Hardness
Hardness
One of the most valuable characteristics of advanced ceramics in high-performance applications is their extreme hardness. Ultra Hard ceramic materials have been utilised to enhance the performance of ballistic armour , where many grades are used in multiple applications from body amour to vehicle and helicopter armour . The use of wear parts to replace steel components in pumps , motor vehicles and valves has increased extending component lifetimes.
There are two materials which are only surpassed by diamond in terms of hardness – Boron Carbide (B4C) and Silicon Carbide (SiC). Precision Ceramics DuraWear™ a Boron Carbide based composite ceramics and Durashock™ a Boron Carbide/Silicon Carbide ceramic composite are extremely hard and only available at Precision Ceramics.
Materials Ranked by Hardness
In terms of hardness, between DuraWear™ and Durashock™ there’s not much to choose between them but each has its own specific advantages in terms of properties and applications. This is followed by Silicon Carbide (SiC), one of the lightest, hardest and strongest advanced ceramics.
Boron Carbide / Silicon Carbide (B4C+SiC)
31 GPa
DuraWear™ is a Boron Carbide / Silicon Carbide hard ceramic composite for abrasive wear protection. With a high intrinsic hardness for applications where abrasive wear is an issue.
Silicon Carbide / Boron Carbide (SiC+B4C) - DuraShock™
28 GPa
DuraShock™ is a Silicon Carbide / Boron Carbide tough and hard lightweight ceramic composites for ballistic protection applications.
Zirconia-Alumina (ZTA) – CeramAlloy™ Ultra Hard
21.5 GPa
Zirconia-Alumina (ZTA) exhibit a combination of high hardness, strength, wear and corrosion resistance while still maintaining reasonably high fracture toughness.
Alumina (Al2O3) – CeramAlox™ Ultra Pure
19 GPa
CeramaAlox Ultra Pure is a very high purity (99.95%) grade of Alumina (Aluminum Oxide) exhibiting an exceptional combination of mechanical and electrical properties.
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.