Oxidation-affected zone in the sintered ZrB2–SiC–HfB2 composites

Dodi, Ebrahim; Balak, Zohre; Kafashan, Hosein

doi:10.53063/synsint.2022.21111

Cited by 11 publications

(2 citation statements)

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“…Among the UHTCs, ZrB 2 -based ceramics are in priority and are the best candidates for applications like thermal protection systems (TPS) or refractory crucibles [6]. Despite favorable features of ZrB 2 -based materials, some deficiencies, such as low sinterability because of covalent strong bonds, relatively low fracture toughness, and poor oxidation resistance, restrict the ZrB 2 -based ceramics utilization in many industries [7]. The solution to improve the properties, as mentioned above, is the addition of a secondary phase.…”

Section: Introductionmentioning

confidence: 99%

A TEM study of nanostructures and interfaces in the hot-press sintered ZrB2–SiC–Si3N4 composites

Bazhin,

Nikolaev,

Esthefania Quiroz Cabascango

et al. 2023

Synth. Sinter.

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A fully dense ZrB2–30 vol% SiC composite containing 5 wt% Si3N4 and 4 wt% phenolic resin (1.6 wt% carbon) was sintered using the hot-pressing route under the external pressure of 10 MPa at 1900 ºC for 2 h. The microstructural evolution and interfacial phenomena were scrutinized using advanced microscopy facilities such as high-resolution transmission electron microscopy (HRTEM) and field emission scanning electron microscopy (FESEM). The FESEM images showed the ZrB2 and SiC grains without any evidence of Si3N4. The formation of the hexagonal BN (hBN) phase was proven in the sintered composite. The hBN nanosheets had a graphite-like morphology with an average thickness of 20 nm. This phase has a perpendicular orientation to the pressure direction and prevents abnormal ZrB2 grain growth. Two types of ZrB2/SiC interfaces were detected, which exhibited an amorphous phase along with the grain boundary and a clean/smooth interface, resulting from the Si3N4 addition. HRTEM and inverse fast Fourier transform (IFFT) observations disclosed that the d-spacing value in the ZrB2 grain (0.335 nm) is higher than those reported in the literature. Furthermore, it was found that the exerted pressure during the sintering distorted atomic planes. The presence of numerous dislocations within the ZrB2 grains confirmed dislocation creep as the main densification mechanism.

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Section: Introductionmentioning

confidence: 99%

A TEM study of nanostructures and interfaces in the hot-press sintered ZrB2–SiC–Si3N4 composites

Bazhin,

Nikolaev,

Esthefania Quiroz Cabascango

et al. 2023

Synth. Sinter.

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“…Therefore, the presence of SiC reinforcement in ZrB 2 -based ceramic composites reduces their oxidation rate. This is due to the formation of the B 2 O 3 -SiO 2 glass shell, which is more viscous and stable compared to a single B 2 O 3 and has a lower vapor pressure [32][33][34][35][36].…”

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confidence: 99%

Oxidation response of ZrB2–SiC–ZrC composites prepared by spark plasma sintering

Jarvand

Balak

2022

Synth. Sinter.

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Considering the importance and application of ultrahigh temperature ceramics in oxidizing environments, in this research, the effect of ZrC content and spark plasma sintering parameters (temperature, time and pressure) on the oxidation response of ZrB2–SiC composites has been investigated. After fabricating the ternary composite samples in different SPS conditions and with different amounts of ZrC, the post-sintering oxidation process was carried out in a box furnace at the temperature of 1400 °C. Increasing the time and temperature of the SPS process caused the decrease in the oxidation resistance of the samples. The reason for such observations was attributed to the extreme growth of grains with increasing the temperature and time of the sintering process despite the better densification of the samples. This research did not reach a clear result about the effect of SPS pressure on composites oxidation behavior. Increasing the amount of ZrC also did not have a positive effect on the oxidation resistance of the samples because this phase itself undergoes oxidation at low temperatures.

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The spark plasma sintering of the optimized parametric process for the magnesium alloy reinforced hybrid nano-ceramics

Fayomi

Popoola

et al. 2022

Int J Adv Manuf Technol

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Oxidation-affected zone in the sintered ZrB2–SiC–HfB2 composites

Cited by 11 publications

References 0 publications

A TEM study of nanostructures and interfaces in the hot-press sintered ZrB2–SiC–Si3N4 composites

A TEM study of nanostructures and interfaces in the hot-press sintered ZrB2–SiC–Si3N4 composites

Oxidation response of ZrB2–SiC–ZrC composites prepared by spark plasma sintering

The spark plasma sintering of the optimized parametric process for the magnesium alloy reinforced hybrid nano-ceramics

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