钨添加对Si3N4陶瓷力学性能的影响及强韧化机理研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (1): 287-294.

所属专题：陶瓷

钨添加对Si₃N₄陶瓷力学性能的影响及强韧化机理研究

杨超, 周存龙, 王强, 杨元清, 郝瑞杰

太原科技大学机械工程学院,山西省冶金设备设计理论与技术重点实验室,太原 030024

收稿日期:2022-08-22 修订日期:2022-09-23 出版日期:2023-01-15 发布日期:2023-02-15
通信作者: 周存龙,博士,教授。E-mail:zcunlong@tyust.edu.com
作者简介:杨超(1995—),男,硕士研究生。主要从事氮化硅陶瓷材料的研究。E-mail:yangchaowy0411@yeah.net
基金资助:
山西省重点研发计划(201903D421046);山西省科技重大专项(20181102015);太原市2021揭榜项目

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

YANG Chao, ZHOU Cunlong, WANG Qiang, YANG Yuanqing, HAO Ruijie

Shanxi Key Laboratory of Metallurgical Equipment Design Theory and Technology, School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

Received:2022-08-22 Revised:2022-09-23 Online:2023-01-15 Published:2023-02-15

摘要/Abstract

摘要： 为了增韧Si₃N₄基陶瓷材料,以钨(W)作为第二相材料,Y₂O₃-Al₂O₃作为烧结助剂,采用气压烧结法制备了W/Si₃N₄复合陶瓷材料。研究了W含量对W/Si₃N₄复合陶瓷材料致密性、力学性能以及结构的影响。结果表明:在W含量小于5%(质量分数)时,样品致密度均达97%以上;在W含量为5%(质量分数)时,获得的W/Si₃N₄复合陶瓷材料综合性能最佳,弯曲强度、硬度和断裂韧性分别为(670.28±40.00) MPa、(16.42±0.22) GPa和(8.04±0.16) MPa·m^1/2,相比于未添加金属W的Si₃N₄陶瓷材料分别提高了38.08%、13.08%和44.34%;通过分析W/Si₃N₄复合陶瓷材料样品抛光面和压痕裂纹的微观结构,发现W的引入能促使裂纹在扩展路径上更易发生偏转、分叉等增韧机制,消耗裂纹扩展能量,从而改善Si₃N₄陶瓷的断裂韧性。

关键词: Si₃N₄陶瓷, 钨, 气压烧结, 微观结构, 致密性, 弯曲强度, 断裂韧性

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

中图分类号:

TQ174

杨超, 周存龙, 王强, 杨元清, 郝瑞杰. 钨添加对Si₃N₄陶瓷力学性能的影响及强韧化机理研究[J]. 硅酸盐通报, 2023, 42(1): 287-294.

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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钨添加对Si₃N₄陶瓷力学性能的影响及强韧化机理研究

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

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