Insulating material capable of withstanding cyclically varying high temperatures

21:

• A heat insulation material on the basis of ceramic material comprising a top layer (4) containing BaZrO3 and Y2O3 doped ZrO2.

22:

• A heat insulation material in accordance with claim 21, wherein the top layer (4) consists of BaZrO3 and Y2O3 doped ZrO2.

23:

• A heat insulation material in accordance with claim 21, wherein the top layer (4) contains or consists of 10 to 50% by weight BaZrO3 and 50 to 90% by weight Y2O3 doped ZrO2.

24:

• A heat insulation material in accordance with claim 21, wherein the top layer (4) consists of 20% by weight BaZrO3 and 80% by weight Y2O3 doped ZrO2.

A heat insulation material in accordance with claim 21, wherein the top layer (4) contains or consists of 15 to 25% by weight BaZrO3 and 75 to 85% by weight Y2O3 doped ZrO2.

26:

• A heat insulation material in accordance with claim 21, wherein the top layer (4) consists of 20% by weight BaZrO3 and 80% by weight Y2O3 doped ZrO2.

27:

• A heat insulation material in accordance with claim 21, including at least one adhesion promotion layer (2) and, optionally, at least one intermediate layer (3) arranged between the adhesion promotion layer (2) and the top layer (4).

28:

• A heat insulation material in accordance with claim 27, wherein the at least one adhesion promotion layer (2) contains MeCrAlY, where Me is nickel and/or cobalt.

29:

• A heat insulation material in accordance with claim 28, wherein the at least one adhesion promotion layer (2) consists of MeCrAlY, where Me is nickel and/or cobalt.

30:

• A heat insulation material in accordance with claim 27, wherein the at least one intermediate layer (3) contains Y2O3 doped ZrO2.

31:

• A heat insulation material in accordance with claim 30, wherein the at least one intermediate layer (3) consists of Y2O3 doped ZrO2.

32:

• A heat insulation material consisting of at least one adhesion promotion layer (2), at least one intermediate layer (3) arranged thereon and a top layer (4) arranged thereon, with the adhesion promotion layer (2) consisting of MeCrAlY, where Me is nickel and/or cobalt, the intermediate layer (3) consists of Y2O3 doped ZrO2 and the top layer (4) consists of 15 to 25% by weight BaZrO3 and 75 to 85% by weight Y2O3 doped ZrO2.

33:

• A method of coating a substrate (1) with a heat insulation material including the step of applying a top layer (4) containing or consisting of BaZrO3 and Y2O3 doped ZrO2 to an optionally coated substrate (1) by one of a thermal spray method, an electron beam method, high velocity flame spraying and plasma spraying.

34:

• A method of coating a substrate (1) with a heat insulation material consisting of at least one adhesion promotion layer (2), at least one intermediate layer (3) arranged thereon and a top layer (4) arranged thereon, with the adhesion promotion layer (2) consisting of MeCrAlY, where Me is nickel and/or cobalt, the intermediate layer (3) consists of Y2O3 doped ZrO2 and the top layer (4) consists of 15 to 25% by weight BaZrO3 and 75 to 85% by weight Y2O3 doped ZrO2, the method including the step of applying the top layer (4) to an optionally coated substrate (1) by a thermal spray method or an electron beam method.

35:

• A method in accordance with claim 33, wherein BaZrO3 in powder form and Y2O3 doped ZrO2 in powder form are mixed with one another before the application of the top layer (4) and this powder mixture is applied to the optionally coated substrate (1) by a thermal spray method or an electron beam method.

36:

• A method in accordance with claim 34, wherein BaZrO3 with a grain size between 1 and 2 μm and/or Y2O3 doped ZrO2 with a grain size between 5 and 25 μm is/are used to manufacture the powder mixture.

37:

• A method in accordance with claim 34, wherein the BaZrO3 is pressed to form a pressed body, using a bonding aid, and is sintered to form a solid ceramic material before the mixing with the Y2O3 doped ZrO2 before the ceramic material obtained in this manner is prepared as a powder with a grain size between 10 and 125 μm by means of a jaw crusher and/or a ball mill.

38:

• A method in accordance with claim 33, wherein the substrate (1) is an Al piston alloy or an Ni-based super alloy.

39:

• A method in accordance with claim 33, wherein the substrate (1) is coated with an adhesion promotion layer (2), and optionally an intermediate layer (3) arranged thereon, before the application of the top layer (4).

40:

• A method in accordance with claim 39, wherein the adhesion promotion layer (2) consists of MeCrAlY, where Me is nickel and/or cobalt.

41:

• A method in accordance with claim 39, wherein the intermediate layer (3) consists of Y2O3 doped ZrO2.

42:

• A method in accordance with claim 39, wherein the adhesion promotion layer (2) and/or the intermediate layer (3) is/are applied to the substrate (1) by a thermal spray method or an electronic beam method, preferably by plasma spraying.