[go: up one dir, main page]

GB2208875A - Depositing surface layers using ion beans - Google Patents

Depositing surface layers using ion beans Download PDF

Info

Publication number
GB2208875A
GB2208875A GB8819752A GB8819752A GB2208875A GB 2208875 A GB2208875 A GB 2208875A GB 8819752 A GB8819752 A GB 8819752A GB 8819752 A GB8819752 A GB 8819752A GB 2208875 A GB2208875 A GB 2208875A
Authority
GB
United Kingdom
Prior art keywords
substrate
ion
source
chamber
lens
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8819752A
Other versions
GB8819752D0 (en
Inventor
John Alan Stevenson
Robert Hill
Russell Bruce Horney
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SCIENT COATINGS
Original Assignee
SCIENT COATINGS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SCIENT COATINGS filed Critical SCIENT COATINGS
Publication of GB8819752D0 publication Critical patent/GB8819752D0/en
Publication of GB2208875A publication Critical patent/GB2208875A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/221Ion beam deposition
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10NELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00Superconducting devices
    • H10N60/01Manufacture or treatment
    • H10N60/0268Manufacture or treatment of devices comprising copper oxide
    • H10N60/0296Processes for depositing or forming copper oxide superconductor layers
    • H10N60/0548Processes for depositing or forming copper oxide superconductor layers by deposition and subsequent treatment, e.g. oxidation of pre-deposited material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physical Vapour Deposition (AREA)

Abstract

Apparatus which may be used to form on a substrate a layer containing two or more elemental or molecular components as illustrated in the figure comprises a reduced-pressure chamber 1, vacuum means for reducing the pressure in the chamber, a support in the chamber for the substrate, a plurality of ion sources 3, 4, 5 and a beam-controlling lens, which may be a magnetic or an electrostatic lens, for each ion source 9, 10, 11, to direct and focus the ion beams on to a common zone of the substrate. Single or multiple layered products may be produced using this apparatus. The ion source may be a solid source of ions, a plasma source, a Freeman source or a saddle source. The apparatus may include a laser unit 12 which produces a laser beam which is used to modify the crystal structure of the depositing layer or to etch the deposited material after its formation. The lenses may have ion accelerating facilities and the substrate may be given an electrical bias. The apparatus may be adapted to feed a continuous substrate therethrough. The ion beams may trace a path over the surface of a fixed substrate. The specific examples describe the formation of layers comprising the elements La, Sr, Cu and oxygen in different proportions (La1.85Sr0.15CuO4) using sources of La, Sr, and Cu ions in an oxygen atmosphere and layers containing the elements Y, Ba, Cu and O which function as superconductors. The substrate may be flat steel or copper wire. <IMAGE>

