Powder Metallurgy

What is Powder Metallurgy (PM)?

• A process of melting metals to create parts

• A technology for producing parts from metallic powders

• A method for forging metal parts

• A process of casting metal parts

What is the primary purpose of sintering in the PM process?

• To melt the metal powders

• To create a hard, rigid mass

• To bond the metal particles together

• To shape the metal powders

What percentage of starting powders is typically converted into the product in PM?

• About 70%

• About 85%

• About 97%

• About 50%

What is the distinction between open pores and closed pores in the context of metal powders?

• Open pores are external voids, while closed pores are internal voids within individual particles.

• Open pores are smaller than closed pores.

• Open pores have a major impact on density measurements, while closed pores do not.

What is the main disadvantage of PM regarding part geometry?

• Limited options for complex shapes

• High tooling and equipment costs

• Difficulty in storing metal powders

• Low dimensional control

What parameter defines the size of particles in a powder?

• Particle density

• Particle mesh count

• Particle aspect ratio

• Particle surface area

What is the typical range for particle sizes used in conventional powder metallurgy?

• 1-10 micrometers

• 25-300 micrometers

• 500-1000 micrometers

• 1000-2000 micrometers

What is the aspect ratio of a spherical particle?

• 1.0

• 2.0

• 0.5

• 3.0

What is the equation for the shape factor (Ks) used to determine surface area in PM?

• Ks = A / V

• Ks = V / D

• Ks = AD / V

• Ks = D / V

What does the packing factor represent in powder metallurgy?

• The density of the true volume of the material

• The density of the powders in the loose state

• The ratio of the volume of the pores to the bulk volume

• The volume of closed pores