Sintering kinetics of tantalum carbide

Kislyi, P. S.; Shvab, S. A.; Egorov, F. F.

doi:10.1007/bf00795880

Cited by 4 publications

(5 citation statements)

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“…Equation (5) Figure 3. Nominal fracture strengths of TaC ceramics reported in this study and by others [19,24,25,29,51,[58][59][60][61][62][63] as a function of density, showing density-dependent and flaw-dependent strength regimes.…”

Section: Critical Flaw Size Analysis Of Fracture Specimenssupporting

confidence: 73%

“…Generally, densification of TaC is simultaneously accompanied by grain growth, which is often cited as the main reason for trapping porosity in the microstructure. [24][25][26][27][28][29][30] Grain growth occurs rapidly in the initial stages of sintering, after which growth obeys a linear law. [24] At sintering temperatures of 2073 K, densification is observed with rapid grain growth, causing pores to become trapped in the microstructure and negatively affecting the densification process.…”

Section: Introductionmentioning

confidence: 99%

“…[27] Avoiding TaC grain growth is challenging because the activation energies for sintering and grain growth are similar, causing rapid grain growth even in the initial stages of sintering. [23,25,27,[31][32][33] An applied pressure can lower the activation energy for sintering, reducing sintering temperature without affecting the activation energy for grain growth and thus resulting in the suppression of undesirable grain growth. Bakshi et al [21,22] prepared fully dense TaC from submicrometer TaC powder using 263-363 MPa of applied pressures.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Critical Flaw Size Analysis Of Fracture Specimenssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…However, the strengths reported for TaC 1Àx are typically lower than theoretical (100-500 MPa) [5,16,[20][21][22][23][24][25][26], an effect that is well understood for brittle materials and related to pre-existing flaws in the material. Pores are a dominant type of flaw in TaC 1Àx , a consequence of the difficulty in producing dense samples [6,7,22,25,[27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, metallic bonding contributes to good electrical and thermal conductivity at room temperature. Therefore, this material has an interesting combination of properties that in some respects are intermediate between typical ceramics and metals [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%