Mechanical Properties of α- and β-SiAlON Composite Ceramics Using β-SiAlON Powder

Abstract:

β-SiAlON powder was used as a raw powder to fabricate α/β-SiAlON composite ceramics with different rare earth elements. The phases present in the sample fabricated from -SiAlON, α-Si3N4, AlN, and rare earth oxide powders were - and -SiAlONs. The composition was dependent on the chemical composition and firing profile. The sample obtained by adding Yb2O3 had a high -SiAlON content. The /-SiAlON composite ceramics had high densit. Their microstructures depended on the used metal oxides, namely, the addition of Nd2O3 and CaCO3 resulted in the elongation of the -SiAlON grains. The bending strength, fracture toughness, and hardness were influenced by the -SiAlON content, amount of elongated grains, and density of the sample.

• Periodical: Key Engineering Materials (Volume 403)
• Pages: 111-114
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.403.111
• Online since: December 2008
• Authors: Kei Asakoshi, Junichi Tatami, Katsutoshi Komeya, Takeshi Meguro, Masahiro Yokouchi
• Keywords: Composite, Low Cost, Rare Earth (RE), ß-SiAlON

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3.

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[1] [2] [1] [4] [1] [6] [1] [8] [2] [0] 1Y-9Nd 1Yb-9Nd 10Ca 10Nd 10Y 10Yb 5 6 7 8 9 1Y-9Nd 1Yb-9Nd 10Ca 10Nd 10Y 10Yb.

[20] [0] [30] [0] [40] [0] [50] [0] [60] [0] [70] [0] [80] [0] 1Y-9Nd 1Yb-9Nd 10Ca 10Nd 10Y 10Yb (a) Bulk density [g/cm3] (b) Vickers hardness [GPa] (c) Bending strength [MPa] (d) Fracture toughness [MPa・m1/2] Fig. 4. Density and Mechanical properties of the sintered bodies.