Densification and properties of transition metal borides-based cermets via spark plasma sintering
Densification and properties of transition metal borides-based cermets via spark plasma sintering
复制标题
DOI：
10.1016/j.jeurceramsoc.2005.05.011
复制
发表时间：
2006
影响因子：
5.7
通讯作者：
T. Venkateswaran;B. Basu;G. Raju;Doh-Yeon Kim
中科院分区：
文献类型：
--
作者：
T. Venkateswaran;B. Basu;G. Raju;Doh-Yeon Kim
Engineering borides like TiB2and ZrB2are difficult to sinter materials due to strong covalent bonding, low self-diffusion coefficient and the presence of oxide layer on the powder particles. The present investigation reports the processing of hard, tough and electrically conductive transition metal borides (TiB2and ZrB2) based cermets sintered with 6wt.% Cu using spark plasma sintering (SPS) route. SPS experiments were carried out with a heating rate of 500K/min in the temperature range of 1200–1500°C for a varying holding time of 10–15min and the optimization of the SPS conditions is established. A maximum density of ∼95% ρthin ZrB2/Cu and ∼99% ρthin TiB2/Cu is obtained after SPS processing at 1500°C for 15min. While the optimized TiB2/Cu cermet exhibits hardness and fracture toughness of ∼17GPa and ∼11MPam1/2, respectively, the optimized ZrB2/Cu cermet has higher hardness of ∼19GPa and fracture toughness of ∼7.5MPam1/2, respectively. High electrical conductivity of ∼0.20MΩ−1cm−1(TiB2/Cu) and ∼0.15MΩ−1cm−1(ZrB2/Cu) are also measured with the optimally sintered cermets.
