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The ASTM International F42 standards committee has grouped selective laser melting into the category of "laser sintering", although this is an acknowledged misnomer because the process fully melts the metal into a solid homogeneous fully dense mass, unlike selective laser sintering (SLS) which is a true sintering process.
An SLS machine being used at the Centro de Pesquisas Renato Archer in Brazil.. Selective laser sintering (SLS) is an additive manufacturing (AM) technique that uses a laser as the power and heat source to sinter powdered material (typically nylon or polyamide), aiming the laser automatically at points in space defined by a 3D model, binding the material together to create a solid structure.
selective laser melting (SLM) or direct metal laser sintering (DMLS), ... Another 3D printing approach is the selective fusing of materials in a granular bed. [30]
This technology was first developed at the Massachusetts Institute of Technology and patented in 1993. In 1996, the ExOne Company was granted an exclusive field-of-use patent for the technology, [2] while Z Corporation, which was later acquired by 3D Systems, [3] obtained a non-exclusive patent for use of the technology for metal casting purposes. [4]
As with selective laser melting, the laser power does not have to be especially high as long as the laser energy is sufficiently concentrated.The achievable rate of material addition depends on both the amount of laser power applied, and the heat of fusion of the feedstock and substrate materials.
Another commonly used method is fused deposition modeling (FDM), in which a moving head creates a layer by melting the model material (usually a polymer) and extrudes the melted material onto a surface. Other methods such as selective laser sintering (SLS) are also used in the additive manufacturing of 3D microstructures. [1]
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