Novel HfB2-SiC-MoSi2 composites by reactive spark plasma sintering

Ghadami, S.; Taheri-Nassaj, E.; Baharvandi, Hamid Reza

doi:10.1016/j.jallcom.2019.151705

Cited by 27 publications

(11 citation statements)

References 47 publications

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“…Black regions are SiC, white regions are HfC, and the light regions are HfB 2 according to EDS analysis. This result is in excellent agreement with the previous study of the fabrication of in situ HfB 2 -based composites 21 . Figure 2 shows the final composition of the composite after the sintering process.…”

Section: Resultssupporting

confidence: 93%

“…In previous studies, the effective role of reinforcement morphology was demonstrated 21,50 . The SiC particles were elongated and homogeneously distributed in the HfB 2 skeleton.…”

Section: Mechanical Propertiesmentioning

confidence: 96%

“…It has been reported that the oxide impurities (HfO 2 , B 2 O 3 ) of HfB 2 starting powder can prevent the densification of HfB 2 ceramic 21 . Therefore, removing the oxide impurities and reaching full dense HfB 2 -based composites has been a challenging issue for researchers.…”

Section: Effect Of In Situ Vsi 2 and Sic Phases On The Sintering Behamentioning

confidence: 99%

“…The mass of the WC impurity from milling media was measured which indicated that ~ 5 wt%WC was incorporated into the mixed powders. It has been reported that the located HfO 2 on the surface of HfB 2 powders plays a barrier role against densification 21 . WC impurity from milling media could react with HfO 2 from starting powder; hence, it could remove the oxide-impurity and finally enhance the sintering process.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…This result is supported by other researchers 56,57 . It has been reported that carbon could be penetrated from graphite mold to the structure of HfB 2 -based composite during the sintering process 21,58 . Penetrated carbon could react with HfO 2 impurities at the temperature of 1700 °C according to the following reaction:…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Effect of in situ VSi2 and SiC phases on the sintering behavior and the mechanical properties of HfB2-based composites

Ghadami

Taheri-Nassaj

Baharvandi

et al. 2020

Sci Rep

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In situ HfB2–SiC–VSi2 composite was fabricated by reactive pressureless sintering at the temperature of 2150 °C for 4 h under a vacuum atmosphere. In situ SiC and VSi2 reinforcements were formed using VC and Si powders as starting materials according to the following reaction: VC + 3Si = SiC + VSi2. Microstructural studies and thermodynamic calculations revealed that in situ VSi2 and SiC phases were mostly formed and homogeneously distributed in HfB2 skeleton. The results showed that the density of in situ HfB2–SiC–VSi2 composite was 98%. Besides, the mechanical properties of the composite were effectively enhanced by the formation of in situ second phases. The Vickers hardness and the fracture toughness of the composite reached 20.1 GPa and 5.8 MPa m−1/2, respectively.

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Section: Resultssupporting

confidence: 93%

“…In previous studies, the effective role of reinforcement morphology was demonstrated 21,50 . The SiC particles were elongated and homogeneously distributed in the HfB 2 skeleton.…”

Section: Mechanical Propertiesmentioning

confidence: 96%

Section: Effect Of In Situ Vsi 2 and Sic Phases On The Sintering Behamentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%