Process of preparing asphalt carbon foam material
A technology of carbon foam and asphalt, which is applied in the field of preparation of pitch carbon foam materials, can solve the problems of low compressive strength, uneven structure, and low expansion ratio, and achieve high thermal and electrical conductivity, uniform pore size distribution, and open cell ratio high effect
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[0029] Example 1
[0030] Put 50g of coal tar pitch into a container, add 50ml of toluene solvent, place it in an autoclave and seal it under vacuum protection. Increase the temperature to 300°C at a heating rate of 5°C / min, and keep the temperature for 240 minutes. The temperature is lowered to 290°C, then the gas is released at a rate of 0.05 MPa / s, and the asphalt foam material with large porosity and uniform cells can be obtained by lowering it to room temperature. After oxidizing at 220°C for 600min, then carbonizing at 950°C for 120min, and then graphitizing at 2400°C for 120min, the final pitch carbon foam material can be obtained.
[0031] The prepared pitch carbon foam material has a bulk density of 0.5g / cm 3 , Thermal expansion coefficient 5.2ppm / ℃, thermal conductivity 110~150w / mk, specific thermal conductivity 220~250(w / mk) / (g / cm 3 ), the opening rate is 84%, and the cell diameter is 500-1000μm.
Example Embodiment
[0032] Example 2
[0033] Put 50g of mesophase pitch into a container, add 50ml of toluene solvent, place it in an autoclave and seal it under vacuum protection. Raise the temperature to 320°C at a heating rate of 5°C / min and keep it for 240 minutes. The temperature is lowered to 315°C, then the gas is released at a rate of 0.05MPa / s, and the asphalt foam material with large porosity and uniform cells can be obtained by lowering it to room temperature. After oxidizing at 220°C for 600min, then carbonizing at 950°C for 120min, and then graphitizing at 2400°C for 120min, the final pitch carbon foam material can be obtained.
[0034] The prepared pitch carbon foam material has a bulk density of 0.2~0.3g / cm 3 ; Thermal expansion coefficient 3.5ppm / ℃, thermal conductivity 150~220w / mk, specific thermal conductivity 200~240(w / mk) / (g / cm 3 ), the opening rate is 90%, and the cell diameter distribution is 90-130μm.
Example Embodiment
[0035] Example 3
[0036] Put 50g of mesophase pitch into a container, add 50ml of toluene solvent, place it in an autoclave and seal it, and fill it with nitrogen for protection. Set the initial pressure to 3MPa, raise the temperature to 320°C at a heating rate of 5°C / min, and keep the temperature for 240min. Lower the temperature to 315°C, then deflate at a rate of 0.5MPa / s, and lower it to room temperature to obtain a bituminous foam material with large porosity and uniform cells. After oxidizing at 220°C for 600min, then carbonizing at 950°C for 120min, and then graphitizing at 2400°C for 120min, the final pitch carbon foam material can be obtained.
[0037] The prepared pitch carbon foam material has a bulk density of 0.2~0.3g / cm 3 ; Thermal expansion coefficient 3.2ppm / ℃, thermal conductivity 150~240w / mk, specific thermal conductivity 200~240(w / mk) / (g / cm 3 ), the opening rate is 94%, and the average cell diameter is 97±5μm.
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