Description

Apparatus and Method for Depositing Surface Layers on Substrates.
The present invention is concerned with the deposition of surface layers on substrates and comprises apparatus and a method for that purpose. It is particularly suitable for the deposition of layers consisting of alloys or other combinations of two or irore elements.
Surface layers may be applied to substrates for a range of different purposes where the objective is to enhance the surface properties of the substrate. Among such purposes is to increase the hardness and/or the wear-resistance or corrosionresistance of the substrate or simply to modify its appearance.
A wide range of materials may be deposited, including metals and their alloys and a variety of chemical compounds including oxides, nitrides and mixtures of compounds. To effect deposition of these diverse materials for different purposes, a variety of processes and associated apparatus have been developed.
By way of example, a layer of titanium nitride may be formed by generating titsni#rn ions in a nitrogen atmosphere so as to produce titanium nitride will the surface of the substrate.
In an alternative process, the material to be deposited is produced within the deposition chamber at a very high temperature by dissociation of the appropriate gaseous reactants, the new product thus formed by chemical reaction being subsequently deposited on the chosen substrate.
While presently available deposition processes have many advantages, which differ from one process to another, they also suffer fratn various limitations. For example, when it is desired to deposit a layer comprising two or more oumponents, very tight control of all process variables is essential for some processes if a layer of the desired composition is to be reliably and consistently produced.
It is an object of the present invention to provide an improved apparatus and method for depositing surface layers on substrates, whereby some at least of the disadvantages and/or limitations of existing such apparatus and methods may be reduced or eliminated, in particular in the deposition of layers containing two or more elemental or molecular components.
The apparatus according to the invention caprices a chamber adapted to sustain a substantially reduced pressure therein, vacuum means for reducing the pressure in said chamber, a support within the chamber for a substrate upon which the surface layer is to be deposited, a plurality of ion sources and a plurality of beam-controlling lenses, each lens being disposed to direct a beam of ions from one of said ion sources on to a common zone of the surface of a substrate upon said support.
The process according to the invention, for forming upon the surface of a substrate a layer containing two or more elemental or molecular con}cnents, comprises generating a plurality of berms, each consisting of different ions, and directing said ion beams simultaneously to a common zone of the surface of said substrate.
It will be seen that an important characteristic feature of the apparatus and method according to the present invention is the simultaneous arrival at or adjacent to the substrate surface of ions from at least two difference sources, the different ions being the components which together make up the desired deposited surface layer. Thus reaction to form a coating compound or compounds, or mixing to form an alloy layer, occurs wholly or largely in the region adjacent to the substrate surface.Not only does this make it possible to carry out the deposition under high vacuum rather than within a gaseous ah~sphere, it also affords maximum facility for controlling, and indeed varying, the composition of the deposited layer.
Although the apparatus of the present invention includes a plurality of ion sources and associated lenses, it may, of course, still be used when desired to deposit ions of a single species, when a single-cczDDnent layer is required. In the same way, although the apparatus has the facility for carrying out deposition under high vacuum, it may still be operated with a gaseous atmosphere, especially a low-pressure atmosphere, within the deposition chamber, for example when it is desired to supply one of the components of the layer in the form of a gaseous reactant.
The ion sources which are a feature of the apparatus of the invention may tak~ many different forms. Such sources include solid sources of ions such as the arc source and also include plasma sources, Freeman sources and saddle sources. The sources employed in a given apparatus may be of the same or different types. For example, at least one component of the layer may be derived from a solid ion source and at least one from a gaseous source.
For each ion source, a separate lens system is provided, to direct the associated ion beam on to the substrate. lenses for this purpose are of magnetic and/or electrostatic type, by means of which the ions in the beam are accelerated or diverted and the beam is directed or focused. In general, it is highly desirable to include an ion accelerating facility in each lens system, not only because accelerated ions tend to yield better structural characteristics in the resulting surface layer but also because a facility for varying the energy of the ions by varying the acceleration applied affords greatly inprcved control over the deposition process generally.
The lens systems preferably also include features for focusing the beams on to a closely-defined area of the substrate, although the size of the area will vary depending upon the nature and intended function of the surface layer being produced. For example, if the layer is to form a narrow conducting path as a part of a microelectronic component, then the beams may need to be focused to a fine point on the surface of the substrate.
The combined beams may then trace a desired path over the substrate surface, either by moving the substrate, for example continuously over a linear path within or through the deposition chamber, or by diverting the beams in a predetermined controlled way over a stationary or moving substrate. As an alternative, it may be desired to form a layer over a less tightly defined area or indeed over the whole exposed surface of an article forming the substrate. In such circumstances precise focusing of the ion beams may be unnecessary or undesirable. If this is the case, then a conductive substrate may be given an electrical bias to attract ions in the beams to the substrate surface.
In yet another possible application, a laser may be included in the apparatus, whereby a laser beam may be directed on to the substrate surface, to influence the properties of the layer during its formation or selectively to remove by vaporisation selected parts of the layer when it has been formed.
The use of a plurality of separate ion sources, especially in omibination with accelerator features of the lens systems, gives a high degree of control over the composition and other characteristics of the surface layer formed. Not only is it possible to set in adzuice with a high degree of precision the composition of the deposited layer; it is also possible to vary, uniformly or in steps, the composition of the layer either across the substrate surface or through the thickness of the layer in a direction perpendicular to the substrate surface.
The substrate itself may take any manageable form. Thus it may be one or more discrete articles remainIng stationary in a vacuum chamber throughout the deposition operation.
Equally, the invention lends itself to the deposition of a layer in a continuous operation upon a continuous substrate, for example a tape, wire or rod. The latter type of substrate may be fed continuously into and out of the deposition chamber through suitable vacuum seals, or the vacuum may be maintained in the chamber by differential pumping. Such a continuous substrate may be subjected to further continuous treatment in a subsequent operation; for example it may pass fran the deposition chamber to a machine for providing a continuous sheath about the article or for drawing or otherwise shaping the product.
It will be seen that the apparatus and met'nod according to the invention may be used to produce a very wide range of products.
Among many other possibilities, it is suitable for the formation of single or laminated layers of alloys of metals and alloys of other compounds, for example upon wire substrates or upon non-oonductive supports. One particular application envisaged is the formation of alloys of mixed oxides of alkaline earth and/or transition metals upon wire substrates, e.g. of copper, to form a product functiai:ng as a superconductor.
The invention will nova be further described and exemplified with reference to the accopanying drawing, which illustrates in a highly schematic form one embodiment of the apparatus according to the invention.
Referring to the drawing, the illustrated apparatus comprises a vacuum chamber 1 in the form of an extended cylindrical pressure vessel seen in radial cross-section. An elongated substrate 2 in the form of a flat tape passes axially through the chamber 1, entering and leaving the chamber through aligned vacuum seals (not shown). Three separate ion sources 3, 4 and 5 are individually linked to the chamber 1 by beam tubes 6, 7 and 8 respectively.
The ion beams generated in the ion sources each pass through a magnetic or electrostatic lens (9, 10 and 11 respectively), by means of which the beams are accelerated and focused upon a osmman point on the surface of the substrate 2, at which point the beams converge and the ions combine and form a layer on the substrate.
The box designated by the reference numeral 12 signifies a laser unit, which is an optional feature of the apparatus and which in selected applications may be employed to produce a laser beam, either directed at the point on the substrate upon which the ion beams are focused (to modify the crystal structure of the layer as it is formed) or used to etch or otherwise selectively remove the deposited layer after its formation.
The invention is further illustrated by means of the following Examples,which describe one #td#rrent of the process according to the invention.
EKarr#p1es In the apparatus illustrated in the drawing, layers comprising the elements lanthanum, strontium, copper and oxygen in different proportions were formed upon several substrates, each in the form of a flat steel substrate. In each case, the lanthanum, strontium and copper ions were produced in arc evaporators using the elements in the form of solid discs. An oxygen atmosphere at a pressure lying within the range from 10 -4 to 5 x 10-2 millibar was maintained in the vacuum chamber. The substrate was maintained at a negative potential of 0 to 800 volts with respect to the chamber, the voltage being varied during the formation of the layer to keep the temperature of the substrate below a preselected upper value in the range from 400 to 1000 C.
In one specific example, in which the oxygen pressure was maintained at 10-3 millibar, the negative potential on the substrate was initially 200 volts and was varied to keep the temperature of the substrate below 400 C. A layer of an alloy having a composition corresponding to the empirical formula La.1.85 Sr0.15 Cu 04 was Cbtaied.
In further analogous examples, layers were produced containing the elements yttrium, barium, copper and oxygen.

