Graphite crucible heat resistance, then graphite crucible can ignite? Charcoal is mainly composed of graphite, why charcoal can be ignited?
Burning graphite under no oxygen at least 3000 degrees in the air in the ignition temperature is higher, not so high temperature of fire in the air, so the graphite can ignite. Charcoal contains carbon, hydrogen, oxygen, nitrogen containing and small amounts of other elements
Graphite is a very pure material, graphite is a transitional type crystal. Each layer of graphite carbon atoms in nonpolar covalent bond connected between molecular layer and graphite by intermolecular forces. The melting point of connection is 3652 to 3697 DEG C (sublimation), so the high temperature graphite crucible.
Is not the same as the graphite crystal transition in carbon charcoal, but amorphous carbon, no C-C covalent bond. Charcoal ignition point is 320-370 DEG C, the general fire than the high temperature, so the charcoal can be ignited.
