Laser cladding nozzle and laser cladding device and laser cladding method

Abstract

The invention provides a laser cladding nozzle and a laser cladding device and a laser cladding method, and relates to the technical field of laser cladding. The laser cladding nozzle comprises a nozzle outer sleeve, a nozzle wick and a protective cover, the nozzle wick is sleeved with the nozzle outer sleeve, the nozzle outer sleeve is sleeved with the protective cover, and a powder feeding channel is formed between the nozzle outer sleeve and the nozzle wick; the protective cover comprises an inner layer, a middle layer and an outer layer, the inner layer, the middle layer and the outer layer are sequential distributed from inside to outside, a first cavity body is formed between the inner layer and the middle layer, and a second cavity body is formed between the middle layer and the outer layer; and a first liquid inlet opening and a first liquid outlet opening communicating with the second cavity body are formed in the outer layer, a first air inlet opening communicating with the first cavity body is further formed in the outer layer, and a first air outlet opening communicating with the first cavity body is formed in the inner layer. The laser cladding nozzle and the laser cladding device and the laser cladding method have functions of inert gas shielding and self-cooling, can well meet requirements of a laser cladding technology, and promote the quality of laser cladding.

Description

technical field [0001] The present invention relates to the technical field of laser cladding, in particular to a laser cladding nozzle and a laser cladding nozzle for laser cladding on the surface of magnesium, aluminum, titanium and their alloys represented by low melting point and high active materials. Device and laser cladding method. Background technique [0002] Laser cladding technology is a typical representative of laser surface treatment technology. It can prepare various alloy coatings or ceramic reinforced metal matrix composite layers on different metal substrates. The metal substrate after laser cladding treatment has smooth coating, uniform and dense structure. , layer-base metallurgical combination, wide range of performance adjustment, etc., can significantly improve the surface hardness, corrosion resistance and wear resistance of the substrate. [0003] Laser cladding technology uses the method of powder spreading or powder feeding to preset metal powder...

AI Technical Summary

Problems solved by technology

[0004] However, when laser cladding is performed on the surface of highly active metal substrates, due to its high chemical activity, it is very easy to react violently with active gases such as oxygen, nitrogen, and hydrogen in the air under high temperature, and as the temperature increases, its The chemical activity increases rapidly, and can strongly absorb various gases in the solid state. The absorbed gas atoms are solid-solved in the lattice in the form of interstitial or replacement, which changes the original lattice arrangement of the material, and is easy to form intercrystalline compounds, making The plasticity and toughness of the coating drop sharply, seriously deteriorating the comprehensive performance of the material

For example, during laser cladding on the surface of magnesium-lithium alloy, due to the extremely high chemical activity and extremely low melting point of lithium and magnesium elements, it is almost impossible to directly carry out the laser cladding process on the surface

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