Coated substrate

A coated substrate for a hob, comprising:

• a substrate comprising a coating comprising a layer consisting of a composition A comprising yttrium and zirconium, wherein a content of zirconium in the composition A is 75 weight-% or less and a Martens hardness of the coating is 4.5 GPa or more, wherein, after a heat treatment, a color distance ΔE is 4.0 or less.

The coated substrate of claim 1, wherein the coating shows a peak between 33° and 36° and/or the coating shows a peak between 28° ad 30° in a 2-theta-scale of XRD analysis

A method for the production of a coated substrate, comprising the steps:

• providing a substrate;
• applying a layer consisting of a composition A comprising yttrium and zirconium by a physical vapor deposition process on the substrate to obtain the coated, wherein a content of zirconium in composition A is 75 weight-% or less.

An article, comprising:

• a coated substrate comprising a substrate comprising a coating comprising a layer consisting of a composition A comprising yttrium and zirconium, wherein a content of zirconium in the composition A is 75 weight-% or less and a Martens hardness of the coating is 4.5 GPa or more, wherein, after a heat treatment, a color distance ΔE is 4.0 or less, wherein the article is a hob, an oven, a table, a shower wall, a radiator, a car, a consumer electronic device, a mobile phone, a tablet, a watch, a smart watch, an optical filter, an interference filter, an anti-reflection filter, a mirror;
• an induction hob, a radiant hob or a gas hob.