准热等静压工艺制备连续梯度Si3N4/SiC复合陶瓷

doi:10.16552/j.cnki.issn1001-1625.2025.0535

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (12): 4517-4525.DOI: 10.16552/j.cnki.issn1001-1625.2025.0535

准热等静压工艺制备连续梯度Si₃N₄/SiC复合陶瓷

何彦搏¹, 胡兰馨², 仝颖轩¹, 张云杉¹, 安诚博¹, 师云威^1,3, 何强龙^1,3, 王为民¹

1.武汉理工大学材料科学与工程学院,武汉 430070;
2.武汉商学院机电工程学院,武汉 430056;
3.湖北隆中实验室,襄阳 441000

收稿日期:2025-05-28 修订日期:2025-07-24 出版日期:2025-12-15 发布日期:2025-12-30
通信作者: 师云威,博士研究生。E-mail:1917069803@whut.edu.cn; 何强龙,博士,副教授。E-mail:shsqlhe@whut.edu.cn
作者简介:何彦搏(2003—),男。主要从事氮化硅陶瓷的研究。E-mail:335891@whut.edu.cn
基金资助:
国家重点研发计划(2021YFB3701400);湖北省自然科学基金(2025AFB843)

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

HE Yanbo¹, HU Lanxin², TONG Yingxuan¹, ZHANG Yunshan¹, AN Chengbo¹, SHI Yunwei^1,3, HE Qianglong^1,3, WANG Weimin¹

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. School of Mechanical Engineering, Wuhan Business University, Wuhan 430056, China;
3. Hubei Longzhong Laboratory, Xiangyang 441000, China

Received:2025-05-28 Revised:2025-07-24 Published:2025-12-15 Online:2025-12-30

摘要/Abstract

摘要： 针对传统功能梯度陶瓷存在的界面热膨胀系数失配问题,本文提出一种基于准热等静压工艺制备连续梯度Si₃N₄/SiC复合陶瓷的方法。通过结合气相梯度扩散与原位化学反应,利用单一粉体在均匀热场中成功制备连续梯度Si₃N₄/SiC复合陶瓷。结果表明:梯度陶瓷的物相组成呈现出边缘α-Si₃N₄含量高、内部β-Si₃N₄含量高的特点,微观结构表现为边缘小尺寸颗粒状晶粒占比高,内部大尺寸棒状晶粒占比高;维氏硬度由边缘向内部逐渐降低,由20.17 GPa降低至17.56 GPa。不同纳米SiC含量(5%、10%、20%,体积分数)会对梯度层厚度产生影响,表面灰绿色硬质层厚度随SiC含量增加而逐渐增加,由128 μm增加至258 μm。

关键词: Si₃N₄/SiC复合陶瓷, 连续梯度结构, 准热等静压烧结, 梯度层控制, 表面硬度, 断裂韧性, 抗弯强度

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

中图分类号:

TQ174

何彦搏, 胡兰馨, 仝颖轩, 张云杉, 安诚博, 师云威, 何强龙, 王为民. 准热等静压工艺制备连续梯度Si₃N₄/SiC复合陶瓷[J]. 硅酸盐通报, 2025, 44(12): 4517-4525.

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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准热等静压工艺制备连续梯度Si₃N₄/SiC复合陶瓷

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

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