Question

powder bed fusion technologies (pbf)
use the information below to answer the question.
powder bed fusion (pbf) only uses metal. there is no sand, plastic or polymer. powder bed fusion (pbf) is not a desktop technology, as its a big machine that uses a lot of heat. while selective laser sintering (sls) uses a bed of polymer powder, pbf uses a metal powder. pbf uses support material to help keep the print from warping. unlike binder jetting, the print is finished when its taken out of the powder box and does not need to be placed in a furnace.
there are two different powder bed technologies: direct metal laser sintering and selective laser melting.
direct metal laser sintering

• fuses the particles together
• there will be a 3d melt
• uses laser power

selective laser melting

• melts the parts together
• it creates a homogeneous part
• uses directional energy, such as a laser

which of the following are powder bed fusion (pbf) technologies?
fused filament fabrication and selective laser sintering
direct metal laser sintering and selective laser melting
binder jetting and material jetting
stereolithography and hot polymerization

Explanation:

The text mentions that there are two different powder - bed technologies: Direct Metal Laser Sintering and Selective Laser Melting, which are types of Powder Bed Fusion (PBF) technologies.

Answer:

Direct Metal Laser Sintering and Selective Laser Melting