Densification behavior and microstructure development in TiB2 ceramics doped with h-BN

Nguyen, Thang Phan; Mahaseni, Zahra Hamidzadeh; Germi, Mohammad Dashti; Delbari, Seyed Ali; Le, Quyet Van; Ahmadi, Zohre; Shokouhimehr, Mohammadreza; Asl, Mehdi Shahedi; Namini, Abbas Sabahi

doi:10.1016/j.ceramint.2020.04.223

Cited by 62 publications

(21 citation statements)

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“…TiB 2 and hBN are synthesized by in situ reactions and have high sintering activity. Meanwhile, the layered and uniformly dispersed hBN can act as a lubricant and diffusion channel in the sintering process [ 25 , 26 ]. Therefore, when the TiB 2 –hBN content is low, the relative density of TiN–TiB 2 –hBN composite cannot be high.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of TiN–TiB2–hBN Composites Fabricated by Reactive Hot Pressing Using TiN–B Mixture

Tian

Shi

et al. 2021

Materials

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In this study, TiN–TiB2–hBN composite ceramics were prepared via reactive hot pressing using TiN and amorphous B powders as raw materials. Different sintering temperatures and composition ratios were studied. The results show that the 70 vol% TiN–17.6 vol% TiB2–12.4 vol% hBN ceramic composites obtained ideal comprehensive properties at 1600 °C. The relative density, Vickers hardness, bending strength, and fracture toughness were 99%, 11 GPa, 521 MPa, and 4.22 MPa·m1/2, respectively. Densification was promoted by the highly active reaction product TiB2, and the structural defects formed in the grains. Meanwhile, the good interfacial bonding between TiN and TiB2 grains and the uniform dispersion of ultrafine hBN in the matrix contributed to the excellent bending strength. Moreover, the toughening mechanism of crack deflection and grain pull-out improved the fracture toughness.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of TiN–TiB2–hBN Composites Fabricated by Reactive Hot Pressing Using TiN–B Mixture

Tian

Shi

et al. 2021

Materials

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“…Having such diverse features has made TiB 2 an appropriate candidate for several applications, including armors, cutting tools, turbine blades, Hall-Heroult cells' cathodes, abrasion, and corrosion resistance compounds, etc. [6,7]. However, this notable substance had some demerits, e.g.…”

Section: Introductionmentioning

confidence: 98%

“…Besides, both microstructural observations and XRD patterns verified the in-situ formation of the h-BN ingredient owing to a chemical reaction between the introduced AlN and the surface oxide of B 2 O 3 . The TiB 2 -BN system was also studied by Nguyen et al [7]. It was reported that the nucleation and growth of nano-sized BN platelets had a significant effect on the sinterability of such a system, reaching a near fully dense composite.…”

Section: Introductionmentioning

confidence: 99%

Pulsed electric current sintering of TiB2-based ceramics using nitride additives

et al. 2021

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In this research, various types of nitride additives were incorporated into titanium diboride attaining dense TiB2-based ceramics by field-assisted sintering technique. The addition of different types of nitride additives, namely Si3N4, BN, AlN, and TiN, significantly improved the sinterability of TiB2, achieving near fully dense ceramics. The X-ray diffraction analysis and microstructural evaluation confirmed the presence of the h-BN compound in all specimens. In the TiB2-Si3N4 ceramic, Si3N4 additive reacted with B2O3 oxide, in-situ generating h-BN, and SiO2 phases. Although the h-BN phase was produced in the TiB2-AlN specimen, the main proportion of AlN remained in the sample as an unreacted ex-situ phase. In terms of the TiB2-TiN ceramic, some of the nitrogen and boron atoms could leave the TiN and TiB2 crystalline structures, contributing to the in-situ formation of h-BN.

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“…Titanium diboride (TiB 2 ) is a high temperature resistant ceramic material, with exceptional hardness, high melting point, good chemical stability, excellent electrical and thermal conductivity [1][2][3][4]. These properties make TiB 2 be applied in many industries, such as wear resistant devices, protective materials, ultra-high temperature refractory.…”

Section: Introductionmentioning

confidence: 99%

“…Fortunately, these drawbacks can be avoided by introducing the second phase. Many literatures have reported that the addition of second phases, including SiC, Si 3 N 4 , AlN, BN, TiN, TiC, TiSi 2 and Ti 3 AlC 2 , etc., greatly improves the sintering performance of TiB 2 , and the formed TiB 2 -based ceramics exhibit excellent properties [1][2][3][4][5][6][7][8]. Among various second phase additives, B 4 C is particularly noteworthy and TiB 2 -B 4 C has the potential to become one of the most attracting TiB 2 -based composites owing to the following reasons.…”

Section: Introductionmentioning

confidence: 99%

Influences of B₄C content and particle size on the mechanical properties of hot pressed TiB₂–B₄C composites

Zhao

Cao

et al. 2021

Journal of Asian Ceramic Societies

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TiB 2 ceramic has attracted many attentions due to its excellent performances both on mechanical and functional properties. However, it is still very difficult to obtain TiB 2 bulks with full densification. Herein, TiB 2 -B 4 C composites were prepared via hot pressing at 1900°C under the pressure of 35 MPa with TiB 2 and B 4 C as the raw materials. The influences of B 4 C content (0, 10 vol%, 20 vol% and 30 vol%) and particle size (0.50 µm, 3.12 µm and 7.09 µm) on the phase composition, relative density, microstructure and mechanical properties of TiB 2 -B 4 C composites were investigated. The using of 0.50 µm B 4 C brought more B 2 O 3 which induced oriented growth of TiB 2 grains and coarsened the obtained composites. When the raw B 4 C powders were 3.12 µm and 7.09 µm, the obtained composites with 20-30 vol% B 4 C could be fully densified. TiB 2 -30 vol% B 4 C composite prepared from 3.12 µm B 4 C powder resulted in the optimal mechanical properties. The bending strength, Vickers hardness, fracture toughness were 671 MPa, 27.93 GPa, and 3.91 MPa•m 1/2 , respectively. The excellent performance was attributed to its fine and homogenous microstructure.

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Densification behavior and microstructure development in TiB2 ceramics doped with h-BN

Cited by 62 publications

References 62 publications

Microstructure and Mechanical Properties of TiN–TiB2–hBN Composites Fabricated by Reactive Hot Pressing Using TiN–B Mixture

Microstructure and Mechanical Properties of TiN–TiB2–hBN Composites Fabricated by Reactive Hot Pressing Using TiN–B Mixture

Pulsed electric current sintering of TiB2-based ceramics using nitride additives

Influences of B₄C content and particle size on the mechanical properties of hot pressed TiB₂–B₄C composites

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Densification behavior and microstructure development in TiB2 ceramics doped with h-BN

Cited by 62 publications

References 62 publications

Microstructure and Mechanical Properties of TiN–TiB2–hBN Composites Fabricated by Reactive Hot Pressing Using TiN–B Mixture

Microstructure and Mechanical Properties of TiN–TiB2–hBN Composites Fabricated by Reactive Hot Pressing Using TiN–B Mixture

Pulsed electric current sintering of TiB2-based ceramics using nitride additives

Influences of B4C content and particle size on the mechanical properties of hot pressed TiB2–B4C composites

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Influences of B₄C content and particle size on the mechanical properties of hot pressed TiB₂–B₄C composites