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BN CrucibleWhite Boron Nitride Crucible---BN Crucible
suitable for the vaporization of aluminum, having a multi-walled structure comprising an outer wall and a thinner inner wall weakly bonded to the thicker outer wall. Because of this structure, the crucible is considerably more flexible than conventional single-walled crucibles and exhibits substantially improved thermal cycling characteristics and longer life. The crucible is produced by depositing pyrolytic boron nitride upon a mandrel having the shape of the desired crucible at a temperature of from about 1850° C. to about 2100° C. until a first layer of boron nitride of suitable thickness has been produced, interrupting the deposition of boron nitride upon the mandrel and lowering the temperature to below 1750° C., and then depositing additional boron nitride upon the mandrel at a temperature of from about 1850° C. to about 2100° C. to produce a second outer layer of boron nitride having a thickness greater than that of the inner layer.
The technical parameters:
Boron Nitride main technical parameters | |
Melting point/°C | 3000(disintegrate) |
Operating temperature/°C | 900~1000(atmosphere),2800(N2) |
Density/g.cm-3 | 2.27 |
Hardness(Moh’s) | 2 |
Thermal conductivity/W.m-3.K-1 | 46.75~50.24 |
Coefficient of thermal expansion/10-6 °C-1 | 7.5 |
Breakdown voltage/kV.m-1 | (3.0~4.0)×104 |
Dielectric constant(ε) | 4.0~4.3 |
Dielectric loss(tanδ)/10-4 | 2~8 |
Resistivity /Ω.m | >1012 |
Bending strength(RT) | >35mpa |
The compressive strength(RT) | >200mpa |
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ISO9001:2008
Ceramic Crucible---BN Crucible