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Design And Construction Of The Gallium Melting Point

Design And Construction Of The Gallium Melting Point. Jovan Bojkovski, Miha Hiti, Valentin Batagelj EUROMET 732 project, WP 5 MIRS/FE-LMK 24.11.2006. Summary. Activities so far Design Material Cleaning process Filling process Testing Future activities Analysis of the material

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Design And Construction Of The Gallium Melting Point

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  1. Design And Construction Of The Gallium Melting Point Jovan Bojkovski, Miha Hiti, Valentin Batagelj EUROMET 732 project, WP 5 MIRS/FE-LMK 24.11.2006

  2. Summary • Activities so far • Design • Material • Cleaning process • Filling process • Testing • Future activities • Analysis of the material • Analysis of the design and its influences • Intercomparison with other laboratories (SMU, ...)

  3. Design (1) • “Classical” design (YSI, Isotech, ...) • So-called virgin teflon as basis for enclosure and thermometer well • Only two parts  decrease of possible leakage • Inside and outside aluminium tube in order to increse radial heat transfer • Dimmensions same as commercial  possibility to realize it inside special furnace

  4. Design (2) • 30 cm length • 3,5 cm width • Thickness of the walls 2 mm • Immersion depth 20 cm

  5. Material (1) • Nominally > 7 N purity • Source of material China (Guangzhou Youyuan Metals & Chemicals Co.,Ltd.) • Very cheap material  risk of getting material of poor quality • 1 kg of Ga = 700 $ • 1 kg of Zn = 780 $ • However, we didn’t have any experience  high possibility of errors and contamintion of better and more expensive gallium

  6. Material (2)

  7. Cleaning process (1) • Dry cleaning to eliminate any leftovers from machining process • Cleaning with mild detergent • Cleaning with pure alcohol • Cleaning with double destilled water • Ultrasonic cleaning with destilled water

  8. Cleaning process (2)

  9. Filling process (1) • It has been filled inside dry-box • Known concentration of water vapour (< 20 ppm) and oxygen (<1 ppm) inside the dry-box • Material melted and filled to the teflon container and closed inside controlled atmosphere

  10. Filling process (2)

  11. Testing • Only part of testing has been made • First stage is direct comparison to the reference cell used in EUROMEt 552.K3 • Realization inside different thermal enclousers • Difference from reference cell is +40 microK

  12. Reference cell

  13. Stability of resistor bath

  14. New cell results (1)

  15. New cell results (2)

  16. New cell results (3)

  17. Problems • Long response time • Thickness of teflon ? • Repeatable decrese at the beginning of the plateau • Material composition • “Short-circuit” of the material  thermometer is influenced by the furnace • ......

  18. Further activities • Analysis of the material • Analysis of the design and its influences • Intercomparison with other laboratories (SMU, ...) • Building new cells from existing material • Buying new material if necessary

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