EP0016006B1 - Chill casting of metal strip employing a molybdenum chill surface - Google Patents

Chill casting of metal strip employing a molybdenum chill surface Download PDF

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Publication number
EP0016006B1
EP0016006B1 EP79900571A EP79900571A EP0016006B1 EP 0016006 B1 EP0016006 B1 EP 0016006B1 EP 79900571 A EP79900571 A EP 79900571A EP 79900571 A EP79900571 A EP 79900571A EP 0016006 B1 EP0016006 B1 EP 0016006B1
Authority
EP
European Patent Office
Prior art keywords
chill
molybdenum
molten metal
flat
chill body
Prior art date
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Expired
Application number
EP79900571A
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German (de)
English (en)
French (fr)
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EP0016006A4 (en
EP0016006A1 (en
Inventor
Ranjan Ray
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.)
Honeywell International Inc
Original Assignee
Allied Corp
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Publication date
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Publication of EP0016006A4 publication Critical patent/EP0016006A4/en
Publication of EP0016006A1 publication Critical patent/EP0016006A1/en
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    • 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
    • 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
    • B22D11/005—Continuous casting of metals, i.e. casting in indefinite lengths of wire

Definitions

  • This invention relates to a method and apparatus for making amorphous metal strip by impinging molten metal onto the surface of a rapidly moving chill body.
  • the chill body may be flat, at least in a direction transverse to the direction of movement of the chill body, so that it can be a rotating wheel or travelling belt, usually an endless belt, and the molten metal is impinged onto the flat peripheral surface of the wheel or belt (see DE-A-2746238).
  • the surface of the chill body is disclosed in this reference as being of a metal of relatively high thermal conductivity such as copper, and the metal is impinged onto the surface of the chill body through a slotted nozzle located in close proximity to the chill surface, with the slot generally perpendicular to the direction of movement of the chill surface.
  • the surface of the chill body must meet several requirements.
  • Wear resistance is an extremely important aspect of chill body performance in the quench casting method since severe erosion of the chill surface usually results from a combination of factors, including the momentum of the impinging stream of molten metal in combination with the high temperature of the molten metal, but does not usually pose a problem in the pendant drop method.
  • High heat conductivity metals previously proposed to serve as chill body surface such as copper, aluminum, beryllium, copper or silver, do not have the wear characteristics required for satisfactory performance in the quench casting method.
  • the present invention further provides an improvement in the apparatus for making metal strip directly from the melt by impinging molten metal onto the flat surface of a rapidly moving chill body, which apparatus includes a chill body having a surface which is flat at least in the direction transverse to the direction of movement of the chill body, said surface being adapted to receive molten metal to be impinged thereon for rapid quenching to the solid state, and means functionally connected with said chill body for impinging molten metal onto its surface, wherein the improvement comprises providing a chill body having a surface of molybdenum.
  • the molybdenum chill surface is readily wetted by molten metal, especially by iron, nickel or cobalt-based alloys, which upon rapid quenching from the melt form amorphous structures.
  • the molybdenum surface further provides for good adhesion of the solidified metal strip, which is essential to effect thorough quenching of the metal if a ductile, amorphous metal strip is desired, yet it also affords clean release of the solidified strip from the surface.
  • the molybdenum surface has excellent wear-resistant properties as compared to chill surfaces previously used in the quench casting method.
  • chill bodies having a molybdenum surface in the process of making flat metal strip directly from the melt by impinging the molten metal onto the rapidly moving flat surface of a chill body are obtained regardless of the configuration of the chill body.
  • the chill body may be a rapidly rotating drum having a flat exterior surface which serves as the chill surface; it may be a rapidly rotating cylinder whereof the flat inrter surface furnishes the chill surface, a moving belt or any other suitable structure which provides a flat surface.
  • a flat strip is a slender body whose transverse dimensions are much less than its length, and whose thickness is much less than its width, typically having a width at least about ten times its thickness, and having smooth and even top and bottom surfaces which are generally parallel to each other.
  • a flat chill body surface is an endless surface provided by an endless belt, or the exterior or interior surface of a drum or cylinder, and which is smooth and even and which is straight in transverse direction, upon which a flat strip, as above-defined, may be cast.
  • Chill casting processes for making flat metal strip - polycrystalline as well as amorphous (glassy) metal strip - by impinging molten metal onto the flat surface of a rapidly moving chill surface of a heat extracting member (chill body) are well known. It has now been found that for use in such chill casting processes molybdenum has a desirable combination of properties required of a good chill surface, namely high melting point (2650°C); relatively low coefficient of thermal expansion (lower than that of copper); moderately high thermal conductivity (about 35% of that of copper); and moderately high hardness.
