High Temperature Alumina Ceramic

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...