EP0000926A1 - Verfahren und Vorrichtung zur Herstellung von flockenförmigen Teilchen aus einer Schmelze - Google Patents

Verfahren und Vorrichtung zur Herstellung von flockenförmigen Teilchen aus einer Schmelze Download PDF

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Publication number
EP0000926A1
EP0000926A1 EP78100688A EP78100688A EP0000926A1 EP 0000926 A1 EP0000926 A1 EP 0000926A1 EP 78100688 A EP78100688 A EP 78100688A EP 78100688 A EP78100688 A EP 78100688A EP 0000926 A1 EP0000926 A1 EP 0000926A1
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EP
European Patent Office
Prior art keywords
molten material
molten
serrations
disk
degrees
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.)
Granted
Application number
EP78100688A
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English (en)
French (fr)
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EP0000926B1 (de
Inventor
Robert E. Maringer
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.)
Battelle Development Corp
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Battelle Development Corp
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Publication date
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Publication of EP0000926A1 publication Critical patent/EP0000926A1/de
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Publication of EP0000926B1 publication Critical patent/EP0000926B1/de
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/002—Making metallic powder or suspensions thereof amorphous or microcrystalline
    • B22F9/008—Rapid solidification processing
    • 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
    • B22D11/0611—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a single casting wheel, e.g. for casting amorphous metal strips or wires
    • B22D11/0614—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a single casting wheel, e.g. for casting amorphous metal strips or wires the casting wheel being immersed in a molten metal bath, and drawing out upwardly the casting strip
    • 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
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0651—Casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/10—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying using centrifugal force
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/005—Manufacture of flakes

