EP0774521A1 - Aluminium master alloy - Google Patents
Aluminium master alloy Download PDFInfo
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- EP0774521A1 EP0774521A1 EP96450021A EP96450021A EP0774521A1 EP 0774521 A1 EP0774521 A1 EP 0774521A1 EP 96450021 A EP96450021 A EP 96450021A EP 96450021 A EP96450021 A EP 96450021A EP 0774521 A1 EP0774521 A1 EP 0774521A1
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- EP
- European Patent Office
- Prior art keywords
- alloy
- aluminum
- strontium
- master alloy
- weight
- Prior art date
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 34
- 239000000956 alloy Substances 0.000 title claims abstract description 34
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 18
- 239000004411 aluminium Substances 0.000 title abstract 2
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 22
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 16
- 239000011575 calcium Substances 0.000 claims abstract description 16
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 13
- 230000000694 effects Effects 0.000 description 13
- 229910052708 sodium Inorganic materials 0.000 description 13
- 239000011734 sodium Substances 0.000 description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 9
- 229910052787 antimony Inorganic materials 0.000 description 9
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 9
- 229910052698 phosphorus Inorganic materials 0.000 description 9
- 239000011574 phosphorus Substances 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 229910000676 Si alloy Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000007872 degassing Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- IHGSAQHSAGRWNI-UHFFFAOYSA-N 1-(4-bromophenyl)-2,2,2-trifluoroethanone Chemical compound FC(F)(F)C(=O)C1=CC=C(Br)C=C1 IHGSAQHSAGRWNI-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001278 Sr alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 150000003385 sodium Chemical class 0.000 description 1
- 229910002058 ternary alloy Inorganic materials 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- 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
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
Definitions
- the present invention relates to an aluminum master alloy.
- Primary and secondary aluminum / silicon alloys are widely used in foundries for various applications in fields such as the automobile, mechanics, energy, aeronautics or space.
- the structure of the alloy becomes acicular because the phosphorus combines with aluminum to form dendrites of aluminum phosphide.
- aluminum alloys all have phosphorus
- sodium added to an aluminum / silicon alloy containing 10 ppm of phosphorus in amounts varying between 10 to 150 ppm leads to a fibrous structure because it inhibits the development of germs. aluminum phosphide.
- the disadvantage of sodium is that it presents a danger to the environment because sodium vapors are toxic and above all it is flammable in contact with air and explosive in contact with water, which makes it a delicate product to handle in a parts manufacturing industry, in particular by molding.
- Another disadvantage is the transience of its effects because it is volatile. In addition, it increases the tendency to gassing therefore to porosity.
- the inclusions present in sodium-containing baths can retain hydrogen absorbed on the surface and promote the growth of bubbles. Sodium also increases the surface tension of the alloy which decreases the flowability.
- strontium has effects similar to those of sodium and it is commonly used at levels of 80 to 500 ppm.
- the structure obtained is fibrous but this element is also a delicate product to handle given its high reactivity with water. Its effect is semi-permanent, which makes it a little easier to control without causing attack of the refractory linings but it also increases the tendency to gassing and especially it has very little influence on the shrinkage of the alloy.
- antimony leads to a modification of the structure but the result is a lamellar structure, more particularly when the parts are cooled quickly, this with contents ranging between 0.008 and 0.15% by weight compared to the alloy and a phosphorus content of less than 5 ppm.
- Antimony has a permanent effect on the structure but it cannot be used for secondary alloys because the level of phosphorus is too high in the recycling alloys, which inhibits the effects of antimony.
- the sodium / antimony couple if one of the elements predominates, the resulting effects are those of the element present in greater quantity, and if the two elements are in equivalent quantities, their respective effects are inhibited by others.
- the present invention relates to an aluminum master alloy intended to be associated with aluminum castings of first or second fusion, which removes the sodium, which can be prepared in the form of monoblock ingots, breakable ingots or in the form yarn, which causes a large decrease in shrinkage and which is of a low price especially in the quantities used.
- the present invention relates to an aluminum master alloy, intended for the modification of the characteristics of an aluminum / silicon or aluminum / silicon / copper bath which is characterized by an addition of strontium of between 3 and 15% by weight and an addition of calcium between 1 and 10% by weight.
- The% by weight are expressed in% by weight of the ternary alloy obtained, as is common in the field of metallurgy.
