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Hardness of ceramics – DIN EN 843-4 / ISO 14705

Normative References  

DIN EN 843-4: Advanced technical ceramics– Mechanical properties of monolithic ceramics at room temperature–Part 4: Vickers, Knoop and Rockwell superficial hardness

ISO 14705: Fine ceramics (advanced ceramics, advanced technical ceramics) -- Test method for hardness of monolithic ceramics at room temperature

EN 843-4 provides three test methods to determine the hardness of ceramic materials: Vickers, Knoop and Rockwell. All three methods use an indenter to apply localized plastic deformation. The point of indentation is measured and hardness values are calculated. Due to the brittle behavior of ceramic materials, an experienced user of the standard is needed to obtain reliable results.