Powder Metallurgy Questions and Answers – Structure and Property Changes during Sintering

This set of Powder Metallurgy Multiple Choice Questions & Answers (MCQs) focuses on “Structure and Property Changes during Sintering”.

1. Densification cannot be treated as equal to the amount of porosity removed.
a) True
b) False
View Answer

Answer: a
Explanation: Densification is proportional to the shrinkage or the number of pores removed in the case of single component systems (e.g. metals). In the case of multicomponent systems such as premixed powders, during sintering solid solutions may form resulting in an expansion rather than shrinkage. Expansion of the compact may also take place due to the entrapped gases. Thus, densification cannot be treated as equal to the amount of porosity removed.

2. Sintering results in ________
a) Change in structure of compact
b) Structural change, recrystallization, and grain shrinkage
c) Structural change, reduction of surface oxides, and grain growth
d) Pore growth
View Answer

Answer: c
Explanation: Densification during sintering usually results in a change in the structure of grains as well those of pores present in the initial compact. Reduction of surface oxides may occur during sintering in a reducing atmosphere. In case of powder mixes, containing metals with lower melting point, evaporation of these metals can occur. Other changes occurring during sintering include recrystallization and grain growth. Pore growth also occurs if sintering is carried out for longer times at high temperatures.

Sanfoundry Global Education & Learning Series – Powder Metallurgy.


To practice all areas of Powder Metallurgy, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.