Discussion
Spark plasma sintering achieves very rapid densification by
Answer: D
Correct answer: passing a pulsed current through the die and powder
A pulsed direct current is passed through the graphite die and, in a conducting powder, through the compact itself, so the heat is generated within the sample rather than conducted in from outside. Heating rates of hundreds of degrees per minute are possible, and full density can be reached in minutes - far too quickly for the grains to coarsen appreciably.
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