Method of Manufacturing a Heating Article Provided with a Sol-Gel Coating

Method of producing a heating item, comprising the following steps:

• a) providing a support in the form of a preform with at least two opposite surfaces;
• b) preparing a sol-gel composition consisting of at least one metal-alkoxide sol-gel precursor;
• c) hydrolyzing said sol-gel precursor in the presence of water and an acid or base catalyst, followed by a condensation reaction;
• d) applying onto at least one support surface of the preform at least one layer of said sol-gel composition of a thickness ranging from 5 to 120 μm, to form a sol-gel coating layer;
• followed by
• e) thermally treating to solidify said sol-gel coating layer to provide a coated preform;
• wherein, between step d) of applying the sol-gel composition onto at least one of the preform surfaces and step e) for thermally treating for solidification, the method includes two successive steps of
• d′) pre-densifying the coated preform to produce a sol-gel coating layer with a pencil hardness ranging from 4B to 4H;
• followed by
• d″) stamping of said preform to produce a final form of the culinary item, with an interior surface intended to receive food and an exterior surface intended to come into contact with a heat source.