Strengthening of Glass and Pyroceram With Hydrophobic Coatings

Abstract

The objective of this study was to determine whether significant improvements in strength of soda-lime glass and Pyroceram 9606 could be obtained by applying thin hydrophobic coatings. Soda-lime glass slides were coated with a few different hydrophobic compounds (containing organosilicon groups) and then subjected to strength tests in flexure. The glass slides were acid etched to remove surface defects and to slightly mimic the outer fortified surface of Pyroceram. A hydrophobic coating of octadecyl dimethylchlorosilane on soda-lime glass slides led to doubling or more of the strength. The increase in strength is attributed to a reduced role of stress corrosion cracking that is promoted by moisture at the surface. Similar hydrophobic treatments were not effective on Pyroceram bars. Thick was coatings on dry Pyroceram surfaces were successful at improving the strength by about 40%, similar to the effects of dipping in silicone oil.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2003
Accession Number
ADA422231

Entities

People

  • Brandy L. Corley
  • Clare F. Kline Jr.
  • Curtis E. Johnson
  • Daniel C. Harris
  • John G. Nelson

Organizations

  • Naval Air Warfare Center Weapons Division

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Aerial Warfare
  • Alkanes
  • Anti-Radiation Missiles
  • Barometric Pressure
  • Body Weight
  • Chemistry
  • Corrosion
  • Cracks
  • Guided Missile Domes
  • Hydrophobic Properties
  • Materials
  • Melting Point
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Surface Chemistry
  • Weapons

Readers

  • Aerosol Science/Aerosol Physics
  • Analytical Chemistry
  • Materials Science (Mechanical Engineering).