Ceramics Products
PBN Coatings and Shapes
High-performance, high-temperature & ultra-pure
Pyrolytic Boron Nitride (pBN), with a combination of high electrical resistance and thermal conductivity, is an excellent candidate to consider for applications where superior strength, low coefficient of thermal expansion and thermal shock resistance are required. Nonhazardous, nonporous and exceptionally pure, pBN can be applied as a coating on graphite or deposited and then easily machined into 2D or 3D shapes for use as crucibles, boats, plates, wafers, tubes and bottles. Known for its directional thermal conductivity and ability to provide optimal heat spreading, pBN demonstrates improved temperature stability up to 1700°C, is resistant to thermal shock and when coated on graphite can protect against corrosive atmospheres including most molten metals (Al, Ag, Cu, Ga, Ge, Sn, etc.), acids and hot ammonia environments.
Features and Benefits
- Ultra-high purity and fully dense to deliver negligible outgassing and makes the pBN suitable for high-temperature UHV conditions
- Chemically inert to most gases and molten metals to allow use of pBN in high temperature process without concern of contamination and structural integrity
- One of the highest dielectric strengths known offers tremendous electric insulation for high-temperature applications
- Good thermal conductivity and toughness allow for excellent thermal shock resistance
- Balance of softness and toughness allows for machining of intricate features
Recognized as the global technology leader in engineered coating solutions, Momentive Technologies can provide our coating as a toll-coating or on a full-service basis as we have extensive graphite machining and measurement capability. Additionally, we have redundant production facilities in Japan and the USA, which provide our customers with the capacity to ramp with your markets, as well as a team of expert engineers to help you design the right solutions for you and your specific applications.
Typical PBN Physical Properties
|
Apparent Density (gm/cm3) |
1.95 – 2.22 |
|
|
Tensile Strength (MPa, psi) |
40, 6000 |
|
|
Flexural Strength (MPa, psi) |
80,12000 |
|
|
Thermal Conductivity (W /m·K) |
“ab” 60 |
|
|
|
“c” 2 |
|
|
CTE [mm/mm/°C] |
“ab”2xl0·6 |
|
|
Resistivity (ohm-cc) |
1015 |
|
|
Dielectric Strength (D.C. volts/mmc) |
2×105 |
|
|
Dielectric Constant |
“ab” 5.2 |
|
|
|
“c” 3.4 |
|
|
Total Metallic Impurities (ppm) |
10 |
|
|
Outgassing |
Negligible |
|
|
Maximum Suggested Use (°C) |
2500 |
|
Principal Bulk Impurities in PBN
| Impurity | ppm | |
|---|---|---|
|
Na |
<2 |
|
|
Al |
0.4 |
|
|
Si |
3 |
|
|
Ca |
3 |
|
|
Fe |
0.2 |
|
The information provided in these charts is for informational purposes only. It is not a product or material recommendation and it is shared with you on the express condition that you will use your own expertise and professional judgment in applying any information to a specific use case or need. This is general information only, the validity of which may be affected by individual factors that are unknown to Momentive Technologies. It is the responsibility of those using this information to ensure appropriate interpretation and application is undertaken with regards to any specific situation.
Potential Applications
- Compound semiconductor crystal growth, including GaAs and InP
- MBE & MOCVD equipment
- Metal evaporation and molten metal processing equipment, such as OLED electrodes and CIGS solar cell processing equipment
- Fixtures for active brazing and reaction sintering in reducing atmosphere
- Helix support rods for travelling wave tube application
