Title:
HOLLOW MICROFIBER AND PROCESS FOR PREPARING THE SAME
Document Type and Number:
WIPO Patent Application WO/1999/004073
Kind Code:
A1
Abstract:
A hollow carbon microcoil with the coil pitch of substantially zero, and a hollow ceramic microcoil or a hollow ceramic microfiber prepared by subjecting the hollow carbon microcoil to metallization or other treatments. The hollow carbon microcoil with the coil very densely and orderly wound is characterized by being prepared by strictly regulating reaction conditions in the synthesis of carbon in a microcoil form by catalytically activated thermal decomposition of acetylene and allowing a substrate to descend as the fiber grows. A high-temperature reaction/diffusion treatment of the above hollow carbon microcoil as a starting material in a gas containing various metal components, silicon, boron, carbon, nitrogen and/or oxygen atoms at 800 to 1700 °C results in the formation of the hollow ceramic microcoil or microfiber wherein carbon has been reacted or substituted with the starting gas component while completely retaining the hollow of the axis of the fiber.
Inventors:
MOTOJIMA SEIJI (JP)
Application Number:
PCT/JP1998/003251
Publication Date:
January 28, 1999
Filing Date:
July 21, 1998
Export Citation:
Assignee:
JAPAN SCIENCE & TECH CORP (JP)
MOTOJIMA SEIJI (JP)
MOTOJIMA SEIJI (JP)
International Classes:
C01B21/076; C01B31/02; C01B31/30; C01B35/04; D01F9/08; D01F9/127; (IPC1-7): D01F9/127; D06M11/58; D06M11/77; D06M11/81
Foreign References:
| JPH04222228A | 1992-08-12 | |||
| JPS59179875A | 1984-10-12 | |||
| JPH0931757A | 1997-02-04 | |||
| JPH062269A | 1994-01-11 |
Other References:
See also references of EP 0943706A4
Attorney, Agent or Firm:
Saeki, Norio (9th floor 15-2, Nihonbashi 3-chome Chuo-ku Tokyo, JP)
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