  • molybdenum has the required wetting properties for the molten metal and release properties for the solidified strip which, in combination with the aforementioned properties, make it eminently suitable for use as chill surface in quench casting of amorphous metal strips, especially ductile amorphous metal strips.
  • Most significant is the ability of molybdenum chill surfaces to resist erosion and wear by the impinging stream of molten metal, whether the casting takes place under vacuum or in a gaseous atmosphere, which may be air or a protective atmosphere such as nitrogen, helium and the like. This is in contrast to the presently employed copper chill surfaces.
  • refractory metals e.g., molybdenum, tungsten, chromium, hafnium, iridium, niobium, osmium, platinum, rhenium, rhodium, ruthenium, tantalum, thorium, vanadium, and zirconium.
  • a chill surface of molybdenum is particularly advantageous when casting under vacuum (say under absolute pressure of less than 1 in. Hg. (3.39 KPa)), or when casting glass-forming alloys containing one or more refractory metals, and especially when casting such alloys under vacuum.
  • the form of the chill body and the mode of the casting operation are not critical for purposes of the present invention, so long as a flat casting surface is provided.
  • casting may take place against the peripheral surface of a rapidly rotating drum by jetting molten metal against that surface, as disclosed in the above-mentioned patents to Bedell et al. and Kavesh.
  • the molten metal may be deposited under pressure from a slotted nozzle onto the flat chill surface, as described in US-A-4,142,571 to Narasimhan.
  • the chill surface may be furnished by the interior surface of a rotating cylinder, as described in US-A-3,881,540 to Kavesh and US ⁇ A ⁇ 3,881,542 to Polk et al., or as shown by Pond and Maddin in Trans. Met. Soc. AIME, 245 (1969) 2,475-6.
  • the chill surface of molybdenum may, in accordance with the present invention, be provided by fabricating the chill body of molybdenum, or by merely providing a surface layer of molybdenum on a chill body constructed of other material, suitably material having high thermal conductivity such as copper or silver.
  • Chill bodies made of molybdenum may be fabricated employing methods usually employed for fabrication of molybdenum, including machining from solid stock, such as cast pieces, or fabrication by known powder metallurgical methods.
  • a particularly desirable embodiment of the present invention is a composite chill body, especially a chill roll, made of copper provided with a hoop of molybdenum, as illustrated in Figs. 1 and 2. With reference to Fig. 1, chill roll 1 made of copper is mounted for rotation on shaft 2.
  • the flat exterior surface of chill roll 1 is provided with a hoop of molybdenum 3.
  • the hoop of molybdenum covers the total peripheral surface of the chill roll.
  • a narrower hoop of molybdenum 3 is provided covering only part of the peripheral surface of the chill roll.
  • the molybdenum hoop may be affixed to the copper chill roll, e.g. by shrink fitting.
  • a molybdenum surface may be provided by any other conventional surface coating method, as for example oxyacetylene spraying, a method which involves feeding a molybdenum wire into the cone of an oxygen/acetylene flame to melt the metal, and then propelling the molten metal in droplet form against the surface to be coated.
  • oxyacetylene spraying a method which involves feeding a molybdenum wire into the cone of an oxygen/acetylene flame to melt the metal, and then propelling the molten metal in droplet form against the surface to be coated.
  • suitable methods include plasma arc spraying and conventional cladding procedures.
  • Apparatus employed was similar to that depicted in Fig. 4 employing a chill roll of construction as shown in Fig. 2.
  • the chill roll had an outer diameter of 8 inches (20 cm), and its quench surface was 0.5 inches (1.3 cm) wide. It was rotated at a speed of about 2000 rpm.
  • the apparatus was enclosed in a vacuum chamber. All tests were conducted under vacuum of about 100 mm Hg (13 MPa).
  • a number of different glass forming alloys alloys which upon rapid quenching from the melt, at a rate in excess of about 10 4 to 1 05 °C/sec. form an amorphous solid structure (see, e.g. U.S.P. 3,856,513 to Chen and Polk) having melting points in excess of 1,500°C were cast by jetting the molten metal against the rotating chill surface through an orifice of 0.025 inch (0.6 mm) diameter under pressure of 5 psig (34 KPa). It was difficult to cast continuous ductile strips on the copper chill surface. In all cases the molten alloys attacked the copper chill surface, causing erosion, cracking and pitting.
  • Example 2 Following the general procedure of Example 1, 50 gram portions of molten, glass-forming alloy of the composition Fe 5 Ni 45 B 16 Mo 4 Cr 10 Co 20 (atom percent) were impinged (squirted) on to the flat peripheral surface of chill rolls of 8-12 in. (20 to 30 cm) diameter fabricated of different materials of construction and the quality of the strip (whether or not ductile, glassy metal strip was obtained), and chill surface wear and casting qualities were- visually observed. Results are summarized in Table 2, below.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP79900571A 1978-05-11 1979-05-04 Chill casting of metal strip employing a molybdenum chill surface Expired EP0016006B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US90494578A 1978-05-11 1978-05-11
US904945 1978-05-11
US2311979A 1979-03-23 1979-03-23
US23119 1979-03-23

