Question

bj: materials and dimensional accuracy
use the information below to answer the question.
dimensional accuracy
for a full - color sand print, binder jetting (bj) is very dimensionally stable. it is about 100 microns. for a mold or core, it can vary between 240 and 380 microns, which is still very small.
with metal, there is a 50 - micron tolerance because there is no heat in the printing process. however, this can change when adding bronze to the piece, because it has to be heated in an oven or furnace. there can be up to a 2% change in shrinkage on the dimensional accuracy, so it is a little bit unpredictable.
materials
sandstone:

• stiff
• full color
• low function

stainless steel:

• optional bronze additive
• can be machined
• corrosion - resistant

inconel alloy:

• aerospace & automotive
• temperature resistant
• good mechanical properties
• high chemical resistance

tungsten carbide:
what type of binder jetting (bj) material is used for casting metal and is a refractory material?
sandstone
tungsten carbide
silica sand
inconel alloy

Explanation:

Silica sand is a refractory material (able to withstand high temperatures) and is commonly used in casting processes. Sandstone is not typically used for metal casting in this context. Tungsten carbide has different applications (like in tools for its hardness). Inconel alloy is more for aerospace/automotive due to its specific properties rather than being a main casting - refractory material for general metal casting like silica sand.

Answer:

silica sand