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    1.
    发明专利
    未知

    公开(公告)号：DE69505842D1

    公开(公告)日：1998-12-10

    申请号：DE69505842

    申请日：1995-11-29

    Applicant: FRAMATOME SA ,  COGEMA

    Inventor： HERTZ DOMINIQUE ,  BELMONTE THIERRY ,  GAVILLET JEROME ,  MICHEL HENRI

    IPC: G21C3/06 ,  C23C16/02 ,  C23C16/40 ,  C23C16/452 ,  G21C3/326 ,  G21C3/34 ,  C23C16/44 ,  G21C3/00

    Abstract: PCT No. PCT/FR95/01576 Sec. 371 Date Oct. 28, 1997 Sec. 102(e) Date Oct. 28, 1997 PCT Filed Nov. 29, 1995 PCT Pub. No. WO96/17105 PCT Pub. Date Jun. 6, 1996Surface preoxidation of the substrate is carried out by bringing the substrate into contact with an oxidizing gas excited by a cold plasma, the substrate being situated in the flowing afterglow of the cold plasma used to excite the oxidizing element and being heated to an oxidation temperature of less than 500 DEG C. A metal oxide is formed at the surface of the preoxidized substrate by heterogeneous oxidation of a metal halide with a gas mixture including an oxidizing element activated by a cold plasma. The oxidizing gas mixture is brought into contact with the halide as directly as possible in the vicinity of the substrate arranged in the far flowing afterglow of the cold plasma. The cold plasma is preferably generated by microwaves. The process can be used in particular for producing a protective coating on a cladding tube of a nuclear fuel rod.

    4.
    发明专利
    未知

    公开(公告)号：FR2727691A1

    公开(公告)日：1996-06-07

    申请号：FR9414466

    申请日：1994-12-01

    Applicant: FRAMATOME SA

    Inventor： HERTZ DOMINIQUE ,  BELMONTE THIERRY ,  GAVILLET JEROME ,  MICHEL HENRI

    IPC: G21C3/06 ,  C23C16/02 ,  C23C16/40 ,  C23C16/452 ,  G21C3/326 ,  G21C3/34 ,  C23C16/08 ,  G21C3/07

    Abstract: A superficial preoxydation of the substrate (2) is effected by placing it in contact with an oxidant gas excited by a cool plasma of the substrate (2) situated in the flow post-discharge of the cool plasma used to the oxidant element and heated to an oxidation temperature lower than 500 DEG C. At the surface of the preoxidized substrate (2), a metal oxide is provided by heterogenous oxidation of a metal halide by using a gas mixture comprising an oxidant element activated by a cool plasma. The oxidant gas mixture is set in contact with the halide at the closest vicinity of the substrate arranged in the remote flow post-discharge of the cool plasma. Preferably, the cool plasma is generated by micro-waves. The process may be used particularly for forming a protection coating on a casing tube of a nuclear fuel rod.

    5.
    发明专利
    未知

    公开(公告)号：DE69505842T2

    公开(公告)日：1999-04-29

    申请号：DE69505842

    申请日：1995-11-29

    Applicant: FRAMATOME SA ,  COGEMA

    Inventor： HERTZ DOMINIQUE ,  BELMONTE THIERRY ,  GAVILLET JEROME ,  MICHEL HENRI

    IPC: G21C3/06 ,  C23C16/02 ,  C23C16/40 ,  C23C16/452 ,  G21C3/326 ,  G21C3/34 ,  C23C16/44 ,  G21C3/00

    Abstract: PCT No. PCT/FR95/01576 Sec. 371 Date Oct. 28, 1997 Sec. 102(e) Date Oct. 28, 1997 PCT Filed Nov. 29, 1995 PCT Pub. No. WO96/17105 PCT Pub. Date Jun. 6, 1996Surface preoxidation of the substrate is carried out by bringing the substrate into contact with an oxidizing gas excited by a cold plasma, the substrate being situated in the flowing afterglow of the cold plasma used to excite the oxidizing element and being heated to an oxidation temperature of less than 500 DEG C. A metal oxide is formed at the surface of the preoxidized substrate by heterogeneous oxidation of a metal halide with a gas mixture including an oxidizing element activated by a cold plasma. The oxidizing gas mixture is brought into contact with the halide as directly as possible in the vicinity of the substrate arranged in the far flowing afterglow of the cold plasma. The cold plasma is preferably generated by microwaves. The process can be used in particular for producing a protective coating on a cladding tube of a nuclear fuel rod.

    6.
    发明专利
    未知

    公开(公告)号：FR2743088A1

    公开(公告)日：1997-07-04

    申请号：FR9515582

    申请日：1995-12-27

    Applicant: FRAMATOME SA

    Inventor： HERTZ DANIEL ,  BELMONTE THIERRY ,  MICHEL HENRI ,  PIERSON JEAN FRANCOIS

    IPC: C23C16/02 ,  C23C16/38 ,  C23C16/452 ,  G21C3/18 ,  C23C16/08 ,  G21C3/07 ,  G21C3/20

    Abstract: A surface preoxidation of the substrate (5) is carried out by placing the substrate in contact with an oxidant gas excited in a cold plasma, the substrate (5) being placed in the post-discharge of the plasma flow and heated to a temperature lower than 480 DEG C. At a temperature lower than 500 DEG C, metal boride is deposited on the preoxidized substrate (5). The deposition of boride is obtained by placing in contact with each other and with the substrate (5) a metal halide, a boron compound and a reducer element, in the form of gas substances. At least one of the gas substances is excited in a cold plasma. The process is particularly intended to coat the internal surface or the external surface of the lining tube of zirconium alloy with a zirconium boride layer which absorbes the neutrons.

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