Journal
ACTA MATERIALIA
Volume 58, Issue 15, Pages 4978-4985Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.05.031
Keywords
Sintering; Borides; Nanocrystalline materials; Electron backscattered diffraction; Texture
Funding
- National Natural Science Foundation of China [50871002]
- National Basic Research Program of China [2010CB833100]
Ask authors/readers for more resources
Nanostructured polycrystalline LaB6 ceramics were prepared by the reactive spark plasma sintering method, using boron nanopowders and LaH2 powders with a particle size of about 30 nm synthesized by hydrogen dc arc plasma. The reaction mechanism of sintering, crystal structure, microstructure, grain orientations and properties of the materials were investigated using differential scanning calorimetry, X-ray diffraction, Neutron powder diffraction, Raman spectroscopy, transmission electron microscopy and electron backscattered diffraction. It is shown that nanostructured dense LaB6 with a fibrous texture can be fabricated by SPS at a pressure of 80 MPa and temperature of 1300 degrees C for 5 min. Compared with the coarse polycrystalline LaB6 prepared by traditional methods, the nanostructured LaB6 bulk possesses both higher mechanical and higher thermionic emission properties. The Vickers hardness was 22.3 GPa, the flexural strength was 271.2 MPa and the maximum emission current density was 56.81 A cm(-2) at a cathode temperature of 1600 degrees C. (C) 2010 Ada Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available