Claims (16)

1. Apparatus for forming upon the surface of a substrate a layer containing two or more elemental or molecular components, which apparatus comprises a chamber adapted to sustain a substantially reduced pressure therein, vacuum means for reducing the pressure in said chamber, a support within the chamber for a substrate upon which the surface layer is to be deposited, a plurality of ion sources and a plurality of beam-controlling lenses, each lens being disposed to direct a beam of ions from one of said ion sources on to a commDn zone of the surface of a substrate upon said support.
2. Apparatus as claimed in claim 1, wherein each ion source comprises a solid source of ions, a plasma source, a Freeman source or a saddle source.
3. Apparatus as claimed in either of the preceding claims, wherein each lens is a magnetic or an electrostatic lens.
4. Apparatus as claimed in any of the preceding claims, wherein each lens incloses an ion accelerating facility.
5. Apparatus as claimed in any of the preceding claims, wherein each lens is adapted to focus the associated ion beam to a closelydefined area of the substrate.
6. Apparatus as claimed in any of the preceding claims, including means to effect relative movement of the ion beams and the substrate.
7. Apparatus Rs claimed in any of the preceding claims, including a ~2ser adapted to direct a laser beam on to the surface of a substrate upon the support.
8. Apparatus as claimed in any of the preceding claims, including mEans to feed a continuous substrate through said chamber.
9. A process for forming upon the surface of a substrate a layer containing two or itore elemental or molecular components, which process comprises generating a plurality of beams, each consisting of different ions, and directing said ion beams simdltaneously to a ooooon zone of the surface of the substrate.
10. A process as claimed in claim 9, wherein the ion beams together trace a path over the surface of a fixed substrate.
11. A process as claimed in claim 9, wherein the substrate is moved continuously through said ion beams.
12. A process as claimed in claim 11, wherein the substrate is subjected to further continuous treatment in a subsequent operation.
13. A process as claimed in any of claims 9 to 12, wherein the substrate is electrically conductive and is given an electrical bias.
14. A process as claimed in any of claims 9 to 13, wherein a laser beam is directed on to the substrate surface during or subsequent to the forming of the layer thereon.
15. Apparatus for forming upon the surface of a substrate a layer containing two or rttre elemental or molecular components, said apparatus being substantially as hereinbefore described with reference to, and as illustrated in, the accoçanying drawing.
16. A process for forming upon the surface of a substrate a layer containing two or mDre elemental or molecul@r components, said process being substantially as hereinbefore described in the foregoing Example.
GB8819752A 1987-08-21 1988-08-19 Depositing surface layers using ion beans Withdrawn GB2208875A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB878719794A GB8719794D0 (en) 1987-08-21 1987-08-21 Depositing surface layers on substrates

