Method of altering the frequency of blades for thermal fluid-flow machines

• US 20050042384A1
• Filed: 07/16/2004
• Published: 02/24/2005
• Est. Priority Date: 01/22/2002
• Status: Abandoned Application

• Current Assignee: Alstom Technology Ltd. (Alstom SA)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Benedetti, Bruno, Kieninger, Andreas, Nagler, Christoph, Stengele, Joerg
• Application Number:
  US10/892,278
• Publication Number:
  US 20050042384A1
• Time in Patent Office: Days
• US Class Current: 427/446
• CPC Class Codes: C23C 4/00 Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge build-up welding B23K, e.g. B23K5/18, B23K9/04
• CPC Class Codes: F01D 5/16 for counteracting blade vibration
• CPC Class Codes: F05D 2230/311 by torch or flame spraying
• CPC Class Codes: F05D 2230/90 Coating; Surface treatment manufacture with deposition of material F05D2230/30

Abstract

A method of altering the frequency of blades (1) having an airfoil (2) with a suction side (6), a pressure side (5), a leading edge (10), a trailing edge (7) and a blade tip (9), and including a blade root (3), in particular turbine blades, for thermal fluid-flow machines. A metallic coating (8) formed of a material identical to the parent material is applied to the blade (1), already ready for use, in the region of the blade tip (9), the thickness of the coating (8) tapering continuously at the trailing edge (7) and in the radial direction toward the blade root (3).

Claims

1. A method of altering the frequency of blades, each blade formed of a parent material and includes an airfoil having a suction side, a pressure side, a leading edge, a trailing edge, and a blade tip, each blade including a blade root, the blades useful for thermal fluid-flow machines, the method comprising:

applying a metallic coating comprising a material identical to the parent material to the blade, said blade already ready for use, in the region of the blade tip, the thickness of the coating tapering continuously at the trailing edge and in the radial direction toward the blade root.

2. The method as claimed in claim 1, wherein applying the metallic coating comprises applying by flame spraying.

3. The method as claimed in claim 1, wherein the blades comprise turbine blades.