Scratch-resistant coating for glass ceramic cooktop

Patent metadata

Field	Value
Publication number	US-12246985-B2
Application number	US-202117519899-A
Country	US
Kind code	B2
Filing date	Nov 5, 2021
Priority date	Nov 6, 2020
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

Scratch-resistant coatings, especially for cooktops, and substrates or products having said scratch-resistant coatings and methods for the production thereof are described herein. More particularly, scratch-resistant coatings obtained via sol-gel approach and coated substrates having thereon a hard material layer comprising metal nitride(s) and/or metal oxynitride complexes are described, as well as the manufacturing thereof.

First claim

What is claimed is:

1. A sol coating for a cooking appliance comprising:
one or more metal precursors solubilized in a solvent with an overall concentration of 0.05 to 0.5 M, the one or more metal precursors comprises at least aluminum chloride; and
a nitrogen carrier,
wherein the one or more metal precursors and nitrogen carrier are taken under a continuous nitrogen flux at room temperature and wherein a molar ratio between the nitrogen carrier and the one or more metal precursors is between 0.5 to 5, and upon deposition of a layer of the sol coating having a thickness of 1-8 micrometers via screen-printing, or 100 to 200 nm via dip-coating or spray-coating, onto a cooking surface and curing, the sol coating has a scratch resistance of 10 to 16 N as based on pencil hardness.

2. The sol coating of claim 1 , further comprising (3-glycidyloxypropyl) trimethoxysilane provided as a 0.05 M solution in ethanol.

3. The sol coating of claim 1 , wherein the one or more metal precursors further includes zirconium chloride.

4. The sol coating of claim 1 , wherein the one or more metal precursors is solubilized in the solvent with an overall concentration of 0.1 M.

5. The sol coating of claim 1 , wherein, upon curing, the sol coating has a water static contact angle of 40 to 90 degrees.

Assignees

• Whirlpool Emea Spa
• Whirlpool Co

Inventors

• Basso Margherita
• De Nardo Luigi
• D'Agostino Agnese

Classifications

• C04B35/64

  Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) · CPC title

• C04B35/632

  Organic additives · CPC title

• C04B35/6264

  Mixing media, e.g. organic solvents · CPC title

• C04B35/624

  Sol-gel processing · CPC title

• C04B35/62222

  obtaining ceramic coatings (coating of mortars, concrete, artificial or natural stone or ceramics C04B41/45; laminated ceramic products B32B18/00; coating of glass C03C17/00, applying ceramic coatings on silicon for semi-conductor purposes H10W; coating metallic materials C23) · CPC title