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In a turbine blade for a gas-turbine engine impeller, which is rotationally mounted in a housing, the turbine blade has a blade tip, a leading-edge positioned upstream in the direction of flow, and trailing edge positioned downstream, and includes a blade section, which has a section depth parallel

In a turbine blade for a gas-turbine engine impeller, which is rotationally mounted in a housing, the turbine blade has a blade tip, a leading-edge positioned upstream in the direction of flow, and trailing edge positioned downstream, and includes a blade section, which has a section depth parallel to the direction of flow and a section thickness parallel to the direction of travel of the turbine blade. An abrasive coating, which has an effective length corresponding to the section thickness along the section depth, is applied to the blade tip, the abrasive coating of the blade tip brushing against an abrasion coating, which is introduced into the surrounding housing. Along the section depth, in particular in the region of the leading and trailing edges, the abrasive coating coming into contact with the abrasion coating has an effective length, which may always, continually or very frequently be greater, but at least equal to a predefined, minimum dimension.

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What is claimed is: 1. A turbine blade for a gas-turbine engine impeller rotationally mounted in a housing, comprising: a blade tip; a leading edge arranged upstream in a direction of flow; a trailing edge arranged downstream in the direction of flow; a blade section having a section depth paral

What is claimed is: 1. A turbine blade for a gas-turbine engine impeller rotationally mounted in a housing, comprising: a blade tip; a leading edge arranged upstream in a direction of flow; a trailing edge arranged downstream in the direction of flow; a blade section having a section depth parallel to the direction of flow and a section thickness parallel to a direction of travel of the turbine blade; and an abrasive coating provided on the blade tip and having an effective length corresponding to the section thickness along the section depth; wherein the blade tip with the abrasive coating is configured to brush against an abrasion coating provided on a surrounding housing, the abrasive coating provided on the blade tip arranged to contact the abrasion coating having an effective length along the section depth greater than and at least equal to a predefined, minimum dimension; wherein the abrasive coating has a flattened area in a region of at least one of the leading edge and the trailing edge, the flattened area substantially parallel to the direction of travel of the turbine blade and substantially perpendicular to the direction of flow. 2. The turbine blade according to claim 1, wherein the effective length of the flattened area is greater than and at least equal to the predefined, minimum dimension. 3. The turbine blade according to claim 1, wherein along the section depth, the predefined, minimum dimension of the effective length of the abrasive coating is exceeded at the blade tip in accordance with the flattened area in a region of the leading edge and the trailing edge parallel to the direction of travel of the turbine blade. 4. The turbine blade according to claim 1, further comprising at least one covering band locally bounded in the direction of travel of the turbine blade arranged in a region of the leading edge and the trailing edge, along the section depth, the predefined, minimum dimension of the effective length of the abrasive coating exceeded at the blade tip by the covering band. 5. The turbine blade according to claim 4, wherein the covering band includes an abrasive coating. 6. The turbine blade according to claim 4, wherein edges of the covering bands are arranged to follow a contour of the blade section on the blade tip. 7. The turbine blade according to claim 1, further comprising at least one covering band extending along a circumference of the blade section and locally bounded in the direction of travel of the turbine blade, along the section depth, the effective length of the abrasive coating at the blade tip exceeding the predefined, minimum dimension ensured by the covering band. 8. The turbine blade according to claim 7, wherein the covering band includes an abrasive coating. 9. The turbine blade according to claim 7, wherein edges of the covering bands are arranged to follow a contour of the blade section on the blade tip. 10. The turbine blade according to claim 1, further comprising at least one covering band extending around the blade section, along the section depth, the effective length of the abrasive coating at the blade tip exceeding the predefined, minimum dimension ensured by the flattened area and the covering band. 11. The turbine blade according to claim 10, wherein the covering band includes an abrasive coating. 12. A turbine blade for a gas-turbine engine impeller rotationally mounted in a housing, comprising: a blade tip; a leading edge arranged upstream in a direction of flow; a trailing edge arranged downstream in the direction of flow; a blade section having a section depth parallel to the direction of flow and a section thickness parallel to a direction of travel of the turbine blade; and an abrasive coating provided on the blade tip and having an effective length corresponding to the section thickness along the section depth; wherein the blade tip with the abrasive coating is configured to brush against an abrasion coating provided on a surrounding housing, the abrasive coating provided on the blade tip arranged to contact the abrasion coating having an effective length along the section death greater than and at least equal to a predefined, minimum dimension; the turbine blade further comprising a flattened area in a region of at least one of the leading edge and the trailing edge and covering bands arranged in the region of the leading edge and trailing edge, along the section depth, the effective length of the abrasive coating at the blade tip exceeding the predefined, minimum dimension ensured by the flattened area and the covering bands. 