Microstructural investigation of spark plasma sintered TiB2 ceramics with Si3N4 addition

Zahra Hamidzadeh Mahaseni; Mohammad Dashti Germi; Zohre Ahmadi; Mehdi Shahedi Asl

doi:10.1016/j.ceramint.2018.04.171

Microstructural investigation of spark plasma sintered TiB₂ ceramics with Si₃N₄ addition

Zahra Hamidzadeh Mahaseni, Mohammad Dashti Germi, Zohre Ahmadi, Mehdi Shahedi Asl^*

^*Corresponding author for this work

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

95 Citations (Scopus)

Abstract

Monolithic TiB₂ and TiB₂–5 wt% Si₃N₄ ultrahigh temperature ceramics were fabricated by spark plasma sintering (SPS) at 1900 °C for 7 min under 40 MPa. The addition of Si₃N₄ as a sintering aid had a remarkable impact on the microstructure development of TiB₂-based ceramic. X-ray diffraction (XRD) analysis and microstructural investigations verified the formation of BN nano-platelets, TiN and SiO₂ in the Si₃N₄-doped TiB₂ sample via chemical reactions of Si₃N₄ with the oxide impurities (TiO₂ and B₂O₃) present on the surface of TiB₂ particles. The removal of surface oxide layers significantly prevented the extreme grain growth of TiB₂ matrix, which resulted in improved sinterability and relatively finer microstructure. Moreover, the formation of SiO₂ promoted the densification through the liquid phase sintering mechanism.

Original language	English
Pages (from-to)	13367-13372
Number of pages	6
Journal	Ceramics International
Volume	44
Issue number	11
DOIs	https://doi.org/10.1016/j.ceramint.2018.04.171
Publication status	Published - 1 Aug 2018
Externally published	Yes

Keywords

BN nano-platelet
Densification
Microstructure
SiN
Spark plasma sintering
TiB

Access to Document

10.1016/j.ceramint.2018.04.171

Cite this

@article{983e2c68986d42eda852d48f6912d862,

title = "Microstructural investigation of spark plasma sintered TiB2 ceramics with Si3N4 addition",

abstract = "Monolithic TiB2 and TiB2–5 wt% Si3N4 ultrahigh temperature ceramics were fabricated by spark plasma sintering (SPS) at 1900 °C for 7 min under 40 MPa. The addition of Si3N4 as a sintering aid had a remarkable impact on the microstructure development of TiB2-based ceramic. X-ray diffraction (XRD) analysis and microstructural investigations verified the formation of BN nano-platelets, TiN and SiO2 in the Si3N4-doped TiB2 sample via chemical reactions of Si3N4 with the oxide impurities (TiO2 and B2O3) present on the surface of TiB2 particles. The removal of surface oxide layers significantly prevented the extreme grain growth of TiB2 matrix, which resulted in improved sinterability and relatively finer microstructure. Moreover, the formation of SiO2 promoted the densification through the liquid phase sintering mechanism.",

keywords = "BN nano-platelet, Densification, Microstructure, SiN, Spark plasma sintering, TiB",

author = "{Hamidzadeh Mahaseni}, Zahra and {Dashti Germi}, Mohammad and Zohre Ahmadi and {Shahedi Asl}, Mehdi",

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

year = "2018",

month = aug,

day = "1",

doi = "10.1016/j.ceramint.2018.04.171",

language = "English",

volume = "44",

pages = "13367--13372",

journal = "Ceramics International",

issn = "0272-8842",

number = "11",

}

TY - JOUR

T1 - Microstructural investigation of spark plasma sintered TiB2 ceramics with Si3N4 addition

AU - Hamidzadeh Mahaseni, Zahra

AU - Dashti Germi, Mohammad

AU - Ahmadi, Zohre

AU - Shahedi Asl, Mehdi

PY - 2018/8/1

Y1 - 2018/8/1

N2 - Monolithic TiB2 and TiB2–5 wt% Si3N4 ultrahigh temperature ceramics were fabricated by spark plasma sintering (SPS) at 1900 °C for 7 min under 40 MPa. The addition of Si3N4 as a sintering aid had a remarkable impact on the microstructure development of TiB2-based ceramic. X-ray diffraction (XRD) analysis and microstructural investigations verified the formation of BN nano-platelets, TiN and SiO2 in the Si3N4-doped TiB2 sample via chemical reactions of Si3N4 with the oxide impurities (TiO2 and B2O3) present on the surface of TiB2 particles. The removal of surface oxide layers significantly prevented the extreme grain growth of TiB2 matrix, which resulted in improved sinterability and relatively finer microstructure. Moreover, the formation of SiO2 promoted the densification through the liquid phase sintering mechanism.

AB - Monolithic TiB2 and TiB2–5 wt% Si3N4 ultrahigh temperature ceramics were fabricated by spark plasma sintering (SPS) at 1900 °C for 7 min under 40 MPa. The addition of Si3N4 as a sintering aid had a remarkable impact on the microstructure development of TiB2-based ceramic. X-ray diffraction (XRD) analysis and microstructural investigations verified the formation of BN nano-platelets, TiN and SiO2 in the Si3N4-doped TiB2 sample via chemical reactions of Si3N4 with the oxide impurities (TiO2 and B2O3) present on the surface of TiB2 particles. The removal of surface oxide layers significantly prevented the extreme grain growth of TiB2 matrix, which resulted in improved sinterability and relatively finer microstructure. Moreover, the formation of SiO2 promoted the densification through the liquid phase sintering mechanism.

KW - BN nano-platelet

KW - Densification

KW - Microstructure

KW - SiN

KW - Spark plasma sintering

KW - TiB

UR - http://www.scopus.com/inward/record.url?scp=85046154016&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2018.04.171

DO - 10.1016/j.ceramint.2018.04.171

M3 - Article

AN - SCOPUS:85046154016

SN - 0272-8842

VL - 44

SP - 13367

EP - 13372

JO - Ceramics International

JF - Ceramics International

IS - 11

ER -

Microstructural investigation of spark plasma sintered TiB₂ ceramics with Si₃N₄ addition

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this