Ceramic Crucible---BN Crucible

Ceramic Crucible--BN Crucible Ceramic crucible for vaporization crucible of aluminum crucible good thermal shock. ISO90001

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

The Picture of boron nitride ceramic crucible:

The Show of our company:

  

ISO9001:2008