Coating system for clearance control in rotating machinery

a technology for rotating machinery and sealing systems, which is applied in the direction of machines/engines, liquid fuel engines, superimposed coating processes, etc., can solve the problems of affecting the sealing effect, so as to reduce the loss of blade tips, improve sealing effect, and reduce the effect of sealing temperatur

Inactive Publication Date: 2011-07-07
PRAXAIR ST TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes an innovation called Abrasion-resistant coatings (ABRs) which are used during gas turbines or engines' operation to reduce damage caused by rubbing contact between parts like blades and other components such as bearings. These ABRs have special properties with respect to preventing small particles from getting inside these machines while still working properly. They can be made up of different types of material - Ceramics versus metal ones – providing better performance at high temperature compared to traditional methods.

Problems solved by technology

Gas Turbines (GTR) have two main technical problem: they use materials like Titanum Aluminide Blades called Stirring Vanes (SGV), but experience rapid temperature changes due to factors like cooler core exhaust gasses passing through the GTR system. To prevent contact between parts during normal operations, lubricants were added beforehand. However, excessive wear occurs because some areas get covered with metal scraps creating an insufficient amount of oil film. Lubrification films help protect the steel part from corrosion caused by oxygen-containing atmospheric agents released into the atmosphere.

Method used

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Embodiment Construction

[0011]As indicated above, this invention relates in part to a gas turbine engine seal system comprising a rotating member having an abrasive tip surface disposed in rub relationship to a stationary abradable seal surface, wherein said abrasive tip surface comprises an abrasive coating deposited onto at least a portion of the tip surface, wherein said abrasive coating comprises a metallic alloy matrix having ceramic abrasive particles at least partially embedded in said matrix and at least some of the ceramic abrasive particles projecting from said matrix, wherein said ceramic abrasive particles are selected from alumina polycrystal, alumina single crystal (sapphire), chromia-doped alumina single crystal (ruby), yttria-alumina garnet (YAG), titania-doped alumina polycrystal or single crystal (emerald), SiAlON, SiC, Si3N4 or diamond; wherein said abradable seal surface comprises an abradable ceramic coating deposited onto at least a portion of the seal surface; and wherein said gas turbi

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Abstract

The invention relates to gas turbine engine seal systems having a rotating member with an abrasive tip surface disposed in rub relationship to a stationary seal member with an abradable surface. The abrasive tip surface is coated with a metallic alloy matrix having ceramic abrasive particles embedded in and projecting from the matrix. The abradable seal surface is coated with a ceramic coating. The rub relationship affords a tight operating clearance between the rotating member and the stationary seal member, thereby improving engine efficiency, reducing fuel consumption and minimizing overhaul downtime.

Description

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Claims

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Application Information

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Owner PRAXAIR ST TECH INC
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