A Model for the Oxidation of Refractory Diborides (Preprint)

Abstract

Hypersonic applications require materials that can withstand very high temperatures. Refractory diborides appear to be the most promising candidates for these applications, from the standpoint of resistance to oxidation and evaporative loss. In this work, a mechanistic model is presented that predicts the oxidation behavior of diborides of Zr, Hf and Ti. Using available thermodynamic data and literature data on vapor pressures, good correspondence is obtained between theory and experiments for weight gain, recession and scale thickness as a function of temperature and oxygen partial pressure.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2007
Accession Number
ADA470166

Entities

People

  • M. Opeka
  • Ronald J. Kerans
  • Triplicane A. Parthasarathy

Organizations

  • Universal Energy Systems

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Body Weight
  • Diffusion Coefficient
  • Equations
  • Experimental Data
  • High Temperature
  • Literature
  • Materials
  • Oxidation
  • Oxidation Resistance
  • Partial Pressure
  • Physical Properties
  • Resistance
  • Thickness
  • Transition Temperature
  • Vapor Pressure

Fields of Study

  • Materials science

Readers

  • Analytical Chemistry
  • Combustion and Flow Dynamics.
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Flight