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    4.
    发明专利
    未知

    公开(公告)号：BR8201584A

    公开(公告)日：1983-02-08

    申请号：BR8201584

    申请日：1982-03-22

    Applicant: SERVIMETAL

    Inventor： POLLET GILBERT ,  MANOIR PIERRE DU ,  GUERIT PIERRE

    IPC: C22B9/05 ,  C22B21/06 ,  C22C1/02 ,  C22B9/00

    Abstract: The invention relates to a process and an apparatus for the precise and continuous injection of a halogenated derivative, which is liquid at ambient temperature, into a liquid metal such as aluminum and aluminum-based alloys. The process involves withdrawing the halogenated substance from a tank, introducing it by means of a metering pump into a vaporizer which has been brought to a temperature at least equal to the vaporization temperature of the substance under the injection pressure, and entraining it in the vapor state by an inert gas stream towards an injection means opening into the center of the liquid metal.

    5.
    发明专利
    未知

    公开(公告)号：NO820940L

    公开(公告)日：1982-09-24

    申请号：NO820940

    申请日：1982-03-22

    Applicant: SERVIMETAL

    Inventor： POLLET GILBERT ,  MANOIR PIERRE DU ,  GUERIT PIERRE

    IPC: C22B9/05 ,  C22B21/06 ,  C22C1/02 ,  C22B

    Abstract: The invention relates to a process and an apparatus for the precise and continuous injection of a halogenated derivative, which is liquid at ambient temperature, into a liquid metal such as aluminum and aluminum-based alloys. The process involves withdrawing the halogenated substance from a tank, introducing it by means of a metering pump into a vaporizer which has been brought to a temperature at least equal to the vaporization temperature of the substance under the injection pressure, and entraining it in the vapor state by an inert gas stream towards an injection means opening into the center of the liquid metal.

    Surface diffusion hardening of metals in fused salt bath - by injecting diffusing element as gaseous cpd. into the bath
    8.
    发明专利
    Surface diffusion hardening of metals in fused salt bath - by injecting diffusing element as gaseous cpd. into the bath 未知

    公开(公告)号：FR2416272A1

    公开(公告)日：1979-08-31

    申请号：FR7803726

    申请日：1978-02-03

    Applicant: SERVIMETAL

    Inventor： OLIVIER JACQUES ,  MANOIR PIERRE DU ,  GUERIT PIERRE ,  POLLET GILBERT

    IPC: C23C8/40 ,  C23C9/00

    Abstract: In a method of diffusing one or more elements into a metal surface by immersing the metal in a fused salt bath into which the element(s) is introduced as a compound in the gaseous or vapour state or is liberated by pyrolyis of the cpd., the cpd. introduced in admixture with an inert gas in the form of fine bubbles. The method is es. useful for carburising, nitriding, carbonitriding, sulphidising or boridising steel and other metals such as Ti and Zr. It avoids toxic cpds. (cyanides) in the bath, makes use of molten alkali (ne earth) halides which are removed easily from metal surfaces, improves control of carburising potential, gives surface hardnesses of >700 HV in small steel components after oil quenching, consumes less of the diffusing element, has low investment and maintenance costs, avoids salt regeneration and solid waste disposal problems, and gives more flexible operation (e.g. preheating and surface diffusion can be carried out in the same bath as well as successive different surface diffusion processes). Residual carbon in the bath, can be easily removed, e.g. by passing air or oxygen through the bath.

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