Title:
MANUFACTURE OF ELECTRICALLY CONDUCTIVE PIPE
Document Type and Number:
Japanese Patent JP3603971
Kind Code:
B2
Abstract:
PURPOSE: To facilitate manufacture of a highly pure tough silicon pipe by a method wherein conductive materials charged into annular gap formed between two bottomless crucibles are melted by heating from inside and outside with an induction coil and gradually drawn out.
CONSTITUTION: Inside-to-outside reversed surface currents are induced on silicon melt 19 formed between two bottomless crucibles 6a, 6b since a current flows through induction coils 7a, 7b. At that time, the silicon melt 19 is stably held in a state of non-contact to the bottomless crucibles 6a, 6b. Further, a current is started to pass through an induction coil 11 to raise temperature of a heat reserving furnace 8, and temperature at an upper end of the heat furnace 8 is kept at a specific temperature. Then, when a drawing out shaft as not given in the figure is lowered, a bottom part of the silicon melt 19 is drawn out from bottom ends of the induction coils 7a, 7b, and dielectric force is attenuated. Therefore, the temperature is lowered, and solidification starts. Charged silicon materials 17 are newly melted in an upper part of the silicon melt 19, and a silicon pipe 18 is continuously casted.
Inventors:
Kyojiro Kaneko
Application Number:
JP6467995A
Publication Date:
December 22, 2004
Filing Date:
February 27, 1995
Export Citation:
Assignee:
Sumitomo Titanium Co., Ltd.
International Classes:
B22D11/00; B22D11/01; B22D23/00; B22D23/06; B22D25/02; B28B1/54; B28B21/00; C30B21/02; C30B29/06; (IPC1-7): B22D25/02; B22D11/01; C30B21/02; C30B29/06
Domestic Patent References:
| JP3226338A | ||||
| JP5213691A | ||||
| JP2051493A | ||||
| JP3254354A |
Attorney, Agent or Firm:
Takahiko Yanagita
Shoji Yoshida
Shoji Yoshida