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Coating material and method of manufacturing same, coating method, and moving blade with shroud

a technology of coating material and shroud, which is applied in the direction of waterborne vessels, climate sustainability, machines/engines, etc., can solve the problems of significant oxidative loss and deterioration of the function of the abrasion-resistant coating film, and achieve the effects of improving the stability of the cr2o3 and improving the oxidation resistance of the coating film

Inactive Publication Date: 2010-04-29
MITSUBISHI HEAVY IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0007]The present invention has been developed in light of the above circumstances, and has an object of providing a coating material, a method of manufacturing the coating material, and a coating method using the coating material that are capable of forming a coating film that retains high abrasion resistance while offering improved oxidation resistance at high temperatures, as well as providing a moving blade fitted with a shroud.
[0035]The present invention is able to provide a coating material, a method of manufacturing the coating material and a coating method using the coating material that are capable of forming a coating film that retains high abrasion resistance while offering improved oxidation resistance at high temperatures, as well as a moving blade fitted with a shroud.

Problems solved by technology

However, although the T-800 coating film has excellent ductility and high abrasion resistance, in the high-temperature gas turbines of recent years, the metal temperature at the tips of the three-stage moving blades reaches 750° C. or higher, causing significant oxidative loss and a deterioration in the function of the abrasion-resistant coating film.

Method used

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  • Coating material and method of manufacturing same, coating method, and moving blade with shroud
  • Coating material and method of manufacturing same, coating method, and moving blade with shroud
  • Coating material and method of manufacturing same, coating method, and moving blade with shroud

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first embodiment

[0045]A coating material, a method of manufacturing the coating material, a coating method, and a moving blade fitted with a shroud according to a first embodiment of the present invention are described below in detail by way of examples with reference to the drawings. However, the present invention is in no way limited by the examples presented below.

example 1 to example 7

[0046]Spray powders with the compositions of examples 1 to 7 shown in Table 1 were prepared by a gas atomization method using the device shown in FIG. 2.

[0047]A predetermined alloy component was superheated and melted inside a levitation furnace 12, and the molten matter was then drained through a nozzle hole of a spray nozzle 14 provided at the base of the tundish to create a thin flow of molten matter. An inert jet fluid (typically helium gas or the like) was blown onto the flow of molten matter from a position around the periphery of the flow, and the energy of this jet fluid caused the molten matter to flow downward into a spray chamber 16. The downward flow of molten matter was broken up into liquid droplets, which were solidified as they fell to produce an alloy powder. The alloy powder was separated from the exhaust gas by a cyclone 18 provided on the downstream side of the device, and was then collected in a powder collection vessel 20 provided beneath the cyclone.

[0048]Beca...

second embodiment

[0069]Deposition of the coating film may be performed using a HVAF (High Velocity Air Fuel) process instead of the HVOF process. In this case, a dense coating film with minimal oxides can be obtained. This improves the adhesion between the coating film on the contact surface 3 and the base material.

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Abstract

The present invention provides a coating material, a method of manufacturing the coating material and a coating method using the coating material that are capable of forming a coating film that retains high abrasion resistance while offering improved oxidation resistance at high temperatures, and also provides a moving blade fitted with a shroud. A coating material is used that comprises not less than 14% by mass and not more than 30% by mass of Mo, not less than 13% by mass and not more than 20% by mass of Cr, and not less than 0.5% by mass and not more than 4% by mass of Si, may further comprise not more than 1.5% by mass of Ni, not more than 1.5% by mass of Fe, and not more than 0.08% by mass of C, and comprises a balance of Co and unavoidable impurities, wherein the material further comprises at least one added component selected from the group consisting of not less than 0.01% by mass and not more than 3% by mass of Y, not less than 0.01% by mass and not more than 10% by mass of Al, and not less than 0.1% by mass and not more than 10% by mass of Fe.

Description

TECHNICAL FIELD[0001]The present invention relates to a coating material, a method of manufacturing the coating material, a coating method, and a moving blade fitted with a shroud.BACKGROUND ART[0002]FIG. 1 is a partial perspective view illustrating a moving blade fitted with a shroud. At the tip of this moving blade 1, a Z-type shroud 2 is formed that prevents fluid leakage and restrains torsion of the moving blade 1, and the shroud 2 has a contact surface 3 that contacts the shroud 2 of the adjacent moving blade 1. Furthermore, because the moving blade 1 is affected by various types of vibration caused by factors such as drift, nozzle passing of the stationary blade, and flutter, the contact surface 3 of the shroud 2 is typically subjected to an abrasion resistance treatment, conventionally by applying a coating film of Tribaloy 800 (T-800: a cobalt-based abrasion resistance material) by an APS (Atmospheric Plasma Spraying) process.[0003]However, with APS, a problem arises in that...

Claims

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Application Information

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IPC IPC(8): F01D5/22C23C4/08C22C19/07C22C30/00F01D5/28
CPCC22C19/07C23C4/06C23C4/18C23C4/127C23C4/124C23C4/129C23C4/134F01D5/225Y02T50/60
Inventor TORIGOE, TAIJIYUNOMURA, TOMOAKIOKADA, IKUOYANG, ZHI-GANG
Owner MITSUBISHI HEAVY IND LTD