High Purity BN Boron Nitride Setter Plate for Sintering Silicon Nitride Substrate

Properties of Hot Pressed Hexagonal Boron Nitride BN:

Low density	Excellent Machinability
Good chemical inertness	High electrical resistivity
High thermal conductivity	High temperature material
Excellent thermal shock resistance	Excellent lubricating properties
High dielectric breakdown strength	Non-wetted by molten metal & glass

With all the properties, boron nitride setter plate/ boron nitride box is a perfect choice for firing/ sintering Silicon Nitride(Si3N4) substrate and Aluminum Nitride(AlN) substrate.

Applications of Hot Pressed Hexagonal Boron Nitride BN:

CVD crucibles	Microwave tubes
Low friction seals	Sputtering targets
Plasma arc insulators	Microcircuit packaging
Vacuum melting crucibles	Horizontal continuous casting break rings
High temperature furnace fixtures and supports	High precision sealing, brazing, and metallizing fixtures
Boron doping wafers in silicon semiconductor processing	Electronic parts(heat sink, substrate, coil form, prototype)

More Information About Boron Nitride

Hexagonal Boron Nitride (white graphite) is a loose, lubricating, moisture-absorbing white powder with density 2.27/cm3, Mohs hardness 2, and low mechanical strength, but higher than graphite. No obvious melting point, sublimate at 3000℃ in 0.1Mpa nitrogen atmosphere. The operating temperature in nitrogen or argon is 2000°C. And in oxygen atmosphere, stability is poor, operating temperature is below 1000°C.

Hexagonal Boron Nitride has low expansion coefficient and high thermal conductivity, so it has excellent thermal shock resistance, and it will not be damaged even after hundreds of times of cycle use at 1200-20°C. The expansion coefficient of BN is equivalent to that of quartz, but the thermal conductivity is 10 times that of quartz.

Hexagonal Boron Nitride is a good conductor of heat and a typical electrical insulator. The resistivity at room temperature can reach 1016~1018. Even at 1000℃, the resistivity is still 104~106Ω.cm. The dielectric constant of BN is 3~5, the dielectric loss is (2~8) *10-4, and the breakdown strength is twice that of Al2O3, reaching 30~40 Kv/mm. Hexagonal Boron Nitride has good lubricity and resistance oxidation, corrosion resistance, insulation, thermal conductivity and chemical stability. It can be used to make TiB2/BN composite ceramics, it can also be used for advanced refractory materials and super hard materials, break rings for horizontal continuous rolling steel, for high temperature resistant lubricants and high temperature coatings, and it is also the raw material for the synthesis of cubic boron nitride.

Hexagonal Boron Nitride has excellent chemical stability. It has neither wetting nor effect on most metal melts, such as steel, stainless steel, Al, Fe, Ge, Bi, Si, Cu, Sb, Sn, In, Cd, Ni, Zn, etc. Therefore, it can be used as a high-temperature galvanic couple protection cover, melting metal crucibles, utensils, pipes for conveying liquid metal, pump parts, cast steel abrasive tools and high-temperature electrical insulation materials. Using the heat and corrosion resistance of BN, high-temperature components, rocket combustion chamber linings, thermal shielding of spacecraft, and corrosion-resistant parts of magnetic flow generators can be manufactured.