Definitions

  • This invention relates to a method capable of producing flake particles directly from a supply of molten material by the use of a rotating member having discrete serrations in the peripheral edge thereof in which the leading surfaces of the serrations contact the molten material and have formed thereon flake particles.
  • flake particles As used herein the terms flake particles, flakes and flake refer to particles of relatively small size, in the hundredths of an inch range, and the terms include particles frequently referred to as powders because of their small size.
  • the surface areas of the flakes and powders are important also. While these fine powders are attractive, the huge surface areas created are readily contaminated, and handling becomes difficult. On the otherhand, larger particles with a very fine grain size are less easily contaminated, and retain many of the desirable characteristics of the very fine powders. It is desirable to produce a product which has a very fine grain size that is not so small as to have a large total surface area in a substantial quantity of individual product members. A discussion of this will be found in a paper published in Solidification Technology, pp. 317-336, NCIC in 1974.
  • Rapid quenching is probably the simplest method for producing small grain sizes. In general, higher quenching rates produce smaller grain sizes, with quench rates of the order of i06 C. degrees change per second of time producing grain sizes (or dendrite arm spacing) of the order of one micron. For the most part, the standard gas or water atomization processes for powder manufacture are limited to quench rates below about 10 4 C. per second, and therefore to dendrite arm spacing of 10 microns.
  • Splat quenching in which molten metal contacts a cool metallic surface provides quench rates that are very high.
  • Splat quenching has been practiced in the past by atomizing droplets against a rotating smooth cooling disc to produce powders of relatively uncontrolled configurations and irregular shapes, with a random distribution of variation in these parameters.
  • an orifice usually requires additional heating to insure that metal does not solidify in the orifice and thereby changes the shape of the product formed.
  • the use of small orifices requires extremely clean melts to prevent intermittent plugging or restriction of the orifices.
  • the present invention forms the desired product directly from the molten state and without the need for controlling the size of the orifice or flow rate.
  • the formation of the materials into final flake particles form is carried out while the material is formed directly from the molten state, and therefore inorganic compounds having properties in the molten state similar to that of molten metals and metal alloys may be formed in substantially the same manner.
  • the properties that must be similar to those of molten metal are the viscosity and surface tension in the molten state, as well as the compound having a substantially discrete melting point, rather than the broad continuous range of viscosities characteristic of molten glasses.
  • Materials conforming to the class for this invention and having such properties will have a viscosity in the molten state when at a temperature of within 25% of their equilibrium melting point in degrees Kelvin in the range of 10 -3 to 1 poise as well as having surface tension values in that same temperature range in the order of from 10 to 2500 dynes per centimeter.
  • the prior art discloses atomization of molten stream materials sprayed from an orifice upon the surface of a rotating copper roll. When the atomized stream strikes and splotches against the cool surface of the roll, rapid quenching takes place and a multitude series of random-shaped flakes are formed.
  • the present invention controls the shape and size of the final flake product. Controlling the size and shape, including thickness, are very important in determining the physical properties of the product when the size of the product is very small.
  • the invention as herein disclosed is a method and apparatus for producing flake particles directly from material having characteristics similar to molten metals, from pools of molten metals or from unconfined pendant drops of molten material by contacting the molten material to the serrated edge of a rotating disk-like member on which a flake particle is formed on the leading edge of each serration of the disk-like member.
  • Each of the serrations on the periphery of the wheel has a single small particle formed on the leading edge.
  • the product sizes are in the range of 0.038 x 0.025 x 0.005 centimeters. They have a range of width measurements of less than 10 times the thickness measurements and a range of length measurements of less than 3 times the width measurements.
  • the leading edges of the serration on the periphery of the cooling disk are caused to impact against the molten surface of the material, primarily by the rotation of the disk which advances the leading edge against the surface of the material.
  • the disk In order for the contact of the leading edge to be made with the surface of the molten material, the disk must be brought to a position on or near the equilibrium surface level of the molten material the product is produced from.
  • This surface may be a molten pool-like surface or the edge of a molten pendant drop formed by the surface tension of the drop. The axis of disk rotation is moved toward or away from the surface to adjust the position.
  • a rotatable heat-extracting disk-like member 20 is rotated above a pool of molten material 21.
  • Disk 20 is rotated on a shaft 22 that is connected through a conventional type of transmission device, such as an electric motor, gear box or other well known apparatus, not shown.
  • the supply of molten material referred to as the melt 21 is heated and contained by a vessel 23 having elements 24 to heat the material contained to a temperature above its melting point.
