Pressureless Sintering and Properties of Boron Carbide-Titanium Diboride Composites by &lt;i&gt;In Situ&lt;/i&gt; Reaction

Liu, Ai Dong; Qiao, Ying Jie; Liu, Yijie

doi:10.4028/www.scientific.net/kem.525-526.321

Cited by 3 publications

(3 citation statements)

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“…An alternative approach is using nanoparticles to enhance the sinterability as a result of larger surface area of powder compact and enhanced mechanical properties of the material because of smaller grain sizes. Nevertheless, the issue of fracture toughness is most efficiently resolved by addition of appropriate second phases. − …”

Section: Introductionmentioning

confidence: 99%

“…B4C-TiB2 composites have been produced by various different sintering techniques such as traditional pressureless sintering, − hot pressing, − hot isostatic pressing, and spark plasma sintering (SPS). − Although each method has had its own advantages, SPS is a relatively new method that has proven to be exceptionally promising for sintering of B 4 C composites when compared to traditional sintering methods. Among the advantages of SPS are its fast sintering time of only a few minutes and comparatively lower sintering temperatures that lead to lower energy consumption and its capacity for preventing grain coarsening which are of significant importance.…”

Section: Introductionmentioning

confidence: 99%

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B₄C Composites with a TiB₂-C Core–Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering

et al. 2022

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Square-shaped boron carbide ceramic composites have been produced by spark plasma sintering with the addition of 5 to 20 vol % titanium metal powder in the B 4 C matrix in order to initiate an in situ self-propagating high-temperature synthesis (SHS) of TiB 2 . The SHS reaction not only enhances many of the physical and mechanical properties of B 4 C, but also reduces the required sintering temperature and pressure because of the enthalpy of reaction between metallic Ti and B 4 C. Sintering has been carried out in the SPS-temperature range of 1450 to 1550 °C with a uniaxial pressure of 40 MPa and a dwell time of 4 min under a 1 atm argon atmosphere. The effects of various amounts of Ti additions and sintering temperature on the phase composition, density, hardness, fracture toughness, and microstructure are examined. X-ray diffraction and transmission electron microscopy evaluations have shown that added Ti completely transforms into TiB 2 , resulting in a core−shell microstructure with a carbon core, surrounded by a TiB 2 shell in the B 4 C matrix. Moreover, by carrying out a control experiment where TiB 2 was added instead of Ti, and performing a molecular dynamics simulation of the B 4 C-Ti interface, the significance of the in situ SHS process has been validated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

B₄C Composites with a TiB₂-C Core–Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering

et al. 2022

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“…Elastic modulus and Vickers hardness values for different samples as compared with the reported values[35][36][37].…”

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confidence: 99%

The Effects of Transition Metal Oxides (Me = Ti, Zr, Nb, and Ta) on the Mechanical Properties and Interfaces of B4C Ceramics Fabricated via Pressureless Sintering

et al. 2020

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There is little available research on how different transition metal oxides influence the behavior of B4C-based ceramics, especially for Ta2O5 and Nb2O5. B4C-MeB2 (Me = Ti, Zr, Nb, and Ta) multiphase ceramic samples were prepared via in situ pressureless sintering at 2250 °C, involving the mixing of B4C and MeOx powders, namely TiO2, ZrO2, Nb2O5, and Ta2O5. The phase constituents, microstructures, and mechanical properties of the samples were tested. The results indicated that different transition metal elements had different effects on the ceramic matrix, as verified through a comparative analysis. Additionally, the doped WC impurity during the ball milling process led to the production of (Me, W)B2 and W2B5, which brought about changes in morphology and performance. In this study, the Ta2O5-added sample exhibited the best performance, with elastic modulus, flexural strength, Vickers hardness, and fracture toughness values of 312.0 GPa, 16.3 GPa, 313.0 MPa, and 6.08 MPa·m1/2, respectively. The comprehensive mechanical properties were better than the reported values when the mass fraction of the second phase was around five percent.

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Phase composition, structure and properties of B<sub>4</sub>C–TiB<sub>2</sub> ceramics produced by hot pressing

Khabirov,

Cherkasova,

Gudyma

et al. 2024

Izv. VUZ. Poroshk. Met.

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Composite ceramic materials based on B4C with the addition of TiB2 in amounts of 0, 10, 20, 25 and 30 mol. % have been studied. Titanium diboride was synthesized from TiO2 powder and nanofibrous carbon using the boron carbide method in an induction furnace at 1650 °C in an argon atmosphere. The samples were produced by hot pressing at 2100 °C and 25 MPa in an argon environment. The phase composition was determined, and the apparent density and open porosity of the experimental materials were measured. The microstructure was assessed using optical and scanning electron microscopy. The investigations revealed that an increase in the TiB2 content reduces the open porosity while concurrently enhancing the relative density of the boron carbide ceramics. For a sample containing 30 mol. % TiB2 , the open porosity and relative theoretical density were 1.6 and 99 %, respectively. Using XRD and XRS analyses established that the synthesized materials are comprised of two phases: B4C and TiB2 . The average grain size of TiB2 was 0.85 ± 0.02 µm for the sample with 10 mol. % TiB2 and 8.90 ± 0.25 µm for the material with 30 mol. % TiB2 . It was found that at higher TiB2 concentrations, large clusters of grains are formed. The destruction pattern of B4C grains is intragranular, while TiB2 grains are characterized by intergranular destruction. For a sample containing 30 mol. % TiB2 , the fracture toughness was 4.97 ± 0.23 MPa∙m0.5, and the hardness was 3320 ± 120 HV0.5 . Therefore, the addition of TiB2 at these specified concentrations facilitated a 30 % enhancement in fracture toughness relative to single-phase B4C while preserving a high level of hardness.

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Pressureless Sintering and Properties of Boron Carbide-Titanium Diboride Composites by <i>In Situ</i> Reaction

Cited by 3 publications

References 14 publications

B₄C Composites with a TiB₂-C Core–Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering

B₄C Composites with a TiB₂-C Core–Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering

The Effects of Transition Metal Oxides (Me = Ti, Zr, Nb, and Ta) on the Mechanical Properties and Interfaces of B4C Ceramics Fabricated via Pressureless Sintering

Phase composition, structure and properties of B<sub>4</sub>C–TiB<sub>2</sub> ceramics produced by hot pressing

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Pressureless Sintering and Properties of Boron Carbide-Titanium Diboride Composites by <i>In Situ</i> Reaction

Cited by 3 publications

References 14 publications

B4C Composites with a TiB2-C Core–Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering

B4C Composites with a TiB2-C Core–Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering

The Effects of Transition Metal Oxides (Me = Ti, Zr, Nb, and Ta) on the Mechanical Properties and Interfaces of B4C Ceramics Fabricated via Pressureless Sintering

Phase composition, structure and properties of B<sub>4</sub>C–TiB<sub>2</sub> ceramics produced by hot pressing

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Product

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B₄C Composites with a TiB₂-C Core–Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering

B₄C Composites with a TiB₂-C Core–Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering