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

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...

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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 of particles is more serious, which affects the wear resistance of the surfacing layer

The main disadvantage of tungsten carbide is its poor resistance to high-temperature oxidation. It is severely oxidized in the air at 500-800°C, and it is easily decomposed into W by strong heat in an oxidizing atmosphere. 2 C and carbon, the so-called "loss of carbon"

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