Pyrolytic Boron Nitride LEC Crucible

typical thickness is 0.8~1.5mm

SKU: PBN-LECC

Pyrolytic Boron Nitride LEC Crucible, PBN Ceramic LEC Crucibles

The Pyrolytic Boron Nitride LEC crucible is a simple cylindrical crucible used in LEC (liquid-sealed Czochralski) crystal growth facilities. The LEC method is the main process for growing undoped semi-insulating gallium arsenide single crystals (SI GaAs). Currently, more than 80% of semi-insulating gallium arsenide single crystals on the market are grown using the LEC method. The LEC method uses a graphite heater and a PBN crucible, with B2O3 as a liquid sealant, to grow gallium arsenide crystals in an argon environment of 2MPa. The main advantages of the LEC process are high reliability, easy growth of long large-diameter single crystals, controllable crystal carbon content, and good semi-insulating properties of the crystal. The liquid-sealed Czochralski (LEC) technology can grow high-purity, undoped semi-insulating single crystals or polycrystals suitable for direct ion implantation. PBN has high density and high purity and is becoming a widely used material in vacuum processes. The CVD process gives this pyrolytic boron nitride a nearly perfect layered structure, resulting in anisotropic thermal conductivity, making it an ideal material for making crystal growth crucibles.

EDGETECH provides custom PBN crucibles, such as VGF / LEC / Conical / MBE / OLED, and PBN Boats.

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
thermal 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

Specification of PBN LEC Crucible

Item	Inside Diameter	Height	Thickness
LEC-C1	3″	3″	0.03″
LEC-C2	4″	4″	0.035″
LEC-C3	5″	5″	0.035″
LEC-C4	6″	6″	0.04″
LEC-C5	7″	7″	0.04″
LEC-C6	8″	8″	0.04″
LEC-C7	14″	14″	0.08″

Features

-Purity up to 99.995%
-No wetting with molten metal
-Controllable thermal conductivity, effectively improving crystallization rate
-Extremely low outgassing rate at high temperature
-Uniform thickness, good heating consistency
-Excellent thermal conductivity and thermal shock resistance
-Easy to clean and reuse
-Chemically inert, no chemical reaction with acid and alkali at high temperature

Packing

Boron nitride is quite fragile as a ceramic material. Pyrolytic Boron Nitride LEC crucibles are usually held in plastic bags under vacuum and protected with heavy foam.