Arc Melting and Homogenization of ZrC and ZrC+B Alloys

Darolia, R.; Archbold, T.F.

doi:10.1016/s0026-0800(73)80007-2

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…The as-synthesized layered carbides contain elongated and plate-like grains, while the arcmelted ZrC contains large equiaxed grains. 21,35 As in the cases of Si 3 N 4 36,37 and SiC, 38,39 elongated grains benefit high energy dissipation during fracture and consequently lead to high fracture toughness. Thus, the irregular fracture surface topography of layered carbides containing the elongated grains may be the main reason for their relatively high fracture toughness.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the irregular fracture surface topography of layered carbides containing the elongated grains may be the main reason for their relatively high fracture toughness. However, the fracture strength and fracture toughness of Zr-Al-Si-C and Zr-Al-C are much lower than those of self-reinforced Si 3 N 4 [34][35][36][37] and SiC 38,39 although all their microstructures are composed of elongated and plate-like grains. Like in Si 3 N 4 , 34 higher fracture strength combined with higher fracture toughness can be developed in Zr-Al-Si-C and Zr-Al-C by control of the grain size and amount of well-dispersed large elongated grains in a fine-grained matrix.…”

Section: Resultsmentioning

confidence: 99%

“…Improved toughness of layered carbides with respect to ZrC should mainly be associated with the grain morphology. The as‐synthesized layered carbides contain elongated and plate‐like grains, while the arc‐melted ZrC contains large equiaxed grains 21,35 . As in the cases of Si 3 N 4 36,37 and SiC, 38,39 elongated grains benefit high energy dissipation during fracture and consequently lead to high fracture toughness.…”

Section: Resultsmentioning

confidence: 99%

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Mechanical and Thermophysical Properties of Zr–Al–Si–C Ceramics

Bao

Wang

et al. 2009

Journal of the American Ceramic Society

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The mechanical and thermophysical properties of quaternary‐layered carbides, Zr2[Al(Si)]4C5 and Zr3[Al(Si)]4C6 have been investigated and compared with those of Zr2Al3C4 and Zr3Al3C5. These four carbides are generally alike in mechanical and thermophysical properties due to their similar crystal structures that consisting of alternatively stacked ZrC layers and Al3C2/[Al(Si)]4C3 slabs. The layer thickness of zirconium carbide and aluminum carbide has effects on their properties. Thicker layer of zirconium carbide and/or thinner layer of aluminum carbides are in favor of stiffness, hardness, thermal, and electrical conductivities, but go against density, specific stiffness, Debye temperature, and coefficient of thermal expansion.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Mechanical and Thermophysical Properties of Zr–Al–Si–C Ceramics

Bao

Wang

et al. 2009

Journal of the American Ceramic Society

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“…Improved toughness should mainly be associated with the grain morphology. The as‐synthesized Zr 3 Al 3 C 5 contains elongated grains, resembling short fibers, while the arc‐melted ZrC contains large equiaxed grains 6,31 . As in the cases of Si 3 N 4 32,33 and SiC 34 , elongated grains promote high‐energy dissipation during fracture and consequently lead to high fracture toughness.…”

Section: Discussionmentioning

confidence: 99%

Synthesis, Physical, and Mechanical Properties of Bulk Zr₃Al₃C₅Ceramic

Zhou

Bao

et al. 2007

Journal of the American Ceramic Society

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An in situ reactive hot‐pressing process using zirconium (zirconium hydride), aluminum, and graphite as staring materials and Si and Y2O3 as additives was used to synthesize bulk Zr3Al3C5 ceramics. This method demonstrates the advantages of easy synthesis, lower sintering temperature, high purity and density, and improved mechanical properties of synthesized Zr3Al3C5. Its electrical and thermal properties were measured. Compared with ZrC, Zr3Al3C5 has a relatively low hardness (Vickers hardness of 12.5 GPa), comparable stiffness (Young's modulus of 374 GPa), but superior strength (flexural strength of 488 GPa) and toughness (fracture toughness of 4.68 MPa·m1/2). In addition, the stiffness decreases slowly with increasing temperature and at 1600°C remains 78% of that at ambient temperature, indicating that Zr3Al3C5 is a potential high‐temperature structural ceramic.

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