The oxidation weight loss rates of expanded graphite and flake graphite are different at different temperatures. The oxidation rate of expanded graphite is higher than that of flake graphite, and the starting temperature of the oxidation weight loss rate of expanded graphite is lower than that of natural flake graphite. At 900 degrees, the oxidation weight loss rate of natural flake graphite is less than 10%, while the oxidation weight loss rate of expanded graphite is as high as 95%.
But it is worth noting that compared with other traditional sealing materials, the oxidation initiation temperature of expanded graphite is still very high, and after the expanded graphite is pressed into shape, its oxidation rate will be much lower due to the reduction of its surface energy. .
In a pure oxygen medium at a temperature of 1500 degrees, expanded graphite does not burn, explode, or undergo any observable chemical changes. In the medium of ultra-low liquid oxygen and liquid chlorine, expanded graphite is also stable and does not become brittle.
Post time: Aug-12-2022