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Authors : E.G. Kolesnikov, V.A. Stepanov, P.A. Stepanchikov, R.A. Fedoseev, A.N. Shotaev

Production of Large Monocrystalline Ingots and Discs of Molybdenum and its Alloys via Crucibleless Zone Melting for Special Application Products. Authors : E.G. Kolesnikov, V.A. Stepanov, P.A. Stepanchikov, R.A. Fedoseev, A.N. Shotaev. Speakers : P.A. Stepanchikov, V.A. Stepanov.

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Authors : E.G. Kolesnikov, V.A. Stepanov, P.A. Stepanchikov, R.A. Fedoseev, A.N. Shotaev

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  1. Production of Large Monocrystalline Ingots and Discs of Molybdenum and its Alloys via Crucibleless Zone Melting for Special Application Products Authors: E.G. Kolesnikov, V.A. Stepanov, P.A. Stepanchikov, R.A. Fedoseev, A.N. Shotaev Speakers: P.A. Stepanchikov, V.A. Stepanov

  2. Crucibleless Zone Melting with Electron Beam Heating The operational medium of the crystal growth chamber is high vacuum (< 2·10-5mmHg) Maximum length of the grown ingots ≥ 600 mm Diameter of the grown ingots: 13 ÷ 40 mm 2 2 www.sialuch.com

  3. Layout of the Crystal Growth Chamber 5 6 2 3,4 8 1 9 U =5 – 18 kV I = 0.8 – 2.0 A N = 5 – 20 kW 7 1 –bottom screen; 2 –top bed; 3 – top screen; 4 – heating cathode; 5 –polycrystalline workpiece; 6 – growth chamber; 7 – seed crystal; 8 – metal spacers; 9 – bottom bed. www.sialuch.com 3 3

  4. Automated Ingot Growing Process Control System (ACS) • An automated ingot growing process control system has been developed and integrated into the crucibleless zone melting equipment. • For growing crystals whose diameter is ≤ 20 mm, the ACS stabilizes the power yielded in the molten zone with the software control of the high-voltage power source. • For growing crystals whose diameter exceeds 20 mm, the ACS stabilizes the diameter of the growing crystal at the crystallization front. www.sialuch.com 4 4 www.luch.podosk.ru

  5. Sequence of Long Monocrystalline Ingots Production 1 2 3 4 5 1 – an assembly of two cylindrical fillets produced via powder metallurgy; 2 – a polycrystalline workpiece after fillets remelting; 3 – a workpiece machined to the specified dimensions; 4 – a grown long monocrystalline ingot of a specified orientation; 5–a monocrystalline ingot – the final product www.sialuch.com www.sialuch.com 5 5 www.luch.podolsk.ru

  6. Layout of the Growth Chamber with the Modified Drive 1 – growth chamber; 2 – bottom rod; 3 – top rod; 4 – bottom drive; 5 – polycrystalline charge; 6 – monocrystalline seed; 7 – horizontal shaft; 8 – top screen; 9 – water-cooled bed; 10 – bottom screen; 11 – heating cathode; 12 – molten zone www.sialuch.com

  7. Potential of the Technique Employed Grown monocrystalline molybdenum discs Monocrystalline molybdenum plates with dimensions of 100×100×4 made of a monocrystalline disc Axle-disc workpiece www.sialuch.com www.sialuch.com 7 7 www.luch.podolsk.ru

  8. Products and Application Geometry of the products made via electric arc crucibleless zone melting: • Application: • Work pieces for production of zone-refined refractory roll stock (foils, wires, rods, tubes etc); • Monocrystalline pipes of high-temperature nuclear power systems; • Anodes and cathodes of x-ray tubes, electronic tubes; • Ultra-pure targets for sputtering systems employed in electronics industry; • Materials for electronic components resources; • Power mirrors for laser facilities and systems of various applications; • Materials for fundamental physical research. 8

  9. Thank you very much for your attention! 9 9 www.sialuch.com www.luch.podolsk.ru

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