| 摘要 |
<p>The turbine blade for the rotor of a turbine, comprises a blade (2) extending in radial direction, having a blade tip (9), where the blade is formed at the blade tip as crown (3) with an inner and outer crown edge extending in the radial direction, or as a shroud having a radially extending web with lateral edges, where the blade on its surface in certain areas is provided with a first protective layer (4) made of oxidation-resistant material. The first oxidation-resistant protective layer is a metallic layer such as MCrAlY layer. The turbine blade for the rotor of a turbine, comprises a blade (2) extending in radial direction, having a blade tip (9), where the blade is formed at the blade tip as crown (3) with an inner and outer crown edge extending in the radial direction, or as a shroud having a radially extending web with lateral edges, where the blade on its surface in certain areas is provided with a first protective layer (4) made of oxidation-resistant material. The first oxidation-resistant protective layer is a metallic layer such as MCrAlY layer. The first protective layer is arranged on the inner and/or outer crown edge or on the web edges and does not exist on the radially outwardly located blade tip of the turbine blade. The blade tip consists of a known laser hard surfacing layer constructed out of second wear- and oxidation-resistant protective layer (5). The second protective layer on the blade tip along the outer and/or inner crown edge or web edges overlaps partially with the first metallic protective layer. The metallic protective layer is covered by a ceramic thermal barrier layer, where the second oxidation and wear resistant protective layer partially overlaps with the metallic protective layer, but not with the ceramic thermal barrier layer. The wear- and oxidation resistant protective layer consists of an abrasive material and an oxidation-resistant metal binder material. The abrasive material is cubic boron nitride. The oxidation-resistant binder material contains a chemical composition having chromium (15-30 wt.%), aluminum (5-10 wt.%), yttrium (0.3-1.2 wt.%), silicon (0.1-1.2 wt.%), and nickel and cobalt (0-2 wt.%). The proportion of abrasive material in the protective layer increases in the radial direction to the outside. Between the first metallic protective layer and the second wear- and oxidation-resistant protective layer, an intermediate layer, which exclusively consists of oxidation-resistant binder material, is arranged, where the intermediate layer partially overlaps the first protective layer, and the second protective layer partially overlaps the intermediate layer. The turbine blade is a reconditioned turbine blade. The turbine blade in a previous service interval of the turbine is inserted without abrasive blade tip. The turbine blade is a new component. The turbine blade has a length, which is varied using the laser hard surfacing layer. An independent claim is included for a method for the production of a turbine blade.</p> |
