Granted Patent B2

US 12,356,533 · App. 17/558,726 · Granted Jul 8, 2025

Inventor: Muhammad Khizar (St. Joseph, MI)

H05B6/6402H05B6/80H05B2206/04

Abstract

Claims (29)

1. A microwave heating appliance comprising:

a housing having interior walls with interior surfaces defining a cooking chamber for heating food;

a microwave heating source configured to generate microwave radiation for heating the food; and

a rapid heating plate disposed in the cooking chamber, the rapid heating plate including a substrate having a hybrid coating disposed on thereon, the hybrid coating configured to generate heat upon application of a magnetic field and upon absorption of the microwave radiation from the microwave heating source,

wherein the hybrid coating includes ferromagnetic nanowires and ferritic carbon nanotubes dispersed in a polymer to generate heat for transferring to food placed on the rapid heating plate in the cooking chamber.

2. The microwave heating appliance of claim 1 , wherein the ferritic carbon nanotubes are a Ni—Cu ferritic carbon nanotube material.

3. The microwave heating appliance of claim 2 , wherein the ferritic carbon nanotubes have an average diameter of 1 to 75 nm.

4. The microwave heating appliance of claim 1 , wherein the ferromagnetic nanowires are a Co—Fe based ferromagnetic nanowires.

5. The microwave heating appliance of claim 1 , wherein the hybrid coating has an initial heating ramp of up to 960 degrees C./min.

6. The microwave heating appliance of claim 1 , wherein the polymer is silicon.

7. The microwave heating appliance of claim 1 , wherein the ferritic carbon nanotubes are loaded as 0.05 to 0.25% by weight of the coating.

8. The microwave heating appliance of claim 1 , wherein the hybrid coating has an overall thickness of 0.5 to 2.5 mm.

9. The microwave heating appliance of claim 1 , wherein the rapid heating plate reaches 250 degrees in 5 minutes when exposed to 950 W.

10. A rapid heating plate for a microwave heating appliance, the rapid heating plate comprising:

an aluminum substrate defining a surface for supporting food for heating thereon; and

a hybrid coating disposed on the surface, the hybrid coating including ferromagnetic nanowires and ferritic carbon nanotubes and configured to generate heat upon application of a magnetic field and upon absorption of microwave radiation from a microwave heating source.

11. The rapid heating plate of claim 10 , wherein the hybrid coating has an overall thickness of 0.5 to 2.5 mm.

12. The rapid heating plate of claim 10 , wherein the ferritic carbon nanotubes are 0.05 to 0.25% by weight of the hybrid nanocoating.

13. The rapid heating plate of claim 10 , wherein the ferritic carbon nanotubes are a Ni—Cu ferrite carbon nanotube material.

14. The rapid heating plate of claim 10 , wherein the rapid heating plate reaches 250 degrees in 5 minutes when exposed to 950 W.

15. The rapid heating plate of claim 10 , wherein the ferritic carbon nanotubes have an average diameter of 1 to 75 nm.

16. The rapid heating plate of claim 10 , wherein the ferromagnetic nanowires are a Co—Fe based ferromagnetic nanowires.

17. A method of forming a rapid heating plate for a microwave appliance, the method comprising:

mixing ferromagnetic nanowires with ferritic carbon nanotubes in a liquid polymer to form a hybrid nanocoating;

depositing the hybrid nanocoating on a substrate to form a rapid heating plate; and

curing the rapid heating plate to form a coating having an initial heat ramp of up to 960 degrees C. per minute.

18. The method of claim 17 , wherein the ferritic carbon nanotubes are a Ni—Cu ferrite carbon nanotube material.

19. The method of claim 18 , wherein the ferritic carbon nanotubes are 0.05 to 0.25% by weight of the hybrid nanocoating.

20. The method of claim 17 , wherein the liquid polymer is liquid silicon.

Assignments (1)

Continuity (1)

References Cited (10)