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

Filiz Çlnar Şahin; Mubashir Mansoor; Meral Cengiz; Burcu Apak; Leyla Yanmaz; Katalin Balazsi; Zsolt Fogarassy; Bora Derin; Gültekin Göller; Onuralp Yücel

doi:10.1021/acs.jpcc.2c06179

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

Filiz Çlnar Şahin^*, Mubashir Mansoor, Meral Cengiz, Burcu Apak, Leyla Yanmaz, Katalin Balazsi, Zsolt Fogarassy, Bora Derin, Gültekin Göller, Onuralp Yücel

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

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 B₄C matrix in order to initiate an in situ self-propagating high-temperature synthesis (SHS) of TiB₂. The SHS reaction not only enhances many of the physical and mechanical properties of B₄C, but also reduces the required sintering temperature and pressure because of the enthalpy of reaction between metallic Ti and B₄C. 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 TiB₂, resulting in a core-shell microstructure with a carbon core, surrounded by a TiB₂shell in the B₄C matrix. Moreover, by carrying out a control experiment where TiB₂was added instead of Ti, and performing a molecular dynamics simulation of the B₄C-Ti interface, the significance of the in situ SHS process has been validated.

Original language	English
Pages (from-to)	20114-20126
Number of pages	13
Journal	Journal of Physical Chemistry C
Volume	126
Issue number	47
DOIs	https://doi.org/10.1021/acs.jpcc.2c06179
Publication status	Published - 1 Dec 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Funding

We appreciate the tremendous assistance of Hüseyin Sezer during the characterization stages. This study was partially supported by TUBITAK in the context of project number 213M163 and Scientific Research Project Funds of Istanbul Technical University under project number 370463. The supercomputer resources for this study have been provided by the National High Performance Computing of Turkey (UHeM) under grant number 1008852020, supported by Associate Professor Zuhal Er, for which we are grateful. We are also thankful for the fruitful communications with Assistant Professor Garip Erdoğan and Şerzat Safaltın.

Funders	Funder number
National High Performance Computing of Turkey
Ulusal Yüksek Başarımlı Hesaplama Merkezi, Istanbul Teknik Üniversitesi	1008852020
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu	213M163
Istanbul Teknik Üniversitesi	370463

Access to Document

10.1021/acs.jpcc.2c06179

Cite this

Çlnar Şahin, F., Mansoor, M., Cengiz, M., Apak, B., Yanmaz, L., Balazsi, K., Fogarassy, Z., Derin, B., Göller, G., & Yücel, O. (2022). B₄C Composites with a TiB₂-C Core-Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering. Journal of Physical Chemistry C, 126(47), 20114-20126. https://doi.org/10.1021/acs.jpcc.2c06179

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abstract = "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 B4C matrix in order to initiate an in situ self-propagating high-temperature synthesis (SHS) of TiB2. The SHS reaction not only enhances many of the physical and mechanical properties of B4C, but also reduces the required sintering temperature and pressure because of the enthalpy of reaction between metallic Ti and B4C. 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 TiB2, resulting in a core-shell microstructure with a carbon core, surrounded by a TiB2shell in the B4C matrix. Moreover, by carrying out a control experiment where TiB2was added instead of Ti, and performing a molecular dynamics simulation of the B4C-Ti interface, the significance of the in situ SHS process has been validated.",

author = "{{\c C}lnar {\c S}ahin}, Filiz and Mubashir Mansoor and Meral Cengiz and Burcu Apak and Leyla Yanmaz and Katalin Balazsi and Zsolt Fogarassy and Bora Derin and G{\"u}ltekin G{\"o}ller and Onuralp Y{\"u}cel",

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Çlnar Şahin, F, Mansoor, M, Cengiz, M, Apak, B, Yanmaz, L, Balazsi, K, Fogarassy, Z, Derin, B , Göller, G & Yücel, O 2022, 'B₄C Composites with a TiB₂-C Core-Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering', Journal of Physical Chemistry C, vol. 126, no. 47, pp. 20114-20126. https://doi.org/10.1021/acs.jpcc.2c06179

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T1 - B4C Composites with a TiB2-C Core-Shell Microstructure Produced by Self-Propagating High-Temperature Synthesis-Assisted Spark Plasma Sintering

AU - Çlnar Şahin, Filiz

AU - Mansoor, Mubashir

AU - Cengiz, Meral

AU - Apak, Burcu

AU - Yanmaz, Leyla

AU - Balazsi, Katalin

AU - Fogarassy, Zsolt

AU - Derin, Bora

AU - Göller, Gültekin

AU - Yücel, Onuralp

PY - 2022/12/1

Y1 - 2022/12/1

N2 - 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 B4C matrix in order to initiate an in situ self-propagating high-temperature synthesis (SHS) of TiB2. The SHS reaction not only enhances many of the physical and mechanical properties of B4C, but also reduces the required sintering temperature and pressure because of the enthalpy of reaction between metallic Ti and B4C. 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 TiB2, resulting in a core-shell microstructure with a carbon core, surrounded by a TiB2shell in the B4C matrix. Moreover, by carrying out a control experiment where TiB2was added instead of Ti, and performing a molecular dynamics simulation of the B4C-Ti interface, the significance of the in situ SHS process has been validated.

AB - 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 B4C matrix in order to initiate an in situ self-propagating high-temperature synthesis (SHS) of TiB2. The SHS reaction not only enhances many of the physical and mechanical properties of B4C, but also reduces the required sintering temperature and pressure because of the enthalpy of reaction between metallic Ti and B4C. 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 TiB2, resulting in a core-shell microstructure with a carbon core, surrounded by a TiB2shell in the B4C matrix. Moreover, by carrying out a control experiment where TiB2was added instead of Ti, and performing a molecular dynamics simulation of the B4C-Ti interface, the significance of the in situ SHS process has been validated.

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