ELECTRODEPOSITION OF EROSION AND OXIDATION RESISTANT COATINGS FOR GRAPHITE.

Abstract

A literature survey resulted in the selection of the following ceramics for inclusion in the program: Ta and Hf borides and carbides, Nb and Si carbides, Band Si nitrides, Zr and W borides and Zr oxide. Twelve cermet coatings in 3 particle size ranges were coated on ATJ graphite blocks. Variations in thickness existed not only between different ceramics, but also between different particle ranges of the same ceramic. Cermet coatings with satisfactory appearance were produced from baths at room temperature or 100 F. Oxyactylene flame and high temperature oxidation tests were performed on graphite blocks coated with various cermet compositions. A sample with a W boride coating had a long life of 11.5 min. Hafnium carbide and a Zirconium boride plus 10% MoSi2 coatings gave superior performance. Preliminary erosion and metallographic tests were conducted.

Document Details

Document Type
Technical Report
Publication Date
Dec 18, 1961
Accession Number
AD0268767

Entities

People

  • E. Goodman
  • G. F. Bargero
  • J. Huminik

Tags

DTIC Thesaurus Topics

  • Coatings
  • Electrodeposition
  • Graphitic Materials
  • High Temperature
  • Literature Surveys
  • Long Life
  • Materials Processing
  • Oxidation
  • Particle Size
  • Particles

Fields of Study

  • Materials science

Readers

  • Surface Engineering/Surface Coating Technology.