Influence of TiN dopant on microstructure of TiB2 ceramic sintered by spark plasma

Farzad Shayesteh; Seyed Ali Delbari; Zohre Ahmadi; Mohammadreza Shokouhimehr; Mehdi Shahedi Asl

doi:10.1016/j.ceramint.2018.11.228

Influence of TiN dopant on microstructure of TiB₂ ceramic sintered by spark plasma

Farzad Shayesteh, Seyed Ali Delbari, Zohre Ahmadi, Mohammadreza Shokouhimehr, Mehdi Shahedi Asl^*

^*Corresponding author for this work

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

110 Citations (Scopus)

Abstract

In this study, the impact of TiN as a sintering aid on the relative density and microstructure of TiB₂ ceramic was investigated. Monolithic TiB₂ and TiB₂ doped with 5 wt% TiN were sintered at 1900 °C for 7 min dwell time under the pressure of 40 MPa by spark plasma. The addition of TiN affected the microstructure of TiB₂-based sample considerably depicting the finer grains in the as-sintered ceramic. X-ray diffraction evaluation indicated that no interaction occurred between the initial materials. However, detail investigation by the map analysis and energy dispersive spectroscopy results revealed the formation of in-situ nano-sized hBN secondary phase in the TiN-doped TiB₂. In addition, TiN played a remarkable role on increasing the relative density of TiN-doped TiB₂ ceramic producing a nearly fully dense ceramic with relative density of 99.9% in comparison with the monolithic ceramic having 96.7% relative density.

Original language	English
Pages (from-to)	5306-5311
Number of pages	6
Journal	Ceramics International
Volume	45
Issue number	5
DOIs	https://doi.org/10.1016/j.ceramint.2018.11.228
Publication status	Published - 1 Apr 2019
Externally published	Yes

Keywords

Densification
hBN nano-platelets
Microstructure
Spark plasma sintering
TiB
TiN

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10.1016/j.ceramint.2018.11.228

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title = "Influence of TiN dopant on microstructure of TiB2 ceramic sintered by spark plasma",

abstract = "In this study, the impact of TiN as a sintering aid on the relative density and microstructure of TiB2 ceramic was investigated. Monolithic TiB2 and TiB2 doped with 5 wt% TiN were sintered at 1900 °C for 7 min dwell time under the pressure of 40 MPa by spark plasma. The addition of TiN affected the microstructure of TiB2-based sample considerably depicting the finer grains in the as-sintered ceramic. X-ray diffraction evaluation indicated that no interaction occurred between the initial materials. However, detail investigation by the map analysis and energy dispersive spectroscopy results revealed the formation of in-situ nano-sized hBN secondary phase in the TiN-doped TiB2. In addition, TiN played a remarkable role on increasing the relative density of TiN-doped TiB2 ceramic producing a nearly fully dense ceramic with relative density of 99.9% in comparison with the monolithic ceramic having 96.7% relative density.",

keywords = "Densification, hBN nano-platelets, Microstructure, Spark plasma sintering, TiB, TiN",

author = "Farzad Shayesteh and Delbari, {Seyed Ali} and Zohre Ahmadi and Mohammadreza Shokouhimehr and {Shahedi Asl}, Mehdi",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd and Techna Group S.r.l.",

year = "2019",

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doi = "10.1016/j.ceramint.2018.11.228",

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T1 - Influence of TiN dopant on microstructure of TiB2 ceramic sintered by spark plasma

AU - Shayesteh, Farzad

AU - Delbari, Seyed Ali

AU - Ahmadi, Zohre

AU - Shokouhimehr, Mohammadreza

AU - Shahedi Asl, Mehdi

PY - 2019/4/1

Y1 - 2019/4/1

N2 - In this study, the impact of TiN as a sintering aid on the relative density and microstructure of TiB2 ceramic was investigated. Monolithic TiB2 and TiB2 doped with 5 wt% TiN were sintered at 1900 °C for 7 min dwell time under the pressure of 40 MPa by spark plasma. The addition of TiN affected the microstructure of TiB2-based sample considerably depicting the finer grains in the as-sintered ceramic. X-ray diffraction evaluation indicated that no interaction occurred between the initial materials. However, detail investigation by the map analysis and energy dispersive spectroscopy results revealed the formation of in-situ nano-sized hBN secondary phase in the TiN-doped TiB2. In addition, TiN played a remarkable role on increasing the relative density of TiN-doped TiB2 ceramic producing a nearly fully dense ceramic with relative density of 99.9% in comparison with the monolithic ceramic having 96.7% relative density.

AB - In this study, the impact of TiN as a sintering aid on the relative density and microstructure of TiB2 ceramic was investigated. Monolithic TiB2 and TiB2 doped with 5 wt% TiN were sintered at 1900 °C for 7 min dwell time under the pressure of 40 MPa by spark plasma. The addition of TiN affected the microstructure of TiB2-based sample considerably depicting the finer grains in the as-sintered ceramic. X-ray diffraction evaluation indicated that no interaction occurred between the initial materials. However, detail investigation by the map analysis and energy dispersive spectroscopy results revealed the formation of in-situ nano-sized hBN secondary phase in the TiN-doped TiB2. In addition, TiN played a remarkable role on increasing the relative density of TiN-doped TiB2 ceramic producing a nearly fully dense ceramic with relative density of 99.9% in comparison with the monolithic ceramic having 96.7% relative density.

KW - Densification

KW - hBN nano-platelets

KW - Microstructure

KW - Spark plasma sintering

KW - TiB

KW - TiN

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DO - 10.1016/j.ceramint.2018.11.228

M3 - Article

AN - SCOPUS:85057813064

SN - 0272-8842

VL - 45

SP - 5306

EP - 5311

JO - Ceramics International

JF - Ceramics International

IS - 5

ER -

Influence of TiN dopant on microstructure of TiB₂ ceramic sintered by spark plasma

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Keywords

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