GB1352567A - Method of checking adjusting the content of crystallization nuclei in a melt - Google Patents

Method of checking adjusting the content of crystallization nuclei in a melt

Info

Publication number
GB1352567A
GB1352567A GB1194171*[A GB1352567DA GB1352567A GB 1352567 A GB1352567 A GB 1352567A GB 1352567D A GB1352567D A GB 1352567DA GB 1352567 A GB1352567 A GB 1352567A
Authority
GB
United Kingdom
Prior art keywords
melt
sample
curve
solidification
test vessel
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
Application number
GB1194171*[A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1352567A publication Critical patent/GB1352567A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
    • G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/20—Metals
    • G01N33/205—Metals in liquid state, e.g. molten metals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Silicon Compounds (AREA)

Abstract

1352567 Sampling molten metal S L BACKERUD 28 April 1971 11941/71 Heading B3F [Also in Division C7] In order to determine whether a first metal melt has the desired amount of crystallizing nucleants, a sample is taken from the melt by immersing a test vessel, at a temperature higher than the nucleating temperature of the melt, in the melt. The test vessel is withdrawn from the melt and the sample is allowed to solidify under controlled conditions, a record of the sample's temperature being made at various times during its solidification. A cooling curve of temperature against time is plotted. This curve is then compared with a second curve obtained for a second standard melt of the same composition as the sample but having the desired amount of nucleant and solidified under the same controlled conditions as the sample. If the solidification curve of the sample differs from that of the standard, nucleants can be added to the first melt or can be removed therefrom by filtration or decanting. The controlled conditions under which the sample is solidified are:-(i) the convection of the melt is reduced to minimum, e.g. by application of a magnetic field, (ii) heat dissipation from the sample takes place in all directions, (iii) the thermocouple used is placed centrally of the sample, and (iv) the materials of the test vessel, thermocouple &c. do not act as nucleants for the melt. It is also preferable that the sample has a volume of 5- 50 cc. and that the thermocouple is placed not less than 1 cm. from the test vessel wall. Tests on aluminium, aluminium-silicon alloy (both using graphite crucibles as test-vessels) and cast iron (using a ceramic crucible) are exemplified. The effectiveness of primary nucleation in melts can be compared by observing the supercooling necessary before onset of nucleation and the slope of the curve in the "plateau" region where the latent heat of solidification slows down cooling of the melt. For judging the effectiveness of secondary nucleation, e.g. the solidification of Al-Si eutectic in Al-Si alloys, or of nodular graphite in cast iron, the area under positive values of the derivative during recalation of the sample may be measured.
GB1194171*[A 1971-04-28 1971-04-28 Method of checking adjusting the content of crystallization nuclei in a melt Expired GB1352567A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1194171 1971-04-28

Publications (1)

Publication Number Publication Date
GB1352567A true GB1352567A (en) 1974-05-08

Family

ID=9995461

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1194171*[A Expired GB1352567A (en) 1971-04-28 1971-04-28 Method of checking adjusting the content of crystallization nuclei in a melt

Country Status (1)

Country Link
GB (1) GB1352567A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4134785A (en) * 1977-04-13 1979-01-16 Western Electric Company, Inc. Real-time analysis and control of melt-chemistry in crystal growing operations
EP0107237A1 (en) * 1982-10-11 1984-05-02 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method for the automatic control of the structure of rolled steel products
EP0157308A2 (en) * 1984-03-31 1985-10-09 Fritz Winter, Eisengiesserei O.H.G. Method and apparatus for the thermal analysis of cast iron
EP1245951A1 (en) * 2001-03-30 2002-10-02 Korporam B.V. Method and measuring system for determining the crystal fraction in a crystal suspension mixture
NL1019105C2 (en) * 2001-10-03 2003-04-04 Corus Technology B V Method and device for controlling the proportion of crystals in a liquid-crystal mixture.
US7419530B2 (en) 2002-07-05 2008-09-02 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method for fractional crystallisation of a molten metal
US7531023B2 (en) 2004-03-19 2009-05-12 Aleris Switzerland Gmbh Method for the purification of a molten metal
US7537639B2 (en) 2003-11-19 2009-05-26 Aleris Switzerland Gmbh Method of cooling molten metal during fractional crystallisation
US7648559B2 (en) 2002-07-05 2010-01-19 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method for fractional crystallisation of a metal
US7892318B2 (en) 2006-06-28 2011-02-22 Aleris Switzerland Gmbh C/O K+P Treuhandgesellschaft Crystallisation method for the purification of a molten metal, in particular recycled aluminium
US7955414B2 (en) 2006-07-07 2011-06-07 Aleris Switzerland Gmbh Method and device for metal purification and separation of purified metal from metal mother liquid such as aluminium
US8313554B2 (en) 2006-06-22 2012-11-20 Aleris Switzerland Gmbh Method for the separation of molten aluminium and solid inclusions
CN111398333A (en) * 2020-04-13 2020-07-10 中国科学院金属研究所 Differential thermal analysis method for measuring primary melting temperature of single crystal superalloy

