Metallurgical Principles and Practice of Engineering (PE) Study Guide: Question #19

It Is the Policy of The Minerals, Metals & Materials Society (TMS) to Encourage the Professional Registration of Metallurgical Engineers.
What is the primary reason for NOT using molybdenum electrical heating elements in an air furnace?

(A)	Formation of MoO₃ vapor leads to catastrophic oxidation.
(B)	Rapid build-up of a thick, insulating molybdenum scale reduces heat transfer.
(C)	The electrical resistance of molybdenum is too low to efficiently provide heat.
(D)	Molybdenum and its oxides are too brittle to survive the furnace thermal cycles

The information on this page is maintained by the Nellie Luther (natale@tms.org).

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