Influence of Yb₂O₃ and Y₂O₃ on the Mechanical Properties of Porous Si₃N₄ Ceramics

Abstract:

Using Yb₂O₃ or Y₂O₃ as s single sintering additive, the porous Si₃N₄ ceramics with excellent mechanical properties were successfully fabricated by pressureless sintering. The influence of Y₂O₃ and Yb₂O₃ on the microstructure and mechanical properties of porous Si₃N₄ ceramics was investigated. The results show that both sintering additives can effectively promote α to β phase transformation, and microstructures with elongated β-Si₃N₄ grains interlocking and superimposing on each other can be obtained. However, sinterability, phase transformation and mechanical properties of the porous Si₃N₄ ceramics with Yb₂O₃ were more excellent than the ceramics with Y₂O₃. The specimens with Yb₂O₃ had high aspect ratio β-Si₃N₄ grains, and formed the high melting crystalline Yb₄Si₂N₂O₇.

• Periodical: Materials Science Forum (Volume 816)
• Pages: 91-95
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.816.91
• Online since: April 2015
• Authors: Chuan Bing Cheng, Run Hua Fan, Fu Tian Liu*, Chong Hai Wang, Hong Sheng Wang, Chang Ling Zhou
• Keywords: Porous Si₃N₄ Ceramics, Ytterbia, Yttria

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