EP0326785B1 - Folienartiges Metallband - Google Patents

Folienartiges Metallband Download PDF

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Publication number
EP0326785B1
EP0326785B1 EP88810837A EP88810837A EP0326785B1 EP 0326785 B1 EP0326785 B1 EP 0326785B1 EP 88810837 A EP88810837 A EP 88810837A EP 88810837 A EP88810837 A EP 88810837A EP 0326785 B1 EP0326785 B1 EP 0326785B1
Authority
EP
European Patent Office
Prior art keywords
melt
strip
hard particles
solidification
alloy
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.)
Expired - Lifetime
Application number
EP88810837A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0326785A1 (de
Inventor
Hans-Walter Dr. Schläpfer
Bruno Sonderegger
Werner Straub
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.)
Sulzer AG
Original Assignee
Gebrueder Sulzer AG
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 Gebrueder Sulzer AG filed Critical Gebrueder Sulzer AG
Publication of EP0326785A1 publication Critical patent/EP0326785A1/de
Application granted granted Critical
Publication of EP0326785B1 publication Critical patent/EP0326785B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12431—Foil or filament smaller than 6 mils
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12486—Laterally noncoextensive components [e.g., embedded, etc.]

Definitions

  • the invention relates to a foil-like metal strip with inclusions of hard particles in a metal matrix composed of at least one element from Group VIIIA, at least one element from Groups IVA, VA or VIA and at least one of the elements boron, carbon, silicon and phosphorus, the hard particles being the primary excretions from the melt are predominantly arranged near one surface of the metal strip, the thickness of the strip also being a maximum of 1 mm, and a cooling rate of at least 10 2 K / sec has been observed during its production from the melt.
  • Boron, carbon, silicon and phosphorus act in a known manner as glass formers; their effect can be enhanced by an optional addition of sulfur, gallium, germanium, arsenic, tin and / or antimony.
  • a metal strip of the type described above is known from EP-A-2 785.
  • the melt from which the strip is made becomes hard particles - for example metal borides, carbides or -oxides - added in granular form and embedded in the solidified metal matrix of the tape; however, the hard particles can also pass through chemical reactions of individual components of the melt can be obtained directly as primary excretions.
  • the object of the invention is to improve the adhesion of hard particles in the metal matrix of the belt.
  • this object is achieved in that at least 50% of the hard particles have an elongated crystal shape with a length to width ratio of at least 5.
  • hard particles preferably accumulate in the new tape on the free surface of the glassy or microcrystalline solidified tape; there they form a rough surface.
  • the main areas of application for the new metal belt are its use as abrasive or emery "paper” or as an abrasive coating on files and cutting discs, where it can be used as a replacement for diamond tools, for example.
  • Another area of application is, for example, the use as an adhesive layer for adhesives, for example for clutch linings.
  • the new tape is also possible to use the new tape as a flexible tape for welding coatings or as a starting material for laser coatings.
  • it can also be used to manufacture hard material powders can be obtained by dissolving the metal matrix.
  • the surface provided with the deposits has a rough structure with protruding tips which contain at least almost 100% hard particles.
  • a process for the production of the new strip is characterized in that in the separate production of the master alloy, the melt metallurgical parameters - such as the melt atmosphere, chemical composition, overheating of the melt before casting, casting temperature and / or solidification speed - are selected so that the hard particles are already separated Eliminate from the melt when the master alloy solidifies, and that a maximum value for an empirically determined energy influence on the melt of the remelted master alloy, which is a function of the melt temperature and the time until the melt solidifies, is also observed during the strip production, for which maximum value Re-dissolution of the hard particles is prevented at least in part.
  • the melt metallurgical parameters - such as the melt atmosphere, chemical composition, overheating of the melt before casting, casting temperature and / or solidification speed - are selected so that the hard particles are already separated Eliminate from the melt when the master alloy solidifies, and that a maximum value for an empirically determined energy influence on the melt of the remelted master alloy, which is a function of the melt temperature and the time until
  • the "energy influence" to be considered in the manufacturing process is a relatively complex function of the temperature of the remelted master alloy melt and the time during which the master alloy is in the liquid phase.
  • the complexity of the functional relationship between the two sizes requires this "energy influence” for the production of a tape according to the invention in preliminary tests - for each tape composition and for different particle sizes of the embedded ones Hard particles again - to be determined empirically; this results in a relationship such that only relatively short times are required for a specific dissolution of the hard particle crystals in a given metal matrix at relatively high melt temperatures or relatively long times at relatively low temperatures.
  • the "energy influence” can be described vividly as the ability of the remelted liquid phase to dissolve the hard particles stored in it.
