Hexagonal Boron Nitride (HBN) is a unique material that has a wide range of industrial applications. One common uses of this material are high-temperature nozzles in molten metal applications.
The use temperature of boron nitride ceramic crucible in a vacuum is 1800 degrees, and the use temperature under atmosphere protection is 2100 degrees. Nitrogen or argon atmosphere is the best and has the longest life. The boron nitride crucible is resistant to thermal shock, and will not crack when it is rapidly cooled at 1500 degrees. It will not crack if it is taken out of the furnace at 1000 degrees for 20 minutes and blow and quenched for hundreds of times.
Here are seven advantages of boron nitride nozzles:
1, Non-Clogging – Most molten metals do not wet HBN, resulting in nozzles that don’t clog and cause costly aborted runs.
2, Ultra-High Temperature Capability – Some Boron Nitride grades are good to 1800C in a vacuum and non-O2 atmospheres, far higher than current ceramic nozzles options.
3, Precise Parts – HBN is highly machinable which means it can easily be machined into intricate forms, including threads, fine holes, and sharp radii. Pieces can efficiently be machined to very tight tolerances meaning that every nozzle is the same, allowing the critical proper start to each atomizing run. The fine grain structure helps to prevent chips or cracks of typical ceramic nozzles.
4, No Preheating – It is almost impossible to thermal shock and HBN nozzle. This is a problem for typical alumina and zirconia grades used extensively today. This also means BN does not need to be preheated, resulting in time and energy savings.
5, Wear Resistant – Composite grades have excellent wear and corrosion resistance that are unmatched in pure HBN grades.
6, Customizable Properties – The thermal conductivity of HBN can be tailored by changing the grade used. From low (5 W/mK) to high (130+ W/mK), HBN offers a diverse range of properties that can be especially useful for metal freeze-off or pre-heating.
7, Easy Prototyping – Because HBN is machinable there are no tooling charges and small prototype runs can be made efficiently. This allows for easy development of different designs for different operating conditions.
INNOVACERA supply all shapes of ceramic nozzles, welcome inquiry.