Mechanical properties and toughening mechanism of WC-doped ZrB<inf>2</inf>–ZrSi<inf>2</inf> ceramic composites by hot pressing: Fid-Bau Portal

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Mechanical properties and toughening mechanism of WC-doped ZrB2–ZrSi2 ceramic composites by hot pressing

Sha, J.J. / Wei, Z.Q. / Li, J. / Zhang, Z.F. / Yang, X.L. / Zhang, Y.C. / Dai, J.X.

Highlights • Nearly full dense WC-doped ZrB2–ZrSi2 composites were fabricated at 1550°C. • The doping of WC refined the grain size and led to an anisotropic grain growth. • Pull out of the elongated grains improved the fracture toughness.

Abstract WC-doped ZrB2–ZrSi2 ceramic composites were fabricated by hot pressing at temperatures ranging from 1450°C to 1550°C. The influence of ZrSi2 content on the mechanical properties of the composites was investigated by means of three point bending test and single edge notched-beam test, respectively. The microstructure and phase composition were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis. The results revealed that: (i) the highest relative density was 99.5% for the composite fabricated at 1550°C; (ii) the doping of WC refined the grain size and led to an anisotropic grain growth which was evidenced by the occurrence of elongated grains; (iii) the highest strength and fracture toughness were 585MPa and 6.87MPam^1/2, respectively; (iv) the main toughening mechanism was considered as the pull out of elongated grains and the deflection of cracks.

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Mechanical properties and toughening mechanism of WC-doped ZrB2–ZrSi2 ceramic composites by hot pressing

Sha, J.J. / Wei, Z.Q. / Li, J. / Zhang, Z.F. / Yang, X.L. / Zhang, Y.C. / Dai, J.X.

Highlights • Nearly full dense WC-doped ZrB2–ZrSi2 composites were fabricated at 1550°C. • The doping of WC refined the grain size and led to an anisotropic grain growth. • Pull out of the elongated grains improved the fracture toughness.

Abstract WC-doped ZrB2–ZrSi2 ceramic composites were fabricated by hot pressing at temperatures ranging from 1450°C to 1550°C. The influence of ZrSi2 content on the mechanical properties of the composites was investigated by means of three point bending test and single edge notched-beam test, respectively. The microstructure and phase composition were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis. The results revealed that: (i) the highest relative density was 99.5% for the composite fabricated at 1550°C; (ii) the doping of WC refined the grain size and led to an anisotropic grain growth which was evidenced by the occurrence of elongated grains; (iii) the highest strength and fracture toughness were 585MPa and 6.87MPam^1/2, respectively; (iv) the main toughening mechanism was considered as the pull out of elongated grains and the deflection of cracks.

Mechanical properties and toughening mechanism of WC-doped ZrB2–ZrSi2 ceramic composites by hot pressing

Sha, J.J. / Wei, Z.Q. / Li, J. / Zhang, Z.F. / Yang, X.L. / Zhang, Y.C. / Dai, J.X.

Highlights • Nearly full dense WC-doped ZrB2–ZrSi2 composites were fabricated at 1550°C. • The doping of WC refined the grain size and led to an anisotropic grain growth. • Pull out of the elongated grains improved the fracture toughness.

Abstract WC-doped ZrB2–ZrSi2 ceramic composites were fabricated by hot pressing at temperatures ranging from 1450°C to 1550°C. The influence of ZrSi2 content on the mechanical properties of the composites was investigated by means of three point bending test and single edge notched-beam test, respectively. The microstructure and phase composition were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis. The results revealed that: (i) the highest relative density was 99.5% for the composite fabricated at 1550°C; (ii) the doping of WC refined the grain size and led to an anisotropic grain growth which was evidenced by the occurrence of elongated grains; (iii) the highest strength and fracture toughness were 585MPa and 6.87MPam^1/2, respectively; (iv) the main toughening mechanism was considered as the pull out of elongated grains and the deflection of cracks.

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Titel:

Mechanical properties and toughening mechanism of WC-doped ZrB2–ZrSi2 ceramic composites by hot pressing

Beteiligte:

Sha, J.J. (Autor:in) / Wei, Z.Q. (Autor:in) / Li, J. (Autor:in) / Zhang, Z.F. (Autor:in) / Yang, X.L. (Autor:in) / Zhang, Y.C. (Autor:in) / Dai, J.X. (Autor:in)

Erscheinungsdatum:

30.04.2014

Format / Umfang:

6 pages

ISSN:

DOI:

https://doi.org/10.1016/j.matdes.2014.04.083

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Englisch

Schlagwörter:

ZrB<inf>2</inf> , Ceramic composite , Mechanical properties , Toughening mechanism

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