Dynamic hot forging preparation of textured Si3N4 ceramics with high performance

DU Xuanhao; YAO Shu; FAN Jianye; GUO Huimin; CAI Silong; ZHAO Yulong; ZHAO Ke; LIU Jinling; LIU Dianguang

doi:10.19976/j.cnki.43-1448/TF.2025028

Materials Science and Engineering of Powder Metallurgy >

2025 , Vol. 30 >Issue 5: 424 - 432

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2025028

Engineering and Technology

Dynamic hot forging preparation of textured Si₃N₄ ceramics with high performance

DU Xuanhao ,
YAO Shu ,
FAN Jianye ,
GUO Huimin ,
CAI Silong ,
ZHAO Yulong ,
ZHAO Ke ,
LIU Jinling ,
LIU Dianguang

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1. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu 611756, China

Received date: 2025-03-21

Revised date: 2025-10-05

Online published: 2025-11-27

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Abstract

Si₃N₄ ceramics exhibit excellent mechanical properties due to their strong covalent bonding characteristics, however, this characteristic makes them difficult to secondary process, severely limiting their widespread industrial applications. In this study, dynamic hot forging (DHF) technology was employed to process commercial Si₃N₄ ceramics, the effects of hot forging temperature on the microstructure and mechanical properties of materials were studied. The results indicate that under a dynamic pressure of (60±5) MPa and a hot forging temperature of 1 800 ℃, the Si₃N₄ ceramics exhibit optimal mechanical properties, with a hardness of 13.84 GPa, a fracture toughness of 6.88 MPa·m^1/2, and a bending strength reaching 925 MPa. All performance metrics significantly surpassing those of the original samples. This performance enhancement is primarily attributed to two key factors: firstly, the elimination of defects such as pores during the hot forging process, and secondly, the structural texturing effect induced by dynamic pressure. The DHF technology developed in this study provides an effective new method for the secondary processing and strengthening of high-performance difficult-to-machine ceramic materials.

Key words： hot forging; dynamic pressure; silicon nitride; texturing; mechanical property

Cite this article

DU Xuanhao , YAO Shu , FAN Jianye , GUO Huimin , CAI Silong , ZHAO Yulong , ZHAO Ke , LIU Jinling , LIU Dianguang . Dynamic hot forging preparation of textured Si₃N₄ ceramics with high performance[J]. Materials Science and Engineering of Powder Metallurgy, 2025 , 30(5) : 424 -432 . DOI: 10.19976/j.cnki.43-1448/TF.2025028

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