Pyrolytic Boron Nitride Rings (PBN Rings)
With its high density and purity, PBN is becoming a widely used material in vacuum processes
Pyrolytic Boron Nitride Rings, PBN Ceramic Ring
Pyrolytic Boron Nitride ring is synthesized on a mold using a chemical vapor deposition (CVD) process. PBN products are very pure because the purity of gas materials is easier to control. Typically, the total impurity content of PBN products is less than 100 ppm, which means the purity is no less than 99.99%. With such high purity, PBN rings are ideal products for the semiconductor industry and vacuum systems. In addition, because PBN is easy to process, it can be processed into plate-like parts of various shapes and used as insulating pads and other structural parts in the fields of high temperature, vacuum, MBE, and MO CVD.
Due to its high density and purity, PBN is becoming a widely used material in vacuum processes. The CVD process gives this pyrolytic boron nitride a nearly perfect layered structure, resulting in anisotropic thermal conductivity, making it an ideal material for manufacturing furnaces and vacuum system components.
Pyrolytic Boron Nitride Specification
| Item | Value | Unit | ||
| Lattice constant | a: 2.504×10-10 | μ m | ||
| c: 6.692×10-10 | ||||
| Density | 2.0-2.19 | g/cm3 | ||
| Resistivity | 3.11×1011 | Ω·cm | ||
| Tensile strength (ab) | 153.86 | N/mm2 | ||
| Bend strength | c | 243.63 | N/mm2 | |
| ab | 197.76 | N/mm2 | ||
| Elastic modulus | 235690 | N/mm2 | ||
| Thermo conductivity | “a” direction | “c” direction | ||
| (200℃) | 60 | 2.6 | W/m·k | |
| (900℃) | 43.7 | 2.8 | W/m·k | |
| Dielectric strength (at RT) | 56 | KV/mm | ||
Characteristics of PBN Ceramics
-Purity up to 99.999%
-Good thickness uniformity
-High resistivity, good insulation
-Extremely low outgassing rate at high temperatures
-High strength, not easy to deform at high temperatures
-Chemically inert, no chemical reaction with acids or alkalis at high temperatures
Packing
As a ceramic material, boron nitride is quite fragile in many cases. The Pyrolytic Boron Nitride Rings are usually held in plastic bags by vacuum, and protected with heavy foam.
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