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Non-magnetic hard alloy powder and method for preparing the same

A technology of cemented carbide and hard phase powder, which is applied in the field of non-magnetic cemented carbide powder and its preparation, can solve problems such as difficulty in adapting to high temperatures, and achieve the effects of improved corrosion resistance, good fluidity, and high agglomeration density

Inactive Publication Date: 2009-08-26
宋爽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the non-magnetic hard alloy coatings prepared by thermal spraying of non-magnetic hard alloy powders developed in the early stage or the non-magnetic hard alloy parts prepared by traditional powder metallurgy methods are difficult to adapt to harsh working conditions such as high temperature, high wear and strong corrosion.

Method used

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  • Non-magnetic hard alloy powder and method for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1 Atomization

[0030] The nickel, molybdenum metal or nickel-molybdenum alloy block is placed in the smelting furnace according to the required alloy ratio (the Mo content is 6-15wt%), and the alloy solution is smelted for gas atomization. The inert gas used for gas atomization is nitrogen, and the gas pressure is controlled between 1.5 and 2.5 MPa. Afterwards, the produced nickel-molybdenum non-magnetic binder phase alloy powder is sieved.

[0031] 2 mix

[0032] Nickel-molybdenum alloy powder with a particle size range of 2.5-38 μm is selected as the binder phase powder, and tungsten carbide with a particle size range of 1.25-25 μm is used as the hard phase powder. The mass ratio of nickel-molybdenum alloy powder is 12-17%, and tungsten carbide is the balance. The two powders are mixed and ball milled, the ball milling medium is alcohol, the ball, material and medium ratio in the ball milling is 3:1:1, and the ball milling time is 12 hours.

[0033] 3 Spray dryin...

Embodiment 2

[0038] 1 Atomization

[0039] Put nickel, molybdenum metal or nickel-molybdenum alloy in the smelting furnace according to the required alloy ratio (Mo content is 15-25wt%), and vacuum atomize after smelting into alloy solution. Afterwards, the produced nickel-molybdenum non-magnetic binder phase alloy powder is sieved.

[0040] 2 mix

[0041] Nickel-molybdenum alloy powder with a particle size range of 38-106 μm is selected as the binder phase powder, and chromium carbide with a particle size range of 1.25-25 μm is used as the hard phase powder. The mass ratio of nickel-molybdenum alloy powder is 12-17%, and chromium carbide is the balance. The two powders were mixed and ball milled. The ball milling medium is alcohol, the ratio of balls, material and medium in the ball milling is 3:1:1, and the ball milling time is 24 hours.

[0042] 3 Spray drying

[0043]The ball-milled powder is stirred for 20 to 30 minutes according to the ratio of material, polyvinyl alcohol and al...

Embodiment 3

[0047] 1 Atomization

[0048] Put nickel, chromium, molybdenum metal or alloy in the melting furnace according to the following ratio (wt%): Cr 5-18, Mo 1-10, Ni balance. After smelting into an alloy solution, water atomization is carried out, and the atomization pressure is 20-40MPa. Afterwards, the produced nickel-chromium-molybdenum non-magnetic binder phase alloy powder is sieved.

[0049] 2 mix

[0050] The nickel-chromium-molybdenum alloy powder with a particle size range of 38-106 μm is selected as the binder phase powder, and the particle size range is 25-75 μm, containing 10-20wt% Cr 3 C 2 The mixture of tungsten carbide and chromium carbide is hard phase powder. The mass ratio of nickel-chromium-molybdenum alloy powder is 17-25%, and the mixture of tungsten carbide and chromium carbide is the balance. The three powders were mixed and ball milled. The ball milling medium is alcohol, the ratio of balls, material and medium in the ball milling is 3:1:1, and the ba...

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Abstract

The invention relates to a non-magnetic hard alloy powder and a method for preparing the same. The non-magnetic hard alloy powder is formed by adopting nickel-molybdenum alloy powder or nickel-chromium-molybdenum alloy powder as a binder phase, adopting tungsten carbide or chrome carbide or the mixture of the two as a hard phase, conglobating, spray drying, pelletizing and finally sintering the two phases. The non-magnetic hard alloy powder can be used for preparing non-magnetic hard alloy coating via thermal spraying process or for making non-magnetic hard alloy components in a powder metallurg method.

Description

technical field [0001] The invention relates to a non-magnetic hard alloy powder and a preparation method thereof. The powder material is suitable for preparing non-magnetic hard alloy coatings on surfaces such as molds by thermal spraying (high-speed flame spraying, plasma spraying or ordinary flame, etc.), and is also suitable for Non-magnetic hard alloy parts are prepared by sintering in powder metallurgy process. Background technique [0002] 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-magnetic materials in a certain direction. In the past 20 years, in addition to using non-magnetic steel (such as 1Cr18Ni9Ti, 70Mn, 9Mn9, etc.) to produce such non-magnetic molds, people have also developed and applied WC-Ni non-magnetic hard alloys to produce such ...

Claims

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Application Information

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IPC IPC(8): C22C29/02C22C29/08C22C30/00C22C19/03C22C19/05C22C1/05
Inventor 宋爽
Owner 宋爽
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