US3598732A - Coated molybdenum mesh screen for ferrous metal casting molds - Google Patents

Coated molybdenum mesh screen for ferrous metal casting molds Download PDF

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Publication number
US3598732A
US3598732A US866353A US3598732DA US3598732A US 3598732 A US3598732 A US 3598732A US 866353 A US866353 A US 866353A US 3598732D A US3598732D A US 3598732DA US 3598732 A US3598732 A US 3598732A
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US
United States
Prior art keywords
screen
cast iron
coating
molybdenum
poured
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
US866353A
Other languages
English (en)
Inventor
Daniel W Foster
William G Scholz
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.)
Cyprus Amax Minerals Co
Original Assignee
American Metal Climax Inc
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 American Metal Climax Inc filed Critical American Metal Climax Inc
Application granted granted Critical
Publication of US3598732A publication Critical patent/US3598732A/en
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
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/02—Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action including acoustic waves
    • C22B9/023—By filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/086—Filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • B22D43/004—Retaining slag during pouring molten metal by using filtering means
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D5/00—Coating with enamels or vitreous layers
    • C23D5/10—Coating with enamels or vitreous layers with refractory 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • 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
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • 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
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 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
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/266—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension of base or substrate

Definitions

  • This invention relates to an improved coated screen for use in the pouring of cast iron and to an improved method of making such a screen.
  • a screen embodying this invention is particularly adapted for removing impurities from molten cast iron as it is poured.
  • the screen comprises a molybdenum screen having a plurality of strands defining openings. These strands are readily soluble in the poured cast iron at its pouring temperatures.
  • a coating is formed on the molybdenum screen from a material having a substantially higher melting point than the temperature of the poured cast iron. The coating on the screen is sufficient to prevent direct contact between the poured cast iron and the molybdenum of the screen.
  • a method embodying this invention is particularly adapted for coating a screen as set forth in the preceding paragraph.
  • a mixture of the coating ma- 3,598,732 Patented Aug. 10, 1971 terial and a solvent that is adapted to each the molybdenum is placed upon the molybdenum screen and is dried.
  • the reference numeral 11 indicates a sand mold for use in the casting of articles formed from ferrous metals, such as any of the cast irons.
  • the mold 11 is comprised of a drag 12 formed from casting sand ram packed into a drag flash 13.
  • a cope 14 which is also formed from casting sand ram packed into a cope flask 15.
  • the cope 14 and drag 12 engage each other along a parting line indicated generally by the reference numeral 16.
  • a cavity 17 is formed in the drag 12 and cope 14 in a known manner which cavity has the shape of the article to be cast. As is well known in casting techniques, one or more cores may be inserted into the cavity 17 if openings are desired in the finished casting.
  • a runner 18 is formed in the drag 12 adjacent the parting line 16 and opening at one end into the cavity 17. The other end of the runner 18 terminates in an enlarged cavity 19 which is adjacent to the lower end of a sprue 21 formed in the cope 14 and may be considered to be an extension thereof.
  • the sprue 21 extends vertically through the cope 14 and terminates at its upper end in an enlarged pouring basin 22.
  • a riser 23 is formed which extends through a portion of the drag 12 and through the cope 14. The riser 23 terminates in the upper surface of the cope 14.
  • the molten cast iron is poured into the pouring basin 22 from a ladle or the like at a temperature that will be considerably lower than the melting point of molybdenum.
  • This molten cast iron passes down the sprue 21, across the runner 18 and into the cavity 17.
  • Sufiicient metal is poured to fill the riser 23 and insure that the complete volume of the casting 17 is filled.
  • the cast iron thus poured contains slag or other drosses which might enter the cavity 17 and form impurities within the finished cast article.
  • a coated expanded molybdenum screen indicated generally by the reference numeral 25, is positioned within the mold 11 at the parting line 16 and extending across the sprue 21.
  • the coated screen 25 is formed about a base expanded molybdenum screen.
  • the molybdenum screen is formed with a plurality of generally like size uniformly distributed polygonal openings 26 that are defined by unitary strands 27 of molybdenum.
  • the strands 27 defining adjacent openings 26 are integrally connected to each other at the apexes of the polygonal openings, as clearly shown in FIG. 3.
  • This form of screen may be made by any conventional metal expanding technique.
  • the molybdenum screen has an approximate mesh thickness of 0.020 inch and a mesh strand width of 0.010 inch.
  • the approximate size of the uncoated openings is 0.280 inch in their long direction and 0.125 inch in their short direction. There are approximately 60 openings per square inch and the open area of the mesh comprises about 85% of its total cross-sectional area.
  • the coating 28 is of a material that has a higher melting point than the melting point of the poured cast iron.
  • the coating comprises 80% alundum and 20% silica by weight.
  • the coating is applied by forming a mixture containing approximately 58% by weight of the alundum-silica mixture in the aforenoted percentages and 42% by weight of a sodium hydroxide.
  • the sodium hydroxide was in the strength of 200 grams of sodium hydroxide per liter of water.
  • the coated mesh was allowed to air dry for half an hour and then was transferred to a furnace set at 800 F. or the coated mesh may be directly placed in the 800 F. furnace. The coated mesh was left in the furnace at 800 F. for two hours.
  • Mesh coated in the aforenoted manner is effective in protecting the molybdenum from dissolving in the poured cast iron.
  • the coated mesh is eifective in removing slags and drosses from the cast iron as it is poured. If a thicker coating is desired, the aforenoted coating procedure may be repeated as many times as necessary to provide the desired coating thickness.
  • a coating that is more rigid and which will lend itself to more handling without disturbing the coating.
  • Such a coating has been formed by sintering or fusing the mesh which has been coated in the aforenoted manner.' To accomplish this, the coated mesh which was dried in the 800 F. furnace was transferred to a hydrogen furnace while still warm so that the sodium hydroxide did not pick up any moisture from the air and was heated for one minute in the hydrogen furnace at 2900 F. This temperature was sufficient to cause sintering or fusion of the coating. The silica which was added to the alundum reduced the fusion temperature of the mixture so that fusion would occur at 2900 F. temperature.
  • the coated mesh is cooled still in the presence of the hydrogen atmosphere until suificiently cool to bring into the presence of the atmosphere.
  • the resulting mesh was completely covered and the coating was very hard and adherent.
  • a thicker coating can be applied by repeating the aforenoted procedure any number of times.
  • the coating thickness on the single coating procedure is about 0.002 inch and a coating thickness of about 0.006 inch results if the procedure is repeated twice.
  • a screen for removing impurities from molten cast iron as it is poured comprising a molybdenum screen having a plurality of strands defining openings, said strands being readily soluble in the poured cast iron at its pouring temperature, and a coating upon the molybdenum screen, said coating being formed from a material having a substantially higher melting point than the temperature of the poured cast iron and coating said screen sufliciently to prevent direct contact between the poured cast iron and the molybdenum screen.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Manufacturing & Machinery (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Chemically Coating (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
US866353A 1969-10-14 1969-10-14 Coated molybdenum mesh screen for ferrous metal casting molds Expired - Lifetime US3598732A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86635369A 1969-10-14 1969-10-14