Publications (2)

Publication Number Publication Date
GB8819752D0 GB8819752D0 (en) 1988-09-21
GB2208875A true GB2208875A (en) 1989-04-19

Family

ID=10622612

Family Applications (2)

Application Number Title Priority Date Filing Date
GB878719794A Pending GB8719794D0 (en) 1987-08-21 1987-08-21 Depositing surface layers on substrates
GB8819752A Withdrawn GB2208875A (en) 1987-08-21 1988-08-19 Depositing surface layers using ion beans

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB878719794A Pending GB8719794D0 (en) 1987-08-21 1987-08-21 Depositing surface layers on substrates

Country Status (1)

Country Link
GB (2) GB8719794D0 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5658389A (en) * 1989-06-29 1997-08-19 Kabushiki Kaisha Toshiba Thin film forming method and apparatus
US5776253A (en) * 1993-10-14 1998-07-07 Neuralsystems Corporation Apparatus for forming single-crystalline thin film by beam irradiator and beam reflecting device
US5797987A (en) * 1995-12-14 1998-08-25 Ppg Industries, Inc. Zinc phosphate conversion coating compositions and process
RU2120680C1 (en) * 1996-07-29 1998-10-20 Институт ядерной физики СО РАН Method for implanting particles in solid body
WO2001061066A1 (en) * 2000-02-17 2001-08-23 Anatoly Nikolaevich Paderov Protective coating method for pieces made of heat resistant alloys
RU2264480C2 (en) * 2000-04-10 2005-11-20 Падеров Анатолий Николаевич Method of deposition of protective coatings on details made out of refractory alloys
US7229675B1 (en) 2000-02-17 2007-06-12 Anatoly Nikolaevich Paderov Protective coating method for pieces made of heat resistant alloys

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115572950B (en) * 2022-10-14 2024-07-16 苏州岚创科技有限公司 Multi-ion source synchronous sputtering coating device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1089967A (en) * 1964-12-28 1967-11-08 Hermsdorf Keramik Veb Improvements in or relating to arrangements for the manufacture of electronic components comprising thin films
US4346301A (en) * 1979-07-30 1982-08-24 Hughes Aircraft Company Ion implantation system
EP0061906A1 (en) * 1981-03-26 1982-10-06 Inoue-Japax Research Incorporated A method of, and an apparatus for, processing a workpiece with energetic particles and a product processed thereby
EP0062818A1 (en) * 1981-03-30 1982-10-20 Asahi Kasei Kogyo Kabushiki Kaisha Process of producing a Hall element or magnetoresistive element comprising an indium-antimony complex crystal semiconductor
EP0107356A2 (en) * 1982-09-23 1984-05-02 Energy Conversion Devices, Inc. Compositionally varied materials and method and system for synthesizing the materials
GB2144151A (en) * 1983-07-27 1985-02-27 American Telephone & Telegraph Method of selective area epitaxial growth
WO1987000966A1 (en) * 1985-08-07 1987-02-12 The Commonwealth Of Australia Control of uniformity of growing alloy film
GB2181747A (en) * 1985-09-11 1987-04-29 Sharp Kk A molecular beam epitaxial growth apparatus
WO1987002713A1 (en) * 1985-10-31 1987-05-07 Ncr Corporation A method for forming an abrasion resistant coating on a transparent substrate
GB2194555A (en) * 1986-07-31 1988-03-09 Nippon Telegraph & Telephone Method of manufacturing thin compound oxide film and apparatus for manufacturing thin oxide film

