Question

bj: post - processing
use the information below to answer the question.
with binder jetting, many of the post - processing procedures are done at the facility that did the printing.
the first thing that happens after printing is that the print must remain in the powder bed so that it hardens. once it is taken out of the bed, the excess powder is removed with a high - pressure air blast.
sand
if the object is a full - color sand print, the process is complete when the excess powder is removed. however, a dye can still be added for additional color. an infiltration process can also be added to the post processing to add more mechanical structure to the print. this is done by adding a clear coat to the print which can help it feel smoother and protect it. when a sand print is to be used as a mold, there are secondary burn - outs to give it a better binding as well.
metals
sintering is a requirement for metal parts. this sintering is done with the use of an oven for binder jetting (bj) metal parts. once this has been done, the process is complete. the pieces can be post - processed with a bronze infiltration to give it better mechanical properties.
what does an infiltration process add to binder jetting (bj) sand prints?
heat resistance
a more geometric shape
additional color
a more mechanical structure

Explanation:

The text states that an infiltration process can be added to post - processing to add more mechanical structure to the part by adding a clear coat.

Answer:

a more mechanical structure