Effect of pressure on the sintering mechanisms of tantalum carbide ceramics

High pressure sintering shows great superiority in promoting the densification of the hard‐to‐densify refractory ceramics, and the underlying mechanisms are thus of great interest. In the present work, the densification process of tantalum carbide (TaC) ceramics affected by pressure was discussed th...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2025-02, Vol.108 (2), p.n/a
Main Authors: Gu, Junfeng, Ma, Peiyan, Wang, Hao, Wang, Weimin, Fu, Zhengyi
Format: Article
Language:English
Subjects:
carbides
Ceramics
Deformation mechanisms
Densification
Diffusion
Dislocation density
Grain boundary diffusion
Grain growth
High pressure
Hot pressing
Mass transport
Microstructure
Plastic deformation
Pressure effects
sintering
Tantalum
Tantalum carbide
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Summary:High pressure sintering shows great superiority in promoting the densification of the hard‐to‐densify refractory ceramics, and the underlying mechanisms are thus of great interest. In the present work, the densification process of tantalum carbide (TaC) ceramics affected by pressure was discussed through comparing the microstructural characteristics and sintering kinetics. The TaC ceramics sintered at 30–250 MPa show dense and uniform microstructure without oxide impurities and high‐density dislocations. With the increase of sintering pressure, particle rearrangement becomes prominent at initial stage, whereas grain boundary diffusion rather than lattice diffusion dominants the final stage mechanism. Grain growth is enhanced under high pressure through the plastic deformation process. Our work should facilitate to understand the mass transport mechanisms during the high pressure sintering or deformation process of carbide ceramics.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.20227