Fabrication of Continuously Gradient Si3N4/SiC Composite Ceramics via Pseudo Hot Isostatic Pressing

doi:10.16552/j.cnki.issn1001-1625.2025.0535

Abstract

Abstract: To solve the interfacial thermal expansion coefficient mismatch problem in traditional functionally gradient ceramics, a new method for fabricating continuously gradient Si₃N₄/SiC composite ceramics via PHIP was proposed. By combining gas-phase gradient diffusion with in-situ chemical reactions, the continuous gradient Si₃N₄/SiC composite ceramics were successfully prepared using a single powder system under uniform thermal field. The results show that gradient ceramics exhibit the phase composition characteristics of high α-Si₃N₄ content at the edge and high β-Si₃N₄ content inside. The microstructure is manifested as a high proportion of small-sized granular grains at the edge and a high proportion of large-sized rod-shaped grains inside. The Vickers hardness gradually decreases from the edges toward the interior, from 20.17 GPa to 17.56 GPa. Different nano-SiC content (5%, 10%, 20%, volume fraction) significantly influences gradient layer thickness, where the gray-green hard layer thickness increasing from 128 μm to 258 μm as the SiC content increases.

Key words: Si₃N₄/SiC composite ceramic, continuous gradient structure, pseudo hot isostatic pressing sintering, gradient layer control, surface hardness, fracture toughness, flexural strength

CLC Number:

TQ174

HE Yanbo, HU Lanxin, TONG Yingxuan, ZHANG Yunshan, AN Chengbo, SHI Yunwei, HE Qianglong, WANG Weimin. Fabrication of Continuously Gradient Si₃N₄/SiC Composite Ceramics via Pseudo Hot Isostatic Pressing[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(12): 4517-4525.

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Fabrication of Continuously Gradient Si₃N₄/SiC Composite Ceramics via Pseudo Hot Isostatic Pressing

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