Open AccessHardness and fracture-toughness of hot-pressed LaB6-TiB2 ceramics
Author(s) -
Д. Д. Несмелов,
Е. С. Новоселов,
А. С. Лысенков,
С. В. Вихман,
С. Н. Перевислов
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/848/1/012059
Subject(s) - materials science , fracture toughness , eutectic system , ceramic , indentation , vickers hardness test , composite material , hot pressing , relative density , indentation hardness , metallurgy , microstructure
Microstructural analysis and investigations of mechanical properties via indentation-techniques have been performed on a LaB 6 - 15 vol. % TiB 2 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-m 1/2 ) were compared with the values, measured on a single-crystalline LaB 6 (Hv = 21 GPa, KI c = 2.4 MPa-m 1/2 ) and arc-melted eutectic composite LaB 6 -TiB 2 (Hv = 23 GPa, KI c = 6.7 MPa-m 1/2 ).