Nippon Tungsten Co., Ltd.

Sumitomo Special Metals Co., Ltd.

Sumitomo Special Metal Co. Ltd.

Kiyohito Misumi

Takashi Kitahira

Toshiaki Wada

Michito Miyahara

Mitsuhiko Furukawa

Masaharu Shiroyama

Yoshiaki Katsuyama

Sakae Tanaka

Mitsuhiki Furukawa

A sintered material for recording/reading (particularly magnetic) head slider is produced by:

Process for the production of magnetic head sliders

A sintered article of silicon carbide containing 2 to 12% by weight of erbium oxide, not more than 2% by weight of aluminum oxide, existing in the form of a composite oxide exhibits remarkable characteristics in resisting to oxidation, thermal shock and corrosion, and shows increased strength at elevated temperatures due to their effect to compaction of resulting structure of the sintered article due to retaining fineness of crystal grains. Those meritorious effects can be enhanced by adding to the aforementioned composition 0.5 to 6.0% by weight of at least one element selected from among titanium, vanadium, chromium, manganese, magnesium, yttrium, zirconium, niobium, molybdenum, barium, lanthanum, cerium, gadolinium, hafnium, tantalum, tungsten, thorium, and cesium or a compound of this element.

High-density sintered article of silicon carbid

Magnetic head sliders, materials therefor, and the process for the

Aluminum oxide substrate material for magnetic heads having improved toughness consisting essentially of: (1) 100 parts by weight, consisting of aluminum oxide and 30 to 50 parts by weight of (TiC+TiO.sub.2), and that provided TiO.sub.2 /(TiC+TiO.sub.2).times.100=5 to 15, (2) 0.5 to 5 parts by weight of addition of free cutting comprising at least one from the group of MgO, NiO, Cr.sub.2 O.sub.3 and ZrO.sub.2, and (3) 0.05 to 2 parts by weight of Y.sub.2 O.sub.3. The method of hot-forming aluminum oxide substrate material for magnetic head having improved sinterability consisting of (a) preparing a green compact by molding a raw material mixture which contains: (1) 100 parts by weight, consisting of aluminum oxide and 30 to 50 percent by weight of (TiC+TiO.sub.2), and that provided TiO.sub.2 /(TiC+TiO.sub.2).times.100=5 to 15, (2) 0.5 to 5 parts by weight of machinability agents comprising at least one from the group of MgO, NiO, Cr.sub.2 O.sub.3 and ZrO.sub.2, and (3) 0.05 to 2 parts by weight of Y.sub.2 O.sub.3 (b) optionally presintering said green compacts; and effecting sintering.

Aluminum oxide substrate material for magnetic head and method for

Magnetic head slider material consisting of 5.about.10 percent by weight of silicon, 1.3.about.7.8 percent by weight of tungsten silicide and essentially balanced silicon carbide. And it is method for producing said magnetic head slider material that at the time of which the mixed powder consisting of silicon carbide, carbon and tungsten is sintered, cellulose is also mixed with said mixed powder and sintered together at the same time. And then fibrous micropores are caused to the sintered body by the above-described sintering, after that molten metallic silicon infiltrated into fibrous micropores.

Magnetic head slider material and method for producing the same

A material for magnetic head sliders comprises a mixed powder consisting of 40 to 80% by weight of Al.sub.2 O.sub.3 and 20 to 60% by weight of TiO.sub.2, and further contains, per 100 parts by weight of the Al.sub.2 O.sub.3 and TiO.sub.2 mixture, 0.5 to 5 parts by weight of at least one of CaO, MgO and Y.sub.2 O.sub.3, and 0.5 to 10 parts by weight of ZrO.sub.2.

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Kurume, Japan

Kiyohito Misumi