Re-preheating impregnation method for unqualified impregnated graphite product
A graphite impregnation treatment technology, which is applied in the field of re-preheating impregnation of unqualified graphite impregnation products, can solve problems such as uneven impregnation and asphalt coking, and achieve the effect of reducing the impact
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Embodiment 1
[0050] 1. Preheat
[0051] (1) Freely heat up unqualified graphite impregnated products from ambient temperature to 145°C;
[0052] (2) Then raise the temperature to 195°C at a heating rate of 3.5°C / h. After this stage is completed, remove the impurities on the outer surface of the product;
[0053] (3) Then raise the temperature to 315°C at a heating rate of 12.5°C / h, and clean the impurities on the surface again after being released from the furnace;
[0054] (4) Finally, keep the temperature at 315°C for 6 hours, and the preheating is over;
[0055] 2. Dipping
[0056] The preheated unqualified graphite impregnated products are placed in the impregnating equipment, vacuumized, the vacuum degree is -0.086MPa, and then the asphalt is injected into the impregnating equipment to form an impregnating system, and the impregnating system is applied with a pressure of 1.7-1.85Mpa for impregnation For processing, keep the pressure constant for 8 hours, then inject normal temperat...
Embodiment 2
[0058] 1. Preheat
[0059] (1) Freely raise the temperature of unqualified graphite impregnated products from ambient temperature to 150°C;
[0060] (2) Then raise the temperature to 200°C at a heating rate of 3.5°C / h. After this stage is completed, remove the impurities on the outer surface of the product;
[0061] (3) Then raise the temperature to 320°C at a heating rate of 12.5°C / h, and clean the impurities on the surface again after being released from the furnace;
[0062] (4) Finally, keep the temperature at 320°C for 6 hours, and the preheating is over;
[0063] 2. Dipping
[0064] The preheated unqualified graphite impregnated products are placed in the impregnating equipment, vacuumized, the vacuum degree is -0.086MPa, and then the asphalt is injected into the impregnating equipment to form an impregnating system, and the impregnating system is applied with a pressure of 1.7-1.85Mpa for impregnation For processing, keep the pressure constant for 8 hours, then injec...
Embodiment 3
[0066] 1. Preheat
[0067] (1) Freely heat up unqualified graphite impregnated products from ambient temperature to 155°C;
[0068] (2) Then the temperature is raised to 205°C at a heating rate of 3.5°C / h. After this stage is completed, the impurities on the outer surface of the product are removed;
[0069] (3) Then raise the temperature to 325°C at a heating rate of 12.5°C / h, and clean the impurities on the surface again after being released from the furnace;
[0070] (4) Finally, keep the temperature at 325°C for 6 hours, and the preheating is over;
[0071] 2. Dipping
[0072] The preheated unqualified graphite impregnated products are placed in the impregnating equipment, vacuumized, the vacuum degree is -0.086MPa, and then the asphalt is injected into the impregnating equipment to form an impregnating system, and the impregnating system is applied with a pressure of 1.7-1.85Mpa for impregnation For processing, keep the pressure constant for 8 hours, then inject normal...
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