Pyrolytic Boron Nitride (PBN) Tube

With its high density and purity, PBN is becoming a widely used material in vacuum processes

SKU: PBN-T

Pyrolytic Boron Nitride Tube, PBN Tubes

Pyrolytic Boron Nitride (PBN) Tube and other pyrolytic boron nitride products are synthesized on the mold by chemical vapor deposition (CVD) process, with BCl3 and NH3 at high temperature and low pressure. PBN products are extremely pure, as the purity of gas material is easier to be controlled. Typically, PBN products have a total impurity of <100 ppm, which means the purity is no less than 99.99%. With such a high purity level, PBN Tubes are ideal products for semiconductor industries & vacuum systems.

With its high density and purity, PBN is becoming a widely used material in vacuum processes. The CVD process gives this pyrolytic boron nitride an almost perfect layered structure, which leads to anisotropic thermal conductivity, making it an ideal material to make components for furnace & vacuum systems.

Due to the CVD process, the wall thickness for PBN tubes is usually <2mm. The dimensions of raw PBN blank were limited by equipment, but the finished highly customized shape can be got from it at a competitive cost.

Pyrolytic Boron Nitride Specification

Item		Value		Unit
Lattice constant		a:2.504×10^-10		μ m
		c:6.692×10^-10
Density		2.0-2.19		g/cm3
Resistivity		3.11×10¹¹		Ω·cm
Tensile strength (ab)		153.86		N/mm2
Bend strength	c	243.63		N/mm2
	ab	197.76		N/mm2
Elastic modulus		235690		N/mm2
Thermo conductivity		“a” direction	“c” direction
	(200℃)	60	2.60	W/m·k
	(900℃)	43.70	2.80	W/m·k
Dielectric strength (at RT)		56		KV/mm

PBN Tube Applications

Pyrolytic Boron Nitride Tube from Boron Carbide Parts China Ceramics Division can withstand high temperatures in a high vacuum environment, it has excellent corrosion resistance and electrical resistance. Based on the above excellent properties, Boron Nitride Tube is an ideal choice in a wide range of industries, such as:

-Break rings for horizontal casting machine

-Insulators for high-temperature furnace

-Feedthrough for high voltage equipment

-Electric insulators in the vacuum system

-Boron Nitride components for PVD, MOCVD, MBE system.

-Nozzles for nonferrous metals metallurgy industry

-Spacers for glass melting

Packing

As a ceramic material, boron nitride is quite fragile in a lot of cases. Our Pyrolytic Boron Nitride Tube is carefully handled to minimize damage during storage and transportation. Suitable outer boxes and inner cushioning materials are used for PBN products, vacuum packing is also engaged for some of the parts.