Sumitomo Coal Mining Co., Ltd.

Other

Suwanetsu Kogyo Co., Ltd.

Masao Tokita

Hitoshi Karasawa

Yoshito Miyasaka

Fumitake Nishiyama

Toshio Hirai

Mamoru Omori

Disclosed is a novel electric joining method and apparatus that can overcome the defects associated with the prior art while taking advantage of the technology for the pulse excited sintering process such as spark plasma sintering process or the hot-press joining process. According to the present invention, an electric joining apparatus for joining a plurality of members to be joined at the joining surfaces thereof, comprises: a pair of current-currying electrodescapable of contacting with the members so as to apply electricity to the members; a power supplyconnected to the pair of energizing electrodes for supplying the energizing electrodes with at least either one of a DC current or a pulsated current; and a pressurizing unitfor compressing each of the pair of electrodes against the joining surfaces, wherein the pair of members are sandwiched between the energizing electrodes and applied with at least either one of the DC current or the pulsated current from the power supply under a desired pressure, thus to be joined, without using a die made of graphite.

Electric joining method and apparatus and a joined unit of members

The present invention is a method of loading a desired amount of powder material into a mold which comprises a tubular body having a bore extending therethrough to define a mold cavity. The method comprises the steps of: providing the mold with a lower press core fitted in the lower end of the bore; bringing the mold with said lower press core fitted therein to a powder filling position; displacing the lower press core relative to the mold so as to determine the depth of the top surface of the lower press core from the top surface of the mold; filling an amount of powder material into the mold and strickling off any excessive amount of powder material to the level of the top surface of the mold; pressing at a desired pressure the amount of powder material in the mold to form a powder compact; and displacing the powder compact with the lower press core relative to the mold so as to bring the powder compact to a desired position in the mold.

Apparatus for automatically loading powder material into a mold

A method for advantageously producing sintered eutectic ceramics having a homogenous and dense structure, in particular, a eutectic containing a rare earth aluminate compound. The method allows eutectic powder of alumina and a rare earth aluminate compound to stand at a temperature of 1300-1700&deg; C. for 1-120 minutes under vacuum or in an non-oxidative atmosphere under a pressure of 5-100 MPa using a spark plasma sintering apparatus, thereby causing crystal growth to occur to obtain a rare earth aluminate eutectic structure crystal.

Method for preparing eutectic ceramics

Disclosed is a novel electric joining method and apparatus that can overcome the defects associated with the prior art while taking advantage of the technology for the pulse excited sintering process such as spark plasma sintering process or the hot-press joining process. According to the present invention, an electric joining apparatus for joining a plurality of members to be joined at the joining surfaces thereof, comprises: a pair of current-currying electrodes capable of contacting with the members so as to apply electricity to the members; a power supply connected to the pair of energizing electrodes for supplying the energizing electrodes with at least either one of a DC current or a pulsated current; and a pressurizing unit for compressing each of the pair of electrodes against the joining surfaces, wherein the pair of members are sandwiched between the energizing electrodes and applied with at least either one of the DC current or the pulsated current from the power supply under a desired pressure, thus to be joined, without using a die made of graphite.

The present invention is a method of automatically loading powder material into a sintering mold and subsequently effecting electrical sintering to the powder material in the sintering mold.

Growing community of inventors

Tokyo, Japan

Masao Tokita