A component for exposure to a combustion chamber of an internal combustion engine and/or exhaust gas generated by the internal combustion engine, comprising: a body portion formed of metal; a thermal barrier coating applied to said body portion and having a thickness (t) extending from said body portion to a top surface; wherein the thermal barrier coating includes: a first layer of metal bond material applied directly to said body portion formed of metal, and 5% to 20% of said thickness (t) of said thermal barrier coating consists of said layer of metal bond material; a gradient structure applied directly to said layer of metal bond material, which includes a mixture of said metal bond material and a ceramic material, and the amount of said ceramic material present in said gradient structure increases continuously from said first layer toward said top surface; and a layer of said ceramic material applied directly to said gradient structure and extending to said top surface, and 5% to 50% of said thickness (t) of said thermal barrier coating consists of said layer of said ceramic material; wherein said ceramic material includes ceria in an amount of 90 to 100 wt.%, or ceria stabilized zirconia in an amount of 90 to 100 wt.%, or a mixture of ceria stabilized zirconia and yttria stabilized zirconia in an amount of 90 to 100 wt.%, based on the total weight of the ceramic material; and when the ceramic material includes said mixture of ceria stabilized zirconia and yttria stabilized zirconia, the ceramic material includes the ceria stabilized zirconia in an amount of 5 to 95 wt.% and the yttria stabilized zirconia in an amount of 5 to 95 wt.%, based on the total amount of the mixture present in the ceramic material; and said component is selected from the group consisting of a cylinder liner, a cylinder head, a fuel injector, a valve seat, a valve face, a valve train, a surface of a post-combustion chamber, an exhaust manifold, and a turbocharger. a body portion formed of metal; a thermal barrier coating applied to said body portion and having a thickness (t) extending from said body portion to a top surface; wherein the thermal barrier coating includes: a first layer of metal bond material applied directly to said body portion formed of metal, and 5% to 20% of said thickness (t) of said thermal barrier coating consists of said layer of metal bond material; a gradient structure applied directly to said layer of metal bond material, which includes a mixture of said metal bond material and a ceramic material, and the amount of said ceramic material present in said gradient structure increases continuously from said first layer toward said top surface; and a layer of said ceramic material applied directly to said gradient structure and extending to said top surface, and 5% to 50% of said thickness (t) of said thermal barrier coating consists of said layer of said ceramic material; wherein said ceramic material includes ceria in an amount of 90 to 100 wt.%, or ceria stabilized zirconia in an amount of 90 to 100 wt.%, or a mixture of ceria stabilized zirconia and yttria stabilized zirconia in an amount of 90 to 100 wt.%, based on the total weight of the ceramic material; and when the ceramic material includes said mixture of ceria stabilized zirconia and yttria stabilized zirconia, the ceramic material includes the ceria stabilized zirconia in an amount of 5 to 95 wt.% and the yttria stabilized zirconia in an amount of 5 to 95 wt.%, based on the total amount of the mixture present in the ceramic material; and said component is selected from the group consisting of a cylinder liner, a cylinder head, a fuel injector, a valve seat, a valve face, a valve train, a surface of a post-combustion chamber, an exhaust manifold, and a turbocharger. a first layer of metal bond material applied directly to said body portion formed of metal, and 5% to 20% of said thickness (t) of said thermal barrier coating consists of said layer of metal bond material; a gradient structure applied directly to said layer of metal bond material, which includes a mixture of said metal bond material and a ceramic material, and the amount of said ceramic material present in said gradient structure increases continuously from said first layer toward said top surface; and a layer of said ceramic material applied directly to said gradient structure and extending to said top surface, and 5% to 50% of said thickness (t) of said thermal barrier coating consists of said layer of said ceramic material; wherein said ceramic material includes ceria in an amount of 90 to 100 wt.%, or ceria stabilized zirconia in an amount of 90 to 100 wt.%, or a mixture of ceria stabilized zirconia and yttria stabilized zirconia in an amount of 90 to 100 wt.%, based on the total weight of the ceramic material; and when the ceramic material includes said mixture of ceria stabilized zirconia and yttria stabilized zirconia, the ceramic material includes the ceria stabilized zirconia in an amount of 5 to 95 wt.% and the yttria stabilized zirconia in an amount of 5 to 95 wt.%, based on the total amount of the mixture present in the ceramic material; and said component is selected from the group consisting of a cylinder liner, a cylinder head, a fuel injector, a valve seat, a valve face, a valve train, a surface of a post-combustion chamber, an exhaust manifold, and a turbocharger.