Discussion
Consider the following statements about pressure-assisted sintering.
1. Hot pressing applies uniaxial pressure at temperature.
2. Applied pressure permits full density at lower temperature.
3. Hot pressing is well suited to complex three-dimensional shapes.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: hot pressing applies uniaxial pressure at temperature, and that pressure permits full density at a lower temperature than pressureless sintering. Statement 3 is wrong, and it is the technique’s principal limitation - a uniaxial die can only produce simple shapes such as discs and plates, one at a time. Hot isostatic pressing exists to lift exactly that restriction.
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