Oxidizing catalytic activity of a slider is a factor which could affect wear of magnetic disks with a carbon overcoat. Al2O3 composites containing 2–50 mol% TiO2 were produced, which had different oxidizing catalytic activities but nearly the same hardness and thermal conductivity. Activation energy (Ec) for carbon oxidation when it is mixed with the composite was measured to get the oxidizing catalytic activity, and it was found that Ec changed from about 70 kJ/mol for Al2O3 to about 110 kJ/mol for Al2O3 containing 9.1–16.7 mol% TiO2. TiO2 addition increased and decreased Ec. The former was due to segregation of the Ti-Al-O phase at the Al2O3 grain boundary, which could inhibit the catalysis at the Al2O3 grain boundary. The latter was due to the unreacted TiO2 phase, which by itself has high catalytic activity. TiO2-Al2O3 sliders having different Ec were examined in sliding wear against a magnetic disk with a carbon overcoat using a pin-on-disk test system. It was found that wear rate of the carbon overcoat was lower when the slider had a larger Ec, i.e., lower catalytic activity. It was also found that wear particles of the carbon overcoat were likely to be larger with lower catalytic activity.
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April 1994
Research Papers
Effect of TiO2 Addition of Oxidizing Catalytic Activity of an Al2O3 Slider for Magnetic Disks
Shinsuke Higuchi,
Shinsuke Higuchi
Hitachi Research Laboratory, Hitachi, Ltd., Hitachi-shi, Ibaraki-ken 317, Japan
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Takeshi Miyazaki,
Takeshi Miyazaki
Hitachi Research Laboratory, Hitachi, Ltd., Hitachi-shi, Ibaraki-ken 317, Japan
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Yasutaka Suzuki,
Yasutaka Suzuki
Hitachi Research Laboratory, Hitachi, Ltd., Hitachi-shi, Ibaraki-ken 317, Japan
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Hideaki Tanaka,
Hideaki Tanaka
Hitachi Research Laboratory, Hitachi, Ltd., Hitachi-shi, Ibaraki-ken 317, Japan
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Iwao Matsuyama
Iwao Matsuyama
Odawara Works, Hitachi, Ltd., Kanagawa-ken 256, Japan
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Shinsuke Higuchi
Hitachi Research Laboratory, Hitachi, Ltd., Hitachi-shi, Ibaraki-ken 317, Japan
Takeshi Miyazaki
Hitachi Research Laboratory, Hitachi, Ltd., Hitachi-shi, Ibaraki-ken 317, Japan
Yasutaka Suzuki
Hitachi Research Laboratory, Hitachi, Ltd., Hitachi-shi, Ibaraki-ken 317, Japan
Hideaki Tanaka
Hitachi Research Laboratory, Hitachi, Ltd., Hitachi-shi, Ibaraki-ken 317, Japan
Iwao Matsuyama
Odawara Works, Hitachi, Ltd., Kanagawa-ken 256, Japan
J. Tribol. Apr 1994, 116(2): 275-279 (5 pages)
Published Online: April 1, 1994
Article history
Received:
March 1, 1993
Revised:
July 14, 1993
Online:
June 5, 2008
Citation
Higuchi, S., Miyazaki, T., Suzuki, Y., Tanaka, H., and Matsuyama, I. (April 1, 1994). "Effect of TiO2 Addition of Oxidizing Catalytic Activity of an Al2O3 Slider for Magnetic Disks." ASME. J. Tribol. April 1994; 116(2): 275–279. https://doi.org/10.1115/1.2927209
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