  • the size of the hard particles and thus the roughness of the free strip surface can be controlled by variations in the rate of solidification during the production of the master alloy and / or the strip, the solidification of the master alloy essentially due to the material and diameter of the casting molds and the strip rigidity primarily due to its Speed on the heat-dissipating centrifugal wheel or belt can be influenced.
  • the peripheral speed of the wheel can vary between 500 and 3000 (m / min).
  • the master alloy is advantageously melted and re-melted in a protective gas atmosphere, for example in an argon (Ar) atmosphere, before the strip is manufactured.
  • a protective gas atmosphere for example in an argon (Ar) atmosphere
  • the master alloy can be produced under a reduced pressure.
  • the melt whose liquidus temperature has been measured at around 1380 ° C, is heated to a temperature of around 1540 ° C before casting, which corresponds to an overheating of around 160 ° C.
  • the master alloy melt is then poured into molds, and during solidification, in addition to the precipitation of the hard particles, a eutectic-like residual melt with a solidus point of approximately 1060 ° C. is formed.
  • the size of the hard particles separated from the melt which in the present case mainly consist of zeta-chromium boride (-CrB), depends on the rate of solidification of the master alloy - and can therefore be changed to a certain extent by varying the setting time - this is used for one desired particle size of the hard material deposits optimal solidification rate experimentally determined in preliminary tests.
  • the rate of solidification depends primarily on the material and / or lining of the mold, as well as on its diameter.
  • the casting takes place at a temperature of about 1420 ° C, for example in a copper mold with a diameter of 20-24 mm, it solidifies in 3-5 seconds at a cooling rate of 103 ° C / min reached, whereby hard particle precipitates of about 10-20 microns in length are formed.
  • zirconium oxide ZrO2
  • the hard particles essentially separate out as crystals with a length of about 0.3 mm, these crystals having internal cavities, incisions, corners and edges.
  • the metal strip is produced from the master alloy interspersed with hard material precipitates in a known melt spinning device.
  • the master alloy is melted again in a quartz glass nozzle, which is arranged above a centrifugal wheel made of a heat-conducting material, for example a heat-hardenable copper-chromium alloy, with the aid of an induction coil surrounding the nozzle, with bath movements of the melt surface tensions and relatively low temperatures in the region of the open Prevent the melt from flowing out of the nozzle.
  • the heating time is chosen so that the solidus point of the alloy of, as mentioned, about 1060 ° C. is reached after about 4.5 minutes, the quartz glass tube being flushed with argon while heating up to about 950 ° C.
  • a certain holding time is required after the remelting before a band can be produced from the remelted master alloy.
  • This holding time depends on the "energy influence" explained above and can be 1 to a maximum of 5 minutes.
  • the empirically determined energy influence has shown that in the present Example when remelting the master alloy - after the eutectic-like residual melt is completely in liquid form again - a holding time of the melt of about 1 min is still permissible.
  • the remelted master alloy is "shot" by a pressure surge of argon at 0.25 bar overpressure on the melt surface against the centrifugal wheel; its speed or circumferential speed influences the solidification time of the strip, whereby relatively high speeds lead to strips with relatively coarse and / or excretions from the strip plane and relatively low speeds lead to fine-grained and / or flat arranged hard material particles in the metal matrix, which result in present case contains a percentage of 3 - 10% zeta-chromium boride as hard material excretions.
  • centrifugal wheel free surface of the belt mean roughness values R a (DIN 4762) provide for the described embodiment, at peripheral speeds of about 1100 m / min on the side opposite the centrifugal wheel, in the longitudinal direction of the band from 2.2 to 2.8 microns and transversely thereto from 1.3 to 1.8 ⁇ m. If the circumferential speed of the wheel is increased to approximately 1300 m / min, the average roughness values R a are measured in the longitudinal direction from 100-130 ⁇ m and in the transverse direction from 60-100 ⁇ m.
  • the figure shows in a glass-like, amorphously solidified metal matrix 1, which, however, also at least partially can have microcrystalline structure, hard particles 2, the crystal shape of which can be described as skeletal.
  • microcrystals 3 made of hard materials can also be seen in the metallic base material.
  • the figure clearly shows tips 4 "occupied” with hard particle crystals, which are formed on the free surface of the strip 1 pointing upward in the figure, with in the example shown over 70% of the longitudinal dimension of the hard particles 2 in the metal matrix 1 are embedded.
  • the irregular shapes of the crystals 2 with internal cavities, incisions, corners and edges are the reason for the improved adhesion of the hard materials in the amorphous or microcrystalline structure of the metal strip.
  • the arrow indicated represents the direction in which the tape 1 was flung away from the melt spinning nozzle by the centrifugal wheel during its manufacture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Laminated Bodies (AREA)
EP88810837A 1988-02-01 1988-12-07 Folienartiges Metallband Expired - Lifetime EP0326785B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH341/88 1988-02-01
CH341/88A CH676471A5 (enrdf_load_html_response) 1988-02-01 1988-02-01

