Designer's Guide Results
The following is a list of materials, selected and ranked per your specification.

MaterialFlexural Strength
Fused Quartz / Silica> 160 kpsi
Zirconia-TZP130 - 150 kpsi
Zirconia Toughened Alumina (ZTA)100 - 145 kpsi
Sialon110 kpsi
Sapphire100 kpsi
Zirconia-PSZ100 kpsi
Silicon Nitride65 - 132 kpsi
Silicon Carbide Sintered59 - 108 kpsi
Silicon Carbide Reaction Bonded67 - 95 kpsi
CVD Silicon Carbide67 kpsi
Reference Materials
Diamondn/a
Stainless Steeln/a
Tool Steeln/a

All properties values are at room temperature unless otherwise noted. Engineering data are representative, and are not intended as absolute nor warrantable. Data shown is blended from multiple sources and therefore illustrates the marketplace. The relative rankings are approximate and are based on representative values if the particular material has a range of values for a given property.

Wikipedia Definition(s) :  Flexural Strength;

Check Different Properties