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1089967A (en) * 1964-12-28 1967-11-08 Hermsdorf Keramik Veb Improvements in or relating to arrangements for the manufacture of electronic components comprising thin films
US4346301A (en) * 1979-07-30 1982-08-24 Hughes Aircraft Company Ion implantation system
EP0061906A1 (en) * 1981-03-26 1982-10-06 Inoue-Japax Research Incorporated A method of, and an apparatus for, processing a workpiece with energetic particles and a product processed thereby
EP0062818A1 (en) * 1981-03-30 1982-10-20 Asahi Kasei Kogyo Kabushiki Kaisha Process of producing a Hall element or magnetoresistive element comprising an indium-antimony complex crystal semiconductor
EP0107356A2 (en) * 1982-09-23 1984-05-02 Energy Conversion Devices, Inc. Compositionally varied materials and method and system for synthesizing the materials
GB2144151A (en) * 1983-07-27 1985-02-27 American Telephone & Telegraph Method of selective area epitaxial growth
WO1987000966A1 (en) * 1985-08-07 1987-02-12 The Commonwealth Of Australia Control of uniformity of growing alloy film
GB2181747A (en) * 1985-09-11 1987-04-29 Sharp Kk A molecular beam epitaxial growth apparatus
WO1987002713A1 (en) * 1985-10-31 1987-05-07 Ncr Corporation A method for forming an abrasion resistant coating on a transparent substrate
GB2194555A (en) * 1986-07-31 1988-03-09 Nippon Telegraph & Telephone Method of manufacturing thin compound oxide film and apparatus for manufacturing thin oxide film

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WO87/00966 A1 is equivalent to GB2192902 A *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5658389A (en) * 1989-06-29 1997-08-19 Kabushiki Kaisha Toshiba Thin film forming method and apparatus
US5776253A (en) * 1993-10-14 1998-07-07 Neuralsystems Corporation Apparatus for forming single-crystalline thin film by beam irradiator and beam reflecting device
US5795385A (en) * 1993-10-14 1998-08-18 Neuralsystems Corporation Method of forming single-crystalline thin film by beam irradiator
US6032611A (en) * 1993-10-14 2000-03-07 Neuralsystems Corporation Apparatus for forming single-crystalline thin film by beam irradiator and beam reflecting device
US5797987A (en) * 1995-12-14 1998-08-25 Ppg Industries, Inc. Zinc phosphate conversion coating compositions and process
RU2120680C1 (en) * 1996-07-29 1998-10-20 Институт ядерной физики СО РАН Method for implanting particles in solid body
WO2001061066A1 (en) * 2000-02-17 2001-08-23 Anatoly Nikolaevich Paderov Protective coating method for pieces made of heat resistant alloys
US7229675B1 (en) 2000-02-17 2007-06-12 Anatoly Nikolaevich Paderov Protective coating method for pieces made of heat resistant alloys
RU2264480C2 (en) * 2000-04-10 2005-11-20 Падеров Анатолий Николаевич Method of deposition of protective coatings on details made out of refractory alloys

Also Published As

Publication number Publication date
GB8819752D0 (en) 1988-09-21
GB8719794D0 (en) 1987-09-30

Similar Documents

Publication Publication Date Title
US5215638A (en) Rotating magnetron cathode and method for the use thereof
Gautherin et al. Some trends in preparing film structures by ion beam methods
CA2411174C (en) A process and apparatus for plasma activated deposition in a vacuum
US6035805A (en) Method and apparatus for vacuum deposition of highly ionized media in an electromagnetic controlled environment
US5736073A (en) Production of nanometer particles by directed vapor deposition of electron beam evaporant
US5534314A (en) Directed vapor deposition of electron beam evaporant
US3409529A (en) High current duoplasmatron having an apertured anode comprising a metal of high magnetic permeability
US5158933A (en) Phase separated composite materials
US20090314633A1 (en) Electron beam enhanced large area deposition system
GB2208875A (en) Depositing surface layers using ion beans
US4861750A (en) Process for producing superconducting thin film
US5168097A (en) Laser deposition process for forming an ultrafine-particle film
EP0265886B1 (en) Process for forming an ultrafine-particle film
EP0285999B2 (en) A production method of superconductive thin film and a device thereof
US4882023A (en) Method and system for producing thin films
JPH04318168A (en) Ion composite cvd method and device therefor
US5841236A (en) Miniature pulsed vacuum arc plasma gun and apparatus for thin-film fabrication
Smidt et al. Recent advances in ion beam modification of metals
Musil et al. Hard coatings prepared by sputtering and arc evaporation
JP2002097569A (en) Surface processing method in vacuum
JPS6141706A (en) Manufacture of hyperfine particle
EP0298933A2 (en) Method for the manufacture of copper oxide superconducting films
CA2016028A1 (en) Method of fabricating oxide superconducting film
JP2600092B2 (en) Surface modification method for metallic materials
JPH0372069A (en) Method for continuously vapor-depositing compound on metal strip

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)