Publications (1)

Publication Number Publication Date
US3598732A true US3598732A (en) 1971-08-10

Family

ID=25347425

Family Applications (1)

Application Number Title Priority Date Filing Date
US866353A Expired - Lifetime US3598732A (en) 1969-10-14 1969-10-14 Coated molybdenum mesh screen for ferrous metal casting molds

Country Status (10)

Country Link
US (1) US3598732A (de)
JP (1) JPS508017B1 (de)
AT (2) AT324069B (de)
CA (1) CA955807A (de)
CH (1) CH518139A (de)
DE (1) DE2048640A1 (de)
FR (2) FR2100586B1 (de)
GB (2) GB1311000A (de)
NL (1) NL144178B (de)
SE (1) SE359041B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938802A (en) * 1989-01-19 1990-07-03 Corning Incorporated Reusable ceramic mold
EP0378150A2 (de) * 1989-01-09 1990-07-18 Albrecht Gräfer Reduzierplatte
US20040194905A1 (en) * 2003-04-02 2004-10-07 Ulerick Christopher E. Apparatus and method for inserting parts into a mold
US20110048663A1 (en) * 2009-04-01 2011-03-03 Foseco International Limited Mould for metal casting and method using same
CN103157766A (zh) * 2011-12-08 2013-06-19 洛阳奇润电力科技有限公司 耐高温纤维过滤网的应用方法
WO2017008092A1 (de) * 2015-07-10 2017-01-19 Plansee Se Metallfilter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2539061A1 (fr) * 1983-01-11 1984-07-13 Fonderie Mecanique Ste Bretonn Dispositif de filtration pour la coulee de metaux ferreux
GB8600734D0 (en) * 1986-01-14 1986-02-19 Hallam Ind Supplies Ltd Casting of metals

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0378150A2 (de) * 1989-01-09 1990-07-18 Albrecht Gräfer Reduzierplatte
EP0378150A3 (de) * 1989-01-09 1991-01-09 Albrecht Gräfer Reduzierplatte
US4938802A (en) * 1989-01-19 1990-07-03 Corning Incorporated Reusable ceramic mold
US20040194905A1 (en) * 2003-04-02 2004-10-07 Ulerick Christopher E. Apparatus and method for inserting parts into a mold
US6913063B2 (en) 2003-04-02 2005-07-05 Toyota Motor Manufacturing North America, Inc. Apparatus and method for inserting parts into a mold
US7156145B1 (en) 2003-04-02 2007-01-02 Toyota Motor Engineering & Manufacturing North America Apparatus and method for inserting parts into a mold
US20110048663A1 (en) * 2009-04-01 2011-03-03 Foseco International Limited Mould for metal casting and method using same
US8186420B2 (en) * 2009-04-01 2012-05-29 Foseco International Limited Mould for metal casting and method using same
US20120227922A1 (en) * 2009-04-01 2012-09-13 Foseco International Limited Mould for metal casting and method using same
AU2009332927B2 (en) * 2009-04-01 2014-01-09 Foseco International Limited Mould for metal casting and method using same
US8627874B2 (en) * 2009-04-01 2014-01-14 Foseco International Limited Mould for metal casting and method using same
CN103157766A (zh) * 2011-12-08 2013-06-19 洛阳奇润电力科技有限公司 耐高温纤维过滤网的应用方法
WO2017008092A1 (de) * 2015-07-10 2017-01-19 Plansee Se Metallfilter

Also Published As

Publication number Publication date
CH518139A (de) 1972-01-31
FR2100586B1 (de) 1976-07-09
AT314104B (de) 1974-03-25
GB1310999A (en) 1973-03-21
AT324069B (de) 1975-08-11
NL144178B (nl) 1974-12-16
CA955807A (en) 1974-10-08
FR2109722A5 (de) 1972-05-26
DE2048640A1 (de) 1972-03-16
FR2100586A1 (de) 1972-03-24
JPS508017B1 (de) 1975-04-01
NL7014933A (de) 1971-04-16
GB1311000A (en) 1973-03-21
SE359041B (de) 1973-08-20

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