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Technical Ceramics

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Boron Nitride Ceramic Nozzle For Metal Powder Gas Atomization

BN-2300, one of hexagonal boron nitride based composite, is an ideal materials for an atomizer nozzle, thanks to its high strength, high melting point, high toughness, outstanding thermal shock resistance, excellent machinability and low-friction properties. BN-2300 nozzles for the atomizing process can ensure a continuous flow with no blockage or breakage happening at that level.

  • Density :

    2.25 - 2.35 g/cm3
  • Max. Service Temp. :

    1,000 - 1,750 degree C
  • Thermal Conductivity :

    30 W/m.K
  • Main Application :

    Metal Powder Gas Atomization
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Product Detail

▼ Feuatures of Boron Nitride Nozzles

  Excellent Machinability
  Good Chemical Inertness
  High Temperature Material
  Non-wetted by Molten Metal
  Excellent Lubricating Properties      
  Excellent Thermal Shock Resistance


▼ Molten Metal Gas Atomization

Gas atomization technology for molten metal processing is a process that is used to fabricate powders of metals from their melt. In a typical atomizer, the liquid metal is poured down a nozzle into a large chamber while being simultaneously sprayed on by high-pressure jets of gas. This causes the metal droplets to separate and condense into a powder, which collects at the bottom. Gas atomization has established itself as one of the most popular means for powdering metals. In turn, these powders are crucial to 3D printing metallic parts and in the industrial production of certain compounds that cannot be made any other way. UNIPRETEC is the expert of producing suitable nozzles for the gas atomising of metal powders.


Metal Powder Gas Atomization


▼ Boron Nitride Material for Gas Atomization Nozzles

BN-2300, one of hexagonal boron nitride based composite, has come to be recognized as an exceptional nozzle material as it satisfies all these conditions. 


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

Under high vacuum, boron nitride can survive 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.  


▼ Properties of Boron Nitride Nozzles

 ITEM  UNIT  VALUE
 Main Content
 -  h-BN + Al2O3 + ZrO2
 Density
 g/cm3
 2.25 - 2.35
 Binder
 -  Boric Oxide
 Color
 -  Light Grey
 Compressive Strength (25 °C)
 Mpa
 145
 Flexural Strength (25 °C)
 Mpa
 65
 Thermal Conductivity (25 °C)
 W/m.K
 30
 Thermal Expansion Coefficient (25-1,000 °C)
 10-6/K
 2.0
 Max. Use Temp. (Air Environment)
 °C
 1,000
 Max. Use Temp. (Vacuum Environment)
 °C
 1,750
 Max. Use Temp. (Inert Environment)
 °C
 1,900
 Electrical Resistivity (25 °C)
 Ω·cm
 >1013
∆ The data is offered for reference only, exact data will vary depending on producing method & part configuration.

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