Piston with engineered crown coating and method of manufacturing

A piston, comprising:

• a body portion formed of metal;
• said body portion including a combustion surface, the combustion surface including a combustion bowl surrounded by a bowl rim;
• said combustion bowl extending radially from a center axis of said body portion to said bowl rim, and said bowl rim extending circumferentially around said combustion bowl;
• a high thermal conductivity material disposed on at least one first region of said combustion surface, said high thermal conductivity material having a thermal conductivity of at least 100 W/mK,
• a low thermal conductivity material disposed on at least one second region of said combustion surface different from said at least one first region, said low thermal conductivity material having a thermal conductivity of not greater than 1 W/mK, wherein said high thermal conductivity material disposed on said combustion surface has a surface roughness (Ra) of less than 5 μm;
• and said low thermal conductivity material disposed on said combustion surface has a surface roughness (Ra) of less than 3 μm.

A piston, comprising:

• a body portion formed of metal;
• said body portion including a combustion surface, the combustion surface including a combustion bowl surrounded by a bowl rim;
• a high thermal conductivity material disposed on at least one first region of said combustion surface, said high thermal conductivity material having a thermal conductivity of at least 100 W/mK;
• a low thermal conductivity material disposed on at least one second region of said combustion surface different from said at least one first region, said low thermal conductivity material having a thermal conductivity of not greater than 1 W/mK;
• and
• wherein said low thermal conductivity material is disposed on said bowl rim and/or a top ring land and has a surface roughness (Ra) of greater than 8 μm.

A piston, comprising:

• a body portion formed of metal;
• said body portion including a combustion surface, said combustion surface including a combustion bowl surrounded by a bowl rim;
• a high thermal conductivity material disposed on at least one first region of said combustion surface, said high thermal conductivity material having a thermal conductivity of at least 100 W/mK;
• a low thermal conductivity material disposed on at least one second region of said combustion surface different from said at least one first region, said low thermal conductivity material having a thermal conductivity of not greater than 1 W/mK, and said low thermal conductivity material being ceria stabilized zirconia.