Other

Fujitsu Corporation

Chubu Electric Power Company, Inc.

Showa Electric Wire & Cable Co., Ltd.

Yabashi Industries, Co., Ltd.

Ashai Glass Company, Limited

Yoshihiro Abe

Toshihiro Kasuga

Hideo Hosono

Yoshio Ota

Tetsushi Iwashita

Takeshi Akamatsu

Eikichi Inukai

Koichi Nakamura

A process for producing hydroxyapatite fibers is disclosed. The process comprises the steps of preparing a mixture of (1) calcium metaphosphate fibers and (2) calcium oxide, calcium hydroxide and/or calcium carbonate powder; heating the mixture to convert the calcium metaphosphate to hydroxyapatite; and removing calcium oxide in the heat-treated mixture by dissolving off from the resulting mixture.

Process for producing hydroxyapatite fibers

A tubular metal pipe and a solidified melt of a precursor of oxide superconducting material which is placed in contact with the metal pipe are subjected to heat treatment in an oxidizing atmosphere and at a temperature above the partial fusion temperature of the solidified melt to oxidize the metal pipe from its inside and outside and, as the oxidation proceeds, a melt of the solidified melt is effused through the tubular metal oxide layer to form a superconducting layer on its surface. This makes it possible to easily obtain a hollow oxide superconductor wherein a superconducting material layer is formed outside the metal oxide layer.

'Method for preparing hollow oxide superconductors'

A method of fabricating a superconducting ceramic pipe including the steps of: melting a ceramic powder having a predetermined composition to form a melt; filling a supporting tube with the melt by a suction caused by a vacuum pressure; partially solidifying an outer part of the melt near the tube to form a shell (i.e., a ceramic pipe); discharging an inner unsolidified part at the center of the tube from the tube by gravity, to form a solidified ceramic pipe on the inside surface of the tube; and heat treating the ceramic pipe to convert it into a superconducting pipe. When a supporting tube with a bottom plate is used, the melt is poured into the tube, and the tube is turned over to remove an unsolidified melt, whereby a superconducting ceramic pipe with a bottom is fabricated.

Method of fabricating superconducting ceramic pipe

A phosphate glass such as calcium metaphosphate (Ca(PO.sub.4).sub.2) is heat-treated in a temperature gradient to obtain a crystallized glass (glass-ceramics) made of oriented fiber like crystals which has high bending strength in an abraded state.

Method of producing crystallized glass from phosphate glass

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Nisshin, Japan

Yoshihiro Abe