On the fabrication and mechanical properties of Si3N4 ceramics with low content sintering additives. Issue 2 (26th October 2022)

• Record Type: Journal Article
• Authors: Sun, Luchao; Tang, Yandong; Cui, Yang; Du, Tiefeng; Zhou, Cui; Ma, Beiyue; Wang, Jingyang
• Other Names: Fukushima Manabu guestEditor.; Wang Jingyang guestEditor.; Balaya Palani guestEditor.; Kim Young‐Wook guestEditor.; Singh Mrityunjay guestEditor.
• Is Part Of: International journal of applied ceramic technology. Volume 20:Issue 2(2023)
• Page Start: 1269
• Page End: 1277
• Publication Date: 2022-10-26
• Subjects: hot pressing -- silicon nitride -- sintering additives -- spark plasma sintering; Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.14253
• Languages: English
• ISSNs: 1546-542X

Abstract

Abstract: Si3 N4 ceramics were prepared by hot pressing (HP) and spark plasma sintering (SPS) methods using low content (5 mol%) Al2 O3 –RE2 O3 (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 Si3 N4 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 m 1/2 .