Premium
Boron Carbide–Zirconium Boride In Situ Composites by the Reactive Pressureless Sintering of Boron Carbide–Zirconia Mixtures
Author(s) -
Goldstein Adrian,
Geffen Ygal,
Goldenberg Ayala
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00714.x
Subject(s) - boron carbide , materials science , boride , cubic zirconia , zirconium diboride , composite material , sintering , yttria stabilized zirconia , carbide , zirconium , zirconium carbide , boron , zirconium dioxide , boron oxide , vickers hardness test , oxide , ceramic , metallurgy , microstructure , chemistry , organic chemistry
The heating of B 4 C–YTZP (where YTZP denotes yttria‐stabilized zirconia polycrystals) mixtures, under an argon atmosphere, generates B 4 C–ZrB 2 composites, because of a low‐temperature (<1500°C) carbide–oxide reaction. Composites derived from mixtures that include ≥15% YTZP are better sintered than monolithic B 4 C that has been fired under the same conditions. Firing to ∼2160°C (1 h dwell) generates specimens with a bulk density of ≥91% of the theoretical density (TD) for cases where the initial mixture includes ≥15% YTZP. Mixtures that include 30% YTZP allow a fired density of ≥97.5% TD to be attained. The behavior of the B 4 C–YTZP system is similar to that of the B 4 C–TiO 2 system. Dense B 4 C–ZrB 2 composites attain a hardness (Vickers) of 30–33 GPa.