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Method for preparing hard alloy containing slab-shaped tungsten carbide crystal grain

A cemented carbide, tungsten carbide single crystal technology, applied in the field of tungsten carbide cemented carbide preparation technology, can solve the problem that hardness, wear resistance, strength, toughness and fracture resistance cannot be effectively improved, the number and size of plate WC Difficult to control, damage the performance of cemented carbide and other problems, to achieve the effect of low input cost, good reproducibility and optimized performance

Inactive Publication Date: 2008-02-06
SHANGHAI UNIV
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Problems solved by technology

Among the above methods, the first four methods have the disadvantages that the number and size of plate-shaped WC are difficult to control, and the proportion of plate-shaped grains is small, which makes the various properties of cemented carbide, especially hardness, wear resistance, strength, toughness and resistance. Fracture performance cannot be effectively improved
However, because the original powder used in the (5) method is not WC, it may damage the performance of the cemented carbide due to a small fluctuation of the carbon content.

Method used

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  • Method for preparing hard alloy containing slab-shaped tungsten carbide crystal grain

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Experimental program
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Embodiment 1

[0023] The technological process and steps of the present embodiment are as follows:

[0024] (1) First prepare plate-shaped tungsten carbide single crystal particles as seed crystals: adopt WO with a purity of 99.5% 3 and spectroscopically pure C as raw materials, and the two are compounded at a molar ratio of 1:4, that is, WO 3 : C=1:4; after mixing it, add NaCl salt according to the ratio of salt to material 1.5:1, and use absolute ethanol as the dispersion medium, and then mix; then dry and sieve; put the above-mentioned uniformly mixed raw materials into Put it into a crucible, roast it at 1200°C in an argon atmosphere, and keep it warm at this temperature for 3 hours; the product after roasting is cooled to room temperature with the furnace; then rinse the synthesized product with distilled water three times to remove the residual molten salt particles, After drying, the plate-shaped tungsten carbide single crystal particles are obtained (for more detailed process metho...

Embodiment 2

[0029]The technological process and steps of the present embodiment are as follows:

[0030] (1) First prepare plate-shaped tungsten carbide single crystal particles as seed crystals, and its preparation method is exactly the same as the first step in the above-mentioned embodiment 1;

[0031] (2) Take a certain amount of commercial WC powder, commercial Co powder and the plate-shaped WC single crystal particles prepared above as raw materials; weigh the ingredients according to the specified weight ratio, weigh 17g of WC powder, 2g of Co powder and WC powder Seed crystal grain 1g; plate-shaped WC seed crystal grain size is 1-3μm, aspect ratio is 1:1-5:1; the above-mentioned WC powder and Co powder are put into a ball mill pot, and the ball mill medium is WC hard Alloy balls, the ball-to-material ratio is 20:1, the ball milling speed is 150 rpm, and the ball milling time is 20 hours; then add the above-mentioned plate-shaped WC seed crystal grains, and fully mix together;

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Abstract

The present invention relates to a process of a hard alloy containing tabular tungsten carbide (WC) crystal grains, belonging to the technology field of WC hard alloy preparing, and is characterized in that the tabular WC single crystal grains are used as seed crystals and mixed with commercial WC powder and Co powder. The mixture ratio of the raw materials is WC powder 80-90 percent, Co powder 5-15 percent and WC crystal grain of the seed crystal 3-8 percent. After high-energy ball milling and in particular adopting a special heat pressing technology, the mixed materials can be made into a hard alloy containing directionally arrayed tabular WC crystal grains. Advantages of the present invention are that the quantity, size and ratio of the length and the thickness of the tabular WC crystal grains can be controlled by adjusting the size and the quantity of the added tabular WC seed crystals, thereby optimizing the performance of the hard alloy. The invention is simple in technology, low in cost and good in reproducibility.

Description

technical field [0001] The invention relates to a method for preparing cemented carbide containing plate-shaped tungsten carbide (WC) grains, and belongs to the technical field of tungsten carbide cemented carbide preparation technology. Background technique [0002] Cemented carbide has high elastic modulus, high hardness, excellent thermal stability, high temperature oxidation resistance and corrosion resistance, and has been widely used in machining, mining and other industries. The hardness (that is, wear resistance) and toughness (that is, fracture resistance) of traditional cemented carbide are often a pair of contradictions. If the wear resistance is increased, the fracture resistance will be reduced, and on the contrary, if the fracture resistance is increased, the wear resistance will decrease again. Usually, people change the wear resistance and fracture resistance of cemented carbide by changing the particle size of WC, the content of Co and the addition of other...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08
Inventor 朱丽慧黄清伟
Owner SHANGHAI UNIV
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