THIN-FILM HEATING ELEMENT

• US 20090114639A1
• Filed: 11/11/2004
• Published: 05/07/2009
• Est. Priority Date: 11/20/2003
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Rethmeier, Roel, Werkman, Pieter Johannes
• Granted Patent: US 9,493,906 B2
• Time in Patent Office: Days
• US Class Current: 219/543
• CPC Class Codes: D06F 75/24 Arrangements of the heating means within the iron; Arrangements for distributing, conducting or storing the heat
• CPC Class Codes: H05B 3/262 the insulating base being an insulated metal plate
• CPC Class Codes: Y10T 29/49083 Heater type

Abstract

The invention relates to a heating element comprising an aluminum substrate, an electrically insulating layer based on a sol-gel precursor, and an electrically resistive layer with a thickness smaller than 2 μm. The features of this heating element solve the problem of the crack formation due to a mismatch of thermal expansion coefficient of the aluminum substrate and the resistive layer. Also disclosed is an electrical domestic appliance comprising the heating element of the invention.

Claims

1. A film heating element, at least comprising an aluminum substrate, an electrically insulating layer which is based on a sol-gel precursor, and an electrically resistive layer with a thickness smaller than 2 μ

m.

2. A film heating element as claimed in claim 1, wherein the electrically resistive layer comprises an inorganic material.

3. A film heating element as claimed in claim 1, wherein the sol-gel precursor is a hybrid sol-gel precursor comprising an organosilane compound.

4. A heating element as claimed in claim 3, characterized in that the organosilane compound comprises methyl-trimethoxysilane or methyl-triethoxysilane.

5. A heating element as claimed in claim 1, wherein the heating element further comprises a conductive layer.

6. An electrical domestic appliance comprising at least a heating element in accordance with claim 1.

7. An electrical domestic appliance according to claim 6, characterized in that the electrical domestic appliance comprises a (steam) iron, a hair dryer, a hair styler, a steamer and a steam cleaner, a garment cleaner, a heated ironing board, a facial steamer, a kettle, a pressurized boiler for system irons and cleaners, a coffee maker, a deep-fat fryer, a rice cooker, a sterilizer, a hot plate, a hot-pot, a grill, a space heater, a waffle iron, a toaster, an oven, or a water flow heater.

8. A method of manufacturing a heating element according to claim 1, at least comprising the steps of:

providing an aluminum substrate;

applying an electrically insulating layer on said substrate; and

applying a resistive layer on top of the electrically insulating layer, characterized in that the electrically insulating layer is obtained by means of a sol-gel process and the resistive layer has a thickness smaller than 2 μ

m.