Fracture Toughness

The ability to resist fracture is a mechanical property of materials known as fracture toughness. For advanced ceramics it uses a critical stress intensity factor known as KIC where the fracture normally occurs at the crack terminations.

The length of the defect and an understanding of the ceramic materials Young’s modulus is needed to measure the KIC.

Fracture toughness is a critical metric as it determines how a material performs under given conditions. This is important as even in the highest quality ceramic its nearly impossible to guarantee that the end products are totally free from defects and therefore required to measure performance.

Fracture Toughness

Materials Ranked by Fracture Toughness

In terms of fracture toughness, Precision Ceramics CeramaZirc™ Ultra Tough is the clear winner outperforming regular Zirconia by 7 MPam1/2 – 17 MPam1/2 for CeramaZirc™ Ultra Tough vs. 10 MPam1/2 for Zirconia.
Zirconia CeramaZirc Ultra Tough Material Brand

Zirconia (ZrO2) - CeramaZirc™ Ultra Tough

17 MPam1/2
CeramaZirc Ultra Tough is an advanced zirconia-based ceramic composite material based on partially stabilized zirconia and alumina platelets.
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Silicon Nitride PCSN4000 Material Brand

Silicon Nitride (Si3N4) – CeramaSil-N™ PCSN4000

8.5 MPam1/2
Silicon Nitride has the most versatile combination of mechanical, thermal, and electrical properties of any advanced ceramic material.
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Zirconia CeramaZirc 3YZ Material Brand

Zirconia (ZrO2) - CeramaZirc™ 3YZ

8 MPam1/2
Unlike traditional ceramics that tend to be hard and brittle, Zirconia offers high strength, wear resistance, and flexibility far beyond those of most other advanced ceramics.
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Zirconia CeramaZirc Nano HIP Material Brand

Zirconia (ZrO2) - CeramaZirc™ Nano HIP

8 MPam1/2
Unlike traditional ceramics that tend to be hard and brittle, Zirconia offers high strength, wear resistance, and flexibility far beyond those of most other advanced ceramics.
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Alumina Toughened Zirconia - CeramAlloy

Alumina-Zirconia (ATZ) - CeramAlloy™ ATZ

8 MPam1/2
Alumina-Zirconia (ATZ) exhibits a combination of high hardness, strength, wear and corrosion resistance characteristic while maintaining reasonably high fracture toughness. 
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CeramAlloy Ultra Hard Material Brand

Zirconia-Alumina (ZTA) – CeramAlloy™ Ultra Hard

7 MPa1/2
Zirconia-Alumina (ZTA) exhibit a combination of high hardness, strength, wear and corrosion resistance while still maintaining reasonably high fracture toughness.
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Ceramic Material Comparison Chart

Created with Highcharts 4.2.0[MPa]Compressive StrengthSilicon CarbideSilicon NitrideAluminum NitrideBoron NitrideAlumina 99.5%ZirconiaMacorShapalCeramAlloy Ultra HardCeramAlox Ultra PureCeramaZirc Ultra Tough0500100015002000250030003500CeramaZirc Ultra Tough Compressive Strength: 2000 [MPa]Highcharts.com

Related Properties

Compressive Strength

Compressive strength is the capacity of a material to withstand loads tending to reduce size. Explained differently, compressive strength resists compression (being pushed together), whereas tensile strength resists tension (being pulled apart).

Fracture Toughness

Fracture Toughness

The ability to resist fracture is a mechanical property of materials known as fracture toughness. For advanced ceramics it uses a critical stress intensity factor known as KIC where the fracture normally occurs at the crack terminations.

Flexural Strength

Flexural Strength

Flexural strength, also known as bending strength, modulus of rupture or transverse rupture strength, is defined as the maximum stress in a material just before it yields in a bending test