Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 24 Cited by
  • 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 WC-Ni in recent years. 3 C 2 The addition of these additives is mainly to make the binder phase in this material become a non-magnetic phase such as Ni-W-Al, Ni-Cr-Al, etc., but in actual production, factors such as the diffusion of binder phase elements are difficult to control , so that the performance of the final product cannot meet the expected physical and mechanical performance requirements
[0007] How to solve the above process difficulties, there is no clear report at present, especially in the preparation of non-magnetic cemented carbide powder for thermal spraying with nickel-tungsten and nickel-chromium alloy alloys as bonding properties, there is no data report at home and abroad

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

preparation example Construction

[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 smelting furnace according to the weight percentage of the required alloy powder (the vacuum atomization will be in the vacuum smelting furnace) 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-tungsten and nickel-chromium 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 powders Particle size segment: such as 104-2.5 μm, 74-2.5 μm, or 38-2.5 μm.

[0025] 2 mix

...

Embodiment 1

[0040] 1 atomization

[0041] The nickel and tungsten metals are placed in a smelting furnace with a mass ratio of 4:1, smelted into an alloy solution, and then subjected to ordinary gas atomization. The inert gas 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] Nickel-tungsten alloy powder with a particle size of less than 30 μm (with a W content of 15 to 20 wt%) is selected as the binder phase powder, and 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.

[0044] 3 spray drying

[0045] The ball-milled powder is stir...

Embodiment 2

[0049] 1 atomization

[0050] The nickel and tungsten metals are placed in a melting furnace at a mass ratio of 4:1, smelted into an alloy solution, and then subjected to ordinary gas atomization. The inert gas 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]Nickel-tungsten alloy powder with a particle size of less than 30 μm (with a W content of 15 to 20 wt%) is selected as the binder phase powder, and 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.

[0053] 3 spray drying

[0054] The ball-milled powder is stirred ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Graininessaaaaaaaaaa
Graininessaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B22F1/00B22F9/04B22F9/08
Inventor 宋爽王哲
Owner 宋爽
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com