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