- the aluminum master alloy intended to be introduced into a casting alloy bath is characterized in that it comprises 3 to 15% by weight of strontium and 1 to 10% of calcium.
- the aluminum parent alloy comprises 8 to 10% by weight of strontium and 2 to 4% by weight of calcium.
- it comprises 4 to 6% by weight of strontium and 1 to 3% by weight of calcium.
- the alloy according to the invention is in the form of breakable bars in equivalent portions.
- a spectrographic analysis disc is taken to check the contents obtained. If the analysis is within the expected ranges, casting can begin.
- the alloy is a secondary AS7U3G.
- a quantity of 750 g of AlSr10Ca3 mother alloy or 1.5 kg of AlSr5Ca2 mother alloy is introduced into the bottom of the bag, before filling.
- the liquid metal is then transferred from the melting furnace into the ladle by tilting, at a temperature of 750 ° C. for example.
- degassing with nitrogen or argon is carried out using porous plugs or a turbine, for 10 to 20 minutes.
- the master alloy dissolves.
- a spectrometric analysis is carried out, then the ladle can be directly poured into a holding furnace or a low pressure furnace for casting the parts.
- the final content of strontium and calcium is in this case between 100 ppm and 130 ppm for strontium, and between 30 and 45 ppm for calcium, because a small part of strontium and calcium is lost during the degassing operation.
- the master alloys which are the subject of the present invention can thus modify aluminum / silicon, aluminum / silicon / copper alloys. intended for the various manufacturing methods, sand, shell or low pressure.
- the content of master alloy must be adjusted as a function of the content of harmful impurities, phosphorus and / or antimony, of the alloy to be modified, of the silicon content and of the casting process used depending on the speed of cooling.
- the AlSr10Ca3 mother alloy is moreover easily breakable and each ingot bar can be made up of equal parts corresponding to a given amount of strontium and calcium.
- the goal is to reach values of 80 to 300 ppm of strontium and 30 to 90 ppm of calcium, in the alloy ready for casting.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
La présente invention concerne un alliage-mère d'aluminium.The present invention relates to an aluminum master alloy.
Les alliages aluminium/silicium de première et seconde fusion sont très répandus en fonderie pour des applications diverses dans des domaines tels que l'automobile, la mécanique, l'énergie, l'aéronautique ou le spatial.Primary and secondary aluminum / silicon alloys are widely used in foundries for various applications in fields such as the automobile, mechanics, energy, aeronautics or space.
On sait que suivant la structure de l'alliage obtenu, les propriétés de fonderie donc les performances et aptitudes au moulage et les caractéristiques mécaniques varient.It is known that depending on the structure of the alloy obtained, the foundry properties therefore the performance and aptitudes for molding and the mechanical characteristics vary.
Bien entendu, d'autres paramètres tels que la vitesse de refroidissement, le taux d'impuretés ou les conditions de traitement thermique, influencent aussi les caractéristiques mécaniques.Of course, other parameters such as the cooling rate, the rate of impurities or the heat treatment conditions also influence the mechanical characteristics.
Dans le brevet US-A-1.387.900, on a décrit le rôle de la morphologie de l'eutectique, aluminium/silicium et les effets sur les propriétés mécaniques finales et sur les caractéristiques de fonderie. En effet, un alliage d'aluminium/silicium avec des pourcentages de haute pureté, c'est-à-dire contenant des impuretés telles que du phosphore, du sodium, du strontium et de l'antimoine à raison de traces, tout au plus 1 ppm, la structure de l'alliage est du type lamellaire fine.In US-A-1,387,900, the role of the eutectic, aluminum / silicon morphology and the effects on final mechanical properties and on foundry characteristics have been described. In fact, an aluminum / silicon alloy with high purity percentages, that is to say containing impurities such as phosphorus, sodium, strontium and antimony in traces, at most 1 ppm, the structure of the alloy is of the fine lamellar type.
Si l'on ajoute une faible quantité de phosphore, la structure de l'alliage devient aciculaire car le phosphore se combine à l'aluminium pour former des dendrites de phosphure d'aluminium.If a small amount of phosphorus is added, the structure of the alloy becomes acicular because the phosphorus combines with aluminum to form dendrites of aluminum phosphide.
