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Ceramisis Ltd
29, Harley Street,
London,
W1G 9QR,
England
Tel:44(0)20 7927 6710
Fax:44(0)20 7637 0419
sales@ceramisis.com
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In
vacuum substrate heating
•
Vacuum & high temperature materials
• Vacuum
furnace insulation |
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> Pyrolytic Boron Nitride Crucibles (PBN Crucibles).
Pyrolytic Boron Nitride (PBN) is opaque white, non-toxic,
non-porous, electrically insulating, easily machined, with very
good resistance to thermal shock. Our
Pyrolytic Boron Nitride crucibles (PBN crucibles) are always
manufactured to our customer's specific requirements on shape
and size, we do not stock any crucibles. The maximum size of our
pyrolytic boron nitride crucibles (PBN crucibles) we can
manufacture is diameter 330mm x height 500mm x 1.0mm wall
thickness. Lead times are generally 4-6 weeks from receipt of
official order. All crucibles are fully cleaned before packaging
and shipping.
In addition to Pyrolytic Boron Nitride crucibles (PBN crucibles)
we can also produce PBN tubes, PBN plate (max 4mm thick) and
bespoke PBN components.
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General Properties
|
Apparent
Density |
g/cc |
2.15 - 2.19
(crucible) |
2.10 - 2.15
(sheet) |
|
Gas
permeability (He) |
cc/s |
<1 x 10e-10 |
|
Micro hardness
(Knoop) |
N/mm² |
691.88 (a-b
plane) |
|
Tensile
strength |
N/mm² |
153.86
(parallel) |
|
|
Bending
strength |
N/mm² |
243.63
(parallel) |
197.76
(perpendicular) |
|
Modulus of
elasticity |
N/mm² |
235690 |
|
Specific heat
capacity |
cal/g.°C |
0.371 (@ 200°C) |
0.442 (@ 900°C) |
|
Thermal
conductivity 200°C |
W/cm.k |
0.6 (parallel) |
0.026
(perpendicular) |
|
Thermal
conductivity 900°C |
W/cm.k |
0.4370
(parallel) |
0.028
(perpendicular) |
|
Dielectric
strength (RT) |
KV/mm |
56 |
|
Volume
resistivity |
Ω.cm |
3.11 x 10e13 |
Chemical
Properties
Pyrolytic Boron Nitride is non-toxic and inert to almost all
reagents (acids, bases, salts, organic reagents) at room
temperature. Pyrolytic Boron Nitride does not react with most
metals, semiconductors and compounds. No oxidation <1000°C,
detectable weight loss at 1250°C,
purity is 99.99% minimum.
Ion
Mass spectrum analysis results for impurity:
|
Element |
Content |
Element |
Content |
Element |
Content |
Element |
Content |
|
F |
1.5 x 10e-6 |
Na |
1.7 x 10e-6 |
Mg |
5.8 x 10e-6 |
Al |
1.9 x 10e-5 |
|
Si |
5.4 x 10e-5 |
P |
2.2 x 10e-5 |
S |
3.1 x 10e-5 |
Cl |
|
|
K |
3.0 x 10e-6 |
Ca |
3.3 x 10e-7 |
Ti |
5.2 x 10e-6 |
V |
3.7 x 10e-6 |
|
Cr |
1.5 x 10e-6 |
Mn |
4.4 x 10e-7 |
Fe |
7.7 x 10e-6 |
Co |
4.7 x 10e-8 |
|
Ni |
2.1 x 10e-6 |
Cu |
7.4 x 10e-7 |
Zn |
1.1 x 10e-6 |
Ga |
2.8 x 10e-7 |
|
Ge |
|
As |
3.4 x 10e-7 |
Se |
1.3 x 10e-7 |
Zr |
1.4 x 10e-6 |
|
Nb |
|
Mo |
9.7 x 10e-7 |
In |
|
Sb |
8.7 x 10e-7 |
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W |
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