Effect of electropolishing on vacuum furnace design
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...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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International Association of Physical Chemists (IAPC)
2015-03-01
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| Series: | Journal of Electrochemical Science and Engineering |
| Subjects: | |
| Online Access: | http://www.pub.iapchem.org/ojs/index.php/JESE/article/view/175 |
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| author | Sutanwi Lahiri Girish Kumar Sahu Biswaranjan Dikshit Radhelal Bhardwaj Ashwini Dixit Ranjna Kalra Kiran Thakur Kamalesh Dasgupta Asoka Kumar Das Lalit Mohan Gantayet |
| author_facet | Sutanwi Lahiri Girish Kumar Sahu Biswaranjan Dikshit Radhelal Bhardwaj Ashwini Dixit Ranjna Kalra Kiran Thakur Kamalesh Dasgupta Asoka Kumar Das Lalit Mohan Gantayet |
| author_sort | Sutanwi Lahiri |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-13T03:15:22Z |
| format | Article |
| id | doaj.art-e0d3c8efb7c64e779b1dd77f7190af47 |
| institution | Directory Open Access Journal |
| issn | 1847-9286 |
| language | English |
| last_indexed | 2024-12-13T03:15:22Z |
| publishDate | 2015-03-01 |
| publisher | International Association of Physical Chemists (IAPC) |
| record_format | Article |
| series | Journal of Electrochemical Science and Engineering |
| spelling | doaj.art-e0d3c8efb7c64e779b1dd77f7190af472022-12-22T00:01:30ZengInternational Association of Physical Chemists (IAPC)Journal of Electrochemical Science and Engineering1847-92862015-03-015110.5599/jese.175Effect of electropolishing on vacuum furnace designSutanwi Lahiri0Girish Kumar SahuBiswaranjan Dikshit1Radhelal Bhardwaj2Ashwini Dixit3Ranjna Kalra4Kiran Thakur5Kamalesh Dasgupta6Asoka Kumar Das7Lalit Mohan Gantayet8Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, IndiaLaser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, IndiaLaser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, IndiaLaser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, IndiaLaser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, IndiaLaser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, IndiaLaser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, IndiaLaser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, IndiaBeam Technology Development Group, Bhabha Atomic Research Centre, Mumbai-400085, IndiaThe 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.http://www.pub.iapchem.org/ojs/index.php/JESE/article/view/175Thermal shieldsetchingemissivity |
| spellingShingle | Sutanwi Lahiri Girish Kumar Sahu Biswaranjan Dikshit Radhelal Bhardwaj Ashwini Dixit Ranjna Kalra Kiran Thakur Kamalesh Dasgupta Asoka Kumar Das Lalit Mohan Gantayet Effect of electropolishing on vacuum furnace design Journal of Electrochemical Science and Engineering Thermal shields etching emissivity |
| title | Effect of electropolishing on vacuum furnace design |
| title_full | Effect of electropolishing on vacuum furnace design |
| title_fullStr | Effect of electropolishing on vacuum furnace design |
| title_full_unstemmed | Effect of electropolishing on vacuum furnace design |
| title_short | Effect of electropolishing on vacuum furnace design |
| title_sort | effect of electropolishing on vacuum furnace design |
| topic | Thermal shields etching emissivity |
| url | http://www.pub.iapchem.org/ojs/index.php/JESE/article/view/175 |
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