NDLI: Replicate wolter-i x-ray mirrors

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Replicate wolter-i x-ray mirrors

Content Provider	NASA Technical Reports Server (NTRS)
Author	Rood, R. Fawcett, S. Engelhaupt, D. E. Griffith, C. Khanijow, R.
Copyright Year	1994
Description	Cylindrical (hyperbolic - parabolic Wolter I) mirrors have been electroformed from nickel over an electroless nickel-phosphorous (NiP) plated aluminum mandrel in support of the NASA AXAF-S x-ray spectrometer program. The electroless nickel was diamond turned and polished to achieve a surface finish of 10 angstroms rms or better. Gold was then plated on the nickel alloy after an electrochemical passivation step. Next a heavy layer of pure nickel was plated one millimeter thick with controlled stress at zero using a commercial PID program to form the actual mirror. This shell was removed from the NiP alloy coated mandrel by cryogenic cooling and contraction of the aluminum to release the mirror. It is required that the gold not adhere well to the NiP but all other plated coatings must exhibit good adherence. Four mirrors were fabricated from two mandrels prepared by this method. The area of each part is 0.7 square meters (7.5 square feet).
File Size	2275822
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19960003153
Archival Resource Key	ark:/13960/t0ps2q99r
Language	English
Publisher Date	1994-01-01
Access Restriction	Open
Subject Keyword	Optics Nickel Alloys Electroforming Aluminum X Ray Spectroscopy Mandrels Cryogenic Cooling Electroless Deposition Coatings Surface Finishing Fabrication Paraboloid Mirrors Millimeter Waves X Ray Astrophysics Facility Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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