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Alumina Coated Basket Heaters

Features

  • Developed to replace alumina crucibles for specific applications
  • Offer good heat transfer
  • Mostly inert in contact with hot metals
  • Evaporant metals do not wet alumina, resulting in the melt forming a "sphere" that acts as a point source
  • Heater resistance does not change throughout the deposition since evaporant does not touch the underlying heater material
  • Works well when thermally evaporating gold.

Because the alumina increases the thermal resistance between heater and evaporant, coated sources require 30–50% more power to achieve the same evaporation rate as an identical but uncoated basket heater. Another important difference is the thermal lag created by the alumina coating.

Any measurement of temperature in the region of the melt will not be the "equilibrium" temperature unless the power is raised very slowly. Typically, users do not have time for this slow rise and put excess power into the heater until the right evaporation rate is reached. Unfortunately, unless this excess power is then quickly reduced, the melt temperature will quickly rise above the optimum rate value.

NOTE: Coated heaters can have a longer usable life than non-coated sources when using care in handling and operation. The alumina is semiconductor grade and is applied by a plasma spray technique to a thickness of 0.005". The ends of the basket heater are unsprayed to allow successful connection to the power supply clamps. Coated baskets should not be used where the heater temperature must exceed 1475° C to achieve the required evaporation rate.

Don’t forget to order your evaporation materials.

Pellets/Pieces
Gold Pellets

Dimensional Drawings

Evaporation Sources FAQ
Click here for answers to some of the most common questions we are asked.
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Contact Us
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Ordering Table

Dim A
(in.)
Dim B
(in.)
Dim C
(in.)
Volt Amps Watts Temp. Part Number Price In Stock Add To
Cart
Dim A
(in.)
Dim B
(in.)
Dim C
(in.)
Volt Amps Watts Temp. Part Number Price In Stock Add To
Cart
0.420"
4"
0.575"
6.9
39
272
1475°C
EVBATTSPL1 $102.00 Call for Availability
0.150"
4"
0.375"
5.7
11
63
1475°C
EVBATTSPL2 $75.00 In Stock
0.500"
4"
0.925"
7
50
350
1475°C
EVBATTSPL3 $111.00 Call for Availability
0.790"
4"
0.875"
13
33
429
1475°C
EVBATTSPL4 $161.00 Call for Availability
0.900"
4"
1.125"
15.8
49
768
1475°C
EVBATTSPL5 $173.00 Call for Availability
0.375"
4"
0.500"
6.2
40
248
1475°C
EVBATTSPL6 $92.00 In Stock
Contact Us - Alumina Coated Basket Heaters