Effects of discrete and simultaneous addition of SiC and Si3N4 on microstructural development of TiB2 ceramics

Van Huy Nguyen; Seyed Ali Delbari; Zohre Ahmadi; Abbas Sabahi Namini; Quyet Van Le; Mohammadreza Shokouhimehr; Mehdi Shahedi Asl; Mohsen Mohammadi

doi:10.1016/j.ceramint.2020.09.196

Effects of discrete and simultaneous addition of SiC and Si₃N₄ on microstructural development of TiB₂ ceramics

Van Huy Nguyen^*, Seyed Ali Delbari, Zohre Ahmadi, Abbas Sabahi Namini^*, Quyet Van Le^*, Mohammadreza Shokouhimehr, Mehdi Shahedi Asl^*, Mohsen Mohammadi

^*Corresponding author for this work

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

13 Citations (Scopus)

Abstract

The impact of Si₃N₄ and SiC additives incorporation in the microstructure and sintering behavior of TiB₂-based composites were studied. Three ceramic composites including TiB₂–Si₃N₄, TiB₂–SiC, and TiB₂–SiC–Si₃N₄ were manufactured by spark plasma sintering (SPS) at 1950 °C for 8 min under 35 MPa. The acquired ceramics were analyzed by X-ray diffractometry and scanning electron microscopy. In addition, the sintering thermodynamic was investigated using the HSC Chemistry package. X-ray diffraction patterns of the prepared ceramics revealed the in-situ formation of graphite and boron nitride in the final composites initiated from SiC and Si₃N₄, respectively. The thermodynamic assessments proved the role of liquid phase sintering on the sinterability enhancement of all composite samples. Field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy verified the in-situ formation of both BN and graphite components in the sample containing SiC and Si₃N₄ additives. Finally, the fractographical investigations clarified the transgranular breakage as the main fracture mode in the TiB₂-based ceramics.

Original language	English
Pages (from-to)	3520-3528
Number of pages	9
Journal	Ceramics International
Volume	47
Issue number	3
DOIs	https://doi.org/10.1016/j.ceramint.2020.09.196
Publication status	Published - 1 Feb 2021
Externally published	Yes

Keywords

Microstructure
SiN
SiC
Spark plasma sintering
TiB
UHTCs

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10.1016/j.ceramint.2020.09.196

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title = "Effects of discrete and simultaneous addition of SiC and Si3N4 on microstructural development of TiB2 ceramics",

abstract = "The impact of Si3N4 and SiC additives incorporation in the microstructure and sintering behavior of TiB2-based composites were studied. Three ceramic composites including TiB2–Si3N4, TiB2–SiC, and TiB2–SiC–Si3N4 were manufactured by spark plasma sintering (SPS) at 1950 °C for 8 min under 35 MPa. The acquired ceramics were analyzed by X-ray diffractometry and scanning electron microscopy. In addition, the sintering thermodynamic was investigated using the HSC Chemistry package. X-ray diffraction patterns of the prepared ceramics revealed the in-situ formation of graphite and boron nitride in the final composites initiated from SiC and Si3N4, respectively. The thermodynamic assessments proved the role of liquid phase sintering on the sinterability enhancement of all composite samples. Field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy verified the in-situ formation of both BN and graphite components in the sample containing SiC and Si3N4 additives. Finally, the fractographical investigations clarified the transgranular breakage as the main fracture mode in the TiB2-based ceramics.",

keywords = "Microstructure, SiN, SiC, Spark plasma sintering, TiB, UHTCs",

author = "Nguyen, {Van Huy} and Delbari, {Seyed Ali} and Zohre Ahmadi and {Sabahi Namini}, Abbas and Le, {Quyet Van} and Mohammadreza Shokouhimehr and {Shahedi Asl}, Mehdi and Mohsen Mohammadi",

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doi = "10.1016/j.ceramint.2020.09.196",

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AU - Nguyen, Van Huy

AU - Delbari, Seyed Ali

AU - Ahmadi, Zohre

AU - Sabahi Namini, Abbas

AU - Le, Quyet Van

AU - Shokouhimehr, Mohammadreza

AU - Shahedi Asl, Mehdi

AU - Mohammadi, Mohsen

PY - 2021/2/1

Y1 - 2021/2/1

N2 - The impact of Si3N4 and SiC additives incorporation in the microstructure and sintering behavior of TiB2-based composites were studied. Three ceramic composites including TiB2–Si3N4, TiB2–SiC, and TiB2–SiC–Si3N4 were manufactured by spark plasma sintering (SPS) at 1950 °C for 8 min under 35 MPa. The acquired ceramics were analyzed by X-ray diffractometry and scanning electron microscopy. In addition, the sintering thermodynamic was investigated using the HSC Chemistry package. X-ray diffraction patterns of the prepared ceramics revealed the in-situ formation of graphite and boron nitride in the final composites initiated from SiC and Si3N4, respectively. The thermodynamic assessments proved the role of liquid phase sintering on the sinterability enhancement of all composite samples. Field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy verified the in-situ formation of both BN and graphite components in the sample containing SiC and Si3N4 additives. Finally, the fractographical investigations clarified the transgranular breakage as the main fracture mode in the TiB2-based ceramics.

AB - The impact of Si3N4 and SiC additives incorporation in the microstructure and sintering behavior of TiB2-based composites were studied. Three ceramic composites including TiB2–Si3N4, TiB2–SiC, and TiB2–SiC–Si3N4 were manufactured by spark plasma sintering (SPS) at 1950 °C for 8 min under 35 MPa. The acquired ceramics were analyzed by X-ray diffractometry and scanning electron microscopy. In addition, the sintering thermodynamic was investigated using the HSC Chemistry package. X-ray diffraction patterns of the prepared ceramics revealed the in-situ formation of graphite and boron nitride in the final composites initiated from SiC and Si3N4, respectively. The thermodynamic assessments proved the role of liquid phase sintering on the sinterability enhancement of all composite samples. Field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy verified the in-situ formation of both BN and graphite components in the sample containing SiC and Si3N4 additives. Finally, the fractographical investigations clarified the transgranular breakage as the main fracture mode in the TiB2-based ceramics.

KW - Microstructure

KW - SiN

KW - SiC

KW - Spark plasma sintering

KW - TiB

KW - UHTCs

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Effects of discrete and simultaneous addition of SiC and Si₃N₄ on microstructural development of TiB₂ ceramics

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