The Japan Steel Works, Ltd.

Yasushi Owaki

Takashi Iwamoto

Shunroku Sukumoda

Yoshinori Kawaharazaki

Yasuhiro Fujita

Yukio Sato

Hirokazu Madarame

Ritsu Miura

Yoshihiko Hayashi

Masahiro Uchida

Masayuki Kawai

Shinichi Ono

Kohtaroh Nagahara

Masashi Tomiie

In the hydrogen remaining sensor of the present invention, the hydrogen remaining sensor is arranged in a space in which the hydrogen is absorbed/released by the main hydrogen storage alloy, and is equipped with the vessel-like sensor main body in which the sensor hydrogen storage alloy is filled and through which the hydrogen is moved. Also, the easy-to-deform portion in which the strain is caused easily due to the hydrogen absorption/release of the sensor hydrogen storage alloy is provided to a part of the sensor main body, and the strain gauge for measuring the strain of the easy-to-deform portion is provided. As a result, according to the hydrogen remaining sensor of the present invention can contribute to sense precisely a remaining amount of hydrogen in the main hydrogen storage alloy.

Remaining hydrogen sensor

In a heat transfer pipe, annular grooves in a direction inclined at an angle of 45&deg; to 90&deg; with respect to an axis of the pipe are continuously formed at an interval in a longitudinal direction of the pipe. The annular grooves desirably have a groove depth of 0.20 mm or more, and a groove pitch of two to five times larger than the groove depth. Moreover, a ratio W/P of a bottom width W of projections of the grooves to the groove pitch P is desirably 0.1 to 0.9.

Heat transfer pipe for liquid medium having grooved inner surface and heat exchanger employing the same

The present invention relates to a process for producing sinters, including a steps of mixing a powder material with a binder, injection molding the mixture, and then dewaxing and sintering the resulting injection molded article, wherein the binder comprises at least one of: copolymer, a mixture of copolymer, paraffine wax, carnauba wax, a mixture of the paraffine wax and the carnauba wax, a plasticizer, and a lubricant. According to the present invention, the dewaxing step comprises heating the injection molded article to a temperature of 250.degree.-500.degree. C. in a heating rate of 5.degree.-100.degree. C./hour under the pressure not higher than 1 Torr in order to remove 40%-95 % by weight of the binder components. Further, the temperature elevation in the sintering step is started in a vacuum atmosphere and replacing the atmosphere with an inert gas atmosphere in the process of temperature elevation.

Process for producing sinters and binder for use in that process

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Hokkaido, Japan

Yasushi Owaki