Kai Meng, Chuanzhen Huang, Zhenyu Shi, Longhua Xu, Zhen Wang, Shuiquan Huang, Meina Qu, Zhengkai Xu, Dijia Zhang, Baosu Guo, Hanlian Liu, Dun Liu, Peng Yao
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引用次数: 0
Abstract
Si3N4 is a low thermal expansion, high-performance structural ceramic that is widely used in extreme environments. However, the excessively high sintering temperatures required for densification limit further applications and the improvement of mechanical properties. In the present study, a high-performance Si3N4-TiB2 ceramic was fabricated at a lower sintering temperature. The effect of TiB2 content, sintering temperature, and holding time on the microstructure, mechanical properties, grain size distribution, and fracture surface energy of the ceramic was systematically investigated. The results showed that the TiB2 addition primarily improves the ceramic's properties by reducing the porosity defects and improving the densification and grain boundary adhesion strength. When the TiB2 content is 9 Vol%, the Si3N4-TiB2 ceramic exhibits optimal mechanical properties. The Vickers hardness, fracture toughness, and flexural strength were 16.7 ± 0.3 GPa, 8.0 ± 0.15 MPa·m1/2, and 655 ± 13 MPa. In addition, the TiB2 addition can reduce the densification temperature of Si3N4-TiB2 ceramic, enhance the densification of the ceramic, refine the grain structure, improve the grain distribution of the Si3N4-TiB2 ceramic, and notably improve the material hardness and fracture toughness. The toughening mechanisms in the Si3N4-TiB2 ceramic are the synergistic effects of crack deflection, transgranular fracture, grain pull-out, and grain bridging.
期刊介绍：
The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas:
Nanotechnology applications;
Ceramic Armor;
Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors);
Ceramic Matrix Composites;
Functional Materials;
Thermal and Environmental Barrier Coatings;
Bioceramic Applications;
Green Manufacturing;
Ceramic Processing;
Glass Technology;
Fiber optics;
Ceramics in Environmental Applications;
Ceramics in Electronic, Photonic and Magnetic Applications;
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