Fracture Toughness / Fracture Energy Data for Ceramics

NIST Standard Reference Database 138


Reference:

Reference: NIST Structural Ceramics Database

Other material collections: Property Data Summaries



Other Toughness materials

Sialon ( Si6-xAlxOxN8-x )

Material Summary:

                      [Ref. 1]                  [Ref. 2]                  [Ref. 3]
Manufacturer........: In laboratory             In laboratory             In laboratory
Material Designation: sialon                    sialon                    sialon
Material Form.......: polycrystal               polycrystal               polycrystal
Composition.........: Si6-xAlxOxN8-x              Si6-xAlxOxN8-x              Si6-xAlxOxN8-x
  (mass fraction)                                 + 1 % Y2O3
Processing..........: hot isostatic pressed     hot isostatic pressed     hot pressed
                       and sintered              and sintered
                      [Ref. 4]                  [Ref. 5]
Manufacturer........: In laboratory             In laboratory
Material Designation: sialon (x-phase)          sialon
Material Form.......: polycrystal               polycrystal
Composition.........: Si6-xAlxOxN8-x              Si6-xAlxOxN8-x 
Processing..........: sintered                  sintered

References:

[1] T. Ekstrom and P.O. Olsson, "Beta-Sialon Ceramics Prepared at 1700 °C by Hot Isostatic Pressing," Journal of the American Ceramic Society, Vol. 72, pp. 1722-1724 (1989).

[2] T. Ekstrom, P.O. Kall, M. Nygren, and P.O. Olsson, "Dense Single-Phase Beta-Sialon Ceramics by Glass-Encapsulated Hot Isostatic Pressing," Journal of Materials Science, Vol. 24, pp. 1853-1862 (1989).

[3] K. Kishi, S. Umebayashi, and E. Tani, "Influence of Microstructure on Strength and Fracture Toughness of Beta-Sialon," Journal of Materials Science, Vol. 25, pp. 2780-2784 (1990).

[4] C. C. Anya and A. Hendry, "Hardness, Indentation Fracture Toughness, and Compositional Formula of X-Phase Sialon," Journal of Materials Science, Vol. 29, PP. 527-533 (1994).

[5] J. Piekarczyk, J. Lis, and J. Bialoskorski, "Elastic Properties, Hardness, and Indentation Fracture Toughness of beta-Sialons," Key Engineering Materials, Vol. 89-91, pp. 541-546 (1994).

Property Table:

Temperature = 23 °C
Grain    Porosity    Fracture      Fracture   Measurement  Measurement  Comments
Size                 Toughness     Energy     Method       Environment
[µm]       [%]       [MPa·m1/2]     [J/m2] 
------   --------   ------------   ---------  -----------  -----------  --------------------------------
                        3.05                     ICS           air       Ref. 1; 0.1  = x of Alx; 3.16 g/cm3
                        2.90                     ICS                             0.5  = x of Alx; 3.14 g/cm3
                        2.75                     ICS                             1.0  = x of Alx; 3.10 g/cm3
                        2.70                     ICS                             1.4  = x of Alx; 3.09 g/cm3
                        2.65                     ICS                             1.75 = x of Alx; 3.06 g/cm3
                        3.15                     ICS                             2.0  = x of Alx; 3.14 g/cm3
                        3.75                     ICS                             2.25 = x of Alx; 3.29 g/cm3
--------------------------------------------------------------------------------------------------------
                        3.80                     ICS           air       Ref. 2; 0.25 = x of Alx; 3.18 g/cm3
                        3.72                     ICS                             0.35 = x of Alx; 3.17 g/cm3
                        3.52                     ICS                             0.50 = x of Alx; 3.16 g/cm3
                        3.44                     ICS                             0.75 = x of Alx; 3.16 g/cm3
                        3.26                     ICS                             1.50 = x of Alx; 3.13 g/cm3
                        2.99                     ICS                             2.00 = x of Alx; 3.11 g/cm3
                        2.79                     ICS                             3.00 = x of Alx; 3.08 g/cm3
                        3.00                     ICS                             4.00 = x of Alx; 3.08 g/cm3
                        3.18                     ICS                             4.20 = x of Alx; 3.14 g/cm3
                        3.66                     ICS                             4.50 = x of Alx; 3.22 g/cm3
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                        3.2                      ICS           air       Ref. 3; 0.5  = x of Alx; 3.14 g/cm3
--------------------------------------------------------------------------------------------------------
 1.6                    3.3                      ICS           air       Ref. 4; density = 3.01 g/cm3
 2.0                    3.5                      ICS                             density = 3.11 g/cm3
 2.7                    3.1                      ICS                             density = 3.01 g/cm3
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                        4.65        87.9         ICS           air       Ref. 5; 1 = x of Alx; 3.09 g/cm3
                                                                                       H/E = 0.055
                        3.42        55.4         ICS                             2 = x of Alx; 3.05 g/cm3
                                                                                       H/E = 0.054
                        3.38        56.0         ICS                             3 = x of Alx; 3.06 g/cm3
                                                                                       H/E = 0.058
                        3.29        60.5         ICS                             4 = x of Alx; 3.00 g/cm3
                                                                                       H/E = 0.065
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