A cooking apparatus including an enamel coating layer having an improved cleaning efficiency and a manufacturing method therefor are provided. The cooking apparatus includes a cooking compartment configured to accommodate a cooking object, a door configured to open and close the cooking compartment, and an enamel coating layer provided on a surface of the cooking compartment. The enamel coating layer includes, in percent (%) by weight of the entire composition, 5% or less (excluding 0%) of a silicon dioxide (SiO.sub.2), 10% to 20% of an aluminum oxide (Al.sub.2O.sub.3), 10% to 20% of a phosphorous pentoxide (P.sub.2O.sub.5), 5% to 15% of a rare earth oxide, and 5% to 10% of a ferric oxide (Fe.sub.2O.sub.3).

A cooking apparatus including an enamel coating layer having an improved cleaning efficiency and a manufacturing method therefor are provided. The cooking apparatus includes a cooking compartment configured to accommodate a cooking object, a door configured to open and close the cooking compartment, and an enamel coating layer provided on a surface of the cooking compartment. The enamel coating layer includes, in percent (%) by weight of the entire composition, 5% or less (excluding 0%) of a silicon dioxide (SiO.sub.2), 10% to 20% of an aluminum oxide (Al.sub.2O.sub.3), 10% to 20% of a phosphorous pentoxide (P.sub.2O.sub.5), 5% to 15% of a rare earth oxide, and 5% to 10% of a ferric oxide (Fe.sub.2O.sub.3).

An aluminum member exhibits improved alkali resistance with respect to an anodic oxide coating. The highly alkali-resistant aluminum member includes a material that includes aluminum or an aluminum alloy, an anodic oxide coating that is formed on the surface of the material, and a coating layer that is formed on the anodic oxide coating, and includes a siloxane glass component in a ratio of 90 mass % or more, wherein the coating layer has a thickness of 0.5 to 5.0 m and a coating mass of 0.4 to 5.0 g/m.sup.2.

An aluminum member exhibits improved alkali resistance with respect to an anodic oxide coating. The highly alkali-resistant aluminum member includes a material that includes aluminum or an aluminum alloy, an anodic oxide coating that is formed on the surface of the material, and a coating layer that is formed on the anodic oxide coating, and includes a siloxane glass component in a ratio of 90 mass % or more, wherein the coating layer has a thickness of 0.5 to 5.0 m and a coating mass of 0.4 to 5.0 g/m.sup.2.

Disclosed are barrier coatings for fused silica components used in semiconductor processing. In particular, the present disclosure concerns protective substrate-barrier coatings composed of corrosion-resilient metal compounds which provide superior resistance to erosion/corrosion when a coated substrate is subjected to the acidic environments at elevated temperatures typical for semiconductor processing.

A metal component which has a face which during use is thermally or mechanically more highly loaded than the environment thereof and which is at least partially covered with a glaze or enamel layer and a method for the production thereof. The metal component requires no specific limitations during the thermal processing operation and nonetheless ensures optimum protection for the surfaces which are highly loaded during use. The glaze or enamel layer contains, with respect to the enamel frit used to produce the enamel coating, from 2 to 35% by weight of an admixture of particles which consist of at least one material from glass, organic plastics materials, and synthetic oxide mixtures or melts, which each have a thermal expansion coefficient of a maximum of 5010.sup.7 K.sup.1 and a melting temperature of at least 500 C.

A metal component which has a face which during use is thermally or mechanically more highly loaded than the environment thereof and which is at least partially covered with a glaze or enamel layer and a method for the production thereof. The metal component requires no specific limitations during the thermal processing operation and nonetheless ensures optimum protection for the surfaces which are highly loaded during use. The glaze or enamel layer contains, with respect to the enamel frit used to produce the enamel coating, from 2 to 35% by weight of an admixture of particles which consist of at least one material from glass, organic plastics materials, and synthetic oxide mixtures or melts, which each have a thermal expansion coefficient of a maximum of 5010.sup.7 K.sup.1 and a melting temperature of at least 500 C.

An aluminum member exhibits improved alkali resistance with respect to an anodic oxide coating. The highly alkali-resistant aluminum member includes a material that includes aluminum or an aluminum alloy, an anodic oxide coating that is formed on the surface of the material, and a coating layer that is formed on the anodic oxide coating, and includes a siloxane glass component in a ratio of 90 mass % or more, wherein the coating layer has a thickness of 0.5 to 5.0 m and a coating mass of 0.4 to 5.0 g/m.sup.2.

An aluminum member exhibits improved alkali resistance with respect to an anodic oxide coating. The highly alkali-resistant aluminum member includes a material that includes aluminum or an aluminum alloy, an anodic oxide coating that is formed on the surface of the material, and a coating layer that is formed on the anodic oxide coating, and includes a siloxane glass component in a ratio of 90 mass % or more, wherein the coating layer has a thickness of 0.5 to 5.0 m and a coating mass of 0.4 to 5.0 g/m.sup.2.

A method for producing a glass-like protective layer on an optionally pre-coated metal or glass substrate. The method comprises: (a) mixing one or more defined silicon compounds with NaOH and KOH, (b) adding water to the mixture obtained in (a) to hydrolyze the silicon compound(s), (c) adding at least one defined compound of formula MY.sub.m, where M is Pb, Ti, Zr, Al or B, to the hydrolyzed mixture obtained in (b), wherein the molar ratio M/Si is from 0.01/1 to 0.04/1, to obtain a coating sol, (d) applying the coating sol obtained in (c) to the substrate, and (e) thermal densification of the coating sol applied in d) at a temperature of from 300 C. to 500 C. to form the glass-like protective layer.