Microstructure and Phase Composition of Cold Isostatically Pressed and Pressureless Sintered Silicon Nitride

• Published in: Nanoscale research letters Vol. 11; no. 1; p. 148
• Main Authors: Lukianova, O. A., Krasilnikov, V. V., Parkhomenko, A. A., Sirota, V. V.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2016; Springer Nature B.V
• Subjects: Aluminum oxide; Ceramics; Chemistry and Materials Science; Cold isostatic pressing; Cold pressing; Materials Science; Microstructure; Molecular Medicine; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Nanotechnology and Nanomaterials (NANO-2015); Phase composition; Silicon nitride; Sintering; Grain size; Phase composition; Microstructure; Silicon nitride
• ISSN: 1931-7573; 1556-276X
• DOI: 10.1186/s11671-016-1365-1

The microstructure and physical properties of new Y 2 O 3 and Al 2 O 3 oxide-doped silicon nitride ceramics fabricated by cold isostatic pressing and free sintering were investigated. The phase composition of produced material was also studied by X-ray diffraction at room and elevated temperature. The fabricated ceramics featured a microstructure of Si 5 AlON 7 grains with a fine-grained α-Si 3 N 4 with a small amount of Y 2 SiAlON 5 . Described ceramics is attractive for many high-temperature structural applications due to beneficial combination of fine-grained structure with improved mechanical properties and small weight loss.