Question

Identify the correct statement among the following:

• A. Blending refers to the mixing of different metal or alloy powders of same size distributions
• B. Presence of residual porosity is one of the advantage of powder metallurgy for self-lubrication
• C. Undercuts on the horizontal plane (perpendicular to the pressing direction) can be produced by powder metallurgy process.
• D. Multiple punches are required to achieve uniform compacting of powder metallurgy parts

Answer 1

The correct option is D Multiple punches are required to achieve uniform compacting of powder metallurgy parts

The presence of residual porosity leads to a low density part which is undesirable from the part strength point of view. Similarly it is impossible to produce uniform thickness of parts with a single punch. So in order to obtain uniform thickness multiple punches are required.