Oxidation of ZrB2 powder in the temperature range of 650–800°C

Effect of graphite flake orientation on microstructure and mechanical properties of ZrB2–SiC–graphite composite

“…Without sintering additives, in historic studies, ZrB 2 ceramics have only been densified by HP at 2000 • C or higher with pressures of 20-30 MPa, or at reduced temperatures (1790-1840 • C) with much higher pressures (800-1500 MPa) [10]. Although these dense ZrB 2 ceramics have many advantages, their intrinsic characteristics, such as low fracture toughness (premature failure due to brittle fracture) and low ultrahigh temperature oxidation resistance, are still obstacles for them to be used widely [6,11]. One method has been to overcome these deficiencies by tailoring structure and composition to produce ZrB 2 based ceramics that are engineered to enhance densification while maintaining load-bearing capability such as incorporating SiC into the ZrB 2 ceramics.…”

Effect of surface oxidation on thermal shock resistance of ZrB 2 –SiC–ZrC ceramic at temperature difference from 800 to 1900 °C

“…The surface macrographs (not shown here) for the samples heated in vacuum are similar to one for the samples heated in air at the temperature difference ranging from 200 to 500 • C. Compared with the unquenched samples, the surface of the sample darkened when the temperature difference was higher 500 • C due to the slight surface oxidation of the sample. For example, ZrB 2 is oxidized to ZrO 2 and B 2 O 3 at above 650 • C [32]; SiC is oxidized to SiO 2 and CO 2 at above 900 • C [18]; ZrC is oxidized to ZrO 2 and CO 2 at above Z. Wang et al / Corrosion Science xxx (2015) xxx-xxx Fig. 3 and the obvious cracks are readily detected, compared with the sample before water quenching.…”

Cubic Zirconia Crystalline Surface Oxide Epitaxial Formation on ZrB₂(0001) Confirmed by Circularly-Polarized-Light Photoelectron Diffraction

“…The clean (0001) surface is terminated with a Zr layer [6]. The oxidization of ZrB 2 has been studied for a powder ZrB 2 [7,8] and a single crystal as a substrate for GaN epitaxial formation [9,10], as well as for a basic study of surface oxidation [11,12]. Recently, the oxidization of ZrB 2 nanoparticle has been reported by G. Zhao, et al in 2014 [13].…”