● Introduction
Horizontal directional
solidification method can be used to synthetize polycrystals.
Directional solidification furnace is divided into 3 zones according to
the thermal.
Take gallium arsenide for example. Arsenic element will sublimate in low
temperature region (about 630 ℃), then through the medium temperature
region and form polycrystals in high temperature region with gallium
gradually. PBN boats act the reaction vessel in high temperature region.
● Characteristic
1. Our company can manufacture large size PBN boats (The maximum height can be 17 inches).
2. High density (It can reach to 2.19 g/cm3).
3. High purity (>99.99%).
4. High cracking resistance (Excellent coefficient of thermal expansion).
5. No deformation at high temperature (It can resist the high temperature of 2300℃ in vacuum)
6. Long service life time.
● Parameter
| property | unit | value | |
| density | g/cm3 | 2.0-2.19 | |
| microhardness (knoop)(ab side) | N/mm2 | 691.88 | |
| resistivity | Ω·cm | 3.11×1011 | |
| tensile strength（N∥C） | N/mm2 | 153.86 | |
| bend strength | (力|| “C”) | N/mm2 | 243.63 |
| (力⊥“C”) | N/mm2 | 197.76 | |
| elastic modulus | N/mm2 | 235690 | |
| thermo conductivity | W/m·k | “a” direction “c” direction | |
| (200℃) | W/m·k | 60 2.60 | |
| (900℃) | W/m·k | 43.70 2.80 | |
| dielectric strength（at room temperature） | KV/mm | 56 | |
● Application:
The product can be used to synthesize crystal, melt and evaporate metal. This PBN product is mainly used for the production of III-V single-crystal with horizontal directional solidification method.
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