Wednesday, November 25, 2020

Saturday, November 14, 2020

HK 300mm Compressed Heater Chuck

HK 300mm Compressed Heater Chuck

 BACKGROUND

To reduce the overall cost for an existing application, BCE developed a 300mm aluminum heater chuck that is un-brazed utilizing the compression of two plates with countersink set screws. The heater surface specs were 0.003” flatness at a 0.005” parallelism. Using a 208-volt power supply at 9.7ohm, start @ 25°C temperature and ramped from 100°C to 465°C in 23 minutes. 

SCOPE

Aluminum Heater Chuck needed to satisfy the following:

  • Achieve temperature up to 435°C  @ +/- 2% or better 
  • Internal element must be able to withstand temperatures up to 600°C
  • Anodized surface for electrical isolation 
  • 208 Volt, 9.7 Ohm, 4,460 Watt (+5% / - 10%) 
  • Thermocouple bore hole to be placed at the center (variable) 
  • 4 point temperature profile on the top surface of the heater 
  • Used an infrared sensor for each 4 point locations
  • FINISH: Hard coat anodize per MIL-A-8625F, Type 3 Class1 Hard-coat thickness  

OUTCOME

BCE produced a highly effective high 300mm heater with exceptional uniformity better than the proposed 435°C (+/-2%).  After the initial ramp, the heater maintained 435°C (+/- 1%) as per the chart below (Temp profile #5). 

300mm heater chuck
BCE
510-274-1990

Wednesday, November 11, 2020

Molybdenum-Copper Stage Heater

Molybdenum-Copper Heater

BACKGROUND

A research and development company approached BCE wanting to heat a 1mm x 1mm x 0.5mm thick component. This was a very sensitive part that needed to be tested to a maximum exposure of 200°C continuous with very precise temperature uniformity for sampling purposes.

SCOPE

Molybdenum-Copper Stage Heater needed to satisfy the following:

  • Temperature <201°C
  • Internal element must be able to withstand temperature <210°C
  • A cold section was not needed
  • Molybdenum-Copper (Moly-Copper) base 65% Moly and 35% Copper
  • 12Volt, 3Watt (Max)
  • Two thermocouple type “K” external
  • M1 threads 

OUTCOME

BCE produced a highly effective assembly which reached the temperature of 200°C in under 1-Minute utilizing only 2.6 watts. Because of the low mass and high conductivity of the copper-moly base, reaching the target temperature and cooling down was highly efficient.

There were two thermocouples which were used to verify the test temperature. One was an exposed bare-bead TC 36 AWG, with the second TC being a 0.062”Ø probe style unit. The M1 threads were challenging, however our process was able to make this happen. 

GET MORE INFORMATION ABOUT THE CUSTOM MOLYBDENUM-COPPER HEATER HERE

Call BCE today for more information.
510-274-1990
https://bcemfg.com