A Gradient Cemented Carbide Material of Gradient Hard Alloy with Surface Hardness and Internal Toughness

A cemented carbide, gradient-like technology, applied in the field of cemented carbide materials, can solve the problems of increasing the preparation cycle and preparation cost, the surface layer of cemented carbide does not contain Ti, and the cryogenic treatment time is long, so as to improve the overall transverse fracture strength, The effect of good wear resistance and short preparation cycle

Active Publication Date: 2022-03-18
SICHUAN UNIV
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Problems solved by technology

[0004] Although through these special technologies, the surface layer of the cemented carbide contains Ti or has a high Ti content, and the interior does not contain Ti or has a low Ti content, so as to achieve the purpose of high surface hardness and high internal toughness of the cemented carbide, but regardless of laser selective melting 3D printing or structure-based The method of preparing gradient cemented carbide by traditional method is low in efficiency and high in cost, which is not conducive to large-scale application, and the coating-cryogenic treatment is two more processes after the preparation of cemented carbide, and the cryogenic treatment time is very long, which increases the preparation time. Cycle time and preparation costs

Method used

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  • A Gradient Cemented Carbide Material of Gradient Hard Alloy with Surface Hardness and Internal Toughness
  • A Gradient Cemented Carbide Material of Gradient Hard Alloy with Surface Hardness and Internal Toughness
  • A Gradient Cemented Carbide Material of Gradient Hard Alloy with Surface Hardness and Internal Toughness

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preparation example Construction

[0058] Another aspect of the present invention provides a method for preparing a YA-type gradient cemented carbide material that is hard on the outside and tough on the inside, that is, the method for preparing the gradient cemented carbide material described in the first aspect of the present invention, the method comprising:

[0059] Step 1. Mix metal binder, refractory carbide, AlN powder and WC powder.

[0060] According to the present invention, in step 1, metal binder, refractory carbide, AlN powder and WC powder are as described in the first aspect of the present invention, weigh metal binder, refractory carbide, AlN powder and WC powder, mix to get a mixture.

[0061] Step 2, grinding and drying the mixture obtained in step 1, and pressing it into a green body.

[0062] According to the present invention, in step 2, the mixture obtained in step 1 is ground, preferably by using grinding equipment commonly used in the art, and the grinding equipment is preferably a ball...

Embodiment 1

[0118] Gradient cemented carbide materials were prepared by weighing raw materials by weight percentage, in which AlN with an average particle size of 2.00 μm accounted for 1.2%, Co with a particle size of 1.17 μm accounted for 16%, TaC with a particle size of 1.28 μm accounted for 2%, and the rest were 6.00 μm of WC, the sum of the weight percentages of each raw material component is 100%;

[0119] Put WC powder, TaC powder, Co powder, and AlN powder into the roller ball mill for grinding. The grinding ball is Φ6mm WC-8wt% Co cemented carbide ball, the weight ratio of ball to material is 10:1, and the grinding medium is Water ethanol, the addition amount is 300mL, grind for 48h at a speed of 60r / min;

[0120] After grinding, the cemented carbide slurry is filtered through a 400-mesh sieve, and vacuum-dried at 5Pa and 90°C. After drying, add SD rubber molding agent with a weight percentage of 5.5%, and mix well and then vacuum-dry at 5Pa and 90°C. , the dried mixed material i...

Embodiment 2

[0131] The preparation process of Example 1 was repeated, with the difference that the proportion of AlN powder was 0.9%, and the other processes were the same as in Example 1 to obtain a gradient cemented carbide material.

[0132] The thickness of the surface layer of the prepared gradient cemented carbide material is about 160 μm, and the microstructure of the near-surface area is shown in Figure 4 shown.

[0133] Figure 4 Among them, the larger white phase is the hard phase containing Ta, and the larger black phase is the hard phase containing Al, indicating that the cemented carbide has formed a gradient structure, and the thickness of the gradient surface layer is about 160 μm, which is higher than that in Example 1. thicker, indicating that as the AlN content decreases, the thickness of the gradient surface layer increases, which is mainly because the AlN distribution density decreases as the AlN content decreases. Therefore, under the same sintering temperature and ...

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Abstract

The invention discloses a YA type gradient cemented carbide material which is hard on the outside and tough on the inside. The gradient cemented carbide material is prepared from raw material components including metal binder, refractory carbide, AlN powder and WC powder. The present invention introduces a small amount of AlN on the basis of the YA cemented carbide composition, and through high-temperature sintering, the AlN on the surface of the cemented carbide is decomposed, nitrogen is released into the surrounding environment, and the N content in the surface layer is reduced, so that the Al element in the surface layer is activated toward the inner N. High regional migration, thus forming a gradient structure with higher Al and N content than the surface layer, and obtaining YA grade gradient cemented carbide materials. In the present invention, by introducing Al and N, the internal fracture toughness and the overall transverse fracture strength of the gradient cemented carbide material are improved, the surface hardness is not reduced, and the internal hardness is slightly reduced, so that the gradient cemented carbide material with surface hardness and internal toughness is obtained, and the gradient hardness The gradient structure of the high-quality alloy material is formed in situ during sintering without adding additional processes.

Description

technical field [0001] The invention belongs to the field of cemented carbide materials, and relates to a cemented carbide material, in particular to a YA gradient cemented carbide material which is hard on the outside and tough on the inside. Background technique [0002] Tungsten-tantalum (niobium) cobalt-based cemented carbide (YA) is composed of tungsten carbide, tantalum carbide (niobium carbide) and cobalt / iron / nickel. It has high normal temperature hardness, high temperature hardness, wear resistance and oxidation resistance. , suitable for semi-finishing of chilled cast iron, non-ferrous metals and their alloys, as well as finishing and semi-finishing of high manganese steel, hardened steel and other materials. Although the hardness and wear resistance of this type of tool material are high enough, and the service life is relatively high under normal wear conditions, the tool is subjected to periodic cutting during intermittent cutting, such as machining workpieces w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/02C22C1/05C22C1/10
CPCC22C29/02C22C29/005C22C1/051
Inventor 杨天恩王昊梓轲朱幼宇桑江燕
Owner SICHUAN UNIV
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