Plate-shaped crystal tungsten carbide powder, preparation method thereof and hard alloy

A technology of tungsten carbide powder and cemented carbide, applied in the direction of carbide, tungsten/molybdenum carbide, etc., can solve the problem that the number and size of plate-shaped WC grains are difficult to control, the proportion of plate-shaped grains is small, and the hardness of cemented carbide is , toughness and other comprehensive properties cannot be effectively improved

Active Publication Date: 2022-02-08
CHONGYI ZHANGYUAN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above preparation methods, it is common to obtain plate-shaped WC grains mainly by adding other substances (such as TiC, Y 2 o 3 etc.) combined with high temperature and high pressure sintering to induce the synthesis of cemented carbide containing plate-shaped WC grains, but these preparation methods generally have the difficulty in controlling the number and size of plate-shaped WC grains, the proportion of plate-shaped grains is small, or the grain orientation Poor performance, special sintering equipment and other shortcomings are required, so that the comprehensive properties such as hardness and toughness of cemented carbide cannot be effectively improved, and the application is limited.
[0004] At present, there are few processes and products that can realize mass production of plate-shaped tungsten carbide powder. It is necessary to prepare cemented carbide with plate-shaped crystal tungsten carbide structure through the above-mentioned special process conditions, which limits high-performance plate-shaped tungsten carbide to a certain extent. Powder production and application range
Thus, the preparation method of existing plate crystal tungsten carbide powder needs to be improved

Method used

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  • Plate-shaped crystal tungsten carbide powder, preparation method thereof and hard alloy
  • Plate-shaped crystal tungsten carbide powder, preparation method thereof and hard alloy
  • Plate-shaped crystal tungsten carbide powder, preparation method thereof and hard alloy

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Experimental program
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Effect test

Embodiment 1

[0055] Step 1: Ingredients WO 3 165.4kg, 27.8kg of natural gas carbon black (particle size is 100-400nm), chromium carbide 1.766kg (1.2% batching mass ratio) of Fibonacci particle size is 0.8 μm, grinds 600kg of alloy balls, and the ball-to-material ratio is 3:1, and then Add 100 liters of grinding medium pure water and 5.0 kg (2.5% batching mass ratio) of forming agent PVA (polyvinyl alcohol) into the wet mill, and grind the alloy balls under cooling water conditions for grinding. The grinding time is as shown in Table 1 , wet mill parameters 300L, speed 37 rpm, after grinding WO 3 The average particle size of carbon black is not greater than 0.2 μm, and the average particle size of carbon black after grinding is not greater than 0.3 μm;

[0056] Step 2: Transfer the homogeneously mixed slurry obtained in step 1 into a stirring container, and dry and granulate in a spray drying tower under hot air. The grain size requires 500-mesh sieving to remove fine powder below 10 μm an...

Embodiment 2

[0063] Step 1: Ingredients WO 3 165.4kg, 27.8kg of natural gas carbon black (particle size is 100-400nm), chromium carbide 1.766kg (1.2% batching mass ratio) of Fibonacci particle size is 0.8 μm, grinds 600kg of alloy balls, and the ball-to-material ratio is 3:1, and then 100 liters of grinding medium pure water and 5.0 kg (2.5% batching mass ratio) of forming agent PVA (polyvinyl alcohol) are added to the wet mill, and the grinding alloy balls are ground under cooling water conditions for 10 hours. Mill parameter 300L, speed 37 rpm, WO after grinding 3 The average particle size of carbon black is not greater than 0.2 μm, and the average particle size of carbon black after grinding is not greater than 0.3 μm;

[0064] Step 2: Transfer the homogeneously mixed slurry obtained in step 1 into a stirring container, and dry and granulate in a spray drying tower under hot air. The grain size requires 500-mesh sieving to remove fine powder below 10 μm and prepare for sintering;

...

Embodiment 3

[0071] Step 1: Ingredients WO 3 : 165.4kg, 27.8kg of natural gas carbon black (particle size 100-400nm), 4.498kg of chromium carbide with a Fischer particle size of 0.8μm (3.0% batching mass ratio), 600kg of grinding alloy balls, the ball-to-material ratio is 3:1, Add 100 liters of grinding medium pure water and 5.0 kg (2.5% batching mass ratio) of forming agent PVA (polyvinyl alcohol) into the wet mill, and grind the alloy balls under cooling water conditions to carry out the grinding process. The grinding time is 10 hours. The parameters of the wet mill are 300L, the speed is 37 rpm, and the WO after grinding 3 The average particle size of carbon black is not greater than 0.2 μm, and the average particle size of carbon black after grinding is not greater than 0.3 μm;

[0072] Step 2: Transfer the homogeneously mixed slurry obtained in step 1 into a stirring container, and dry and granulate in a spray drying tower under hot air. The grain size requires sieving to 625 mesh t...

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Abstract

The invention discloses plate-shaped crystal tungsten carbide powder, a preparation method thereof and a hard alloy. The method comprises the following steps: (1) mixing tungsten oxide, carbon powder, a grinding medium, a forming agent and a crystal form growth additive, and grinding to obtain mixed slurry; (2) drying and granulating the mixed slurry so as to obtain homogeneous microsphere precursor mixture powder; and (3) carbonizing the precursor mixture powder so as to obtain the plate-shaped crystal tungsten carbide powder. Therefore, the method does not need to prepare tungsten powder from tungsten oxide through high-temperature reduction step by step and prepare tungsten carbide from tungsten powder with carbon, the process is short, the production efficiency is high, the production cost is reduced by 20-35% compared with conventional tungsten carbide, the plate-shaped crystal tungsten carbide powder with good platy effect, high purity and adjustable granularity can be prepared and can be further matched with other hard-phase and bonding-phase materials, and the requirements of production raw materials such as hard alloy, tools, stamping dies and hard-surface materials are met.

Description

technical field [0001] The invention belongs to the field of non-ferrous metals and powder preparation, and in particular relates to a plate-like crystal tungsten carbide powder, a preparation method thereof and a hard alloy. Background technique [0002] With traditional tungsten carbide powder (its structure is as figure 1 The cemented carbide produced as raw material shown in a) is a brittle material, and it is difficult to give consideration to both hardness and strength at the same time. In recent years, some researchers have found that cemented carbide containing plate-like WC grains breaks through the limitations of traditional cemented carbide, can better solve the contradiction between hardness and strength of cemented carbide, and improve the comprehensive performance of cemented carbide to a certain extent. . Plate crystal cemented carbide has high toughness, high strength, high hardness, high wear resistance, high resistance to plastic deformation, high high te...

Claims

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Application Information

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IPC IPC(8): C01B32/949C22C29/08
CPCC01B32/949C22C29/08C01P2004/62C01P2004/03
Inventor 王韶毅刘承海黄文峰谢永邹兴金黄一春徐国钻羊求民钟志强杨正锋
Owner CHONGYI ZHANGYUAN TUNGSTEN
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