2134/19338
Saranya Venugopal
Saranya
Venugopal
Daniel Doni Jayaseelan
Daniel Doni
Jayaseelan
Anish Paul
Anish
Paul
Vaidhy Vaidhyanathan
Vaidhy
Vaidhyanathan
J.G.P. Binner
J.G.P.
Binner
Peter M. Brown
Peter M.
Brown
Screw dislocation assisted spontaneous growth of HfB2 tubes and rods
Loughborough University
2015
untagged
Materials Engineering not elsewhere classified
Mechanical Engineering
2015-11-09 10:51:26
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Screw_dislocation_assisted_spontaneous_growth_of_HfB2_tubes_and_rods/9236885
The mechanism of anisotropic growth of HfB2 rods has been discussed in this study. HfB2 powder has been synthesized via a sol–gel-based route using phenolic resin, hafnium chloride, and boric acid as the source of carbon, hafnium, and boron
respectively, though a small number of comparative experiments involved amorphous boron as the boron source. The effects of calcination dwell time and Hf:C and Hf:B molar ratio on the purity and morphology of the final powder have been studied and the mechanism of anisotropic growth of HfB2
has been investigated. It is hypothesized that imperfect oriented attachment of finer HfB2 particles results in screw dislocations
in the coarser particles. The screw dislocation facilitates dislocation-driven growth of particles into anisotropic
HfB2 rods.