With the increase of forming pressure, the pores of graphite material decrease, and the blank gradually densifies.

The strength of the blank increases gradually due to the joint force of graphite powder particles.

The strength of graphite blanks has the following three contributions:

1、Mechanical meshing forces between graphite powder particles.

2、Attraction between surface atoms of graphite powder particles.

3、For the particles with binder on the surface of graphite powder, the higher the viscosity of binder, the greater its contribution to the strength of blank.

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