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4134785A (en) * 1977-04-13 1979-01-16 Western Electric Company, Inc. Real-time analysis and control of melt-chemistry in crystal growing operations
EP0107237A1 (en) * 1982-10-11 1984-05-02 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method for the automatic control of the structure of rolled steel products
EP0157308A2 (en) * 1984-03-31 1985-10-09 Fritz Winter, Eisengiesserei O.H.G. Method and apparatus for the thermal analysis of cast iron
EP0157308A3 (en) * 1984-03-31 1987-05-20 Fritz Winter, Eisengiesserei O.H.G. Method and apparatus for the thermal analysis of cast iron
EP1245951A1 (en) * 2001-03-30 2002-10-02 Korporam B.V. Method and measuring system for determining the crystal fraction in a crystal suspension mixture
NL1017751C2 (en) * 2001-03-30 2002-10-22 Korporam B V Method and measuring system for determining the crystal content of a crystal suspension mixture.
US7442228B2 (en) 2001-10-03 2008-10-28 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method and device for controlling the proportion of crystals in a liquid-crystal mixture
NL1019105C2 (en) * 2001-10-03 2003-04-04 Corus Technology B V Method and device for controlling the proportion of crystals in a liquid-crystal mixture.
WO2003031663A1 (en) * 2001-10-03 2003-04-17 Corus Technology Bv Method and device fro controlling the proportion of crystals in a liquid-crystal mixture
US7419530B2 (en) 2002-07-05 2008-09-02 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method for fractional crystallisation of a molten metal
US7648559B2 (en) 2002-07-05 2010-01-19 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method for fractional crystallisation of a metal
US7537639B2 (en) 2003-11-19 2009-05-26 Aleris Switzerland Gmbh Method of cooling molten metal during fractional crystallisation
US7531023B2 (en) 2004-03-19 2009-05-12 Aleris Switzerland Gmbh Method for the purification of a molten metal
US8313554B2 (en) 2006-06-22 2012-11-20 Aleris Switzerland Gmbh Method for the separation of molten aluminium and solid inclusions
US7892318B2 (en) 2006-06-28 2011-02-22 Aleris Switzerland Gmbh C/O K+P Treuhandgesellschaft Crystallisation method for the purification of a molten metal, in particular recycled aluminium
US7955414B2 (en) 2006-07-07 2011-06-07 Aleris Switzerland Gmbh Method and device for metal purification and separation of purified metal from metal mother liquid such as aluminium
CN111398333A (en) * 2020-04-13 2020-07-10 中国科学院金属研究所 Differential thermal analysis method for measuring primary melting temperature of single crystal superalloy
CN111398333B (en) * 2020-04-13 2021-10-29 中国科学院金属研究所 Differential thermal analysis method for measuring primary melting temperature of single crystal superalloy

Similar Documents

Publication Publication Date Title
Hanna et al. Modification in the aluminum silicon system
US4667725A (en) Method for producing cast-iron, and in particular cast-iron which contains vermicular graphite
Horwath et al. Dendritic growth
GB1352567A (en) Method of checking adjusting the content of crystallization nuclei in a melt
JP2510947B2 (en) Method for discriminating presence / absence of spheroidizing agent or CV agent in molten cast iron and chilling tendency of flake graphite cast iron, and sampling container used therefor
US4046509A (en) Method for checking and regulating the conditions of crystallization in the solidification of melts
US5337799A (en) Method for the production of compacted graphite cast iron
US4166738A (en) Method for the treatment of nodular or vermicular cast iron samples
DK143916B (en) PROCEDURE FOR THERMAL DETERMINATION OF THE CARBON EQUIVALENT OF OVERUTECTIC CASTLE
Doherty et al. On the columnar to equiaxed transition in small ingots
Biloni et al. Origin of the equiaxed zone in small ingots
RU2096485C1 (en) Method of monitoring and control of crystallizability of liquid iron
Ichikawa et al. Effects of cooling rate and supercooling degree on solidified structures of Al–Mn, Al–Cr and Al–Zr alloys in rapid solidification
JP2584590B2 (en) Determination of carbon equivalent in microstructure-improved cast iron
Leone et al. The mechanism of grain refinement during solidification of Zn-Ti base alloys
Chakravorty et al. Grain refining of aluminium-lithium alloy with Al-Ti-B
Cisse et al. Freezing Front Asymmetry During Ingot Solidification of Al and Its Alloys
Dahle et al. The effect of grain refinement on the fluidity of aluminium alloys
Kaneko Dendrite coarsening during solidification of hypo-and hyper-eutectic Al-Cu alloys
US3308515A (en) Method for cast grain refinement of steel
OHNO Formation mechanism of the equiaxed chill zone in ingots
Campbell et al. The Alloys of Aluminium and Lead
JP3318746B2 (en) Method for estimating grain size of aluminum alloy
SU1545949A3 (en) Method of thermal analysis of production and modification of aluminium-silicon alloys
Schurmann et al. Quantitative Thermal Analysis of Aluminum and Aluminum--Silicon Melts During Cooling in Sand Crucibles

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee