Question

binder jetting: metal
use the information below to answer the question.
the metal and sand material used in the binder jetting process are very similar. the most commonly used metal is a stainless steel powder. this powder material is best used for prototypes and aesthetic pieces.
the other metal material that is available is a stainless steel metal combined with a bronze infiltration. in this process, the bronze material is used to fill in the porous spaces throughout the print and will create a more functional part.
after the printer has finished creating the form and the metal part is taken out of the powder bin, the print will be solid, but the process is still not fully complete. at this point, the print is in the green form. this is when the binding agent solidifies, but the metal has not been melted together. the rest of the process includes the print being put into an oven to be sintered and melted together.
after the print is removed from the oven, some shrinkage and internal stress can occur on fine/thin pieces.
after the final sintering process, the print is removed from the oven and cooled. at this point, the print will be too porous to be used as a functional piece and the surface will have a grainy feel. however, this issue can be remedied with an additional treatment.
if the print needs to fulfill a functional application, a bronze material will be poured into the part. this will fill in the porous spots of the print, creating a part with a hybrid combination of metals.
if you have printed parts using a stainless steel powder in the binder jetting process, how could you strengthen the finished prints?
use a bronze material to fill in the porous spots of the prints
add an extra coating of resin to the prints
place the prints into an oven to cure it for a longer period of time

Explanation:

The text clearly states that using a bronze material to fill in the porous spots of the print (which is made of stainless - steel powder in Binder Jetting) creates a more functional part. Adding resin coating is not mentioned in the text as a strengthening method for stainless - steel powder prints. Placing the prints in the oven for a longer time is part of the sintering process but not specifically stated as a way to strengthen the print in the context of the question (the text focuses on bronze infiltration for strengthening in the relevant part).

Answer:

use a bronze material to fill in the porous spots of the prints