NDLI: The potential for SAGBO cracking in a Nb3Sn wind-and-react solenoid using a CICC with Incoloy 908 jacket and glass fabric insulation

Content Provider	IEEE Xplore Digital Library
Author	Bonito-Oliva, A. Kenney, S. Scheneider-Muntau, H.J. Summers, L.
Copyright Year	1965
Abstract	The 45-T Hybrid Magnet System being constructed for the National High Magnetic Field Laboratory (NHMFL) in collaboration with the Francis Bitter National Laboratory is composed of a resistive insert and superconducting outsert. Two of the outsert solenoids use Nb3Sn and will be wound with cable-in-conduit conductors (CICCs) using the wind-and-react technique. A candidate for the jacket material is Incoloy 908, but an obstacle to this choice is its sensitivity to Stress Accelerated Grain Boundary Oxidation (SAGBO). The conditions for SAGBO-residual stress, elevated temperature, and exposure to oxygen (even in extremely low levels)-are difficult to avoid in coils fabricated by the wind-and-react process. The glass fabric insulation, applied during winding, is at high temperature, both a source of oxygen (primarily in the form of absorbed water vapor) and, being highly compacted by the winding, an impediment to its removal. In attempt to solve this problem NHMFL has developed a pre-baking procedure in vacuum at 730 C, to be applied to the glass fabric before to insulate the coil. In order to test the efficiency of pre-baking and to check the existence of possible other features that also lead to SAGBO, a dummy coil, wound with a CIC conductor jacketed with Incoloy 908, has been manufactured. The coil has been heat treated in very high purity helium atmosphere. The results are reported.
Sponsorship	IEEE Magnetics Society
Starting Page	2495
Ending Page	2498
Page Count	4
File Size	526718
File Format	PDF
ISSN	00189464
Volume Number	32
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Niobium-tin Solenoids Coils Superconducting magnets Laboratories Superconducting cables Wounds Conducting materials Stress Temperature sensors
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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