Process for producing sinters and binder for use in that process

Details Process for producing sinters and binder for use in that process Process for producing sinters and binder for use in that process

1991-12-31

1993-11-30

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 38, 419 53, 419 57, B22F 312

Patent

active

052662640

ABSTRACT:
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.

REFERENCES:
patent: 4721599 (1988-06-01), Nakamura
patent: 4948426 (1990-08-01), Kato et al.
patent: 4956012 (1990-09-01), Jacobs et al.
patent: 5059387 (1991-10-01), Brasal
patent: 5067979 (1991-11-01), Kiyota et al.

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