Abstract
Selective laser melting (SLM), used to fabricate metallic objects with high geometrical complexity, is currently of increasing interest to the fields of medicine and dentistry. SLM-fabricated products should have highly smooth surfaces to minimize the use of post-processing procedures such as finishing and polishing. This study investigated the effect of various laser process parameters (laser power, scan rate, and scan-line spacing) on the surface roughness of a Co–Cr dental alloy that was three-dimensionally (3D) constructed via SLM. Initially, a single-line formation test was used to determine the optimal laser power (200 W) and scan rate (128.6 mm/s) that resulted in beads with an optimal profile. During subsequent multi-layer formation tests, the 3D Co–Cr body with the smoothest surface was produced using a scan-line spacing of 100 μm. The findings of this study show that laser process parameters have crucial effects on the surface quality of SLM-fabricated Co–Cr dental alloys.
Highlights
Selective laser sintering (SLS), a rapid prototyping and manufacturing technology, was developed in the late 1980s and has been widely employed to produce products from almost any type of material [1]
The smoothest surface (Ra = 1.8 μm) was obtained when the scan-line spacing was 100 μm. These findings suggest that use of the optimal scan-line spacing results in an overlap ratio that is slightly more than 50%, which enhances surface quality of the 3D-printed Co–Cr alloy products
This technique may be applicable to Co–Cr dental alloys produced by Selective laser melting (SLM), and this possibility byneeds
Summary
Selective laser sintering (SLS), a rapid prototyping and manufacturing technology, was developed in the late 1980s and has been widely employed to produce products from almost any type of material [1]. During the SLM process, the alloy powders are completely melted by a laser, and subsequently undergo rapid solidification This process can be used to produce objects of high geometrical complexity [3]. A high power laser beam is directed on an alloy bed and programmed to fuse particles according to a computer-assisted design (CAD) file [4] This generates a thin metal layer [4]. The apposition of subsequent layers results in the production of the desired three-dimensional (3D) form [4] Using this technique, it is possible to fabricate medical and dental metallic devices of different shapes and sizes, directly from a CAD model [4]
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