LUXEL CORPORATION
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Features of Models Radak I and Radak IIAccurately controlled temperatures to 1500°C
Optical, Electronic, and Functional Thin Film Coating ApplicationsUse RADAK furnaces for conventional or flash evaporation of dielectric, semiconductor and metallic materials.
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Height |
2.50" |
Diameter |
1.75" |
Standard Crucible |
2 cc high purity alumina |
Charge Capacity |
1 cc |
Temperature Range |
0° to 1500°C |
Thermocouple |
Type C or Type K* |
RADAK II 
Medium size work horse for high temperature general purpose applications.
Height |
4.00" |
Diameter |
2.25" |
Standard Crucible |
15 cc high purity alumina |
Charge Capacity |
10 cc |
Temperature Range |
0° to 1500°C |
Thermocouple |
Type C or Type K* |
* Type K not recommended above 1200°C
 | Twist-lock cover offers easy access to
crucible and furnace interior Single-bolt mount, power, and thermocouple terminals are located on furnace base in order to keep cover free for easy access |
| Crucible support is spring mounted to provide a tight seal between the crucible and vapor shield and cover assembly |
| Concentrated filament windings near top of crucible to reduce crucible "choking" |
| Sealed radiation baffling minimizes heat loss and power requirements |
| Stainless Steel and Molybdenum external cover and base |
| Tantalum, Nickel, and Molybdenum internal structures and baffle |
| Tungsten resistive filaments |
| High purity alumina filament supports and feedthroughs |
click for larger images
Type C (Tungsten-Rhenium)
| Superior for applications between 1200°C and 1500°C, and for routine applications up to 1200°C |
Type K (Chromel-Alumel)
| Extra sensitive |
| For routine applications up to 1200°C |
* Type K not recommended above 1200°C
(An alumina or quartz crucible, your choice, is included with each new furnace.)
| High Purity Alumina |
| Quartz |
| Pyrolytic Boron Nitride (PBN) |
All crucibles are high purity material and have a precision ground lip to provide a vapor seal, which prevents contamination of the radiation baffles.
The high purity (99.9% pure) PBN crucibles have a nominal 2% taper over their length and are available in double wall construction, which is useful in the evaporation of materials that wet the PBN at high temperatures. The inner wall will flex as the material expands and contracts during evaporation. The eventual fracture of the inner wall will allow the material to wet the interface. This will serve as a visual warning to remove the crucible from service before the outer containment wall also fractures, which would result in furnace damage.
| Inconel |
| Molybdenum |
| Nickel |
| Solid Tantalum |
| Spot-welded Tantalum |
| Tungsten |
Some applications may require the use of an insert—a shorter crucible placed inside a standard crucible. Such applications include evaporating materials that would react with the standard crucible material, and evaporating materials that have a higher thermal coefficient of expansion than the crucible material. For example, the re-use of a crucible containing a slug of copper often results in crucible fracture and subsequent furnace damage. The use of an "expandable" insert contains the molten material within the standard crucible, protecting the furnace.
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NOTICE:
Luxel has and will remain the premier re-builder of
all our RADAK furnaces and power controllers. However, Luxel realizes
the safety and health of our employees is of prime importance.
Therefore, on all future shipments to Luxel, we now require a Declaration of
Contamination form be filled out listing all materials that the furnace
was exposed to.
Please
download the
Declaration of Contamination PDF form here, print and fill it out and include the form with your
shipment.
Non-completion will result in a delay in your order. Thank
you for your cooperation.
You can download the latest
Adobe Acrobat PDF reader here.....
04/25/2006
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