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Analysis on the application status and prospect of laser cladding materials

Analysis on the application status and prospect of laser cladding materials

  • Categories:Industry news
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  • Time of issue:2020-09-03 13:09
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(Summary description)For many years, the powder system used in laser cladding has been using thermal spray powder materials. Many scholars believe that laser cladding by means of thermal spray powder is unscientific.

Analysis on the application status and prospect of laser cladding materials

(Summary description)For many years, the powder system used in laser cladding has been using thermal spray powder materials. Many scholars believe that laser cladding by means of thermal spray powder is unscientific.

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2020-09-03 13:09
  • Views:
Information

Over the years,Laser claddingthe powder system used has always been thermal spray powder materials,many scholars thinkthat use thermal spray powder onlaser claddingis unscientific。

 

Laser cladding application status of materials

 

Thermal spray powder is designed to flow due to small changes in temperature during spraying. The designed thermal spray alloy composition often has a wide solidification temperature range. This type of alloy is directly applied to laser cladding it will cause pore problems due to poor fluidity.

 

A higher content ofBandSielementsare added to the thermal spray powder.On the one hand, it reduces the melting point of the alloy; on the other hand, it acts as a deoxidizer to reduce metal oxides to generate low-melting borosilicate, which plays a role of deoxidation and slagging.

 

Compared with thermal spraying, the life of the laser molten pool is shorter. This low-melting borosilicate often has no time to float on the surface of the molten pool and remains in the cladding layer, forming a liquid film during the cooling process, which aggravates the cracking of the coating. Or make inclusions in the cladding layer.

 

laser cladding materialsfuture prospects 

 

As to laser cladding application status of materialsproblems, the usual approaches mainly include the following:

 

  1. Adjust the composition based on the general thermal spray powder to reduce the expansion coefficient. Reduce as much as possible under the requirements of ensuring performanceB,SiC the content of other elements reduces the possibility of cracks in the cladding layer and the transition layer on the substrate surface.

 

  1. adding1this or several alloying elements can increase the toughness phase and improve the toughness of the coating on the basis of satisfying its performance, which can effectively inhibit the generation of hot cracks.

 

  1. Preheating and post heat treatment of the base material can reduce the temperature gradient, reduce the residual thermal stress, and help suppress the occurrence of cracks.

 

  1. Adding rare earth elements to powder materials can improve the strength and toughness of the material.

 

These waysalthough the process performance of the coating can be improved to a certain extent, it cannot solve the problem fundamentally. Therefore, we should start from the characteristics of the laser cladding process and combine the application requirements to develop a special powder suitable for laser cladding. This will become one of the important directions of laser cladding research.

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