In general, we think that the strength change of graphite products is related to apparent density, porosity and so on. In fact, the strength change of graphite products is also related to the strength of raw materials themselves.
The grain size of filler and pore size only affects the graphite strength under certain false density, true density and porosity. The variety, grain size and pore size of the filler are independent variables and play a decisive role in the strength change of graphite products.
The fracture of graphite materials presents extremely complex physical or mechanical phenomena. The fracture of graphite material mainly caused by the potential crack propagation is generally brittle fracture.
The fracture of carbon/carbon composite is not brittle fracture. The fracture of carbon/carbon composites shows a certain toughness, showing a "pseudo-elastic-plastic effect" and obvious energy absorption during fracture.