Publications (2)

Publication Number Publication Date
EP0326785A1 EP0326785A1 (de) 1989-08-09
EP0326785B1 true EP0326785B1 (de) 1992-04-08

Family

ID=4184806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810837A Expired - Lifetime EP0326785B1 (de) 1988-02-01 1988-12-07 Folienartiges Metallband

Country Status (6)

Country Link
US (1) US5061573A (enrdf_load_html_response)
EP (1) EP0326785B1 (enrdf_load_html_response)
JP (1) JP2695894B2 (enrdf_load_html_response)
CH (1) CH676471A5 (enrdf_load_html_response)
DE (1) DE3869943D1 (enrdf_load_html_response)
ES (1) ES2031629T3 (enrdf_load_html_response)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5494760A (en) * 1991-12-24 1996-02-27 Gebrueder Sulzer Aktiengesellschaft Object with an at least partly amorphous glass-metal film
DE4302521A1 (de) * 1993-01-29 1994-08-04 Linde Ag Metallisches Pulver für die Erzeugung von verschleißfesten Oberflächenschichten mittels einer thermischen Spritzmethode, Herstellungsverfahren und Spritzmethode dafür
DE59308613D1 (de) * 1993-04-02 1998-07-02 Sulzer Innotec Ag Werkzeug zum Schleifen von Brillengläsern
DE19605398A1 (de) * 1996-02-14 1997-08-21 Wielage Bernhard Prof Dr Ing Herstellen von Verbundwerkstoffen durch Bandgießen bzw. Gießwalzen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4268564A (en) * 1977-12-22 1981-05-19 Allied Chemical Corporation Strips of metallic glasses containing embedded particulate matter
US4786467A (en) * 1983-06-06 1988-11-22 Dural Aluminum Composites Corp. Process for preparation of composite materials containing nonmetallic particles in a metallic matrix, and composite materials made thereby
US4540546A (en) * 1983-12-06 1985-09-10 Northeastern University Method for rapid solidification processing of multiphase alloys having large liquidus-solidus temperature intervals
CA1220120A (en) * 1984-01-12 1987-04-07 Michael L. Santella Method for producing a metal alloy strip
US4800065A (en) * 1986-12-19 1989-01-24 Martin Marietta Corporation Process for making ceramic-ceramic composites and products thereof

Also Published As

Publication number Publication date
ES2031629T3 (es) 1992-12-16
CH676471A5 (enrdf_load_html_response) 1991-01-31
DE3869943D1 (de) 1992-05-14
EP0326785A1 (de) 1989-08-09
JPH01222032A (ja) 1989-09-05
US5061573A (en) 1991-10-29
JP2695894B2 (ja) 1998-01-14

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