Article | REF: M3310 V1

Hot isostatic pressing

Author: Emmanuel RIGAL

Publication date: December 10, 2017, Review date: October 23, 2020

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3. Processes and mechanisms

The processes and mechanisms involved in HIP processes are quantitatively highly dependent on materials and cycle parameters, but they can be qualitatively classified into different categories.

Box 6: Effects of pressure on dense materials

By definition, isostatic pressurization P at constant temperature produces no change in shape (for an isotropic dense solid), but a slight change in volume according to the equation dV/V = - χdP, where χ is the compressibility of the material at the temperature considered (χ~1/E, E being Young's modulus). An analogy can be made with thermal expansion at constant pressure dV/V = βdT = 3αdT, where β is the coefficient of thermal expansion in volume and α the coefficient of linear thermal expansion.

Since the reduction in volume caused by isostatic pressure results...

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