Abstract

Microstructural analysis and investigations of mechanical properties via indentation-techniques have been performed on a LaB6 - 15 vol. % TiB2 ceramics, obtained by the hot-pressing at T = 1900 °C and P = 30 MPa in argon gas. The relative density of hot-pressed material was up to 97% of theoretical. XRD, SEM and EDX analysis of ceramics were performed. The Vickers hardness (18.5 GPa) and fracture-toughness (3.9 MPa-m1/2) were compared with the values, measured on a single-crystalline LaB6 (Hv = 21 GPa, KIc = 2.4 MPa-m1/2) and arc-melted eutectic composite LaB6-TiB2 (Hv = 23 GPa, KIc = 6.7 MPa-m1/2).

Details

Title
Hardness and fracture-toughness of hot-pressed LaB6-TiB2 ceramics
Author
Nesmelov, D D 1 ; Novoselov, E S 1 ; Lysenkov, A S 2 ; Vikhman, S V 1 ; Perevislov, S N 3 

 Saint-Petersburg State Institute of Technology, Saint-Petersburg, Russia 
 Baykov Metallurgy and Materials Institute (IMET RAS), Moscow, Russia 
 Grebenschikov Institute of Silicate Chemistry (ISC RAS), Saint-Petersburg, Russia 
Publication year
2020
Publication date
May 2020
Publisher
IOP Publishing
ISSN
17578981
e-ISSN
1757899X
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2562476076
Copyright
© 2020. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.