Easy-clean cooking surface and electrical household appliance comprising such a surface

Abstract

The invention relates to a food cooking surface for a kitchen utensil or cooking device, characterized in that said cooking surface is either an amorphous metallic alloy or a nanocrystalline metallic alloy. According to the invention, the amorphous alloy has the formula AaDbEcXd where: A=Zr or Cu, D is at least one element selected from Ni, Cu, Al if A=Zr or at least one element selected from, Zr, Al if A=Cu, E=at least one element selected from Ti, or Hf, X=the impurities of production with 40%<a<70% at. %, 5%<b<30% at. %, c<10% at. %, d<1% at. %, and a+b+c+d=100% at. %.

1 . Food cooking surface for a kitchen utensil or cooking appliance, characterized in that this cooking surface is of an amorphous metal alloy.  
     
     
         2 . Cooking surface according to  claim 1 , characterized in that the alloy contains a nanocrystalline phase.  
     
     
         3 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 1 , characterized in that the alloy has the formule A a D b E c X d  in which: 
 A is one of the elements Zr or Cu,    D is at least one element chosen from the group consisting of Ni, Cu, Al if A is Zr or at least one element chosen from the group consisting if Ni, Zr, Al if A is Cu,    E is at least one element chosen from the group consisting of Ti, Hf,    X represents the impurities of production, with: 
 40%<a<70% at,  
 5%<b<30% at,  
 c<10% at,  
 d<1% At, and  
   a+b+c+d=100% at.    
     
     
         4 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 3 , characterized in that the metal alloy is of the formula Zr a Cu b Ni c Al d Ti e X f , 
 where a, b, c, d, e, are the respective proportions of Zr, Cu, Ni, Al and Ti in the alloy, said proportions being comprised within the following ranges:    40%<a<70%    10%<b<25%    5%<c<15%    5%<d<15%    2%<e<10%,    where x represents the impurities of production, with f <1% at,    where a+b+c+d+e+f=100% at.    
     
     
         5 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 1 , characterized in that it is obtained by the deposit of a suitable thickness of metallic material on a substrate.  
     
     
         6 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 5 , characterized in that the deposit is obtained by cathode sputtering of a massive target.  
     
     
         7 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 6 , characterized in that the target is obtained by assembly on a copper substrate of one or several sheets or plates of a material having the desired composition, said sheets or plates being obtained either by powder sintering or thermal projection of powder, or resulting from casting.  
     
     
         8 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 5 , characterized in that the material results from a powder of the alloy obtained by grinding of a crystallized alloy, said powder then undergoing a step of vitrification.  
     
     
         9 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 1 , characterized in that it is obtained by assembly of an amorphous alloy sheet on a substrate.  
     
     
         10 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 9 , characterized in that the sheet is obtained by rolling of an amorphous ingot resulting from melting of a mixture of metals.  
     
     
         11 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 9 , characterized in that the sheet is obtained by the technique of solidification on a wheel.  
     
     
         12 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 9 , characterized in that the assembly is carried out by one of the following techniques: colaminating, brazing, hot striking.  
     
     
         13 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 9 , characterized in that the sheet and the substrate undergo, after assembly, a step of forming by stamping.  
     
     
         14 . Food cooking surface for a kitchen utensil or cooking appliance according to  claim 5 , characterized in that the substrate is composed of one or more metal sheet(s) of the following materials: aluminum, stainless steel, cast iron, steel, copper.  
     
     
         15 . A kitchen utensil or cooking appliance having a food cooking surface as defined in  claim 1.