Here's why:

* Ceramic Materials: Ceramics are inorganic, non-metallic solids that are typically formed by high-temperature processing. They are known for their hardness, high melting point, and excellent resistance to wear and corrosion.

* Boron Nitride (BN): This is a compound of boron and nitrogen. It exists in several crystalline forms, including hexagonal boron nitride (h-BN) which is similar in structure to graphite and is known for its excellent thermal conductivity, lubricity, and electrical insulation.

* Aluminum Oxide (Al2O3): This is a compound of aluminum and oxygen. It is commonly known as alumina and is a very hard, strong, and chemically inert material. It is widely used in ceramics, abrasives, and refractories.

Both boron nitride and aluminum oxide possess the characteristic properties of ceramics, making them useful for various applications.