Sapphire ( Al2O3 )

Reference: NIST Technical Note

Reference: NIST Structural Ceramics Database

Note: About Property Data Summaries.

Note: Abbreviations and Other Notes

Note: Other Materials


Material Summary:

[Ref. 1] [Ref. 2] [Ref. 3] [Ref. 4] [Ref. 5] Manufacturer........: Union Carbide Unknown Unknown Unknown Unknown Material Designation: Sapphire Sapphire Sapphire Sapphire Sapphire Material Form.......: Single Crystal Single Crystal Polycrystal Single Crystal Single Crystal Composition.........: Al2O3 Al2O3 Al2O3 Al2O3 Al2O3 Processing..........:

References:

[1] J. J. Mecholsky, S. W. Freiman, and R. W. Rice, "Fracture Surface Analysis of Ceramics" Journal of Materials Science, Vol. 11, 1310-1319 (1976). [2] M. Iwasa and T. Ueno, "Fracture Toughness of Quartz and Sapphire Single Crystals at Room Temperature" Zairyo, Vol. 30, No. 337, pp. 1001-1004 (1981). [3] S. W. Wiederhorn, "Fracture of Sapphire" Journal of the American Ceramic Society, Vol. 52, No. 9, pp. 485-491 (1969). [4] G. R. Anstis, P. Chantikul, B. R. Lawn, and D. B. Marshall, "A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: I, Direct Crack Measurements" Journal of the American Ceramic Society, Vol. 64, No. 9, pp. 533-538 (1981). [5] A. G. Evans and E. A. Charles, "Fracture Toughness Determinations by Indentation" Journal of the American Ceramic Society, Vol. 59, No. 7-8, pp. 371-372 (1976).

Property Table:

Temperature = 23 C Grain Porosity Fracture Fracture Measurement Measurement Comments Size Toughness Energy Method Environment [m] [%] [MPam1/2] [J/m2] ------ -------- ------------ --------- ----------- ----------- -------------------------------- 7 AMDCB air Ref. 1; {10-10} plane; E=340 GPa -------------------------------------------------------------------------------------------------------- 4.54 CF air Ref. 2; KIC-plane (0001), direction [11-20] 3.14 CF KIC-plane (1-100), direction [0001] 2.38 CF KIC-plane (1-102), direction [11-20] 2.43 CF KIC-plane (1-120), direction [0001] -------------------------------------------------------------------------------------------------------- 7.3 DCB N2 Ref. 3; {10-10} plane 6.0 DCB {-1012} plane E=31 GPa; perpendicular to {10-10} plane -------------------------------------------------------------------------------------------------------- 1.89 ICS air Ref. 4; E=425 GPa 2.55 IS -------------------------------------------------------------------------------------------------------- 2.1 ICS dry N2 Ref. 5; Material hot-pressed with MgO; H = 23 GPa --------------------------------------------------------------------------------------------------------



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