13. The turbine blade according to claim 12, wherein the covering bands include an abrasive coating. 14. The turbine blade according to claim 12, wherein the covering bands are arranged together without contact. 15. The turbine blade according to claim 12, wherein edges of the covering bands are arranged to follow a contour of the blade section of the blade tip. 16. A turbine blade for a gas-turbine engine impeller rotationally mounted in a housing, comprising: a blade tip; a leading edge arranged upstream in a direction of flow; a trailing edge arranged downstream in the direction of flow; a blade section having a section depth parallel to the direction of flow and a section thickness parallel to a direction of travel of the turbine blade; and an abrasive coating provided on the blade tip and having an effective length corresponding to the section thickness along the section depth; wherein the blade tip with the abrasive coating is configured to brush against an abrasion coating provided on a surrounding housing, the abrasive coating provided on the blade tip arranged to contact the abrasion coating having an effective length along the section depth greater than and at least equal to a predefined, minimum dimension; the turbine blade further comprising at least one covering band locally bounded in the direction of travel of the turbine blade arranged in a region of the leading edge and the trailing edge, along the section depth, the predefined, minimum dimension of the effective length of the abrasive coating exceeded at the blade tip by the covering band; wherein the covering bands are arranged together without contact. 17. A turbine blade for a gas-turbine engine impeller rotationally mounted in a housing, comprising: a blade tip; a leading edge arranged uDstream in a direction of flow; a trailing edge arranged downstream in the direction of flow; a blade section having a section depth parallel to the direction of flow and a section thickness parallel to a direction of travel of the turbine blade; and an abrasive coating provided on the blade tip and having an effective length corresponding to the section thickness along the section depth; wherein the blade tip with the abrasive coating is configured to brush against an abrasion coating provided on a surrounding housing, the abrasive coating provided on the blade tip arranged to contact the abrasion coating having an effective length along the section depth greater than and at least equal to a predefined, minimum dimension; the turbine blade further comprising at least one covering band extending along a circumference of the blade section and locally bounded in the direction of travel of the turbine blade, along the section depth, the effective length of the abrasive coating at the blade tip exceeding the predefined, minimum dimension ensured by the covering band; wherein the covering bands are arranged together without contact. 18. A turbine blade for a gas-turbine engine impeller rotationally mounted in a housing, comprising: a blade tip; a leading edge arranged upstream in a direction of flow; a trailing edge arranged downstream in the direction of flow; a blade section having a section depth parallel to the direction of flow and a section thickness parallel to a direction of travel of the turbine blade; and an abrasive coating provided on the blade tip and having an effective length corresponding to the section thickness along the section depth; wherein the blade tip with the abrasive coating is configured to brush against an abrasion coating provided on a surrounding housing, the abrasive coating provided on the blade tip arranged to contact the abrasion coating having an effective length along the section depth greater than and at least equal to a predefined, minimum dimension; the turbine blade further comprising a flattened area in a region of at least one of the leading edge and the trailing edge and at least one covering band extending around the blade section, along the section depth, the effective length of the abrasive coating at the blade tip exceeding the predefined, minimum dimension ensured by the flattened area and the covering band; wherein the covering bands are arranged together without contact. 19. A turbine blade for a gas-turbine engine impeller rotationally mounted in a housing, comprising: a blade tip; a leading edge arranged upstream in a direction of flow; a trailing edge arranged downstream in the direction of flow; a blade section having a section depth parallel to the direction of flow and a section thickness parallel to a direction of travel of the turbine blade; and an abrasive coating provided on the blade tip and having an effective length corresponding to the section thickness along the section depth; wherein the blade tip with the abrasive coating is configured to brush against an abrasion coating provided on a surrounding housing, the abrasive coating provided on the blade tip arranged to contact the abrasion coating having an effective length along the section depth greater than and at least equal to a predefined, minimum dimension; the turbine blade further comprising a flattened area in a region of at least one of the leading edge and the trailing edge and at least one covering band extending around the blade section, along the section depth, the effective length of the abrasive coating at the blade tip exceeding the predefined, minimum dimension ensured by the flattened area and the covering band; wherein edges of the covering bands are arranged to follow a contour of the blade section of the blade tip.