Title:
HEAT TREATMENT FURNACE
Document Type and Number:
Japanese Patent JP3903448
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent an unacceptable article from being produced by eliminating the scattering of temperature in a heat treatment furnace, especially around a powder molded body and making uniform the degreasing and sintering at each part of the power molded body.
SOLUTION: A retort box 26 that is surrounded by a heater 22 and heat- insulating materials 10, 15, and 23 and further accommodates a power molded body where a sweep gas supply part 24 is connected is provided in a vacuum chamber 1 with double wall structure and a cooling water channel 5. Preferably, shutters 13 and 18 are provided at the end part heat-insulating materials 10 and 15 for surrounding the retort box 26, respectively, on the other hand shutters 13 and 18 are provided at the rear of the shutter 18, a high melting-point conductor is included between a heater electrode that is supported through the heat- insulating materials 10, 15, and 23 and a watercool power supply electrode that is supported through the vacuum chamber 1, and also a sheet whose main constituent is graphite is applied to the inner-periphery surface of the heat- insulating materials 10, 15, and 23.
Inventors:
Matsumoto Katsumi
Tetsuo Hiratsuka
Takahiro Fujita
Hideki Yamaguchi
Tetsuo Hiratsuka
Takahiro Fujita
Hideki Yamaguchi
Application Number:
JP8293498A
Publication Date:
April 11, 2007
Filing Date:
March 13, 1998
Export Citation:
Assignee:
DOWA Holdings Co., Ltd.
International Classes:
C04B35/64; F27B17/00; B22F3/10; (IPC1-7): F27B17/00; B22F3/10; C04B35/64
Domestic Patent References:
| JP9145257A | ||||
| JP63243683A | ||||
| JP6147776A | ||||
| JP61295303A |
Attorney, Agent or Firm:
Shoji Yamamoto