ME 381 Module 5 Quiz questions
Which one of the following most closely typifies the sintering temperatures used in powder metallurgy? (Tm is the melting point of the metal on the absolute scale)
0.8 Tm
A powder can be defined as a finely divided particulate solids
True
Powder metal part shaping operations are generally considered to be net shape or near net shape processes
True
Sintering operation consists of three steps: 1) preheat, 2) sinter, and 3) cool-down
True
A common of measure of interparticle friction among particulates is the..........
angle of repose
As particle size increases, interparticle friction...?
decreases
Packing factor is.....
bulk density divided by true density
After pressing in the press and sinter PM sequence, the work part is called which one of the following?
green compact
The primary driving force for sintering is
reduction of surface energy
For a given weight of metallic powders, the total surface area of the powders is increased by which of the following?
smaller particle size
The principal mechanism by which sintering occurs is....
solid-state diffusion
Which of the following powder shapes would tend to have the lowest interparticle friction?
spherical