Metallic Borides: Preparation of Solid Bodies — Sintering Methods and Properties of Solid Bodies

Densification of ZrB2-based composites and their mechanical and physical properties: A review

“…The densification of ZrB 2 powder generally requires very high temperatures, 22 owing to the covalent character of the bonding as well as to its low volume and grain boundary diffusion rates. Typically, HP of ZrB 2 required a temperature of 2100 • C or above and moderate pressure (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) MPa), [23][24][25] or lower temperatures (∼1800 • C) and extremely high pressures (>800 MPa).…”

“…Typically, HP of ZrB 2 required a temperature of 2100 • C or above and moderate pressure (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) MPa), [23][24][25] or lower temperatures (∼1800 • C) and extremely high pressures (>800 MPa). 26,27 These studies [23][24][25][26][27] showed that densification of ZrB 2 is a diffusion-controlled rate process.…”

Stability of ultra-high-temperature ZrB2–SiC ceramics under simulated atmospheric re-entry conditions

“…1,3,5,9 From a technological point of view, the effective densification of ZrB 2 , due to strong covalent bondings and low selfdiffusion coefficients, typically requires sintering temperatures above 2000 • C and applied pressures in atmosphere-controlled furnaces. 12 Instead, several studies demonstrated that SiC added to ZrB 2 enhanced sinter ability and mechanical properties, 10,11 in addition to the resistance to oxidation 1,13-15 of the diboride alone. For ZrB 2 oxidised in air at elevated temperatures, ZrO 2 and liquid B 2 O 3 are formed.…”

In situ studies of oxidation of ZrB2 and ZrB2–SiC composites at high temperatures

“…Pure ZrB 2 is typically sintered around 2000 • C under an applied load in a controlled atmosphere furnace. 12 Numerous studies have focused on the use of alternate sintering methods to achieve dense ZrB 2 ceramics, such as * Corresponding author. Tel.…”