SLS is called Selective Laser Sintering. SLS technology uses laser to irradiate the material powder and melt the special added materials to achieve the function of binder, so as to combine the metal powder to achieve metal printing.
SLM is called Selective Laser Melting. SLM technology is the technology that the metal powder is directly heated by the laser to melt completely in the cooling process.
The principle of these two technologies is to use the thermal effect of the laser beam, but because SLS and SLM laser work on different objects, they use different lasers. SLS technology is generally used in long wavelength (9.2-10.8 μ m) CO2 laser. In order to melt metal better, SLM technology needs to use laser beam with higher absorptivity of metal, so it generally uses Nd YAG laser (1.064 μ m) and fiber laser (1.09 μ m) with shorter wavelength.
From the material point of view, there is a big difference between the two technologies. In addition to the main metal powder, the materials used in SLS technology also need to add a certain proportion of binder powder. The binder powder is usually metal powder with low melting point or organic resin. SLM technology can make the material melt completely, so it usually uses pure metal powder. Because the powder of SLS technology is mixed powder, even if metal powder is used as binder, the strength of metal materials with low melting point is generally lower, so the strength of sintered parts of SLS technology is lower than that of parts with single metal material. In addition, the mechanical properties and forming accuracy of SLS sintered parts are worse than SLM due to the existence of voids.
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