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EPNM 2012 Strasbourg Explosive welding of tin Petr Nesvadba, Katerina Busova, Petr Havlicek, Josef Ondruska OZM Research Instruments & Technologies for.

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Presentation on theme: "EPNM 2012 Strasbourg Explosive welding of tin Petr Nesvadba, Katerina Busova, Petr Havlicek, Josef Ondruska OZM Research Instruments & Technologies for."— Presentation transcript:

1 EPNM 2012 Strasbourg Explosive welding of tin Petr Nesvadba, Katerina Busova, Petr Havlicek, Josef Ondruska OZM Research Instruments & Technologies for Energetic Materials Czech Republic 1/21

2 OUTLINE  Introduction  Experimental Procedure and Materials  Test Results  Conclusion 2/21

3 INTRODUCTION Motivation  Semi-products for manufacturing the Cu–Sn targets  Weld ability of Sn and selected metals  Test of new explosives mixture 3/21

4 EXPERIMENTAL PROCEDURE AND MATERIALS Problems  Melting point Sn = 232°C (449°F)  Manipulation with low-strength metal  Simultaneous method of cladding  Achieving more than 10 mm Sn layer  Explosive composition with low detonation velocity 4/21

5 Sample Compound [%] Density [g.cm -3 ] Thickness of explosive layer [mm] Detonation velocity [m.s -1 ] Sensitivity to detonator No. 8 PETNNaHCO 3 NaNO 3 AlParaffin 11277,5-100,51, yes ,01350yes ,01200yes ,0950no ,911220yes ,951100yes ,971270yes ,90 – 0, yes ,92 – 0,95790no Samples of explosives EXPERIMENTAL PROCEDURE AND MATERIALS 5/21

6 Sample Compound [%] Density [g.cm -3 ] Thickness of explosive layer [mm] Detonation velocity [m.s -1 ] Sensitivity to detonater No. 8 PETNNaHCO 3 NaNO 3 Micro bubbles K , yes ,0 – 1, yes ,181460unreliably S ,97 – 1, yes S 0 12K ,90 – 1, yes S ,00 – 1, unreliably Samples of explosives EXPERIMENTAL PROCEDURE AND MATERIALS 6/21

7 Sample of explosives no. 6 (S 0 8A6) EXPERIMENTAL PROCEDURE AND MATERIALS 7/21

8 EXPERIMENTAL PROCEDURE AND MATERIALS Sample of explosives S 0 12K 8/21

9 EXPERIMENTAL PROCEDURE AND MATERIALS Accelerating of plate Trajectory [mm] Speed of plate [m.s -1 ] 1 Theoretical course Semtex S30 2 Area of measured data Semtex S30 3 Area of measured data S 0 12K weight of explosives / weight of plate = 2.0 9/21

10 Sn Mosadz Sn SteelBrass AlCu D = 1400 m.s -1 EXPERIMENTAL PROCEDURE AND MATERIALS 10/21

11 EXPERIMENTAL PROCEDURE AND MATERIALS SnSnSn Steel Microstructure of bimetal steel – Sn D = 1181 m.s -1 11/21

12 EXPERIMENTAL PROCEDURE AND MATERIALS Microstructure of bimetal Al – Sn D = 1181 m.s -1 Sn Sn Sn Sn Al 12/21

13 EXPERIMENTAL PROCEDURE AND MATERIALS Microstructure of bimetal Brass – Sn D = 1413 m.s -1 Sn Sn Sn Brass 13/21

14 EXPERIMENTAL PROCEDURE AND MATERIALS Microstructure of bimetal Cu – Sn D = 1181 m.s -1 Sn Cu Sn Sn 14/21

15 4 mm Sn D = 1418 m.s -1 1 mm Sn D = 1238 m.s -1 EXPERIMENTAL PROCEDURE AND MATERIALS Explosive welding of Cu – Sn samples Thickness Sn from 1 to 12 mm 15/21

16 Melting of Sn – Sn interface EXPERIMENTAL PROCEDURE AND MATERIALS 16/21

17 Melting of Sn – Sn interface EXPERIMENTAL PROCEDURE AND MATERIALS 17/21

18 EXPERIMENTAL PROCEDURE AND MATERIALS Cu – Sn bimetal Crack on the interface Cu – Sn by simultaneous cladding of two Sn layer 18/21

19  Cladding of tin with others metal materials by using explosives with detonation velocity not exceeding 1500 m.s -1, optimum max m.s -1  Selected metal materials are possible cladding by tin  It is possible to clad tin in various thickness TEST RESULTS 19/21

20 CONCLUSION  It managed to clad tin on steel, aluminum, brass and copper  Local melting zone of tin is not possible to eliminate probably  Melting of tin during cladding of tin thickness 6 mm and more  Failed to clad Sn + Sn, in all cases was observed melting interface  Simultaneously cladding of tin was not successful 20/21

21 THANK YOU FOR YOUR ATTENTION ATTENTION 21/21


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