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Hard alloy suitable for abrasive water jet nozzle and preparation method of hard alloy

A technology of cemented carbide and sand tubes, which is applied in the field of cemented carbide and its preparation, and can solve the problems of reducing the ability to resist abrasive wear and reduce wear resistance

Inactive Publication Date: 2018-05-22
株洲锐利诚切削工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, cemented carbide was commonly used for sand pipes, but because the presence of Co in cemented carbide significantly reduces wear resistance, and Ti significantly reduces the ability to resist abrasive wear, so a new one with ultra-high hardness and good abrasive wear resistance is developed. Sand pipe material is becoming more and more important

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 0.1% Mo by weight percentage is selected for use in batching 2 C powder, 0.2% TaC powder, 0.2% Cr 3 C 2 , the balance is WC powder with a Fischer particle size of 0.2 μm and a Hcp value of 55KA / m; anhydrous alcohol is used as the ball milling medium, the liquid-solid ratio is 450ml / Kg, the mass ratio of the ball to material is 8:1, and the ball milling time is 72 Hours, vacuum drying to obtain the mixture, molded, placed in a high-pressure sintering furnace at 1550 ° C for sintering, pressurized pressure of 80MPa. Take PS21 (size 6.5×5.25×20㎜) sample bar as a standard product for testing the cemented carbide prepared by the method in this example. The average WC grain size is 0.2 μm, the bending strength is 1800MPa, and the hardness Hv 30 2400.

Embodiment 2

[0017] It is 0.2% Mo by weight percentage for use in batching 2 C powder, 0.4% TaC powder, 0.3% Cr 3 C 2 , the balance is WC powder with a Fischer particle size of 0.2 μm and a Hcp value of 55KA / m; absolute alcohol is used as the ball milling medium, the liquid-solid ratio is 450ml / Kg, the ball-to-material ratio is 8:1, and the ball milling time is 66 hours , Vacuum drying to obtain the mixture, molded, placed in a high-pressure sintering furnace at 1600 ° C for sintering, pressurized pressure of 80MPa. Take PS21 (size 6.5×5.25×20㎜) sample bar as a standard product for testing the cemented carbide prepared by the method in this example. The average WC grain size is 0.25 μm, the bending strength is 1850 MPa, and the hardness Hv 30 2300.

Embodiment 3

[0019] When batching, it is 0.4% Mo by weight 2 C powder, 0.8% TaC powder, 0.4% Cr 3 C 2 , the balance is WC powder with a Fischer particle size of 0.2 μm and a Hcp value of 55KA / m; absolute alcohol is used as the ball milling medium, the liquid-solid ratio is 450ml / Kg, the ball-to-material ratio is 8:1, and the ball milling time is 60 hours. The mixture was obtained by vacuum drying, and after molding, it was placed in a high-pressure sintering furnace for sintering at 1650° C., and the pressurized pressure was 80 MPa. Take PS21 (size 6.5×5.25×20㎜) sample bar as a standard product for testing the cemented carbide prepared by the method in this example. The average WC grain size is 0.30 μm, the flexural strength is 1900 MPa, and the hardness Hv 30 2200.

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Abstract

The invention discloses a hard alloy suitable for an abrasive water jet nozzle and a preparation method of the hard alloy. The hard alloy suitable for the abrasive water jet nozzle comprises the following components in percentage by weight: 0.05-1.0% of Mo2C powder, 0.1-2.0% of TaC powder, 0.1-0.5% of Cr3C2 and the balance of WC powder, and the total percentage is 100%. By using the hard alloy, the abrasive wear resistance of an abrasive nozzle can be improved.

Description

technical field [0001] The invention relates to a cemented carbide suitable for a waterjet sand tube and a preparation method thereof. Background technique [0002] At present, water jet, which uses water as a knife, is called high-pressure water jet cutting technology. This technology originated in the United States and is used in the aerospace industry. It is favored for its cold cutting that does not change the physical and chemical properties of the material. After continuous improvement of technology, abrasives such as pomegranate sand and carborundum were mixed into high-pressure water to assist cutting, which greatly improved the cutting speed and cutting thickness of the water jet. Now waterjet has been widely used in ceramics, stone, glass, metal, composite materials and many other industries. [0003] The most critical factor that determines the processing quality and processing life in waterjet machining is the performance of the waterjet sand tube. Waterjet sa...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622
CPCC04B35/5626C04B35/622C04B2235/3839C04B2235/785C04B2235/96
Inventor 周悫昱
Owner 株洲锐利诚切削工具有限公司
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