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Coatings for High-Temperature Structural Materials Trends and Opportunities (1996) / Chapter Skim
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3 MATERIALS AND PROCESSES
Pages 19-25

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From page 19...
... In addition, TBC patches are used to minimize thermomechanical fatigue cracking by reducing substrate temperatures at component hot spots. However, TBCs will not be widely accepted for use at temperatures that will result in the rapid degradation of substrate materials in order to provide the performance benefits of which they are capable until they can be produced with predictable, reliable properties, as discussed in chapter 1 (see figure 1-1~.
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From page 20...
... Coatings for Ceramics Current approaches for coating the silicon-based ceramic materials include the use of mullite coatings that have an excellent expansion match with silicon carbide (Van Roode et al., 1992; Lee et al., 1994~. While mullite contains silica, the aluminum in mullite promotes formation of a solid rather than a liquid oxidation product.
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From page 21...
... 2 diffusion coating on niobium has shown excellent cyclic oxidation resistance (Mueller et al., 1991) but has yet to be commercially developed.
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From page 22...
... Most overlay coatings for gas-turbine applications are currently applied using electron-beam physical vapor deposition (EB-PVD) , which is an atomistic deposition method, and low-pressure plasma spraying, which is a particulate deposition method.
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From page 23...
... Plasma spraying is the most widely used thermal spray technique for gas-turbine component overlay coating The microstructure of a plasma-sprayed coating depends on the starting material and its particle size distribution, as well as processing parameters. New and improved powder processing methods can produce starting materials with predictable and controllable compositions and well-delineated particle size.
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From page 24...
... depending on the type of coating and the process parameters selected. These methods are sometimes classified as chemical vapor deposition methods.
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From page 25...
... Failure modes are discussed in chapter 4. Other considerations arise from various engineering factors, such as the requirement that the coating must also be compatible with the bulk material of the component under the demanding condi 25 lions in a turbine engine.
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Key Terms

  • vapor deposition
  • thermal spray
  • refractory metals
  • diffusion coating
  • hot corrosion

  • diffusion coatings
  • particulate deposition
  • process parameters
  • oxidation resistance
  • coating process

  • physical vapor
  • deposition methods
  • carrier gas
  • plasma spraying
  • turbine engine

  • nondestructive evaluation
  • deposition method
  • evaluation methods
  • overlay coatings
  • improve component

  • curtail component
  • oxide coatings
  • severely curtail
  • coating processes
  • component durability

  • silicon carbide
  • coating methods
  • coating species
  • atomistic deposition
  • structural materials


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