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.
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.
Materials Ranked by Fracture Toughness
In terms of fracture toughness, Precision Ceramics CeramaZirc™ Ultra Tough is the clear winner outperforming regular Zirconia by 7 MPa m1/2 – 17 MPa m1/2 for CeramaZirc™ Ultra Tough vs. 10 MPa m1/2 for Zirconia
Zirconia (ZrO2) - CeramaZirc™ Ultra Tough
17 MPa m1/2
CeramaZirc Ultra Tough is an exceptional advanced zirconia-based ceramic composite based on partially stabilized zirconia and alumina platelets. Developed initially for the oil and gas market, this material exhibits a strong combination of properties making it the most fracture tough ceramic we have ever developed.
Silicon Nitride (Si3N4) – CeramaSil-N™ PCSN4000
8.5 MPa m1/2
Silicon Nitride has the most versatile combination of mechanical, thermal, and electrical properties of any advanced ceramic material.
Zirconia (ZrO2) - CeramaZirc™ Nano HIP
8 MPa m1/2
A hipped material made using nano grade powder, Zirconia offers high strength, wear resistance, and flexibility far beyond those of most other advanced ceramics.
Alumina-Zirconia (ATZ) - CeramAlloy™ ATZ
8 MPa m1/2
Alumina-Zirconia (ATZ) exhibits a combination of high hardness, strength, wear and corrosion resistance characteristic while maintaining reasonably high fracture toughness.
Related Properties
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.
Density
Density is the mass of a material per unit volume. The unit of measurement can be expressed in different ways and is referred us as g/cm3 but another measurement value is kg/m3.
Hardness
One of the most valuable characteristics of advanced ceramics in high-performance applications is their extreme hardness. Hard ceramic materials are used for a wide range of applications in diverse fields and applications such as cutting tools for milling and grinding.