Role of hot-pressing temperature on densification and microstructure of ZrB2–SiC ultrahigh temperature ceramics

Nguyen, Van‐Huy; Delbari, Seyed Ali; Asl, Mehdi Shahedi; Namini, Abbas Sabahi; Kakroudi, Mahdi Ghassemi; Azizian‐Kalandaragh, Yashar; Le, Quyet Van; Mohammadi, Mohsen; Shokouhimehr, Mohammadreza

doi:10.1016/j.ijrmhm.2020.105355

Cited by 29 publications

(4 citation statements)

References 71 publications

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“…Regarding secondary phases, the influence of different metallic binders and additives on the qualities of ZrB 2 composites has been investigated 24 . Nguyen and colleagues evaluated the effect of sintering temperature on the consolidation behavior of ZrB 2 -SiC ceramics 25 . They incorporated 30 vol% SiC to ZrB 2 matrix; sintering the samples under 10 MPa for 60 min at three different sintering temperatures (2050, 1850, and 1650 °C) using a hot-pressing technique.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and nanoindentation study of TaN incorporated ZrB2 and ZrB2–SiC ceramics

Delbari

Namini

Lee

et al. 2022

Sci Rep

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This study assessed the sinterability and microstructure of ZrB2-SiC-TaN and ZrB2-TaN ceramics. Spark plasma sintering at 2000 °C and 30 MPa for 5 min produced both ceramics. The relative density of ZrB2 ceramic containing TaN was 95.3%; the addition of SiC increased this value to 98.1%. SiC’s contribution to the elimination of ZrB2 surface oxides was the primary factor in the advancement of densification. The in situ formation of hexagonal boron nitride at the interface of TaN and ZrB2 was confirmed by high-resolution transmission electron microscopy, field emission-electron probe microanalyzer, X-ray diffractometry, and field emission scanning electron microscopy. Moreover, the in situ graphite might be produced as a byproduct of the SiC-SiO2 process, hence boosting the reduction of oxide compounds in the ternary system. The SiC compound had the highest hardness (29 ± 3 GPa), while the ZrB2/TaN interface exhibited the greatest values of elastic modulus (473 ± 26 GPa) and stiffness (0.76 ± 0.13 mN/nm).

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Section: Introductionmentioning

confidence: 99%

Microstructural and nanoindentation study of TaN incorporated ZrB2 and ZrB2–SiC ceramics

Delbari

Namini

Lee

et al. 2022

Sci Rep

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“…[4][5][6][7][8][9][10][11] For example, hot-pressing has been used in the development of composites with significantly higher thermal conductivities and in the densification of ultrahigh temperature ceramics. [12][13][14][15] Guillon 16 carefully studied the effect of applied stress on field-assisted sintering. Stress-assisted grain growth has also been a topic of interest.…”

Section: Introductionmentioning

confidence: 99%

“…Hot‐pressing and sinter‐forging have been reported on a variety of structural and electronic ceramics 4 – 11 . For example, hot‐pressing has been used in the development of composites with significantly higher thermal conductivities and in the densification of ultrahigh temperature ceramics 12–15 . Guillon 16 carefully studied the effect of applied stress on field‐assisted sintering.…”

Section: Introductionmentioning

confidence: 99%

The effectiveness of published continuum constitutive laws to predict stress‐assisted densification of powder compacts

et al. 2022

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Commonly used constitutive laws for crystalline and viscous materials have been compared to predict the densification behavior under hot-pressing and sinterforging. Experimental results, from literature for one loading condition, have been used to extract the constitutive laws for amorphous and crystalline materials and, these in-turn, have been used to predict behavior under a different set of loading conditions. Ideally, the constitutive parameters obtained from one set of loading conditions and thermal history should apply to a different set of conditions. However, there is a lack of systematic experimental studies in which this can be checked. In this paper, we use constitutive parameters obtained from one set of conditions to predict the densification response under a different set of loading conditions. For both sintering of amorphous and crystalline materi-

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“…The densification behavior and microstructure of ZrB 2 −SiC materials under various hot-pressing temperatures were assessed by Nguyen et al [35]. Though the composite HPed at 1650 °C contained almost 8% remaining porosity, one sintered at 2050 °C reached its near full density, indicating the magnificent role of sintering temperature in improving the sinterability of the ZrB 2 −SiC system.…”

Section: Introductionmentioning

confidence: 99%

Beneficial effect of low BN additive on densification and mechanical properties of hot-pressed ZrB2–SiC composites

Shafagh

Jafargholinejad

Javadian³

2021

Synth. Sinter.

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The incorporation of 1 wt% hexagonal BN (hBN) into ZrB2–30 vol% SiC could noticeably better the fracture toughness, hardness, and consolidation behavior of this composite. This research intended to scrutinize the effects of various amounts of hBN (0–5 wt%) on different characteristics of ZrB2–SiC materials. The hot-pressing method under 10 MPa at 1900 °C for 120 min was employed to sinter all designed specimens. Afterward, the as-sintered samples were characterized using X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), and Vickers technique. The hBN addition up to 1 wt% improved relative density, leading to a near fully dense sample; however, the incorporation of 5 wt% of such an additive led to a composite containing more than 5% remaining porosity. The highest Vickers hardness of 23.8 GPa and fracture toughness of 5.7 MPa.m1/2 were secured for the sample introduced by only 1 wt% hBN. Ultimately, breaking large SiC grains, crack bridging, crack deflection, crack branching, and crack arresting were introduced as the chief toughening mechanisms in the ZrB2–SiC–hBN system.

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Role of hot-pressing temperature on densification and microstructure of ZrB2–SiC ultrahigh temperature ceramics

Cited by 29 publications

References 71 publications

Microstructural and nanoindentation study of TaN incorporated ZrB2 and ZrB2–SiC ceramics

Microstructural and nanoindentation study of TaN incorporated ZrB2 and ZrB2–SiC ceramics

The effectiveness of published continuum constitutive laws to predict stress‐assisted densification of powder compacts

Beneficial effect of low BN additive on densification and mechanical properties of hot-pressed ZrB2–SiC composites

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