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Substrate Reclamation of Sputtered Thin Film Carbon Overcoated Magnetic Media

IP.com Disclosure Number: IPCOM000103315D
Original Publication Date: 1990-Sep-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 54K

Publishing Venue

IBM

Related People

Erickson, GD: AUTHOR [+4]

Abstract

Nickel-plated substrates from sputtered magnetic media rejects can be effectively reclaimed by utilizing plasma ashing techniques followed by a free abrasive polishing process. The plasma ashing step enables one to break down the impervious carbon overcoat layer without doing any physical damage to any of the underlying metals. This then allows one to polish the part back to its original nickel-plated polished state. Since the base substrate is a significant part of the overall finished product cost, utilization of this process is an effective cost-saving measure from rejected parts.

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Substrate Reclamation of Sputtered Thin Film Carbon Overcoated Magnetic Media

      Nickel-plated substrates from sputtered magnetic media rejects
can be effectively reclaimed by utilizing plasma ashing techniques
followed by a free abrasive polishing process.  The plasma ashing
step enables one to break down the impervious carbon overcoat layer
without doing any physical damage to any of the underlying metals.
This then allows one to polish the part back to its original
nickel-plated polished state.  Since the base substrate is a
significant part of the overall finished product cost, utilization of
this process is an effective cost-saving measure from rejected parts.

      Substrate reclamation of thin film carbon overcoated rejected
disks is accomplished by placing the parts into a plasma ashing
system.  The plasma environment causes the carbon overcoat layer to
become volatilized.  The plasma atmosphere can be a mixture of
oxygen, nitrogen and halocarbon 14, or other oxidizing gas mixtures.
Exposure interval of the part(s) is dependent upon the number of
samples to be done at any given time.

      The greatest advantage plasma ashing has over any chemical
stripping technique for reclamation is that it does not damage the
underlying base metals.  Many times the chemicals utilized in these
stripping processes will permeate the nickel layer at a pit site and
reach the aluminum base metal.  This situation increases the
potential for active corrosion sites...