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US 2019/0292059 A1Published application
Artificial graphite flake manufacturing method
OwnerPin Yu KOinventor
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Abstract
An artificial graphite flake manufacturing method mainly using PI (Polyimide) film as a material comprising steps of perforating holes and stacking and compacting various graphite auxiliary materials so as to stabilize the quality of heating and sintering, ensure product flatness, and further proceed step-by-step regulation during the heating process, making the carbonization and graphitization reaction more complete, and indeed improving the quality and yield of manufacturing.
Claims7
An artificial graphite flake manufacturing method for manufacturing artificial graphite flakes by using PI (polyimide) films as a material, comprising the following steps:
- (a) a step for providing a plurality of PI films;
- (b) a step for perforating a plurality of holes with a diameter of 0.1˜1 mm on each of the artificial graphite flakes and an interval between any two adjacent holes is between 0.1˜5 mm;
- (c) a step for alternately stacking said PI films and natural graphite dust papers so that each PI film is sandwiched by two of the natural graphite dust papers;
- (d) a step for pressing said alternately stacked PI films and natural graphite dust papers with at least a graphite board and accommodating them into a graphite box in which there is reserved a predetermined space for inflation;
- (e) a step for accommodating said graphite box into a temperature increasing environment and starting to proceed a continuous heating;
- (f) a step for injecting a stabilizing gas for degumming when the temperature rises to about 400° C., the injection amount gradually increasing with the temperature in the range of 10 to 60 L/min while stopping the increase of the stabilizing gas injection when the temperature rises to about 600° C., the amount being adjusted to 10˜30 L/min;
- (g) a step for adjusting the stabilization gas injection amount to 60 L/min when the temperature rises to about 2300° C.;
- and
- (h) a step for cooling and then obtaining artificial graphite flakes from carbonized and graphitized PI films when the continuous heating process is finished after the temperature rises to 2500˜3000° C.
6 more elements
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