Journal of Materials Science

, Volume 39, Issue 19, pp 5939–5949 | Cite as

Designing for ultrahigh-temperature applications: The mechanical and thermal properties of HfB2, HfC x , HfN x and αHf(N)

  • E. Wuchina
  • M. Opeka
  • S. Causey
  • K. Buesking
  • J. Spain
  • A. Cull
  • J. Routbort
  • F. Guitierrez-Mora
Article

Abstract

The thermal conductivity, thermal expansion, Young's Modulus, flexural strength, and brittle-plastic deformation transition temperature were determined for HfB2, HfC0.98, HfC0.67, and HfN0.92 ceramics. The mechanical behavior of αHf(N) solid solutions was also studied. The thermal conductivity of modified HfB2 exceeded that of the other materials by a factor of 5 at room temperature and by a factor of 2.5 at 820°C. The transition temperature of HfC exhibited a strong stoichiometry dependence, decreasing from 2200°C for HfC0.98 to 1100°C for HfC0.67 ceramics. The transition temperature of HfB2 was 1100°C. Pure HfB2 was found to have a strength of 340 MPa in 4 point bending, that was constant from room temperature to 1600°C, while a HfB2 + 10% HfC x had a higher room temperature bend strength of 440 MPa, but that dropped to 200 MPa at 1600°C. The data generated by this effort was inputted into finite element models to predict material response in internally heated nozzle tests. The theoretical model required accurate material properties, realistic thermal boundary conditions, transient heat transfer analysis, and a good understanding of the displacement constraints. The results of the modeling suggest that HfB2 should survive the high thermal stresses generated during the nozzle test primarily because of its superior thermal conductivity. The comparison the theoretical failure calculations to the observed response in actual test conditions show quite good agreement implying that the behavior of the design is well understood.

Keywords

Thermal Boundary Condition Heat Transfer Analysis Displacement Constraint Transient Heat Transfer Bend Strength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • E. Wuchina
    • 1
  • M. Opeka
    • 1
  • S. Causey
    • 2
  • K. Buesking
    • 3
  • J. Spain
    • 2
  • A. Cull
    • 2
  • J. Routbort
    • 4
  • F. Guitierrez-Mora
    • 5
  1. 1.Naval Surface Warfare CenterW. BethesdaUSA
  2. 2.Southern Research InstituteBirminghamUSA
  3. 3.Materials Research & DesignPhiladelphiaUSA
  4. 4.Argonne National LaboratoryArgonneUSA
  5. 5.University of SevilleSevilleSpain

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