Publications (3)

Publication Number Publication Date
EP0016006A4 EP0016006A4 (en) 1980-09-29
EP0016006A1 EP0016006A1 (en) 1980-10-01
EP0016006B1 true EP0016006B1 (en) 1983-05-11

Family

ID=26696754

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79900571A Expired EP0016006B1 (en) 1978-05-11 1979-05-04 Chill casting of metal strip employing a molybdenum chill surface

Country Status (5)

Country Link
EP (1) EP0016006B1 (enrdf_load_stackoverflow)
JP (1) JPH029900B2 (enrdf_load_stackoverflow)
CA (1) CA1151389A (enrdf_load_stackoverflow)
DE (1) DE2965347D1 (enrdf_load_stackoverflow)
WO (1) WO1979001054A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589471A (en) * 1984-10-29 1986-05-20 General Electric Company Method for rapid solidification of titanium alloys by melt extraction
US4842186A (en) * 1987-10-30 1989-06-27 The Babock & Wilcox Company Method and apparatus for building a workpiece by deposit welding
AT16355U1 (de) * 2017-06-30 2019-07-15 Plansee Se Schleuderring

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881540A (en) * 1973-10-29 1975-05-06 Allied Chem Method of forming metallic filament cast on interior surface of inclined annular quench roll

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3801540A (en) * 1961-10-30 1974-04-02 Geigy Ag J R Dialkylhydroxyphenylalkanoic acid esters of di-and tripentaerythritol useful as polymer antioxidants
US3896203A (en) * 1973-04-23 1975-07-22 Battelle Development Corp Centrifugal method of forming filaments from an unconfined source of molten material
GB1549124A (en) * 1976-05-04 1979-08-01 Allied Chem Chill roll castin of continuous filament
US4077462A (en) * 1976-06-30 1978-03-07 Allied Chemical Corporation Chill roll casting of continuous filament
AU503857B2 (en) * 1976-10-22 1979-09-20 Allied Chemical Corp. Continuous casting of metal strip
US4142571A (en) * 1976-10-22 1979-03-06 Allied Chemical Corporation Continuous casting method for metallic strips
US4124664A (en) * 1976-11-30 1978-11-07 Battelle Development Corporation Formation of filaments directly from an unconfined source of molten material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881540A (en) * 1973-10-29 1975-05-06 Allied Chem Method of forming metallic filament cast on interior surface of inclined annular quench roll

Also Published As

Publication number Publication date
WO1979001054A1 (en) 1979-12-13
JPH029900B2 (enrdf_load_stackoverflow) 1990-03-05
DE2965347D1 (en) 1983-06-16
CA1151389A (en) 1983-08-09
JPS55500295A (enrdf_load_stackoverflow) 1980-05-15
EP0016006A4 (en) 1980-09-29
EP0016006A1 (en) 1980-10-01

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