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Patented Q-COAT® FLASH EVAPORATORS represent a new generation of technology for the flash metallization market. They are constructed by coating a graphite (G) resistive element with a layer of ultra high purity pyrolytic boron nitride (PBN) and are engineered to be the most electrically consistent and chemically stable aluminum evaporators available. Since PBN maintains its high electrical resistivity and resistance to corrosive attack by aluminum, even at extreme temperature, the aluminum remains completely isolated from the control circuit and the resulting power curve is amazingly stable and repeatable. These PBN/Graphite (PBN/G) evaporators are also designed to directly substitute for ceramic evaporators in existing equipment.

Performance Features:

Ultra Pure
No Outgassing
Repeatable Power Curve
Very Long Life (Thousands of Flashes)
Direct Substitute for Ceramic Elements
Less Down Time
Reduces Rework
Cost Effective
More Consistent Al Quality & Thickness

Chemical isolation and electrical insulation of the aluminum from the graphite resistive element for PBN/G evaporators permit electrical resistance stability and consistency throughout their long life. This guarantees absolute flash-to-flash temperature repeatability, total aluminum evaporation and thickness (Q-value) consistency of the deposited

layer.Typical Material Properties:

Property	Graphite Substrate	PBN/Barrier
Density	1.75g/cc	2.15g/cc
Permeability	1.3 in²/sec	2.0 x 10^-11 in²/sec \|\|c
Modulus of Elasticity	1050 kg/mm²1.5 x 10⁶ psi	2100 kg/mm²3.0 x 10⁶ psi \|\|a
Flexural Strength	3.06 kg/mm²4350 psi	8.44 kg/mm²12000 psi \|\|a
CTE 1100°C to 2000°F	\3.9 x 10^-6°C 7.0 x 10^-6°F	2.6 x 10^-6 °C 4.7 x 10^-6°F \|\|a
Specific Heat	0.30 cal/gm-C 0.30 BTU/lb-F	0.24 cal/gm,-C 0.24 BTU/lb-F
Thermal Conductivity RT	0.24 cal/sec-cm-°C	0.15 cal/sec-cm-°C
Spec. Resistance RT 1500°C	1.3 X 10^-6 ohm-cm 0.6 X 10^-6 ohm-cm	10¹⁵ ohm-cm 10⁶ ohm-cm

Typical Power Curve for: PBN/GRAPHITE