Nondestructive Evaluation of Carbon-Carbon Coatings

Abstract

General Electric, with Southern Research Institute as subcontractor, completed this program to investigate differential-adsorption, nondestructive evaluation for carbon-carbon coatings. An optimum fluorescent particle and application method were developed to visualize crack patterns in the coatings. A stress-analysis model was developed to predict crack spacing as a function of coating properties, and this provided excellent agreement with experimental results. A study was made of the potential to improve oxidation life by adding glass-formers to the fluorescent particle suspension. A number of methods for measurement of coating thickness were investigated, and eddy current measurement was found to be the most accurate. Keywords: Differential adsorption, Finite- element modeling.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1987
Accession Number
ADA189524

Entities

People

  • D. C. Copley
  • M. Rooney

Organizations

  • General Electric

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Biomedical
  • Weapons Technologies

DTIC Thesaurus Topics

  • Antioxidants
  • Body Weight
  • Coatings
  • Elastic Properties
  • Materials
  • Materials Laboratories
  • Measurement
  • Microcapsules
  • Modulus Of Elasticity
  • Particle Size
  • Scattering
  • Silicon Carbide
  • Stresses
  • Thermal Expansion
  • Thermal Stresses
  • Turbines
  • X-Ray Computed Tomography

Readers

  • Structural Health Monitoring of Composite Structures.
  • Surface Engineering/Surface Coating Technology.
  • Technical Research and Report Writing.

Technology Areas

  • Space