Question

What does the term ‘green’ refer to for drying and firing operations?

(a) Fired but not dried

(b) Dried but not fired

(c) Dried then fired

(d) Fired then dried

I have been asked this question in a national level competition.

This intriguing question comes from Ceramic Formation & Clay Ceramics topic in section Composite & Ceramic Materials of Engineering Material & Metallurgy

Answer 1

The correct choice is (b) Dried but not fired

To explain I would say: Drying and firing are two operations carried out in a particulate forming technique of ceramic fabrication. Usually, the body is dried before it is fired. In some cases, however, the body may be formed and dried but not fired. Such a body is referred to as ‘green’.