In Situ Synthesis and Mechanical Properties of TiN-Si₂N₂O-Si₃N₄ Composites

Abstract:

Si3N4-Si2N2O-TiN composite ceramics were in-situ fabricated by using following reactions of (1) 3TiO2 + Si3N4 → 3TiN + 3SiO2 + N2 and (2) Si3N4+ SiO2 → 2Si2N2O. The mixed powder of α-Si3N4, Al2O3, Y2O3 and TiO2 was hot-pressed at 24 MPa and 1800°-1900°C for 1-4 h in N2. Sintered composite ceramics were characterized by XRD, SEM, TEM, four-point bending test and Vickers indentation method. XRD results and TEM observation showed that TiN and amorphous SiO2 were formed at 1250°C by the reaction (1), and the Si2N2O phase formed by reaction (2) above 1800°C. Si3N4-Si2N2O-TiN composites consisted of ≥2 m sized Si2N2O grains with TiN and Si3N4 grains. Hardness and fracture strength of the composites were comparable to those of Si2N2O ceramics, with fracture toughness being improved at 5vol% TiN containing composites.

• Periodical: Key Engineering Materials (Volume 403)
• Pages: 227-230
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.403.227
• Online since: December 2008
• Authors: Hajime Kiyono, Shiro Shimada
• Keywords: Composite, Mechanical Property, Reaction Sintering, Silicon Oxynitride, Titanium Nitride

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[10] [15] [20] [25] [0] [5] [1] 0.

[1] 5.

500 1000 1500 Si3N4.

[7] 5L (a) (b) (c) GPa MPa MPa ・ m1/2 Si2N2O TN3.

[5] 10 13 Sample Fig. 5. Mechanical properties of (a) fracture strength, (b) hardness and (c) fracture toughness for the composites with literature values of monolithic Si3N4 and Si2N2O ceramics.

[10] [15] [20] [25] [0] [5] [1] 0.

[1] 5.

500 1000 1500 Si3N4.

[7] 5L (a) (b) (c) GPa MPa MPa ・ m1/2 Si2N2O TN3.

[5] 10 13 Sample.