There are two ways to volatile graphite powder

There are two methods for determining the volatile content of graphite powder, one is the nitrogen protection method, and the other is the arbitration method. Here is a brief overview:

The sample is placed in a nitrogen gas stream and burned at a high temperature to decompose and escape the volatiles. The loss on ignition is the volatiles.

Analysis steps: Take 0.5 g to 1 g sample on a quartz boat with constant weight, put the quartz boat on a tray, and close the mouth of the pyrolysis furnace with a temperature of 950 degrees Celsius and stable nitrogen. Preheat the furnace door for 1min-2min, push the tray into the high temperature zone, and start timing. After boiling for 7 minutes, move the tray to the furnace mouth, take it out after cooling for about 2 minutes, and place it in a desiccator until it is cold and weighed at room temperature.

In the box-type high-temperature furnace method, the sample is scorched at a high temperature to decompose and escape the volatile substances, and the ignition loss is the volatile matter.

Specific steps: accurately weigh 1 gram of sample, evenly spread it on the bottom of the double-lid porcelain pot, place the crucible on the crucible rack, cover the bottom of the double-lid porcelain pot, put it into the box-type high-temperature furnace, and close the door. At 400 degrees, the fixed carbon content is not less than 98%, and the fluctuation does not exceed 20 degrees for 1 hour; it is burned at 950 degrees for 7 minutes, and the fluctuation does not exceed 20 degrees for 1 hour. Put the crucible into the furnace to start timing, the stakeout temperature should rise to 950 degrees within 3 minutes, and the fluctuation should not exceed 20 degrees, otherwise the result is invalid.

After burning, quickly take out the crucible and cool it for 1-2min-2min, then move it into the dryer to cool to room temperature and weigh it.