Effect and Toughening Mechanism of Tungsten Addition on Mechanical Properties of Si3N4 Ceramics

Abstract

Abstract: To toughen Si₃N₄-based ceramic materials, W/Si₃N₄ composite ceramic materials were prepared in this article by the pneumatic sintering method with tungsten (W) as the second phase material and Y₂O₃-Al₂O₃ as sintering additive. Then the effect of W content on the compactness, mechanical properties, and microstructure of W/Si₃N₄ composite ceramic materials was investigated. The results indicate that the densities of samples all reach more than 97% when the W content is less than 5% (mass fraction). The most outstanding overall performance of W/Si₃N₄ composite ceramic materials is obtained when W content is 5% (mass fraction), and the bending strength, hardness, and fracture toughness are (670.28±40.00) MPa, (16.42±0.22) GPa, and (8.04±0.16) MPa·m^1/2, respectively, which are 38.08%, 13.08%, and 44.34% higher than Si₃N₄ ceramic materials without the addition of metal W. By analyzing the microstructure of the polished surface and indentation cracks of W/Si₃N₄ composite ceramic material samples, it is found that the introduction of W can trigger toughening mechanisms such as deflection and bifurcation of cracks in the propagation path, and consume crack expansion energy, thus improving the fracture toughness of Si₃N₄ ceramics.

Key words: Si₃N₄ ceramics, tungsten, pneumatic sintering, microstructure, compactness, bending strength, fracture toughness

CLC Number:

TQ174

YANG Chao, ZHOU Cunlong, WANG Qiang, YANG Yuanqing, HAO Ruijie. Effect and Toughening Mechanism of Tungsten Addition on Mechanical Properties of Si₃N₄ Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(1): 287-294.

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Effect and Toughening Mechanism of Tungsten Addition on Mechanical Properties of Si₃N₄ Ceramics

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