Non-magnetic cemented carbide powder composed of nickel-tungsten and nickel-chromium binder phase and preparation

A technology of cemented carbide and hard phase powder, which is applied in the field of non-magnetic cemented carbide powder and coating preparation for thermal spraying, can solve the problems of large mold volume, difficult control of carbon content, easy cracking and deformation, etc. High bonding strength, high agglomeration density and good fluidity

Inactive Publication Date: 2008-08-13
宋爽 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the production of WC-Ni non-magnetic cemented carbide, the carbon zone in the two-phase alloy required for non-magnetism is narrow, which makes it extremely difficult to control the carbon content in production.
[0005] It is difficult to produce large-volume (more than 10kg) WC-Ni non-magnetic cemented carbide molds
This is due to the large volume of the mold, and the carbon content inside and outside the mold is not easy to control uniformly
In addition, large-volume non-magnetic cemented carbide molds are prone to cracking and deformation during degumming and sintering
[0006] In order to reduce the difficulty of producing WC-Ni non-magnetic hard alloys, people have added Cr, Al, Cr to

Method used

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  • Non-magnetic cemented carbide powder composed of nickel-tungsten and nickel-chromium binder phase and preparation
  • Non-magnetic cemented carbide powder composed of nickel-tungsten and nickel-chromium binder phase and preparation

Examples

Experimental program
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Example Embodiment

[0023] 1 Preparation of nickel-tungsten and nickel-chromium alloy binder phase powder

[0024] Metals or alloys such as nickel, tungsten, chromium and aluminum are placed in a melting furnace (vacuum atomization will be in a vacuum melting furnace) according to the weight percentage of the required alloy powder to melt into an alloy solution and then atomize. Inert gas nitrogen or argon is used for vacuum atomization or ordinary gas atomization. The atomization gas pressure is generally controlled between 1.5 and 2.5 MPa; the water atomization pressure is controlled between 20 and 40 MPa. The above-mentioned smelting and atomization process can produce non-magnetic nickel-tungsten and nickel-chromium alloy powder with a particle size of 104~2.5μm. According to customer requirements, the non-magnetic alloy powder produced by the above process can be sieved into different powders. Granularity segment: such as 104~2.5μm, 74~2.5μm, or 38~2.5μm.

[0025] 2 mix

[0026] The above-mentio...

Example Embodiment

[0039] Example 1

[0040] 1 atomization

[0041] The nickel and tungsten metals are placed in a smelting furnace at a mass ratio of 4:1, smelted into an alloy solution, and then subjected to ordinary gas atomization. The inert gas used for atomization is nitrogen, and the gas pressure is generally controlled between 1.5 and 2.5 MPa, and then the produced nickel-tungsten non-magnetic binder phase alloy powder is screened.

[0042] 2 mix

[0043] Choose nickel-tungsten alloy powder with a particle size of less than 30μm (W content of 15-20wt%) as the binder phase powder, and tungsten carbide with a particle size of less than 2.7μm as the hard phase powder. The mass of the two powders is 12% and 88% respectively. Afterwards, it is mixed with ball milling. The ball milling medium is anhydrous ethanol, the ball, material, and medium ratio in the ball mill is 3:1:1, and the milling time is 48 hours.

[0044] 3 spray drying

[0045] The powder after ball milling is mixed according to the...

Example Embodiment

[0048] Example 2

[0049] 1 atomization

[0050] The nickel and tungsten metals are placed in a smelting furnace at a mass ratio of 4:1, smelted into an alloy solution, and then subjected to ordinary gas atomization. The inert gas used for atomization is nitrogen, and the gas pressure is generally controlled between 1.5 and 2.5 MPa, and then the produced nickel-tungsten non-magnetic binder phase alloy powder is screened.

[0051] 2 mix

[0052]Select nickel-tungsten alloy powder with a particle size of less than 30μm (W content of 15-20wt%) as the binder phase powder, and tungsten carbide with a particle size of less than 2.7μm as the hard phase powder. The mass of the two powders is 20% and 80% respectively. Afterwards, it is mixed with ball milling. The ball milling medium is anhydrous ethanol, the ball, material, and medium ratio in the ball mill is 3:1:1, and the milling time is 48 hours.

[0053] 3 spray drying

[0054] The powder after ball milling is mixed according to the ...

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Abstract

The invention relates to nonmagnetic hard alloy powder made of nickel-tungsten, nickel-chromium agglutinate phases, and a producing method thereof. The nonmagnetic hard alloy powder is produced by using nickel-tungsten alloy powder, nickel-tungsten-chromium alloy powder, nickel-chromium alloy powder or nickel-chromium-aluminum alloy as agglutinate phases, using wolfram carbine or wolfram carbine+chromium carbide as a hard phase, then agglomerating or spray drying, and sintering. By using the nonmagnetic hard alloy powder, nonmagnetic hard alloy coats and nonmagnetic hard alloy parts can be produced.

Description

technical field [0001] The non-magnetic cemented carbide powder for thermal spraying and the coating preparation method of the present invention are composed of metal nickel-tungsten and nickel-chromium alloys as the binder phase. The technical fields involved are: thermal spraying engineering technical field, thermal spraying material engineering field, The field of powder metallurgy materials, the field of non-magnetic hard alloy materials, etc. [0002] The powder material is not only suitable for preparing non-magnetic hard alloy coatings by thermal spraying (high-speed flame spraying, plasma spraying or ordinary flame, etc.), but also suitable for preparing non-magnetic hard alloy parts by powder metallurgy sintering. Background technique [0003] In the field of modern industry, magnetic materials have become important basic materials. In order to obtain high-performance permanent magnet materials, it is required to press under a strong magnetic field during productio...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/04B22F9/08
Inventor 宋爽王哲
Owner 宋爽
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