Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making porous product
Patent
1996-06-26
1999-08-24
Jenkins, Daniel J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making porous product
419 9, 419 37, 419 57, 264497, B22F 310
Patent
active
059435437
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to heat transmitting members, such as a heat transmitting pipe and a heat transmitting plate for heat exchange, which are employed in various industrial fields. It also relates to methods of manufacturing the heat transmitting members.
DESCRIPTION OF RELATED ART
Heretofore, heat transmitting pipes and heat transmitting plates made of metals such as copper and aluminum exhibitive of high thermal conductivities have generally been used for exchanging heat, e. g., between liquids, between a liquid and a gas, and between gases. It is admitted, however, that the capacity of heat to be exchanged is determined depending upon a temperature difference, heat transmission characteristics, a heat transmission area, etc. which are involved between the respective thermal media. Accordingly, especially in a case where a heat exchanger needs to be reduced in size, the mere use of the material exhibitive of the high thermal conductivity is unsatisfactory. Therefore, the heat transmission area has been enlarged by providing fins on or slots in the surface of the heat transmitting pipe or plate. Further, the heat transmission characteristics have been enhanced by contriving a fin construction so as to generate a turbulent flow in the thermal media. Besides, in the official gazettes of Japanese Patent No. 1435526 and Japanese Patent Application Laid-open (KOKAI) No. 110597/1992, there have been proposed techniques in which a porous material or foamed material of copper or copper alloy is fixed, whereby both the enlargement of the heat transmission area and the enhancement of the heat transmission characteristics are attained to reduce the size of the heat exchanger.
The proposed techniques, however, have been disadvantageous as stated below. In fixing the porous or foamed material of copper or copper alloy, the technique of Japanese Patent No. 1435526 adopts for the binding and close adhesion of this material with the body of the heat transmitting member, a method wherein molten metal is poured into a mold having the shape of the foamed material and is solidified, followed by the dissolution of the foamed material-shaped mold. On the other hand, the technique of Japanese Patent Application Laid-open No. 110597/1992 requires a further expedient such as pressed contact, brazing or plating at the final step of the fixing in order to rigidly join the porous material with the body of the heat transmitting member. The prior-art techniques accordingly have the problems that the cost of equipment and the cost of manufacture rise unreasonably compared with the attained effects of enlarging the heat transmission area and enhancing the heat transmission characteristics, and that the process of manufacture becomes complicated. Another problem is that, in the manufacture of the heat transmitting pipe, the porous or foamed material cannot be fixed simultaneously inside and outside the body of the pipe.
DISCLOSURE OF THE INVENTION
The present invention is intended to solve the problems as stated above. It has for its object to provide a heat transmitting member in which the body thereof such as a metal plate or metal pipe of high thermal conduction is overlaid with a porous metal material having a large surface area and a high percentage of voids per unit volume, and a continuous and complete method of manufacturing the heat transmitting member.
According to the present invention, a heat transmitting pipe and a heat transmitting plate in which a porous metal material of three-dimensional reticulate structure is unitarily fixed on, at least one of the surfaces of a metal pipe and a metal plate, respectively, can be obtained by utilizing the property that powder of copper oxide, or mixed powder which consists of the copper oxide powder and powder of other metal such as nickel, aluminum, chromium, palladium or silver, is sintered as a metal material by heating, and the property that the metal material can be made unitary with the metal pipe or plate when the heating is carried out on
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Hiratsuka Hatsue
Kamigata Yasuo
Tsuboi Hidefumi
Uchida Tatsuya
Yoshida Takeshi
Hitachi Chemical Company Ltd.
Jenkins Daniel J.
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