Boron Nitride Ceramic

Boron nitride tubes made of hot pressed boron nitride ceramics have good electrical insulation, the breakdown voltage is about 3-4 times of alumina ceramic. Therefore, boron nitride tubes could be used as good insulators. By the way, boron nitride tubes also have high temperature resistance and good thermal shock resistance, they can work up to 2100 ℃ under atmosphere protection and 1900 ℃ under vaccum, cracks will not happen even when big temperature changes happen. Boron nitride tubes have low hardness and cannot be used in wear resistance jobs or applications with strong force impact.

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PBN ceramic (pyrolytic boron nitride, pyrolytic BN) is a kind of advanced ceramic, can be produced with 99.999% purity by the forming method of chemical vapour deposition (CVD), no need to go through the traditional hot pressing sintering process. PBN ceramic has high purity, chemical inertness, thermal stability, low outgassing, non-wetting characteristics, and long lifetime, it is the ideal material for furnace, electrical, microwave, and semiconductor components.

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Boron nitride nozzles made of hot pressed boron nitride ceramics have outstanding thermal shock resistance, crack or break will not happen when boron nitride nozzles undergo sudden heating or cooling. The ceramic nozzles have good temperature resistance up to 2100℃ (under inert gas protection). Boron nitride ceramic nozzles are widely applied for metal powder gas atomization because they have no reaction or wetting with molten metals.

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ZSBN ceramic is one type of hot pressed boron nitride ceramic, it is a composite material that combines the excellent properties of hot pressed boron nitride and zirconia. ZSBN ceramic not only has the excellent thermal stability and non-wetting property of hot pressed boron nitride, but also has good wear resistance and high strength of zirconia. ZSBN ceramic has perfectly overcome the defect of pure boron nitride ceramic, making it able to be used for applications where good thermal shock resistance, non-wetting property and good wear resistance are needed. ZSBN ceramic is widely applied for molten metal applications such as continuous casting breakrings, metal powder atomizing nozzles, and nozzle for amorphous soft magnetic etc.

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Pyrolytic boron nitride is also called as PBN or Pyrolytic BN, it is an advanced ceramic material with excellent properties. It also has hexagonal crystal structure like hot pressed boron nitride ceramic, but is produced in different manufacturing process. PBN ceramic is produced by the method of chemical vapour deposition (CVD), no need to go through the traditional hot pressing sintering process, without adding any sintering agent, the purity is able to reach 99.99%.

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Boron nitride plates are manufactured using hexagonal boron nitride (HBN) powder, which is then processed through high-temperature vacuum hot-pressing sintering. These plates have exceptional resistance to high temperatures, extremely stable chemical properties, high electrical insulation properties, and strong resistance to acidic corrosion. The unique quality of boron nitride plates is their non-wetting characteristic with most molten metals, making them suitable for producing ceramic nozzles or crucibles for metal smelting operations. Compared to alumina ceramic or zirconia ceramic, boron nitride plates have low hardness and excellent machinability, which allows for easy machining using standard metal working tools.

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