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Non magnetic cemented carbide powder with nickel-vanadium alloys as binder phase and preparation

A nickel-vanadium alloy and cemented carbide technology is applied in the field of non-magnetic cemented carbide powder for thermal spraying and its preparation, which can solve the problems of large mold volume, difficulty in controlling carbon content, easy cracking and deformation, etc. , the effect of high agglomeration density and good fluidity

Inactive Publication Date: 2008-09-10
王哲 +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, the large-volume non-magnetic cemented carbide mold is easy to crack and deform during degumming and sintering.
[0006] In order to reduce the difficulty of producing WC-Ni non-magnetic hard alloy, people have added VC, Cr3C2 and other additives to WC-Ni in recent years. The addition of these additives is mainly to make the binder phase in this material become N-V-W , Ni-Cr-W and other non-magnetic phases, but in actual production, factors such as the diffusion of binder phase elements are difficult to control, so that the final product cannot meet the expected physical and mechanical performance requirements in terms of performance.
[0007] How to solve the above process difficulties, there is no clear report at present, especially in the use of nickel-vanadium alloys as bonding non-magnetic cemented carbide powder for thermal spraying and its preparation, there is no data report at home and abroad

Method used

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  • Non magnetic cemented carbide powder with nickel-vanadium alloys as binder phase and preparation
  • Non magnetic cemented carbide powder with nickel-vanadium alloys as binder phase and preparation
  • Non magnetic cemented carbide powder with nickel-vanadium alloys as binder phase and preparation

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Experimental program
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preparation example Construction

[0022] 1 Preparation of nickel-vanadium alloy binder phase powder

[0023] Metals or alloys such as nickel, vanadium, chromium, etc. 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 atomized. Inert gas nitrogen or argon is used for vacuum atomization or ordinary gas atomization. The atomization gas pressure is generally controlled between 1.5-2.5MPa; the water atomization pressure is controlled at 20-40MPa. Non-magnetic nickel-vanadium alloy powders with a particle size of 104-2.5 μm can be produced by the above-mentioned smelting and atomization process. According to customer requirements, the non-magnetic alloy powder produced by the above-mentioned process can be sieved into different powder particle sizes. Segment: such as 104-2.5 μm, 74-2.5 μm, or 38-2.5 μm.

[0024] 2 mix

[0025] The nickel-vanadium alloy non-magnetic bonding ...

Embodiment 1

[0038] 1 atomization

[0039] The nickel and vanadium metals are placed in a vacuum melting furnace at a mass ratio of 9:1, smelted into an alloy solution, and vacuum atomized. 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-vanadium non-magnetic binder phase alloy powder is sieved.

[0040] 2 mix

[0041] The nickel-vanadium alloy powder (with a V content of 8 to 10wt%) with a particle size of less than 30 μm is selected as the binder phase powder, and the tungsten carbide with a particle size of less than 2.7 μm is used as the hard phase powder. The mass of the two powders accounts for 12% and 88% respectively. Then carry out mixing ball milling. The ball milling medium is absolute ethanol, the ratio of balls, material and medium in the ball milling is 3:1:1, and the ball milling time is 48 hours.

[0042] 3 spray drying

[0043] The ball-milled powder is stirred for 20 to ...

Embodiment 2

[0047] 1 atomization

[0048] The nickel and vanadium metals are placed in a vacuum melting furnace at a mass ratio of 9:1, smelted into an alloy solution, and vacuum atomized. 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-vanadium non-magnetic binder phase alloy powder is sieved.

[0049] 2 mix

[0050]The nickel-vanadium alloy powder (with a V content of 8-10wt%) with a particle size of less than 30 μm is selected as the binder phase powder, and the tungsten carbide with a particle size of less than 2.7 μm is used as the hard phase powder. The mass of the two powders accounts for 20% and 80% respectively. Then carry out mixing ball milling. The ball milling medium is absolute ethanol, the ratio of balls, material and medium in the ball milling is 3:1:1, and the ball milling time is 48 hours.

[0051] 3 spray drying

[0052] The ball-milled powder is stirred for 20 to 30 m...

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Abstract

The invention relates to a non-magnetic hard alloy powder for heat spraying which is constituted by taking nickel-vanadium alloys as the binding phase and a preparation method. The preparation of the non-magnetic hard alloy powder for heat spraying is formed by taking nickel-vanadium alloy powder, nickel-vanadium-aluminum alloy powder or nickel-vanadium-chromium alloy power as the binding phase, taking tungsten carbide plus chromium carbide as the hard phase and carrying out clustering or spray drying and sintering. A coating which is prepared by using the non-magnetic hard alloy powder can improve and enhance multiple functions and the service life of a plurality of mechanical parts which require the non-magnetic or anti-magnetic and magnetic isolated work environment.

Description

technical field [0001] The non-magnetic cemented carbide powder for thermal spraying and the preparation method of the present invention are composed of metal nickel-vanadium alloys as the binder phase. The technical fields involved are: thermal spraying engineering technical field, thermal spraying material engineering field, powder metallurgy material field , 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. technical background [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 production, which requires the forming mold to use non-ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04B22F9/08
Inventor 王哲宋爽
Owner 王哲
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