Sintering and recrystallization of ZrC-ZrB2 compacts

Gropyanov, V. M.; Bel'tyukova, L. M.

doi:10.1007/bf00774699

Cited by 13 publications

(3 citation statements)

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“…So, all important factors such as SiC, C f , MoSi 2 , HfB 2 and ZrC content, milling time of C f and SPS parameters such as temperature, time and pressure were chosen according to previous studious [2,[10][11][12][13][14][15][16][17][18]. Four levels were selected for each of them.…”

Section: Methodsmentioning

confidence: 99%

Effect of HfB2 on microstructure and mechanical properties of ZrB2–SiC-based composites

Balak

Zakeri

2016

International Journal of Refractory Metals and Hard Materials

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Section: Methodsmentioning

confidence: 99%

Effect of HfB2 on microstructure and mechanical properties of ZrB2–SiC-based composites

Balak

Zakeri

2016

International Journal of Refractory Metals and Hard Materials

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“…To the best of our knowledge, investigations of the ZrB 2 –ZrC system have been limited and few studies have reported the elevated temperature mechanical properties. Gropyanov and Bel'tyukova showed that the additions of ZrC to ZrB 2 improve sintering . In their study, additions of 10 vol% ZrC lowered the activation energy for sintering by ~25% and suppressed grain growth in the ZrB 2 and ZrC phase.…”

Section: Introductionmentioning

confidence: 95%

Ultra‐High Temperature Mechanical Properties of a Zirconium Diboride–Zirconium Carbide Ceramic

2015

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The mechanical properties of a ZrB2‐10 vol% ZrC ceramic were measured up to 2300°C in an argon atmosphere. Dense billets of ZrB2‐9.5 vol% ZrC‐0.1 vol% C were produced by hot‐pressing at 1900°C. The ZrB2 grain size was 4.9 μm and ZrC cluster size was 1.8 μm. Flexure strength was 695 MPa at ambient, decreasing to 300 MPa at 1600°C, increasing to 345 MPa at 1800°C and 2000°C, and then decreasing to 290 MPa at 2200°C and 2300°C. Fracture toughness was 4.8 MPa·m½ at room temperature, decreasing to 3.4 MPa·m½ at 1400°C, increasing to 4.5 MPa·m½ at 1800°C, and decreasing to 3.6 MPa·m½ at 2300°C. Elastic modulus calculated from the crosshead displacement was estimated to be 505 GPa at ambient, relatively unchanging to 1200°C, then decreasing linearly to 385 GPa at 1600°C, more slowly to 345 GPa at 2000°C, and then more rapidly to 260 GPa at 2300°C. Surface flaws resulting from machining damage were the critical flaw up to 1400°C. Above 1400°C, plasticity reduced the stress at the crack tip and the surface flaws experienced subcritical crack growth. Above 2000°C, microvoid coalescence ahead of the crack tip caused failure.

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“…For example, adding ZrC to ZrB 2 , which introduces a secondary phase (along with pores and impurities), leads to a significant decrease in grain size. [ 50 ] This effect can also be seen when TaC is added to TiB 2 , TaC to TiC, and TaSi 2 to HfB 2 –SiC. [ 51–54 ] All of the aforementioned examples probe grain size reduction with respect to the Zener pinning effect, a mechanism common in multiphase carbides.…”

Section: Resultsmentioning

confidence: 99%

Densification and Fracture Responses of (Ta_1−xW_x)C–WC Composites

et al. 2022

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The mechanical behavior of 90 vol% (Ta1−xWx)C–10 vol% WC (x ≈ 0.2) [90(Ta0.8W0.2)C–10WC] composites is described, achieving a significant enhancement in mean fracture strength compared with nominally pure TaC prepared under identical processing conditions (from 114 to 362 MPa), and a higher characteristic strength (from 188 to 377 MPa), while maintaining the same Weibull modulus of 13. The fracture strengths correspond to calculated critical flaw sizes in the range of 5–10 μm and are consistent with the microstructure observations presented. The 90(Ta0.8W0.2)C–10WC composite begins densification at an onset sintering temperature of 1503 K, which is 500 K lower than TaC. It also exhibits enhanced densification by inhibiting grain growth at sintering temperatures up to 2173 K, therefore resulting in a relative density of 98% compared with 80% for TaC. These results show a promising guideline from which ceramic additions can be chosen to enhance the densification and functionality of ultrahigh‐temperature ceramics.

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Sintering and recrystallization of ZrC-ZrB2 compacts

Cited by 13 publications

References 3 publications

Effect of HfB2 on microstructure and mechanical properties of ZrB2–SiC-based composites

Effect of HfB2 on microstructure and mechanical properties of ZrB2–SiC-based composites

Ultra‐High Temperature Mechanical Properties of a Zirconium Diboride–Zirconium Carbide Ceramic

Densification and Fracture Responses of (Ta_1−xW_x)C–WC Composites

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Sintering and recrystallization of ZrC-ZrB2 compacts

Cited by 13 publications

References 3 publications

Effect of HfB2 on microstructure and mechanical properties of ZrB2–SiC-based composites

Effect of HfB2 on microstructure and mechanical properties of ZrB2–SiC-based composites

Ultra‐High Temperature Mechanical Properties of a Zirconium Diboride–Zirconium Carbide Ceramic

Densification and Fracture Responses of (Ta1−xWx)C–WC Composites

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Densification and Fracture Responses of (Ta_1−xW_x)C–WC Composites