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Journal Article

Hard and tough novel high-pressure γ-Si3N4/Hf3N4 ceramic nanocomposites

Authors

Li,  Wei
External Organizations;

Yu,  Zhaoju
External Organizations;

Wiehl,  Leonore
External Organizations;

Jiang,  Tianshu
External Organizations;

Zhan,  Ying
External Organizations;

Ricohermoso,  Emmanuel III
External Organizations;

Etter,  Martin
External Organizations;

Ionescu,  Emanuel
External Organizations;

Wen,  Qingbo
External Organizations;

/persons/resource/lathe

Lathe,  Christian
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Farla,  Robert
External Organizations;

Teja,  Dharma Teppala
External Organizations;

Bruns,  Sebastian
External Organizations;

Widenmeyer,  Marc
External Organizations;

Weidenkaff,  Anke
External Organizations;

Molina-Luna,  Leopoldo
External Organizations;

Riedel,  Ralf
External Organizations;

Bhat,  Shrikant
External Organizations;

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Fulltext (public)

5022620.pdf
(Publisher version), 2MB

Supplementary Material (public)
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Citation

Li, W., Yu, Z., Wiehl, L., Jiang, T., Zhan, Y., Ricohermoso, E. I., Etter, M., Ionescu, E., Wen, Q., Lathe, C., Farla, R., Teja, D. T., Bruns, S., Widenmeyer, M., Weidenkaff, A., Molina-Luna, L., Riedel, R., Bhat, S. (2023): Hard and tough novel high-pressure γ-Si3N4/Hf3N4 ceramic nanocomposites. - Journal of Advanced Ceramics, 12, 7, 1418-1429.
https://doi.org/10.26599/JAC.2023.9220764


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022620
Abstract
Cubic silicon nitride (γ-Si3N4) is superhard and one of the hardest materials after diamond and cubic boron nitride (cBN), but has higher thermal stability in an oxidizing environment than diamond, making it a competitive candidate for technological applications in harsh conditions (e.g., drill head and abrasives). Here, we report the high-pressure synthesis and characterization of the structural and mechanical properties of a γ-Si3N4/Hf3N4 ceramic nanocomposite derived from single-phase amorphous silicon (Si)–hafnium (Hf)–nitrogen (N) precursor. The synthesis of the γ-Si3N4/Hf3N4 nanocomposite is performed at ~20 GPa and ca. 1500 ℃ in a large volume multi anvil press. The structural evolution of the amorphous precursor and its crystallization to γ-Si3N4/Hf3N4 nanocomposites under high pressures is assessed by the in situ synchrotron energy-dispersive X-ray diffraction (ED-XRD) measurements at ~19.5 GPa in the temperature range of ca. 1000–1900 ℃. The fracture toughness (KIC) of the two-phase nanocomposite amounts ~6/6.9 MPa·m1/2 and is about 2 times that of single-phase γ-Si3N4, while its hardness of ca. 30 GPa remains high. This work provides a reliable and feasible route for the synthesis of advanced hard and tough γ-Si3N4-based nanocomposites with excellent thermal stability.