Effect of electropolishing on vacuum furnace design

  • Sutanwi Lahiri Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, India
  • Girish Kumar Sahu
  • Biswaranjan Dikshit Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, India
  • Radhelal Bhardwaj Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, India
  • Ashwini Dixit Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, India
  • Ranjna Kalra Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, India
  • Kiran Thakur Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, India
  • Kamalesh Dasgupta Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, India
  • Asoka Kumar Das Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, India
  • Lalit Mohan Gantayet Beam Technology Development Group, Bhabha Atomic Research Centre, Mumbai-400085, India
Keywords: Thermal shields, etching, emissivity

Abstract

The use of thermal shields of materials having low emissivity in vacuum furnaces is well-known. However, the surface condition of the heat shields is one of the most important factors governing their efficiency as radiation resistances. The emissivity of the thermal shields dictates the power rating of the heaters in furnace design. The unpolished materials used in the heater tests showed poor performance leading to loss of a signi­ficant percentage of the input power. The present work deals with the refur­bishment of the radiation heat shields used in a furnace for heating graphite structure. The effect of refurbishment of the heat shields by the buffing and subsequently electro­polishing was found to improve the performance of the shields as heat reflectors. The com­position of the electrolyte was chosen in such a way that the large shields of Mo, Inconel and SS can be polished using the same reagents in different ratios. The present work deals with the development of a standard electropolishing procedure for large metallic sheets and subsequently qualifying them by roughness and emissivity measure­ments. The improvement noted in the shielding efficiency of the furnace in the subsequent runs is also discussed here.

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Published
15-03-2015
Section
Electrochemical Science