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

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6 Atıf (Scopus)

Özet

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.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)20114-20126
Sayfa sayısı13
DergiJournal of Physical Chemistry C
Hacim126
Basın numarası47
DOI'lar
Yayın durumuYayınlandı - 1 Ara 2022

Bibliyografik not

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

Finansman

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.

FinansörlerFinansör numarası
National High Performance Computing of Turkey
Ulusal Yüksek Başarımlı Hesaplama Merkezi, Istanbul Teknik Üniversitesi1008852020
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu213M163
Istanbul Teknik Üniversitesi370463

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