Application of electrical pulsed discharge to metal layer exfoliation from glass substrate of hard-disk platter

The platter, which is the data-storage component of hard-disk drives, contains platinum group metals on a substrate. It is necessary to separate the metal layer from the substrate to recover the platinum group metals and other valuable elements. The separation of the metal layer from the glass subst...

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Autores principales:	Masataka Kondo, Soowon Lim, Taketoshi Koita, Takao Namihira, Chiharu Tokoro
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Hard-disk Platter Pulsed power Separation Platinum group metal Technology T
Acceso en línea:	https://doaj.org/article/1ca09ccd23c34b2fb245b029ff4bfbdd
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spelling	oai:doaj.org-article:1ca09ccd23c34b2fb245b029ff4bfbdd2021-11-18T04:51:22ZApplication of electrical pulsed discharge to metal layer exfoliation from glass substrate of hard-disk platter2590-123010.1016/j.rineng.2021.100306https://doaj.org/article/1ca09ccd23c34b2fb245b029ff4bfbdd2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2590123021001079https://doaj.org/toc/2590-1230The platter, which is the data-storage component of hard-disk drives, contains platinum group metals on a substrate. It is necessary to separate the metal layer from the substrate to recover the platinum group metals and other valuable elements. The separation of the metal layer from the glass substrate were investigated by using two types of pulsed-power generators (PPGs), namely a nanosecond and a microsecond PPG. By conducting repetitive pulse discharges to the platter surface, the metal layer was peeled off and the maximum exfoliation rate reached about 60% for both the nanosecond PPG and the microsecond PPG. The higher the single pulse energy, the higher the exfoliation efficiency. The maximum peeling energy efficiency were 16%/kJ and 30%/kJ for the nanosecond PPG and microsecond PPG, respectively. It was demonstrated that the pulse width affected the formation of the discharge plasma. In the nanosecond PPG, a discharge plasma was formed between the edge of the metal layer and the electrode, whereas in the microsecond PPG, a discharge plasma channel was formed across the metal layer. SEM images of the substrate surface after discharge treatment showed that part of the removed metal layer was molten and reattached to the glass substrate. The reattached particles were spherical with a diameter of ∼10 μm, and were enriched by 20% in terms of ruthenium mass. The exfoliation process of the metal layer by electric pulses and the generation of metal particles were explained.Masataka KondoSoowon LimTaketoshi KoitaTakao NamihiraChiharu TokoroElsevierarticleHard-diskPlatterPulsed powerSeparationPlatinum group metalTechnologyTENResults in Engineering, Vol 12, Iss , Pp 100306- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Hard-disk Platter Pulsed power Separation Platinum group metal Technology T
spellingShingle	Hard-disk Platter Pulsed power Separation Platinum group metal Technology T Masataka Kondo Soowon Lim Taketoshi Koita Takao Namihira Chiharu Tokoro Application of electrical pulsed discharge to metal layer exfoliation from glass substrate of hard-disk platter
description	The platter, which is the data-storage component of hard-disk drives, contains platinum group metals on a substrate. It is necessary to separate the metal layer from the substrate to recover the platinum group metals and other valuable elements. The separation of the metal layer from the glass substrate were investigated by using two types of pulsed-power generators (PPGs), namely a nanosecond and a microsecond PPG. By conducting repetitive pulse discharges to the platter surface, the metal layer was peeled off and the maximum exfoliation rate reached about 60% for both the nanosecond PPG and the microsecond PPG. The higher the single pulse energy, the higher the exfoliation efficiency. The maximum peeling energy efficiency were 16%/kJ and 30%/kJ for the nanosecond PPG and microsecond PPG, respectively. It was demonstrated that the pulse width affected the formation of the discharge plasma. In the nanosecond PPG, a discharge plasma was formed between the edge of the metal layer and the electrode, whereas in the microsecond PPG, a discharge plasma channel was formed across the metal layer. SEM images of the substrate surface after discharge treatment showed that part of the removed metal layer was molten and reattached to the glass substrate. The reattached particles were spherical with a diameter of ∼10 μm, and were enriched by 20% in terms of ruthenium mass. The exfoliation process of the metal layer by electric pulses and the generation of metal particles were explained.
format	article
author	Masataka Kondo Soowon Lim Taketoshi Koita Takao Namihira Chiharu Tokoro
author_facet	Masataka Kondo Soowon Lim Taketoshi Koita Takao Namihira Chiharu Tokoro
author_sort	Masataka Kondo
title	Application of electrical pulsed discharge to metal layer exfoliation from glass substrate of hard-disk platter
title_short	Application of electrical pulsed discharge to metal layer exfoliation from glass substrate of hard-disk platter
title_full	Application of electrical pulsed discharge to metal layer exfoliation from glass substrate of hard-disk platter
title_fullStr	Application of electrical pulsed discharge to metal layer exfoliation from glass substrate of hard-disk platter
title_full_unstemmed	Application of electrical pulsed discharge to metal layer exfoliation from glass substrate of hard-disk platter
title_sort	application of electrical pulsed discharge to metal layer exfoliation from glass substrate of hard-disk platter
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/1ca09ccd23c34b2fb245b029ff4bfbdd
work_keys_str_mv	AT masatakakondo applicationofelectricalpulseddischargetometallayerexfoliationfromglasssubstrateofharddiskplatter AT soowonlim applicationofelectricalpulseddischargetometallayerexfoliationfromglasssubstrateofharddiskplatter AT taketoshikoita applicationofelectricalpulseddischargetometallayerexfoliationfromglasssubstrateofharddiskplatter AT takaonamihira applicationofelectricalpulseddischargetometallayerexfoliationfromglasssubstrateofharddiskplatter AT chiharutokoro applicationofelectricalpulseddischargetometallayerexfoliationfromglasssubstrateofharddiskplatter
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Application of electrical pulsed discharge to metal layer exfoliation from glass substrate of hard-disk platter

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