  • the outer "peripheral" edge of disk 20 is provided with sloping serrations or teeth 28 (synonymously referred to herein). Each serration has a sloping leading edge 25 and a radial face 26.
  • the disk 20 and the shaft 22 are arranged to be raised and lowered relative to the surface 27 of the molten material 21. When in operation under proper conditions, the distance between the shaft 22 and surface 27 is reduced and the periphery of disk 20 is lowered into surface 27 causing the leading edges 25 of serrations 28 to strike and impact upon the surface 27 in a rapid stroking action.
  • leading edge 25 impacts on the surface 27 forming a rapidly cooling wave at the front of the serration. Quenching begins immediately. As leading edge 25 leaves the wave front of surface 27, further quenching of the molten material takes place and flakes 30 are formed on the surface of the leading edge 25. Temporarily adhering to the surface, the flakes are lifted clear and raised to the point where centrifugal force and the resistance of the surrounding atmospheric air or other gas causes them to break clear and eject to a container 31. There they fall into a storage compartment portion 32. The release is not completely understood and it is thought that complex thermal stresses may have an effect in the release.
  • the supply of molten material referred to as a melt 21 may be composed of an elemental metal, metal alloy, or an inorganic compound. While the amount of superheat (number of degrees in excess of the material equilibrium point) will affect the size and thickness of flakes 30, it has been found that substantially uniformly shaped flakes can be produced with a melt at a temperature of within 25% of the equilibrium melting point (in degrees K) of the material used with no need for the precise control of the melt temperature during operations. While this quantitative definition of the preferred temperature will normally encompass the desired melt temperature, it should be understood that the process does not require unusual melt temperatures. Therefore, the process is known to be operable with metals and metal alloys at conventional casting temperatures that represent a compromise between the cost of heating versus fluidity of the molten material.
  • the melt 21 may have a thin protective flux coating to prevent excessive reaction with the surrounding atmosphere without substantially disturbing the formation of the flake particle 30.
  • the flake particle is initially formed on the leading surface 25 of serration 28 beneath such flux and will pass through the surface flux upon exit without any adverse effects.
  • the simplicity of the apparatus lends itself to the use of a simple container (not shown) where an inert atmosphere is provided surrounding the melt and the flakes.
  • Disk 20 is tapered near the outer edge, as shown in Figure 2. By this means sufficient heat-extracting structural mass is provided near the edge, but only a small surface is presented to the surface of the molten material.
  • the angle of taper a in the cross section of the disk 20 may apparently be any value which, taking into account the other dimensions of the serrations, will produce relatively short and wide flake particles. Taper angles a of 60 degrees and 90 degrees have been demonstrated to provide suitable flakes.
  • the slope of the serrations is established by the height H, from the tip to the base of the trailing edge 26, the circumferential distance p, (i.e., the pitch), and the angle 0 between a line tangent to the peripheral projection at the base of the serration 28 and the surface of the leading edge 25.
  • FIG. 4 Another embodiment of the present invention is shown in Figures 4 and 5 where a rotating heat-extracting disk-like member 20' having a V shaped tapered edge with an angle a' is rotated on a shaft 22' generally in the manner described for the embodiment of Figure 1.
  • flake particles 30' are formed at the top of the disk 20' by contact with a molten pendant drop 35 at the-end of a rod 36 of material for the production of flakes.
  • Material 36 is heated locally at or near the end to form the molten pendant drop, by means not shown and not critical to the invention.
  • an oxygen- acetylene torch may be used with many materials and if an acetylene rich mixture is used it will have the advantage of providing a shielding atmosphere for the drop to reduce oxidation of the molten material.
  • Various heating means may be used including resistance heating, induction heating, electron beam heating, etc.
  • the means used for local heating of the solid source will be determined by considering the melting point of the material to be melted, the mass of the material to be molten at a given time and the rate at which the source material is to be heated to its melting point. If the heat supplied to the material is excessive, then the pendant drop may become too large to remain stable. If the heat is insufficient, the rotating disk-like member will not have sufficient molten material to produce flake particles of controlled dimension.
  • leading surfaces 25' contact the molten pendant drop by impacting against the surface of the drop 35.
  • Very rapid cooling (quenching) takes place as flake particle 30' is formed on the surface 25' as also shown in Figures 7 and 8.
  • Flake particles 30, 30' have a thickness T, a length L, and a width W.
  • the length L and the width W are a function of the shape of the underlying leading edge surface 25, 25'.
  • Leading edge surfaces 25, 25' have a surface area, configuration, and dimensions that are determined by the edge taper angles a, a', the contact angle 0, the pitch P, and the height H.
  • flake particles 30' are extracted from the molten pendant drop 35, solidified by the cooling effect of the surface 25', and ejected into a container 37 where they are collected in a storage portion 38.
  • the flake particles 30' are removed from the surface 25' by resistance to the atmosphere and centrifugal force.
  • the stability of the molten pendant drop as utilized in the present invention is maintained when operating parameters disclosed herein as used.
