Sol-gel based heating element
A heating element includes an electrically insulating layer and an electrically conductive layer. At least the electrically conductive layer is based on a hybrid sol-gel precursor including an organosilane compound.
1. A heating element comprising an electrically insulating layer and an electrically conductive layer, wherein both the electrically insulating layer and the electrically conductive layer are based on a hybrid sol-gel precursor comprising at least one organosilane compound.
2. The heating element according to claim 1 , wherein the at least one compound is from a group of alkyl-alkoxysilanes.
3. The heating element according to claim 1 , wherein the electrically insulating layer comprises anisotropic, non-conductive particles.
4. The heating element according to claim 1 , wherein the electrically conductive layer comprises conductive and/or semi-conductive particles, as well as an amount of insulating particles in a quantity of 0-20% by volume.
5. The heating element according to claim 4 , wherein the electrically conductive layer comprises metal particles.
6. The heating element according to claim 5 , wherein the electrically conductive layer comprises silver or silver alloy particles.
7. The heating element according to claim 4 , wherein the electrically conductive layer comprises graphite or carbon-black particles.
8. The heating element according to claim 1 , wherein the electrically conductive layer does not exceed 30 mm in thickness.
9. The heating element according to claim 1 , wherein the insulating layer has a thickness of 25-100 mm.
10. The heating element according to claim 1 , wherein the heating element is applied on an aluminum or aluminum alloy substrate.
11. An electrical domestic appliance, comprising:
a heating element, which comprises:
an electrically insulating layer; and
an electrically conductive layer;
wherein both the electrically insulating layer and the electrically conductive layer are based on a hybrid sol-gel precursor comprising an organosilane compound.
12. The electrical domestic appliance according to claim 11 , wherein the electrical domestic appliance is one of: an iron, a hair dryer, a hair styler, a steamer, 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, grill, a space heater, a waffle iron, a toaster, an oven, or a water heater.
13. The heating element of claim 1 , wherein the electrically insulating layer comprises non-conductive particles having longest dimension of 2-500 micrometers, and wherein the non-conductive particles comprise 4-10% by volume of the electrically insulating layer.
14. The heating element of claim 1 , wherein the electrically insulating layer comprises non-conductive flat-shaped particles having longest dimension of 2-500 micrometers, and further non-conductive particles in colloidal form.
15. The electrical domestic appliance of claim 11 , wherein the electrically insulating layer comprises non-conductive particles having longest dimension of 2-500 micrometers, and wherein the non-conductive particles comprise 4-10% by volume of the electrically insulating layer.
16. The electrical domestic appliance of claim 11 , wherein the electrically insulating layer comprises non-conductive flat-shaped particles having longest dimension of 2-500 micrometers, and further non-conductive particles in colloidal form.
17. The heating element of claim 1 , wherein the at least one organosilane compound comprises at least one of methyl-trimethoxysilane (MTMS) and methyl-triethoxysilane (MTES).
18. The heating element of claim 1 , wherein the electrically conductive layer includes a different organosilane compound than the electrically insulating layer.