What is the toughest ceramic?
May 19, 2026
Generally, the "toughest ceramics" we discuss fall into several categories. If we only consider natural materials,B4C Boron Carbide is widely recognized as one of the hardest ceramics. If we broadly define it to include synthetic materials, then cubic boron nitride (CBN) and diamond-coated ceramics are much harder.
To more intuitively understand their differences, here is a hardness ranking of these "hardcore contenders":
Hardness Level
Material Name
Typical Vickers Hardness (HV)
Mohs Hardness
Core Features and Applications
Crown
Diamond-coated ceramics
~ 10,000
10
It is a diamond film grown on a ceramic substrate using CVD technology. Pure diamond has a hardness of approximately 10,000 HV, but because its natural formation process does not strictly fall under the category...
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