  • the area of the contact surface 25, 25' is small and tapers to a point at the moment contact is ended with the drop surface. This minimizes the disturbance of the drop surface which through surface tension is responsible for the stability of the drop form.
  • the materials which may be processed thru the embodiment of Figure 4 have been found to be the same as those that may be processed thru the embodiment of Figure 1.
  • the present invention is operable with metal alloys even though such alloys display a wide temperature range between the first solidification of any component within the alloy (the liquidus temperature) and the temperature at which the lowest melting point compositions solidify (the solidus temperature) yielding a completely solid material.
  • the liquidus temperature the first solidification of any component within the alloy
  • the solidus temperature the temperature at which the lowest melting point compositions solidify
  • a disk-like member 40 is supported for rotation on shaft 41.
  • Member 40 has multiple outer "peripheral" edges which are provided with sloping serrations 42.
  • the serration 42 have the same configuration and structure as that shown and previously described above for single edge disk-like members.
  • the length of the flake particles will be some fraction of the serration spacing (P), being longer for greater spacings.
  • the length L will decrease as the contact angle 0 increases.
  • Particle width (W) will depend on width of the "land", or the leading edge surface area. This is controlled with the taper angle a as well as the length L and the contact angle e.
  • the thickness (T) of the particle will depend to some extent on the disk rotational speed, with higher speeds producing thinner particles. As a result, considerable control can be exerted on the shape and dimensions of individual flake particles.
  • leading edge surface passing through the molten material, induces a component of motion in the liquid away from such surface. This component assists the liquid in making a clean break before it contacts the following serration leading edge surface. This is probably the reason why such tiny serrations (as small as P equals 0.05 centimeter) are successful in producing separate flake particles.
  • the fluid motion induced by the contact angle 0 is a very important aspect in the use of serrated-edge disks. As angle e increases, the turbulence induced in the melt increases, and it becomes necessary to use lowered disk speeds in compensation. Therefore, serrations with contact angles over about 20 degrees, while workable, are not preferred. Contact angles e from 3 to 12 degrees are much more preferable. It is to be noted that, as the contact angle e and the circumferential distance P, are decreased, the height H is also decreased. When the height H is below about 0.0025 centimeter, separation of the molten metal into individual particles becomes significantly less efficient. With height H at 0.0076 centimeter, separation is not a problem. Thus, the minimum pitch P for an angle 9 of 3 degrees is probably about 0.025 to 0.051 centimeter. For a contact angle 0 of 6 degrees, the minimum pitch P should be about half as much, or 3 degrees.
  • Flakes were produced using molten pendant drop apparatus, in an air atmosphere, using an oxyacetylene torch as the heat source for the material, and one-quarter-inch diameter 304 stainless steel as the material.
  • the gas mixture was kept slightly acetylene rich, to limit oxidation of the molten droplet.
  • a 20.3 cm. diameter single-edge heat-extracting water-cooled disk of brass was rotated at a speed of 100 rpm (61 meters per minute). The stainless steel rod was fed to the disk at the rate of 0.38 centimeter per minute.
  • Example I The method and apparatus of Example I was operated at 500 rpm to produce good product at a rate of about 712 grams per hour.
  • Flakes were produced using molten pool apparatus, in an air atmosphere, with molten zinc.
  • a 20.3 cm. diameter single-edge heat-extracting disk of brass was rotated at a speed of 100 rpm (61 meters per minute) and lowered into the surface of pool of the melt.
  • Example III The method and apparatus of Example III was operated at 500 rpm to produce good product at a rate of about 318 grams per hour.
  • Flakes were produced using molten pendant drop apparatus, in an air atmosphere, using an oxyacetylene torch as the heat source for the material, and one-quarter-inch diameter 304 stainless steel rod as the material.
  • the gas mixture was kept slightly acetylene rich, to limit oxidation of the molten droplet.
  • An 18.4 cm. diameter multiple edge heat-extracting water-cooled disk of brass was rotated at a speed of 1100 rpm (658 meters per minute). The stainless steel rod was fed to the disk at a rate of 1.04 centimeters per minute.
  • Flakes were produced using molten pendant drop apparatus in vacuum, using an electron beam as the heat source for the material and a 0.48 cm. diameter T i-6Al-4V alloy as the material.
  • the same heat-extracting water cooled disk as used in Example V was rotated at 350 rpm (202 meters per minute).
  • the titanium alloy rod was fed to the disk at a rate of 1.27 centimeters per minute.
  • a flake particle product by this disk weighed about 4.54 x 10- 5 gram.
  • Flakes were produced using molten pendant drop apparatus, in an air atmosphere, using an oxyacetylene torch as the heat source for the material, and a 0.635 cm. diameter 304 stainless steel rod as the material.
  • the gas mixture was kept slightly acetylene rich to limit oxidation of the molten droplet.
  • a 20.32 cm. diameter heat-extracting water-cooled disk of brass was rotated at a speed of 2000 rpm (1277 meters per minute) the stainless steel rod was fed to the disk at a rate of 0.69 centimeter per minute.
EP78100688A 1977-08-22 1978-08-17 Verfahren und Vorrichtung zur Herstellung von flockenförmigen Teilchen aus einer Schmelze Expired EP0000926B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US826798 1977-08-22
US05/826,798 US4154284A (en) 1977-08-22 1977-08-22 Method for producing flake

