Material Properties Of Boron Nitride

CBN is usually black, brown or dark red crystals with a zinc blende structure with good thermal conductivity. Hardness is second only to diamond, it is a super hard material, often used as tool materials and abrasives.

Boron nitride has chemical resistance properties and is not corroded by inorganic acids and water. The boron-nitrogen bond is broken in the hot concentrated alkali. Above 1200℃, it will start to oxidize in the air. The melting point is 3000°C, and it begins to sublimate when it is slightly lower than 3000°C. It begins to decompose at about 2700°C under vacuum. Slightly soluble in hot acid, insoluble in cold water, relative density 2.25. The compressive strength is 170MPa. The maximum operating temperature is 900°C in an oxidizing atmosphere, while it can reach 2800°C in an inactive reducing atmosphere, but the lubrication performance is poor at room temperature. Most of the properties of boron nitride are better than carbon materials. For hexagonal boron nitride: low friction coefficient, good high temperature stability, good thermal shock resistance, high strength, high thermal conductivity, low expansion coefficient, high electrical resistivity, corrosion resistance, microwave or transparent Infrared.