Method for coating oxidation protective layer for carbon/carbon composite, carbon heater, and cooker

A carbon heater comprising:

• a filament formed of a carbon or carbon composite coated with an oxidation protective layer;
• and
• terminals connected to both ends of the filament, which supply power to the filament,
• wherein the filament is coated with the oxidation protective layer by a process comprising:
• dissolving a polymer resin in a solvent to form a solution of polymer resin;
• dispersing ceramic powders in the solution of polymer resin to form a mixed solution;
• coating the mixed solution on a carbon fiber;
• performing a first heat-treatment to treat the carbon fiber by heat in air;
• and
• performing a second heat-treatment to treat the carbon fiber by heat under an inert gas.

A cooker comprising:

• a cavity having a cooking chamber;
• a carbon heater for supplying energy to cook foods within the cooking chamber;
• a reflector for reflecting energy from the carbon heater into the cooking chamber;
• and a door to open and close selectively the cooking chamber,
• wherein the carbon heater comprises:
• a filament formed of a carbon or carbon composite coated with an oxidation protective layer;
• and
• terminals connected to both ends of the filament, which supply power to the filament,
• wherein the filament is coated with the oxidation protective layer by a process comprising dissolving a polymer resin in a solvent to form a solution of polymer resin;
• dispersing ceramic powders in the solution of polymer resin to form a mixed solution;
• coating the mixed solution on a carbon fiber;
• performing a first heat-treatment to treat the carbon fiber by heat in air;
• and performing a second heat-treatment to treat the carbon fiber by heat under an inert gas.