Phase Transition and Mechanical Property Modulation of Silicon Nitride at High Temperature and High Pressure

CUI Siwen; LI Shixin; MA Shuailing; LIAN Min; ZHAO Xingbin; TAO Qiang; ZHU Pinwen

doi:10.11858/gywlxb.20251060

Volume 39 Issue 12

Dec 2025

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Chinese Journal of High Pressure Physics > 2025 > 39(12): 120101.

CUI Siwen, LI Shixin, MA Shuailing, LIAN Min, ZHAO Xingbin, TAO Qiang, ZHU Pinwen. Phase Transition and Mechanical Property Modulation of Silicon Nitride at High Temperature and High Pressure[J]. Chinese Journal of High Pressure Physics, 2025, 39(12): 120101. doi: 10.11858/gywlxb.20251060

Citation:

CUI Siwen, LI Shixin, MA Shuailing, LIAN Min, ZHAO Xingbin, TAO Qiang, ZHU Pinwen. Phase Transition and Mechanical Property Modulation of Silicon Nitride at High Temperature and High Pressure[J]. Chinese Journal of High Pressure Physics, 2025, 39(12): 120101. doi: 10.11858/gywlxb.20251060

Citation:

CUI Siwen, LI Shixin, MA Shuailing, LIAN Min, ZHAO Xingbin, TAO Qiang, ZHU Pinwen. Phase Transition and Mechanical Property Modulation of Silicon Nitride at High Temperature and High Pressure[J]. Chinese Journal of High Pressure Physics, 2025, 39(12): 120101. doi: 10.11858/gywlxb.20251060

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Phase Transition and Mechanical Property Modulation of Silicon Nitride at High Temperature and High Pressure

doi: 10.11858/gywlxb.20251060

CUI Siwen^{1, 2
,},
LI Shixin¹,
MA Shuailing^{1,*
,
,},
LIAN Min¹,
ZHAO Xingbin¹,
TAO Qiang²,
ZHU Pinwen^{2,*
,
,}

1.
School of Physical Science and Technology, Institute of High Pressure Physics, Ningbo University, Ningbo 315211, Zhejiang, China
2.
Synergetic Extreme Condition High-Pressure Science Center, Jilin University, Changchun 130012, Jilin, China

Received Date: 24 Mar 2025
Rev Recd Date: 14 Apr 2025

Available Online: 17 Apr 2025

Issue Publish Date: 05 Dec 2025

Abstract

Abstract

Silicon nitride (Si₃N₄) ceramics are a novel category of structural ceramics, exhibiting both high reliability and economy value due to their unique physical and chemical properties. However, their strong covalent bonds make densification challenging, and phase transition control remains an issue. In this study, high temperature and high pressure (HTHP) sintering was utilized in combination with MgO-Y₂O₃ binary additives (mass ratio Si₃N₄∶MgO∶Y₂O₃ = 94∶3∶3) to achieve a synergistic sintering process involving both high pressure and liquid-phase formation. The effects of binary sintering additives on the sintering process, phase transition behavior, microscopic morphology and mechanical properties of Si₃N₄ under high pressure were systematically investigated by designing a two-layer comparative experimental assembly to ensure the same sintering temperature. The results show that the MgO-Y₂O₃ promotes the α→β phase transformation of Si₃N₄ through liquid phase formation, which reduces the phase transition onset temperature from 1800 ℃ to 1650 ℃. Furthermore, high pressure enhances grain rearrangement and densification. As a result, highly dense Si₃N₄ ceramics with an optimal Vickers hardness up to (24.5±1.9) GPa were successfully synthesized. These findings provide an effective strategy for preparing high-performance Si₃N₄ ceramics and hold significant implications for advancements in physics and material science.
- high temperature and high pressure,
- silicon nitride ceramics,
- Vickers hardness,
- densification,
- phase transition

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References(26)

References

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