Core-shell structure casting tungsten carbide particle welding wire and preparation method thereof

A technology of tungsten carbide particles and casting tungsten carbide, applied in welding equipment, welding media, manufacturing tools, etc., can solve the problems affecting the wear resistance of the surfacing layer, poor high temperature oxidation resistance, serious particle decomposition, etc. Good performance, good wear resistance and low cost of raw materials

Inactive Publication Date: 2019-11-01
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, two problems were found in the research. First, sintered tungsten carbide is mainly composed of WC, which has high purity but high cost, while cast tungsten carbide is relatively low in cost but mainly contains WC and W. 2 C
Compared with single-phase WC particles, WC/W 2 C has higher hardness and toughness and is cheaper, but the decomposition

Method used

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  • Core-shell structure casting tungsten carbide particle welding wire and preparation method thereof
  • Core-shell structure casting tungsten carbide particle welding wire and preparation method thereof

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preparation example Construction

[0031] A preparation process for casting tungsten carbide particle welding wire with a core-shell structure, comprising the following steps:

[0032] 1) The main component of cast tungsten carbide is WC / W 2 C p , the cast tungsten carbide particles are subjected to the surface carburizing process, the cast tungsten carbide, alloy powder, mechanical binder and carbon black are mixed, heated to 1500-1900°C under vacuum, kept for 2-3 hours, and modified to form a core-shell structure , after modification, a single-layer sintered tungsten carbide shell will be formed outside the cast tungsten carbide particles, with an average thickness of 3-12 μm, and a core-shell structure cast tungsten carbide particle welding core will be obtained;

[0033] 2) In step 1), the core-shell structure cast tungsten carbide particle welding core is covered with seam coating or seamless coating, and the welding wire skin is prepared by drawing or extrusion, and the final diameter range is 1.0~ 2.0m...

Embodiment 1

[0037] The outer skin is made of copper alloy, and the composition of the drug core is: cast tungsten carbide particles, according to the particle size, the proportion is 50-80 mesh, accounting for 30%, and the proportion of 80-200 mesh is 70%. The cast tungsten carbide accounts for 70%, the mixture of ferromanganese powder, nickel powder, niobium powder and silicon iron powder accounts for 28%, organic resin accounts for 2%, and the flux core accounts for 70-80% by weight of the welding wire. Among them, the effect is the best when spherical nickel powder is used as the binder. The result of the three-body wear test of SiC particles in this embodiment shows that the wear resistance of the clad wear-resistant layer is 30-40% higher than that of the existing similar welding wire.

Embodiment 2

[0039] The outer skin is made of cobalt alloy, and the composition of the drug core is: cast tungsten carbide particles, according to the particle size, the proportion is 35% for 50-80 mesh, and 65% for 80-200 mesh. The cast tungsten carbide accounted for 80%, the mixture of ferromanganese powder, nickel powder, niobium powder and silicon iron powder was 19%, and organic resin was 1%. ~80%. Among them, the effect is the best when spherical nickel powder is used as the binder. The result of the three-body wear test of SiC particles in this embodiment shows that the wear resistance of the clad wear-resistant layer is 10-30% higher than that of the existing similar welding wire.

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Abstract

The invention provides a core-shell structure casting tungsten carbide particle welding wire and a preparation method thereof. The core-shell structure casting tungsten carbide particle welding wire comprises an outer skin and a flux core, the flux core is a core-shell structure tungsten carbide welding core, a small amount of alloy powder and an organic binding agent, the cast tungsten carbide, the alloy powder, the organic binding agent are mixed with carbon black and then perform heat preservation and modification to form a core-shell structure after modification, a single-layer sintered tungsten carbide shell layer is formed outside cast tungsten carbide particles to obtain the core-shell structure casting tungsten carbide particle core, and the outer skin supporting welding wire is wrapped. According to the core-shell structure casting tungsten carbide particle welding wire, the cost is effectively reduced, hard tungsten carbide particles in a surfacing layer do not easily fall off, and the hardness and wear resistance of a clad welding layer are effectively improved. The core-shell structure casting tungsten carbide particle welding wire is applied to surfacing repair of wornparts of chemical equipment and various mechanical equipment.

Description

technical field [0001] The invention belongs to the technical field of welding consumables, and in particular relates to a cast tungsten carbide particle welding wire with a core-shell structure and a preparation method thereof. Background technique [0002] It is urgent to solve the surfacing welding repair of chemical equipment and various mechanical equipment wear parts, and to improve their performance and service life. At present, cast tungsten carbide particles are generally used to strengthen iron-based composite materials in wear-resistant composite materials that have been studied more. This is because cast tungsten carbide particles can be completely wetted with high-temperature molten iron, making the material easy to form and process and stable in quality. Common welding wire filler materials are sintered tungsten carbide particles, cast tungsten carbide particles, or a mixture of the two particles. However, two problems were found in the research. First, sinter...

Claims

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Application Information

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IPC IPC(8): B23K35/368B23K35/40
CPCB23K35/0266B23K35/3601B23K35/368B23K35/406
Inventor 孙良李霄闫刚翟文彦董会陈斐
Owner XI'AN PETROLEUM UNIVERSITY
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