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Which pressing technique employs a rubber envelope and application of pressure by fluid?

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Which pressing technique employs a rubber envelope and application of pressure by fluid?

(a) Hot pressing

(b) Uniaxial pressing

(c) Isostatic pressing

(d) Powder pressing

I got this question by my school principal while I was bunking the class.

The above asked question is from Ceramic Formation & Clay Ceramics topic in section Composite & Ceramic Materials of Engineering Material & Metallurgy

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Right option is (c) Isostatic pressing

Easiest explanation: Hot, uniaxial, and isostatic pressing are techniques of the powder pressing method. In the isostatic method, a rubber envelope contains the powdered material which is applied pressure on by a fluid, equally in all directions. This differs from uniaxial pressing as the pressure is only applied in a single direction for that operation, but is similar in the sense that they both require being fired after pressing.

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