Publications (2)

Publication Number Publication Date
EP0000926A1 true EP0000926A1 (de) 1979-03-07
EP0000926B1 EP0000926B1 (de) 1981-09-30

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EP78100688A Expired EP0000926B1 (de) 1977-08-22 1978-08-17 Verfahren und Vorrichtung zur Herstellung von flockenförmigen Teilchen aus einer Schmelze

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US (1) US4154284A (de)
EP (1) EP0000926B1 (de)
JP (1) JPS6016481B2 (de)
CA (1) CA1133670A (de)
DE (1) DE2861232D1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017723A1 (de) * 1979-03-23 1980-10-29 Allied Corporation Verfahren und Vorrichtung zum Herstellen metallischen Glaspulvers
FR2524834A1 (fr) * 1982-04-08 1983-10-14 Nippon Yakin Kogyo Co Ltd Dispositif pour produire des paillettes a partir d'un courant continu de materiau fondu projete, notamment metallique
EP0293502A1 (de) * 1986-02-07 1988-12-07 Aluminum Company Of America Verfahren zur Analyse von flüssigem Metall
WO1998017425A1 (fr) * 1996-10-22 1998-04-30 Boris Sergeevich Mitin Dispositif permettant de disperser un materiau par extraction dans un bain en fusion

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US4276924A (en) * 1978-06-02 1981-07-07 The Singer Company Method and apparatus for casting a splat-cooled flexure member
US4290993A (en) * 1980-01-10 1981-09-22 Battelle Development Corp. Method and apparatus for making nodule filament fibers
US4385013A (en) * 1981-06-08 1983-05-24 Battelle Development Corporation Method and apparatus for producing particles from a molten material using a rotating disk having a serrated periphery and dam means
JPS58500844A (ja) * 1981-06-08 1983-05-26 バツテル・デイベロプメント・コ−ポレ−シヨン 粒状物製造方法及び装置
JPS60170565A (ja) * 1984-02-10 1985-09-04 Nippon Yakin Kogyo Co Ltd 球状金属粒子の製造方法
US4647511A (en) * 1984-03-28 1987-03-03 Nippon Yakin Kogyo Co., Ltd. Flake like metal chips, a method of and an apparatus for making the same
JPS60204647A (ja) * 1984-03-28 1985-10-16 日本冶金工業株式会社 片状金属チップ及びその製造装置
US4783417A (en) * 1986-02-07 1988-11-08 Aluminum Company Of America System for on-line molten metal analysis
US4936371A (en) * 1988-12-23 1990-06-26 Aluminum Company Of America Molten metal sampling, wave damping, flake removal and means for collecting and forwarding flakes for composition analysis
US5049335A (en) * 1989-01-25 1991-09-17 Massachusetts Institute Of Technology Method for making polycrystalline flakes of magnetic materials having strong grain orientation
AU4822499A (en) * 1998-06-15 2000-01-05 Boeing Company, The Making particulates of controlled dimensions
US7291186B2 (en) * 2004-11-01 2007-11-06 Teck Cominco Metals Ltd. Solid porous zinc electrodes and methods of making same
GB0502166D0 (en) * 2005-02-02 2005-03-09 Effectology Ltd Ink-jet printing process
JP2009504909A (ja) * 2005-08-12 2009-02-05 ダンウィルコ（１１９８）リミテッド 金属フレーク製造方法
CN112088845B (zh) * 2020-09-03 2022-08-19 张万容 一种自动下料式铅皮制作设备

