Metallic honeycomb body with adhesion improving microstructures

A metallic honeycomb body, comprising:

• a plurality of channels through which a gas may flow;
• a plurality of layers of at least partially structured sheet metal, each of the plurality of channels being made from the plurality of layers of at least partially structured sheet metal;
• a plurality of subregions being part of the plurality of layers of at least partially structured sheet metal;
• a first plurality of structures, the first plurality of structures being of a first type and having a first height, the height of each of the first plurality of structures determining the size of each of the plurality of channels;
• a second plurality of structures, each of the second plurality of structures having a corresponding trough and a corresponding peak, the second plurality of structures being of a second type and having a second height (h) which is less than the first height, the second height (h) of each of the second plurality of structures extending between each corresponding trough and each corresponding peak;
• and
• a ceramic coating applied to each of the plurality of second structures such that the ceramic coating fills the troughs;
• wherein the ceramic coating on average fills the troughs of each of the plurality of second structures to at least 10%, preferably at least 20%, particularly preferably at least 30%, in particular at least 50%, of the second height (h) of each of the plurality of second structures.