W+C+Co mixed powder.

[0021] D. Carbonization treatment: The above-mentioned mixed powder is sent into a ca...

Embodiment 2

[0025] In this example, the batching and reduction treatment adopts WO with a FSSS (Fisher particle size) of 20.2μm and an aggregation degree of 46.47 3 10kg as raw material, adding catalyst Ni(NO 3 ) 1.5L of a mixed aqueous solution of 26.22g and 12.72g of NaCl, mixed uniformly and dried into a loose mixed powder, put into the boat and sent to the reduction furnace in H 2 Protection and reduction treatment at a temperature of 1150°C for 7 hours, after sieving to remove impurities, W powder is obtained.

[0026] Compounding carbon, adding catalyst cobalt and carbonization treatment: Take 7kg of the above-mentioned tungsten powder, 322g carbon black powder, and 3.15g Co powder into the ball mill. After the ball mill is evenly mixed, it is loaded into a boat. The carbonization treatment is carried out at 2000 ℃ for 9 hours, and then the ball mill is cooled. Sieved to contain W core and W 2 C tungsten carbide powder.

[0027] Secondary carbon, cobalt and carbonization treatment: Take...

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Abstract

A process for preparing acicular tugsten powder from WO3 includes such steps as proportionally mixing raw materials, reducing by catalyst (Ni and Na or K), first adding C and Co, carbonizing, second adding C and Co, carbonizing and ball grinding.

Description

Technical field [0001] The invention belongs to a production method of raw material powder for cemented carbide production, in particular to a production method of tungsten carbide (WC) powder with needle-shaped crystal grains. The WC powder produced by this method can be widely used in the production of cutting tools, wear-resistant tools, mine drilling, and development tools. Background technique [0002] WC-Co-based binary alloy not only has excellent fracture strength, but also has high hardness, so it is widely used as cutting, wear resistance, mine drilling, mining and other tools. In the production of such alloys, the internal quality of the WC powder as the main raw material determines the overall performance of the alloy to a great extent. Conventional WC powder is used to produce WC-Co. The WC grains in the base binary alloy and its metallographic structure are usually equiaxed triangular prisms or polygonal prisms. Its production method is to use blue tungsten (WO 2.9 ...

Claims

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Application Information

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IPC IPC(8): B22F9/20C01B32/949
Inventor 何宪峰周永贵刘清才黄新石建华
Owner ZIGONG CEMENTED CARBIDE CORP
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