Ultrafine-grained boron carbide ceramics fabricated via ultrafast sintering assisted by high-energy ball milling

Zhang, Xiaorong; Zhang, Zhixiao; Nie, Bin; Chen, Huanyu; Wang, Guangshuo; Mu, Jingbo; Zhang, Xiaoliang; Che, Hongwei; Wang, Weimin

doi:10.1016/j.ceramint.2018.01.011

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…In addition to the perovskite phase crystalline particles, a large amount of amorphous phase can also be seen in the observation field. The inserted selected‐area electron diffraction pattern presents a few broad rings comprising desultory light spots, thereby also confirming the formation of partially amorphized nanopowder, agreeing well with the XRD results. Furthermore, energy disperse spectroscopy measurement is conducted on the randomly selected amorphous region in the nanopowder, and the result is shown in Figure C.…”

Section: Resultssupporting

confidence: 86%

Building submicron crystalline piezoceramics: One‐step pressureless sintering partially amorphized nanopowder

et al. 2018

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The key to miniaturization of piezoelectric devices is to build high-performance fine-grained piezoceramics. Although the preparation of fine-grained ceramics can be achieved by hot press sintering or spark plasma sintering, complex processes, and high costs hinder the popularization of such technologies. In this work, a onestep conventional pressureless sintering technique based on partially amorphized nano-precursors has been proposed for low-cost preparation of submicron-structured ceramics. Using this technology, 0.36BiScO 3 -0.64PbTiO 3 ceramics with an average particle size of 170 nm and a relative density of 95% can be prepared at temperature as low as 900°C, while the samples still have excellent piezoelectric properties (d 33 = 220 pC/N, g 33 = 40 × 10 −3 Vm/N). In the process of sintering partially amorphized nano-precursors, the initial densification rate is faster than the grain growth rate, which can be attributed to two effects promoting low temperature densification, one is the liquid phase sintering mechanism associated with the amorphous phase, and the other is the filling effect of small particles deposited at the grain boundaries. This work is simple and easy to implement, and it is expected to be extended to the preparation of other types of fine-grained ceramics.

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Section: Resultssupporting

confidence: 86%

Building submicron crystalline piezoceramics: One‐step pressureless sintering partially amorphized nanopowder

et al. 2018

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“…However, in the observation field, there is also a large amount of the amorphous phase. The electron diffraction pattern of the selected area in the inset shows some broad rings containing scattered light spots, which confirms the formation of the target powder in this workpartially amorphous nanopowders …”

Section: Resultssupporting

confidence: 66%

“…The electron diffraction pattern of the selected area in the inset shows some broad rings containing scattered light spots, which confirms the formation of the target powder in this workpartially amorphous nanopowders. 39 By using these partially amorphous nanopowders as precursors, the target structure design of IPB is realized when sintered at a low temperature of 950 °C (Figure 5a). Through the energy-disperse spectroscopy measurement results, it is found that the nanoparticles in the IPB region have the same elemental composition as the ceramic grains (Figure 5b,c).…”

Section: Selection Of Precursormentioning

confidence: 99%

Intergranular Particle Bridge Structure Design Strategy Boosts High-Temperature Energy Harvesting Performance of Fine-Grained Ceramics

Wang

Hou

et al. 2021

ACS Appl. Electron. Mater.

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The piezoelectric energy harvester (PEH) for self-powered high-temperature microsensors puts forward an urgent need for high-temperature fine-grained piezoceramics with a high piezoelectric charge coefficient (d 33 ), which is still a huge challenge for material design. This study proposes a design strategy for building an intergranular particle bridge (IPB) structure, which solves the bottleneck in high-temperature piezoceramics, that is, difficulty in obtaining both a dense and fine-grained structure together with high d 33 . The IPB has a dual function, that is, inhibiting the migration of the grain boundary during the densification process to achieve a fine-grained structure and assisting in the construction of hierarchical nanodomain patterns to increase the d 33 . Using partially amorphous nanopowders as the precursors, the 0.345BiScO 3 − 0.615PbTiO 3 −0.04Pb(In 1/2 Nb 1/2 )O 3 piezoceramics with an IPB structure prepared by pressureless sintering technology have an average grain size of only 0.26 μm and the d 33 is as high as 343 pC/N, which is significantly better than the previous works. More importantly, the PEH made of optimized materials has an excellent power generation capacity at a high temperature of 250 °C, showing important application prospects in driving high-temperature microsensors. The design strategy proposed in this work can provide a reference for the preparation of more high-performance fine-grained piezoceramics.

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“…Hence, although the densification of B 4 C and β-SiC is difficult due to grain growth during the sintering process [51,52] and its innate low self-diffusivity [53], obtaining dense (above 90% of theoretical density) B 4 C and β-SiC is important to measure their mechanical properties accurately. Therefore, to analyze the mechanical properties in and near the Hall-Petch and inverse Hall-Petch relationship, existing experimental results on the hardness and fracture toughness of B 4 C [8,50,[54][55][56][57][58][59][60][61][62][63][64][65][66] and β-SiC [13,48,52,[67][68][69][70][71] with a theoretical density over 90% were collected to plot grain size dependence curve in Figure 1a-d. To analyze their pure intrinsic mechanical properties, results of fabricated B 4 C and β-SiC without use of any sintering additives were used to plot Figure 1.…”

Section: Effect Of Grain Size On the Mechanical Properties Of B 4 C A...mentioning

confidence: 99%

Mechanical Properties and Deformation Behavior of Superhard Lightweight Nanocrystalline Ceramics

Jeong

Lahkar

et al. 2022

Nanomaterials

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Lightweight polycrystalline ceramics possess promising physical, chemical, and mechanical properties, which can be used in a variety of important structural applications. However, these ceramics with coarse-grained structures are brittle and have low fracture toughness due to their rigid covalent bonding (more often consisting of high-angle grain boundaries) that can cause catastrophic failures. Nanocrystalline ceramics with soft interface phases or disordered structures at grain boundaries have been demonstrated to enhance their mechanical properties, such as strength, toughness, and ductility, significantly. In this review, the underlying deformation mechanisms that are contributing to the enhanced mechanical properties of superhard nanocrystalline ceramics, particularly in boron carbide and silicon carbide, are elucidated using state-of-the-art transmission electron microscopy and first-principles simulations. The observations on these superhard ceramics revealed that grain boundary sliding induced amorphization can effectively accommodate local deformation, leading to an outstanding combination of mechanical properties.

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Ultrafine-grained boron carbide ceramics fabricated via ultrafast sintering assisted by high-energy ball milling

Cited by 8 publications

References 19 publications

Building submicron crystalline piezoceramics: One‐step pressureless sintering partially amorphized nanopowder

Building submicron crystalline piezoceramics: One‐step pressureless sintering partially amorphized nanopowder

Intergranular Particle Bridge Structure Design Strategy Boosts High-Temperature Energy Harvesting Performance of Fine-Grained Ceramics

Mechanical Properties and Deformation Behavior of Superhard Lightweight Nanocrystalline Ceramics

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