Atomization - Powder Metallurgy MCQ Questions

Explanation: Atomization is the dominant method for producing metal and prealloyed powders from aluminum, brass, iron, low-alloy steels, stainless steels, tool steels, superalloys, titanium alloys, and other alloys

Explanation: Yes, the solidification rate is inversely proportional to the particle size

Explanation: Vacuum atomization is also known as soluble gas atomization, uses the principle that when a molten metal supersaturated with a gas under pressure is suddenly exposed to vacuum, the gas coming out of the metal solution expands rapidly, causing atomization of the metal stream.

Explanation: the minimum size of powder grains to approximately 10 μm.

Explanation: The major components of a typical atomization set-up include: (1) Melting and superheating facility, (2) Atomization chamber, and (3) Powder collection tank which is further of two types- dry collection and wet collection

Explanation: The average particle size of a nozzle design is controlled by the pressure of the atomizing medium as well as by the apex angle between the axes of the gas jets. Higher apex angles lead to smaller particle sizes.

Explanation: True, The advantage of water atomization is that metal solidifies faster than by gas atomization since the heat capacity of water is some magnitudes higher than gases.

Explanation: The factors which affect the particle size of atomized powder include- (1) Metal properties (temperature, viscosity, and feed rate). (2) Properties of atomizing medium (medium pressure and volume). (3) Nozzle configurations (jet angle and jet length).

Explanation: REP i.e. Rotating Electrode Process is also known as centrifugal atomization, this process involves use of centrifugal force to break off molten metal drops from the molten end of a consumable electrode.

Explanation: The water atomized particles are smaller, cleaner, and nonporous and have a greater breadth of size, which allows better compacting