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gor glass ceramics making using a sintering process why we don't have tonadd nucleation agents?

gor glass ceramics making using a sintering process why we don't have tonadd nucleation agents?

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Glass-ceramics are usually produced in two steps: First, a glass-manufacturing process which formed glass which is cooled down and reheated in a second step. In this heat treatment which partly crystallizes glass.

In most of the cases nucleation agents are added to the base composition of the glass-ceramic. These nucleation agents helps in control the crystallization process. Because there is usually no pressing and sintering in case of glass-ceramics but unlike sintered ceramics which do not have pores thus we don't add nucleation agent in case of glass cermaics and making use of sintering process.

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