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

NT-154 ( Si3N4 )

Material Summary:


                      [Ref. 1,2,3]                         
Manufacturer........: Norton/TRW          
Material Designation: NT-154  
Material Form.......: polycrystal     
Composition.........: Si3N4             
Processing..........: sintered and 
                      hot isostatically pressed

References:

[1] N.L. Hecht, D.E. McCullum, and G.A. Graves, "Investigation of Selected Si3N4 and SiC Ceramics," Ceramic Materials and Components for Engines, pp. 806-816 (1988). [2] D.E. McCullum, N.L. Hecth, L. Chuck, and S.M. Goodrich, "Summary of Results of the Effects of Environment on Mechanical Behavior of High-Performance Ceramics," Ceramic Engineering and Science Proceedings, Vol. 12, pp. 1886-1913 (1991).

[3] R. J. Gettings and G. D. Quinn, "Surface Crack in Flexure (SCF) Measurements of the Fracture Toughness of Advanced Ceramics," Ceramic Engineering and Science Proceedings, Vol. 16, pp. 539-544 (1995)

Property Table:

Temperature = 23 °C
Grain    Porosity    Fracture      Fracture   Measurement  Measurement  Comments
Size                 Toughness     Energy     Method       Environment
[µm]       [%]       [MPa·m1/2]     [J/m2] 
------   --------   ------------   ---------  -----------  -----------  --------------------------------
                        3.8                      ICS          air       Ref. 1; 3.24 g/cm3; E = 314 GPa;
                                                                                 H = 14 GPa
--------------------------------------------------------------------------------------------------------
                        3.2                      CF           air       Ref. 2; 3.23 g/cm3; E = 310 GPa;
                                                                                 H = 15.9 GPa
--------------------------------------------------------------------------------------------------------
                        3.70                     SCF          air       Ref. 3; E = 320 GPa, nu = 0.27,
                                                                                density = 3.23 g/cm3
--------------------------------------------------------------------------------------------------------