99.99% Pbn Pyrolytic Boron Nitride Tube, Crucible, Parts

Product Description

99.99% Pbn Pyrolytic Boron Nitride Tube, Crucible, Parts
Boron Nitride (BN) is a white, low porosity refractory material with physical and mechanical properties similar to Graphite. However, unlike Graphite, Boron Nitride has high thermal conductivity and good thermal shock performance. The most common formulation of Boron Nitride contains boric oxide, which can cause Boron Nitride to absorb moisture, resulting in swelling and property degradation.

 

It is produced in a hot pressed form and the resulting material properties are anisotropic relative to the press direction. In fact, the material properties can vary considerably depending on the direction or the grade of the material. Futhermore, it is easily machined into complex shapes using standard carbide tooling. The operation temperatures range from 900°C for oxidizing environments to 2200°C for inert environments.TECHNICAL PROPERTIES

Type	99BN	CBN	ABN	ZBN
Main Content	BN>99%	BN>98.5%	BN+AlN	BN+ZrO2
Binder	B2O3	CaB2O6	ALBO3	B2O3
Density    (g/cm3)	1.95-2.0	2.0-2.1	2.6	2.95
Flexural Strength    (Mpa)	30	100	200	200
Compressive Strength    (Mpa)	100	280	350	380
Electrical Resistivity    (ohm.cm)	>10^14	>10^13	>10^14	>10^12
Max. Working Temp.    (°C) air	900	900	900	1000
Max. Working Temp.    (°C) inert gas	2400	2400	2100	1800
Max. Working Temp.    (°C) vacuum	2200	2200	1900	1800
Thermal Conductivity    (W/m.K)	20	35	50	30
Expansion Coefficient  25 - 1000 °C (10^-6/K)	1.5	2	4.5	2.5