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Manoel, F.E.

Paper Title Page
THPEB042 Development of Diffusion Bonding Joints between Oxgen Free Copper and AISI 316L Stainless Steel for Accelerator Components 3975
 
  • R.H.A. Farias, O.R. Bagnato, F. R. Francisco, D.V. Freitas, F.E. Manoel
    LNLS, Campinas
  
 

Dif­fu­sion bond­ing is a weld­ing pro­cess where the main mech­a­nism re­spon­si­ble for the union of the ma­te­ri­als is the in­ter­dif­fu­sion of atoms across the joint sur­face, even in solid state. The ob­jec­tive of the pre­sent work is to pro­duce bond­ed joints that could be used in vac­u­um com­po­nents for par­ti­cle ac­cel­er­a­tor. Is this work was pro­duced a weld­ing joint be­tween two dis­sim­i­lar ma­te­ri­als: oxy­gen free cop­per and AISI 316 L stain­less steel. Each sam­ple was bond­ed in vac­u­um (10-5m­bar) at a tem­per­a­ture range be­tween 800 and 900°C, pres­sure of 12MPa and hold­ing times be­tween 30 and 60min. Op­ti­cal mi­croscopy, scan­ning elec­tron mi­croscopy, me­chan­i­cal test­ing and he­li­um leak test were used to study the bond qual­i­ty. The im­ages ob­tained by op­ti­cal and elec­tron mi­croscopy re­vealed good qual­i­ty in­ter­faces with­out the pres­ence of de­fects and pores. All sam­ples are test­ed through the he­li­um leak test and were ap­proved. The re­sults in­di­cate great po­ten­tial to use this pro­cess in the man­u­fac­tur­ing of com­po­nents suit­able for ultra high vac­u­um, for ap­pli­ca­tion in the de­sign of new LNLS stor­age ring.