Year: 2026
Type: article
Abstract: ABSTRACT Interdiffusion of Zr and Hf in the diboride system was investigated. High‐purity zirconium diboride (ZrB 2 ) and hafnium diboride (HfB 2 ) were prepared by a combination of boro‐/carbothermal reduction synthesis and densification by spark plasma sintering. The bulk ceramics had relative densities of 99.3% for ZrB 2 and 99.7% for HfB 2 , and both ceramics were phase‐pure by x‐ray diffraction analysis. Diffusion couples of ZrB 2 and HfB 2 were annealed at temperatures ranging from 2000°C to 2200°C for times from 4 to 12 h. Zr and Hf elemental concentration profiles were measured using energy dispersive spectroscopy and analyzed using an algorithm based on a Boltzmann transformation of Fick's second law. The interdiffusion coefficients increased as the annealing temperature elevated, which indicates that the interdiffusion was a thermally activated process. The diffusion rate of Hf in ZrB 2 is smaller than that of Zr in HfB 2 due to the larger atomic mass and stronger bonding strength.
DOI: 10.1111/jace.70590
Institution: Missouri University of Science and Technology
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Awards: G1523888516, G7090116110, G7422888722
OpenAlex ID: W7130503475