Preparation method of large-sized compact silicon carbide ceramic plate

[0022] Prepare a silicon carbide ceramic plate with a length×width×thickness of 600mm×400mm×40mm by the following method, including the following steps:

[0023] 1) Mixing mix 1 part by weight of graphite powder with a purity of 99.8 to 99.9% and 25 parts by weight of silicon carbide powder with a purity of 99.8 to 99.9%, and then add 2 parts by weight of zinc stearate and 15 parts by weight of The polyvinyl alcohol is uniformly stirred to obtain a mixture;

[0024] 2) Spray granulation adopts a centrifugal spray dryer to spray and granulate the mixture to obtain granulated powder;

[0025] 3) Hot-press forming Put the prepared granulated powder into a metal mold, use a 500-600T hot-press machine, pressurize and release pressure 4 times under the conditions of temperature 180°C and pressure 35MPa, and obtain a hot-press forming plate body;

[0026] 4) Humidification and drying Place the formed green body in a humidification and drying equipment, and slowly humidify and dry for

[0031] Prepare a silicon carbide ceramic plate with a length×width×thickness of 700mm×500mm×50mm by the following method, including the following steps:

[0032] 1) Mixing mix 1.4 parts by weight of graphite powder with a purity of 99.8 to 99.9% and 28 parts by weight of silicon carbide powder with a purity of 99.8 to 99.9%, and then add 3 parts by weight of zinc stearate and 18 parts by weight of The polyvinyl alcohol is uniformly stirred to obtain a mixture;

[0033] 2) Spray granulation adopts a centrifugal spray dryer to spray and granulate the mixture to obtain granulated powder;

[0034] 3) Hot-press forming Put the prepared granulated powder into a metal mold, use a 500-600T hot-press machine, pressurize and release the pressure 5 times at a temperature of 190°C and a pressure of 45MPa, and obtain a hot-press-formed plate body;

[0035] 4) Humidification and drying Place the formed green body in a humidification and drying equipment, and slowly humidify and dry for 110 h

[0040] Prepare a silicon carbide ceramic plate with a length×width×thickness of 800mm×600mm×60mm by the following method, including the following steps:

[0041] 1) Mixing After mixing 2 parts by weight of graphite powder with a purity of 99.8 to 99.9% and 30 parts by weight of silicon carbide powder with a purity of 99.8 to 99.9%, add 4 parts by weight of zinc stearate and 20 parts by weight of The polyvinyl alcohol is uniformly stirred to obtain a mixture;

[0042] 2) Spray granulation adopts a centrifugal spray dryer to spray and granulate the mixture to obtain granulated powder;

[0043]3) Hot-press forming Put the prepared granulated powder into a metal mold, use a 500-600T hot press, pressurize and release the pressure under the conditions of a temperature of 200°C and a pressure of 55MPa, and obtain a blank of a hot-pressed forming plate body;

[0044] 4) Humidification and drying Place the formed body in a humidification and drying equipment, and slowly humidify and dry