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Plasma consists of a gas mixture containing free radicals, excited positively and negatively charged particles and uncharged gases. These plasmas are generated by a radio frequency energy source.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
89% of the total text.
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Method of Plasma Treatment on Magnetic Coatings
Plasma consists of a gas mixture containing free radicals, excited positively
and negatively charged particles and uncharged gases. These plasmas are
generated by a radio frequency energy source.
Most polymeric materials have surface energy characteristics that reduce
wettability and bondability. Surface wettability and bondability are the critical
factors affecting lubricant retention on the surface of the magnetic coating. It has
been known that the more uniform and the higher the lubricant retention on the
surface, the better the wear performance of the magnetic coating.
The present process provides a new method of surface treatment of organic
or inorganic magnetic coatings to improve wettability and bondability of a
lubricant onto the surface. The treatment contributes to the wear resistance and
lubrication of the recording head and magnetic disk or tape.
Heretofore, the untreated surface had poor wettability to the applied lubricant,
and the lubricant was mechanically forced into the surface with extreme pressure
and heat. The present plasma treatment is believed to decrease contact angle,
improve roughness and porosity without drastically increasing the peak to valley
unevenness of the surface, and still hold more lubricant evenly throughout the
magnetic disk or tape.
The method is applicable to various gaseous or liquid mixtures which include
monomers, hydrogen fluoride, silicone compounds, etc. The irradiati...