An analysis of induction brazed beryllium on copper alloy substrates [JET divertor]

Author

Altmann, H. ; Deksnis, E.B. ; Ibbott, C. ; Sborchia, C. ; Tivey, R. ; Viola, R.

Author_Institution

JET Joint Undertaking, Abingdon, UK

fYear

1993

fDate

11-15 Oct 1993

Firstpage

1

Lastpage

4

Abstract

A long pulse JET divertor requires the production of beryllium clad copper alloy hypervapotron target plates. Vacuum brazing of beryllium poses a number of problems relating to the stable beryllium oxide and ready formation of brittle intermetallics. Induction brazing offers some advantages and a rig has been developed for producing vapotron test target plates for power load testing in the Neutral Beam Test Bed. The brazed components have survived over 1000 shots at 13 MW/m ² with an ultimate power loading capability up to 17 MW/m². These results have been interpreted with respect to both localised stresses and thermal fatigue at the interface. This study analyses the power handling capability with respect to instantaneous heat flux failure, localised hot spots from target plate deflections and high cycle fatigue with a view to establishing an optimum unit size

Keywords

fusion reactor materials; Be; Cu alloy substrates; JET; divertor; fatigue; hypervapotron target plate; induction brazed Be; induction brazing; instantaneous heat flux failure; localised hot spots; power loading; stresses; thermal fatigue; vacuum brazing; Copper alloys; Fatigue; Gettering; Intermetallic; Ovens; Temperature; Testing; Thermal stresses; Tiles; Titanium;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering - Supplement, 1993., 15th IEEE/NPSS Symposium on

Conference_Location

Hyannis, MA

Type

conf

DOI

10.1109/SFE.1993.472797

Filename

472797