Premium
Strong ZrB 2 – SiC – WC Ceramics at 1600°C
Author(s) -
Zou Ji,
Zhang GuoJun,
Hu ChunFeng,
Nishimura Toshiyuki,
Sakka Yoshio,
Vleugels Jef,
Biest Omer
Publication year - 2012
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.1551-2916.2011.05062.x
Subject(s) - ceramic , flexural strength , materials science , composite material , transgranular fracture , fracture toughness , mineralogy , chemistry , grain boundary , microstructure , intergranular fracture
High temperature flexural strength of ZrB 2 –20 vol% SiC ceramics ( ZS ) up to 1600°C in high purity argon atmosphere was significantly improved by adding 5 vol% WC , but degraded when 5 vol% ZrC was added. ZrB 2 –20 SiC –5 WC ceramic ( ZSW ) has a very high strength (mean ± SD) of 675 ± 33 MPa at 1600°C, and also an elastic and transgranular fracture mode was observed. According to the analysis of the fracture modes and crack origins in ZSW ceramics, the improvement in strength above 1000°C was attributed to the removal of the oxide impurities from grain boundaries.