On the fabrication and mechanical properties of Si3N4 ceramics with low content sintering additives |
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| Authors: | Luchao Sun Yandong Tang Yang Cui Tiefeng Du Cui Zhou Beiyue Ma Jingyang Wang |
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| Affiliation: | 1. Advanced Ceramics and Composites Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China;2. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang, China;3. Advanced Ceramics and Composites Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, China |
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| Abstract: | Si3N4 ceramics were prepared by hot pressing (HP) and spark plasma sintering (SPS) methods using low content (5 mol%) Al2O3–RE2O3(RE = Y, Yb, and La)–SiO2/TiN as sintering additives/secondary additives. The effects of sintering additives and sintering methods on the composition, microstructures, and mechanical properties (hardness and fracture toughness) were investigated. The results show that fully density Si3N4 ceramics could be fabricated by rational tailoring of sintering additives and sintering method, and TiN secondary additive could promote the density during HP and SPS. Besides, SN-AYS-SPS possesses the most competitive mechanical properties among all the as-prepared ceramics with the Vickers hardness as 17.31 ± .43 GPa and fracture toughness as 11.07 ± .48 MPa m1/2. |
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| Keywords: | hot pressing silicon nitride sintering additives spark plasma sintering |
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