“…The formation of such in-situ phases is highly important for ceramic-based composites. This phenomenon promotes solid diffusion and forms fresh fine particles with high activity, resulting in high relative densities and a strong binding of the matrix 58 . Figure 2 XRD pattern of C f -incorporated TiB 2 –SiC composite.…”
A carbon-fiber (Cf) doped TiB2–SiC composite was prepared and investigated to determine its densification behavior, micro/nanostructural properties, and mechanical characteristics. TiB2–25 vol% SiC–2 wt% Cf was prepared at 40 MPa and 1800 °C for 7 min using the pulsed electric-current sintering technique, and a relative density of 98.5% was realized. The as-sintered composite was characterized using advanced techniques, e.g., X-ray diffractometry, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, field-emission electron probe micro-analysis, and nanoindentation. The Cf additive could remove the surface oxide layers from the TiB2 and SiC domains, thus transforming them into TiB2 and SiC. According to micro/nanostructural studies, Cf could not retain its initial structure and was eventually converted into graphite nanosheets. In addition, the prepared composite was examined using the nanoindentation technique, and the following results were obtained for the calculated hardness, elastic modulus, and stiffness values: TiB2 > SiC > TiB2/SiC interface.
“…The formation of such in-situ phases is highly important for ceramic-based composites. This phenomenon promotes solid diffusion and forms fresh fine particles with high activity, resulting in high relative densities and a strong binding of the matrix 58 . Figure 2 XRD pattern of C f -incorporated TiB 2 –SiC composite.…”
A carbon-fiber (Cf) doped TiB2–SiC composite was prepared and investigated to determine its densification behavior, micro/nanostructural properties, and mechanical characteristics. TiB2–25 vol% SiC–2 wt% Cf was prepared at 40 MPa and 1800 °C for 7 min using the pulsed electric-current sintering technique, and a relative density of 98.5% was realized. The as-sintered composite was characterized using advanced techniques, e.g., X-ray diffractometry, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, field-emission electron probe micro-analysis, and nanoindentation. The Cf additive could remove the surface oxide layers from the TiB2 and SiC domains, thus transforming them into TiB2 and SiC. According to micro/nanostructural studies, Cf could not retain its initial structure and was eventually converted into graphite nanosheets. In addition, the prepared composite was examined using the nanoindentation technique, and the following results were obtained for the calculated hardness, elastic modulus, and stiffness values: TiB2 > SiC > TiB2/SiC interface.
“…The poor mechanical properties of T100 can be attributed to two reasons. One is that the oxides on TiB 2 powders surface (TiO 2 and B 2 O 3 ) inhibit the densification process of the ceramic during the sintering process 31,54 . Lacking sintering aids and reinforcement substances to promote sintering and suppress the grain growth of TiB 2 is another reason.…”
Section: Resultsmentioning
confidence: 99%
“…One is that the oxides on TiB 2 powders surface (TiO 2 and B 2 O 3 ) inhibit the densification process of the ceramic during the sintering process. 31,54 Lacking sintering aids and reinforcement substances to promote sintering and suppress the grain growth of TiB 2 is another reason. The compactness is obviously improved after adding SA and B 4 C. With the increase of B 4 C content, these defects are randomly distributed in the samples and increase sequentially, causing the relative density of the samples decreased.…”
Section: Sem-eds Analysismentioning
confidence: 99%
“…Accordingly, B 4 C is widely used in aerospace bulletproof armor plates, neutron absorbers in the nuclear field, and some engineering wear‐resistant parts. Nevertheless, it is hard to prepare pure boron carbide ceramic with high density owing to the existence of low sinterability (due to the B 2 O 3 oxide layer and strong B‐C covalently bond), low self‐diffusivity coefficients, lower plasticity, and lower surface energy, which severely obstruct its broad application to a certain extent 26–33 . Yamada et al 11 .…”
Section: Introductionmentioning
confidence: 99%
“…Nevertheless, it is hard to prepare pure boron carbide ceramic with high density owing to the existence of low sinterability (due to the B 2 O 3 oxide layer and strong B-C covalently bond), low self-diffusivity coefficients, lower plasticity, and lower surface energy, which severely obstruct its broad application to a certain extent. [26][27][28][29][30][31][32][33] At present, the sintering methods of fabricating ceramics and composite materials mainly include HP, pressureless sintering, SPS, reaction sintering, etc. 7,[36][37][38][39][40] SPS is an innovative sintering technique, which is based on the Joule heating process.…”
Spark plasma sintering (SPS) is an advanced sintering technique because of its fast sintering speed and short dwelling time. In this study, TiB2, Y2O3, Al2O3, and different contents of B4C were used as the raw materials to synthesize TiB2‐B4C composites ceramics at 1850°C under a uniaxial loading of 48 MPa for 10 min via SPS in vacuum. The influence of different B4C content on the microstructure and mechanical properties of TiB2‐B4C composites ceramics are explored. The experimental results show that TiB2‐B4C composite ceramic achieves relatively good comprehensive properties and exceptionally excellent flexural strength when the addition amount of B4C reaches 10 wt.%. Its relative density, Vickers hardness, fracture toughness, and flexural strength reach to 99.20%, 24.65 ± .66 GPa, 3.16 MPa·m1/2, 730.65 ± 74.11 MPa, respectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
