Spark plasma sintering of TiN–TiB2–hBN composites and their properties

Kitiwan, Mettaya; Ito, Akihiko; Goto, Takashi

doi:10.1016/j.ceramint.2014.11.144

Cited by 24 publications

(5 citation statements)

References 22 publications

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“…The generated hBN by in situ phase transformation ensures that there is a uniform distribution of 2D materials between ceramic grains, which is a remarkable advantage over other mixing methods. The soft-phase hBN with a lamellar structure uniformly distributed among ceramic particles, on the one hand, bonds ceramic particles to promote densification; on the other hand, it absorbs energy during crack propagation, thus improving the fracture toughness and strength [ 35 , 37 ]. Figure 5 i shows the interfacial structure between cBN and SiC w , and it can be observed that cBN and SiC form a good bonding interface, which implies that cBN and SiC w were well sintered and there is no amorphous or impurity phase between cBN and SiC w .…”

Section: Resultsmentioning

confidence: 99%

“…It was reported that the fracture toughness of Si 3 N 4 -graphene composites and B 4 C-graphene composites were substantially improved up 6.6 MPa·m 1/2 and 8.76 MPa·m 1/2 , which is 135% and 131% higher than that of the corresponding pure-phase ceramics, respectively [ 35 , 36 ]. Similar to graphene, hBN has also shown great promise as a reinforcement and has been used in several ceramic composites [ 37 , 38 , 39 , 40 , 41 , 42 ]. It was found that fracture toughness and flexural strength of B 4 C-10 vol.% hBN composite were 4.2 MPa·m 1/2 and 494 GPa, which were increased by ~75% and ~40% compared to the B 4 C ceramic in the absence of hBN, respectively [ 41 ].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of cBN-hBN-SiCw Nanocomposite with Superior Hardness, Strength, and Toughness

Sun

Zou

et al. 2022

Nanomaterials

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Nanocomposites with one-dimensional (1D) and two-dimensional (2D) phases can demonstrate superior hardness, fracture toughness, and flexural strength. Cubic boron nitride-hexagonal boron nitride-silicon carbide whiskers (cBN-hBN-SiCw) nanocomposites with the simultaneous containing 1D SiCw and 2D hBN phases were successfully fabricated via the high-pressure sintering of a mixture of SiCw and cBN nanopowders. The hBN was generated in situ via the limited phase transition from cBN to hBN. Nanocomposites with 25 wt.% SiCw exhibited optimal comprehensive mechanical properties with Vickers hardness of 36.5 GPa, fracture toughness of 6.2 MPa·m1/2, and flexural strength of 687.4 MPa. Higher SiCw contents did not significantly affect the flexural strength but clearly decreased the hardness and toughness. The main toughening mechanism is believed to be a combination of hBN inter-layer sliding, SiCw pull-out, crack deflection, and crack bridging.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of cBN-hBN-SiCw Nanocomposite with Superior Hardness, Strength, and Toughness

Sun

Zou

et al. 2022

Nanomaterials

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“…Goto et al prepared 26 vol% TiN–61 vol% TiB 2 –13 vol% hBN composite ceramics by commercial TiN, TiB 2 , and hBN powders at 1700 °C and 100 MPa. The relative density, Vickers hardness, and fracture toughness of the sample reached 96%, 20.1 GPa, and 4.3 MPa·m 1/2 , respectively [ 17 ]. However, the bending strength was not reported.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the oxide impurities on the surface of the powder particles can promote grain coarsening, which further hinders densification [ 15 ]. Kitiwan et al showed that the sintering temperature of TiN–TiB 2 multiphase ceramics was lower than that of TiN and TiB 2 single-phase ceramics [ 16 , 17 ]. In addition, studies have shown that, in hard refractory carbides, nitrides, and borides, the presence of hexagonal boron nitride or graphite with layered structures can significantly enhance the machining property and thermal stability [ 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

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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“…According to literature: Target: T i (T i =T h for samples p 2 -p 8 and T i = T s for samples p 1 , p 9 -p 11 ) [11,[14][15][16][17][18][19][20][21][22][23].…”

Section: Methodsmentioning

confidence: 99%

A new approach to study of TiB2-TiN-SiC based tribological coatings with solid lubrication

et al. 2021

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An in-situ TiB 2 -TiN-SiC composite coating is deposited over steel substrate through laser treatment of a preplaced mixture of TiO 2 , SiO 2 , hBN and graphite powders. Coating's characteristics change significantly on individual additions of hBN and SiC to other constituents. This study focuses on checking the benefits of simultaneous addition of hBN and SiC on coating's properties using K-nearest neighbor (K-NN) methodology. Here, specific amounts of both hBN and SiC are added simultaneously in the precursor mixture (as found suitable through K-NN methodology) to study coating's characteristics in a situation where advantages of hBN as solid lubricant can be obtained without compromising the various mechanical properties. Characteristics of the coating developed with that composition of precursor mixture ensuring simultaneous addition of hBN and SiC is thoroughly studied through several microstructural, tribological and mechanical characterizations. On evaluation of tribological properties of the coating at varying loads, presence of both hBN and SiC shows interesting results. A coating with stoichiometric proportion of precursor mixture is also deposited and characterized for comparison.

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Spark plasma sintering of TiN–TiB2–hBN composites and their properties

Cited by 24 publications

References 22 publications

Synthesis of cBN-hBN-SiCw Nanocomposite with Superior Hardness, Strength, and Toughness

Synthesis of cBN-hBN-SiCw Nanocomposite with Superior Hardness, Strength, and Toughness

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

A new approach to study of TiB2-TiN-SiC based tribological coatings with solid lubrication

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