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The invention relates to a material based on an oxide ceramic for the manufacture of a surface layer (5) by means of a thermal coating process including aluminum oxide and zirconium oxide, with the material additionally containing chromium oxide for the simultaneous optimization of the hardness and

The invention relates to a material based on an oxide ceramic for the manufacture of a surface layer (5) by means of a thermal coating process including aluminum oxide and zirconium oxide, with the material additionally containing chromium oxide for the simultaneous optimization of the hardness and toughness of the surface layer (5).

대표청구항 ▼

The invention claimed is: 1. A material on the basis of an oxide ceramic for the manufacture of a surface layer by means of a thermal coating process, the material including between 40% and 80% by weight of Al2O3, between 10% and 40% by weight of ZrO2, up to 35% by weight Cr2O3 and up to 20% by wei

The invention claimed is: 1. A material on the basis of an oxide ceramic for the manufacture of a surface layer by means of a thermal coating process, the material including between 40% and 80% by weight of Al2O3, between 10% and 40% by weight of ZrO2, up to 35% by weight Cr2O3 and up to 20% by weight TiO2 for the simultaneous optimization of the hardness and toughness of the surface layer, wherein the material additionally contains yttrium oxide. 2. A material in accordance with claim 1 comprising up to 20% by weight of Y2O3. 3. A material on the basis of an oxide ceramic for the manufacture of a surface layer by means of a thermal coating process, the material including between 40% and 80% by weight of Al2O3, between 10% and 40% by weight of ZrO2, up to 35% by weight Cr2O3 and up to 20% by weight TiO2 for the simultaneous optimization of the hardness and toughness of the surface layer, wherein the material is a thermal spraying powder manufactured by at least one of melting and casting and at least one of subsequent breaking and screening. 4. A material in accordance with claim 3, wherein the particle size of the spray powder lies between 1 μm and 90 μm. 5. A material in accordance with claim 4 wherein the particle size is between 5 μm and 45 μm. 6. A surface layer applied by thermal spraying on the basis of an oxide ceramic including between 40% and 80% by weight Al2O3, between 10% and 40% by weight ZrO2, up to 35% by weight Cr2O3 and up to 20% by weight of TiO2 for the simultaneous optimization of the hardness and toughness, wherein the surface layer additionally contains yttrium oxide. 7. A surface layer in accordance with claim 6 comprising up to 20% by weight of Y2O3. 8. A surface layer applied by thermal spraying on the basis of an oxide ceramic including between 40% and 80% by weight Al2O3, between 10% and 40% by weight ZrO2, Lip to 35% by weight Cr2O3 and up to 20% by weight of TiO2 for the simultaneous optimization of the hardness and toughness, wherein Al2O3 is present in the surface layer as crystalline alumina α phase and/or as crystalline alumina γ phase. 9. A surface layer applied by thermal spraying on the basis of an oxide ceramic including between 40% and 80% by weight Al2O3, between 10% and 40% by weight ZrO2, up to 35% by weight Cr2O3 and up to 20% by weight of TiO2 for the simultaneous optimization of the hardness and toughness, wherein ZrO2 is present as at least one of a monoclinic phase and a tetragonal phase. 10. A surface layer applied by thermal spraying on the basis of an oxide ceramic including between 40% and 80% by weight Al2O3, between 10% and 40% by weight ZrO2, up to 35% by weight Cr2O3 and up to 20% by weight of TiO2 for the simultaneous optimization of the hardness and toughness, wherein the surface layer has a micro-hardness HV0.3 between 500 HV0.3 and 1200 HV0.3. 11. A surface layer in accordance with claim 10 wherein the surface layer has a micro-hardness between 800 HV0.3 and 850 HV0.3. 12. A coating process for the application of a surface layer comprising providing an oxide ceramic including between 40% and 80% by weight Al2O3, between 10% and 40% by weight ZrO2, up to 35% by weight Cr2O3 and up to 20% by weight of TiO2 and applying the oxide ceramic with one of an atmospheric plasma spraying process, a low pressure plasma spraying process, a flame spraying process and a high speed flame spraying process. 13. A compressor for the compression of a fluid comprising a compression piston movably disposed in a compression chamber and an oxide ceramic surface layer including between 40% and 80% by weight Al2O3, between 10% and 40% by weight ZrO2, up to 35% by weight Cr2O3 and up to 20% by weight of TiO2 formed on a boundary wall of the compression chamber. 14. A compressor in accordance with claim 13, wherein the compressor is a reciprocating piston compressor, including a compression chamber bounded by a cylinder having a cylinder wall which is provided with the surface layer and in which cylinder a reciprocating piston is arranged for to and fro movement for the compression of the fluid, wherein a diameter of the cylinder lies between 40 mm and 80 mm. 15. A compressor in accordance with claim 14 wherein the diameter of the cylinder is between 50 mm and 60 mm. 16. A compressor according to claim 13 comprising an oil-free compressor. 17. A surface layer applied by thermal spraying on the basis of an oxide ceramic including between 40% and 80% by weight Al2O3, between 10% and 40% by weight ZrO2, between 5% and 35% by weight Cr2O3 and up to 20% by weight of TiO2 for the simultaneous optimization of the hardness and toughness.