钨添加对Si<sub>3</sub>N<sub>4</sub>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

硅酸盐通报, 2023, 42 (1): 287, 网络出版: 2023-03-16

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

论文大纲

杨超周存龙 ^*王强杨元清郝瑞杰

作者单位

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

Si3N4陶瓷钨气压烧结微观结构致密性弯曲强度断裂韧性 Si3N4 ceramics tungsten pneumatic sintering microstructure compactness bending strength fracture toughness

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·m1/2, 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。

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·m1/2, 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.

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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. 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.

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