INNOVACERA

technical ceramic solutions

Boron Nitride Nozzles for Atomizers

Boron Nitride nozzle for gas atomization

INNOVACERA has seven grades of Boron Nitride. BN99, BN+ZrO2, and BN+Zr+AL are often used for processing steels and nickel alloys. Usually, the material is machined as a nozzle used for powder metallurgy.

Grade BN997 BN99 BN-SI BN-AL BN-SIC BN-ZR BN-ALN
Main Composition BN>99.7% BN>99% BN+AL+SI BN+ZR+AL BN+SIC BN+ZRO2 BN+ALN
Bonding Composition B2O3 B2O3 Boron oxide silicon Boron oxide aluminum Boron oxide aluminum B2O3 Boron oxide aluminum
Density (g/cm3) 1.6 2 2.2-2.3 2.25-2.35 2.4-2.5 2.8-2.9 2.8-2.9
Room Temperature Electric Resistivity (Ω·cm) >1014 >1014 >1013 >1013 >1012 >1012 >1013
Max Using Temperature (°C)
In Atmosphere
In Inactive Gas
In High Vacuum (Long Time)
900
2100
1800
900
2100
1800
900
1750
1750
900
1750
1750
900
1800
1800
900
1800
1800
900
1750
1750
Remark: The value is just for review, different using conditions will have a little difference.

BN+ZrO2, one of the composite boron nitrides, has come to be recognized as an exceptional nozzle material as it satisfies all these conditions.

It is an advanced ceramic material with a high melting point, is tough enough to prevent cracks, has high thermal shock resistance, and is easy to machine. In addition, molten metals won’t wet the surface of boron nitride, which means that it is not easily clogged during the atomization process.

Under a high vacuum, boron nitride can resist up to 1,750 °C. A gas atmosphere can push this even further to 1,900 °C. This means that boron nitride will remain solid through the melting of most metals. Boron nitride has a very low thermal expansion. Together with the high heat conductivity, this ensures that the material has very high shock resistance. It can easily withstand the rapid gradations in temperature inside the atomizer. It does not break or crack under thermal stresses.

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