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A kind of WC-rich nanocrystalline gradient cemented carbide with high hardness surface layer and preparation method thereof

A cemented carbide and cemented carbide ingot technology, which is applied in the field of cemented carbide material preparation, can solve the problems that the strength and hardness, wear resistance and toughness of cemented carbide cutting tools cannot be taken into account, and is suitable for large-scale production and high performance. Strength and toughness, easy to implement effect

Active Publication Date: 2019-01-04
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of incompatibility between the strength and hardness, wear resistance and toughness of cemented carbide cutting tools, and to provide a preparation method for high-hardness surface-layer rich WC nanocrystalline gradient cemented carbide

Method used

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  • A kind of WC-rich nanocrystalline gradient cemented carbide with high hardness surface layer and preparation method thereof
  • A kind of WC-rich nanocrystalline gradient cemented carbide with high hardness surface layer and preparation method thereof
  • A kind of WC-rich nanocrystalline gradient cemented carbide with high hardness surface layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this example, V(C 0.5 N 0.5 ) as a grain inhibitor and a gradient forming component to prepare a high-hardness surface layer rich in WC nanocrystalline gradient cemented carbide, comprising the following steps:

[0047] With ultrafine powder WC, V(C 0.5 N 0.5 ), Co, (Ta, Nb)C as raw materials, mixed by ball mill, dried and sieved. Spark plasma sintering and vacuum sintering are used to prepare WC-rich nanocrystalline gradient cemented carbide on the surface, which specifically includes the following steps:

[0048] Step 1: prepare raw material powder and prepare raw material, the mass percent of raw material is: V(C 0.5 N 0.5 )4wt%, Co10wt%, (Ta, Nb)C 2wt%, Cr 3 C 2 0.65wt%, carbon black 0.5wt%, and the rest is WC.

[0049] Step 2: Ball Mill Mixing

[0050] Mix the raw materials and put them into a wet ball mill for wet grinding, the ball milling ratio is 10:1, the ball milling medium is absolute ethanol, the rotating speed is 150r / min, and the ball milling...

Embodiment 2

[0059] In this example, V(C 0.5 N 0.5 ) as a grain inhibitor and a gradient forming component to prepare the surface layer rich WC nanocrystalline gradient cemented carbide, comprising the following steps:

[0060] With ultrafine powder WC, V(C 0.5 N 0.5 ), Co, (Ta, Nb)C as raw materials, mixed by ball mill, dried and sieved. Spark plasma sintering and vacuum sintering are used to prepare WC-rich nanocrystalline gradient cemented carbide on the surface, which specifically includes the following steps:

[0061] Step 1: prepare raw materials, the mass percentage of raw materials is: V(C 0.5 N 0.5 )6wt%, Co 8wt%, (Ta, Nb)C4wt%, Cr 3 C 2 0.2wt%, carbon black 0.4wt%, the rest is WC.

[0062] Step 2: After mixing the raw materials, put them into a wet ball mill for wet grinding, the ball milling ratio is 6:1, the ball milling medium is absolute ethanol, the speed is 150r / min, and the ball milling time is 90h;

[0063] Step 3: Drying and sieving is the same as Step 3 in Exa...

Embodiment 3

[0067] In this example, VN is used as the grain inhibitor and the gradient forming component to prepare the surface layer rich WC nanocrystalline gradient cemented carbide, including the following steps:

[0068] The ultrafine powder WC, VN, Co, and (Ta, Nb)C are used as raw materials, mixed by ball milling, dried and sieved. Spark plasma sintering and vacuum sintering are used to prepare WC-rich nanocrystalline gradient cemented carbide on the surface, which specifically includes the following steps:

[0069] Step 1: preparing raw materials, the mass percentage of raw materials is: VN 2wt%, Co10wt%, (Ta, Nb)C 2wt%, Cr 3 C 2 0.5wt%, carbon black 0.5wt%, the rest is WC.

[0070] Step 2: Ball Mill Mixing

[0071] After mixing the raw materials, put them into a wet ball mill for wet milling, the ball milling ratio is 6:1, the ball milling medium is absolute ethanol, the rotating speed is 200r / min, and the ball milling time is 70h;

[0072] Step 3: Drying and sieving is the s...

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Abstract

The invention relates to a high-hardness surface layer rich in WC nanocrystal gradient cemented carbide and a preparation method thereof, and belongs to the field of cemented carbide material preparation. A high-hardness surface layer rich in WC nanocrystal gradient cemented carbide. The alloy is prepared from the following raw material components in mass percentage: 2 to 10% V (C1‑xNx), 6 to 15% Co, 0.2 to 0.8 %Cr3C2, 0~0.5% carbon black, 0~6% (Nb, Ta)C, the balance is WC, the sum of the mass percentages of each component is 100%, where x=0.2~1. The V(C1-xNx) used in the present invention is decomposed and dissolved in Co, and is adsorbed on the WC grain boundaries to inhibit the growth of crystal grains and will not produce other impurities. At the same time, V(C1‑xNx) can decompose at a lower decomposition temperature. The surface layer of the nanocrystalline gradient cemented carbide prepared by the invention has higher hardness and wear resistance, and the core has better toughness, which effectively improves the tool material performance.

Description

technical field [0001] The invention relates to a high-hardness surface-layer WC-rich nanocrystalline gradient hard alloy and a preparation method thereof, belonging to the field of hard alloy material preparation. Background technique [0002] Cemented carbide is a tool material prepared by powder metallurgy with high melting point and high hardness carbide as the matrix, cobalt-nickel-iron and other bonding metals as the bonding phase. Cemented carbide is a tool material commonly used in the machinery manufacturing industry due to its advantages of high hardness, high strength, and corrosion resistance. With the development of materials, the machining industry has higher and higher requirements for them, requiring higher hardness and wear resistance. [0003] With its high hardness and high strength, nanocrystalline cemented carbide shows superior performance during machining, and its ability to meet the processing requirements of new materials in modern processing indust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/02C22C1/05B22F3/105B22F3/10
CPCB22F3/1007B22F3/105B22F2003/1051B22F2998/10B22F2999/00C22C1/051C22C29/02B22F2009/043B22F2201/20B22F2207/03
Inventor 王凯张海燕许智峰王强周向葵刘久振
Owner NORTHEASTERN UNIV LIAONING
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