Sintering behaviour and phase reactions of TiB2 with ZrO2 additives

Preferential Grain Orientation in Hot Pressed TiB2

“…Hot pressing has the advantage of achieving a higher density at lower temperatures and sintering times compared with conventional sintering. Hot pressing of TiB 2 has also been reported by several authors, 7–14 and homogeneous microstructures have been reported. In this communication, preferential orientations in hot‐pressed TiB 2 material are reported.…”

Correlation between phase evolution, mechanical properties and instrumented indentation response of TiB2-based ceramics

“…It can be observed that monolithic TiB 2 could be densified to only ∼ 91% of the theoretical density on hot pressing at 1700 • C. However, raising the temperature to 1800 • C results in achieving ∼96% ρ th with monolithic TiB 2 (HP; 1800 • C), which is in accordance with earlier reports. 9,26,27 Further observation of Table 1 reveals that the addition of only a small amount (2.5 wt.%) of MoSi 2 to TiB 2 (T2.5M) leads to the achievement of ∼99% ρ th , even on hot pressing at the lower temperature of 1700 • C. Hence MoSi 2 , as sinter-additive, is effective in obtaining near theoretical densification of TiB 2 -based ceramics at lower processing temperature. However, with the increase in MoSi 2 additive content (up to 10 wt.%), the sinter densities (HP; 1700 • C) appear to decrease to a modest extent, although the densities of all the MoSi 2 containing composites are still higher than that of monolithic TiB 2 (HP; 1800 • C).…”

Processing and Properties of TiB2 with MoSi2 Sinter‐additive: A First Report

“…Watanabe and Shoubu 19 reported the formation of a (Ti,Zr)B 2 solid solution in hot‐pressed TiB 2 –30 wt% ZrO 2 composites. Telle et al 6 also observed the formation of a (Zr,Ti)O 2 solid solution in addition to a (Ti,Zr)B 2 solid solution, when 25 vol% ZrO 2 was added to TiB 2 . In another interesting investigation, Torizuka et al 10 did not report any solid solution formation when 20 wt% ZrO 2 binder was used to densify TiB 2 via the HIP route.…”

“…Different non‐metallic additives such as AlN, 5 ZrO 2 , 6–12 SiC, 8,10,12,13 Si 3 N 4 , 14 CrB 2 , 15 B 4 C, 9,16 TaC, 17 TiC, 17,18 WC, 17 TiN, 17 ZrN, 17 and ZrB 2 17 have been used for attaining densification of TiB 2 with good mechanical properties. Torizuka and Kishi 8 and Torizuka et al 12 observed the formation of grain‐boundary liquid phase (amorphous SiO 2 ) when SiC was used as an additive.…”