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

摘要

Provided is a method of manufacturing an item, notably a culinary item, including a support provided with a sol-gel covering, which method involves a pressing step performed after the sol-gel covering has been applied to and pre-densified on the support.

主权项

1. 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.