Accession Number:

ADA470166

Title:

A Model for the Oxidation of Refractory Diborides (Preprint)

Descriptive Note:

Journal article

Corporate Author:

UES INC DAYTON OH

Report Date:

2007-05-01

Pagination or Media Count:

25.0

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.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE