For powder bed fusion type of metal 3D printer, SLM (Selective Laser Melting) and EBM (Electron Beam Melting) are the major ones. The type of metal used and quality (such as tolerance and roughness) achieved can be different between SLM and EBM. If you can understand the both features, you can judge which type of 3D printer us suitable for your need.
|Heat source||EBM (Electron Beam Melting)||SLM (Selective Laser Melting)||KEY POINTS|
|Materials||Enables use of high melting-point material||Does not allow for use of high melting-point materials (and high reflection material, such as pure-copper)|
|Powder size||45~105μm||<45μm||Powder size difference due to power of heat source|
|Layer thickness||50~90μm||20~50μm||Layer thickness affect on forming time|
|Chamber tmosphere||Vacuumed / Preheated||Inert gas substituted||EBM requires preheat for temporary powder sintering LBM prevent oxidation by inert gas substitution|
|Surface||Inferior||Good||Surface is affected by powder size and layer thickness|
|Support（Stress-relief）||Simple（because of preheat）||Sturdy（due to ordinary temp.）||Lesser support make the process more economical in terms of post process (finishing) and yield|
By producing with EBM, production time can be significantly shortened, and a large cost reduction effect + short delivery time can be expected compared to LBM. Furthermore, EBM basically does not require heat treatment to relieve stress because production is conducted under a high temperature environment.
|No of peaces||LBM production time (h)
(Concept Laser M2-1st generation)
|EBM production time(h)
|Tensile strength（MPa）||Yield stress（MPa）||Elongation（%）|
*Parameters for further strength improvement is under development