Cobalt-based metallic ceramic alloy powder special for continuous wave fiber laser cladding

Abstract

The invention discloses a cobalt-based metallic ceramic alloy powder special for continuous wave fiber laser cladding. The cobalt-based metallic ceramic alloy powder comprises, by weight, 15-18% of aluminum oxide, 11-13% of titanium dioxide, 4-8% of calcium fluoride, 2-5% of cerium oxide, 2-4% of silicon nitride, 1-4% of antimony, 4-7% of boron and the balance cobalt base. By the cobalt-based metallic ceramic alloy powder, in the process of continuous wave fiber laser cladding, absorptivity of a metal piece for laser can be increased greatly, melting point is lowered, and a cladding layer which is compact in internal organizational structure and free of defects such as cracks, shrinkage cavities and bubbles can be formed on the surface of the metal piece, so that service life of the metal piece is prolonged greatly, and production cost is lowered.

Description

technical field [0001] The invention discloses a cermet alloy powder, in particular a cobalt-based cermet alloy powder specially used for continuous wave optical fiber laser cladding. Background technique [0002] Laser has the characteristics of high brightness, high directionality, high monochromaticity and high coherence, and is now being used in more and more fields, among which laser cladding is one of the surface treatment technologies. In a nutshell, the principle of laser cladding is to irradiate the surface of the metal material with a high-energy laser beam, so that the surface of the substrate is melted rapidly, and the liquid metal forms a small-scale molten pool, and at the same time, new powder materials are filled. In the process, the original metal material is mixed with the added powder to form a new layer of liquid metal. After the laser beam scans, the liquid metal layer cools down rapidly to form a solid cladding layer on the metal surface. [0003] How...

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Problems solved by technology

The cladding layer is prone to defects such as cracks, shrinkage porosity, shrinkage cavities, and pores, and the hardness and strength of the cladding layer often cannot meet the production requirements

For example, the content of boron and silicon in most self-fluxing alloy powders is relatively high, so that some inclusions such as borosilicate during the laser cladding process cannot smoothly float out of the rapidly solidified molten pool, resulting in cracking sensitivity of the laser cladding layer Large, the cracking phenomenon is particularly obvious when the hardness of the laser cladding layer is high

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