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DE1018199B (de) * 1955-12-30 1957-10-24 August Messler Verfahren und Vorrichtung zum Erzeugen von Fasern aus in der Hitze plastischen Stoffen mineralischer Herkunft
GB1143518A (en) * 1966-09-23 1969-02-26 Emile Constantin Savini Dentifrice compositions containing derivatives of hydantoin
US3577520A (en) * 1969-12-19 1971-05-04 Emile Constantin Savini Dentifrice compositions containing 5,5-diaryl - 2,4 -imidazolidinediones and process of treating pyorrhea
US3838185A (en) * 1971-05-27 1974-09-24 Battelle Development Corp Formation of filaments directly from molten material
US3896203A (en) * 1973-04-23 1975-07-22 Battelle Development Corp Centrifugal method of forming filaments from an unconfined source of molten material
US3904344A (en) * 1972-05-10 1975-09-09 Battelle Development Corp Apparatus for the formation of discontinuous filaments directly from molten material
GB1462695A (en) * 1973-05-07 1977-01-26 Ciba Geigy Ag Hydroxy-phenylated hydantoins and their use as stabilisers for organic materials

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GB191007315A (en) * 1908-04-18 1910-08-23 William George Wagner Improvements in and relating to the Granulation of Metals or other Substances.
GB451268A (en) * 1934-10-30 1935-05-02 Chem Ind Basel Manufacture of hydantoins
GB644800A (en) * 1940-09-09 1950-10-18 Parke Davis & Co Method for obtaining hydantoins
US2366221A (en) * 1942-03-13 1945-01-02 James J Spurlock 5-substituted-5-(2-thienyl) hydantoins
DE1018199B (de) * 1955-12-30 1957-10-24 August Messler Verfahren und Vorrichtung zum Erzeugen von Fasern aus in der Hitze plastischen Stoffen mineralischer Herkunft
DE1017172B (de) * 1956-05-19 1957-10-10 Heyden Chem Fab Verfahren zur Herstellung von 5-(p-Bromphenyl)-5-aethylhydantoin bzw. dessen 3-methyl- und 3-oxymethylsubstituierten Derivaten
GB1143518A (en) * 1966-09-23 1969-02-26 Emile Constantin Savini Dentifrice compositions containing derivatives of hydantoin
US3577520A (en) * 1969-12-19 1971-05-04 Emile Constantin Savini Dentifrice compositions containing 5,5-diaryl - 2,4 -imidazolidinediones and process of treating pyorrhea
US3838185A (en) * 1971-05-27 1974-09-24 Battelle Development Corp Formation of filaments directly from molten material
US3904344A (en) * 1972-05-10 1975-09-09 Battelle Development Corp Apparatus for the formation of discontinuous filaments directly from molten material
US3896203A (en) * 1973-04-23 1975-07-22 Battelle Development Corp Centrifugal method of forming filaments from an unconfined source of molten material
GB1462695A (en) * 1973-05-07 1977-01-26 Ciba Geigy Ag Hydroxy-phenylated hydantoins and their use as stabilisers for organic materials

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017723A1 (de) * 1979-03-23 1980-10-29 Allied Corporation Verfahren und Vorrichtung zum Herstellen metallischen Glaspulvers
FR2524834A1 (fr) * 1982-04-08 1983-10-14 Nippon Yakin Kogyo Co Ltd Dispositif pour produire des paillettes a partir d'un courant continu de materiau fondu projete, notamment metallique
EP0293502A1 (de) * 1986-02-07 1988-12-07 Aluminum Company Of America Verfahren zur Analyse von flüssigem Metall
WO1998017425A1 (fr) * 1996-10-22 1998-04-30 Boris Sergeevich Mitin Dispositif permettant de disperser un materiau par extraction dans un bain en fusion

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JPS6016481B2 (ja) 1985-04-25
CA1133670A (en) 1982-10-19
EP0000926B1 (de) 1981-09-30
DE2861232D1 (en) 1981-12-10
US4154284A (en) 1979-05-15
JPS5460262A (en) 1979-05-15

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