Sachant que les alliages d'aluminium présentent tous du phosphore, du sodium ajouté à un alliage d'aluminium/silicium contenant 10 ppm de phosphore dans des quantités variant entre 10 à 150 ppm conduit à une structure fibreuse car il inhibe le développement des germes de phosphure d'aluminium.Knowing that the aluminum alloys all have phosphorus, sodium added to an aluminum / silicon alloy containing 10 ppm of phosphorus in amounts varying between 10 to 150 ppm leads to a fibrous structure because it inhibits the development of germs. aluminum phosphide.
Le sodium agit bien sur la structure et permet d'obtenir une structure fibreuse telle que recherchée et il diminue la tendance à la retassure.Sodium acts well on the structure and makes it possible to obtain a fibrous structure as desired and it reduces the tendency to shrink.
L'inconvénient du sodium, c'est qu'il présente un danger pour l'environnement car les vapeurs de sodium sont toxiques et surtout il est inflammable au contact de l'air et explosif au contact de l'eau, ce qui en fait un produit délicat à manipuler dans une industrie de fabrication de pièces, notamment par moulage.The disadvantage of sodium is that it presents a danger to the environment because sodium vapors are toxic and above all it is flammable in contact with air and explosive in contact with water, which makes it a delicate product to handle in a parts manufacturing industry, in particular by molding.
Un autre inconvénient est la fugacité de ses effets car il est volatile. De plus, il augmente la tendance au gazage donc à la porosité. Les inclusions présentes dans les bains contenant du sodium peuvent retenir de l'hydrogène absorbé en surface et favoriser la croissance des bulles. Le sodium augmente également la tension superficielle de l'alliage ce qui diminue la coulabilité.Another disadvantage is the transience of its effects because it is volatile. In addition, it increases the tendency to gassing therefore to porosity. The inclusions present in sodium-containing baths can retain hydrogen absorbed on the surface and promote the growth of bubbles. Sodium also increases the surface tension of the alloy which decreases the flowability.
Enfin, cet élément attaque les poteyages et les réfractaires de fours.Finally, this element attacks poteyages and refractory furnaces.
On sait aussi que le strontium a des effets similaires à ceux du sodium et il est couramment utilisé à des teneurs de 80 à 500 ppm.It is also known that strontium has effects similar to those of sodium and it is commonly used at levels of 80 to 500 ppm.
La structure obtenue est fibreuse mais cet élément est également un produit délicat à manipuler compte tenu de sa forte réactivité avec l'eau. Son effet est semi-permanent, ce qui le rend un peu plus aisé à maîtriser sans provoquer d'attaque des revêtements réfractaires mais il augmente aussi la tendance au gazage et surtout il n'a que très peu d'influence sur la retassure de l'alliage.The structure obtained is fibrous but this element is also a delicate product to handle given its high reactivity with water. Its effect is semi-permanent, which makes it a little easier to control without causing attack of the refractory linings but it also increases the tendency to gassing and especially it has very little influence on the shrinkage of the alloy.
Un autre élément, l'antimoine conduit à une modification de la structure mais le résultat est une structure lamellaire, plus particulièrement lorsque les pièces sont refroidies rapidement, ceci avec des teneurs comprises entre 0,008 et 0,15 % en poids rapporté à l'alliage et une teneur en phosphore inférieure à 5 ppm.Another element, antimony leads to a modification of the structure but the result is a lamellar structure, more particularly when the parts are cooled quickly, this with contents ranging between 0.008 and 0.15% by weight compared to the alloy and a phosphorus content of less than 5 ppm.
L'antimoine a un effet permanent sur la structure mais il ne peut pas être utilisé pour les alliages de seconde fusion parce que le taux de phosphore est trop important dans les alliages de recyclage, ce qui inhibe les effets de l'antimoine.Antimony has a permanent effect on the structure but it cannot be used for secondary alloys because the level of phosphorus is too high in the recycling alloys, which inhibits the effects of antimony.
ll a surtout un inconvénient majeur, il n'a pas d'effet sur la retassure. Ces éléments pris isolément ont des effets ainsi qu'indiqués mais l'homme de l'art sait aussi que ces trois éléments sodium, strontium, antimoine interagissent pour un même taux de phosphore considéré comme inférieur à 10 ppm.lt has above all a major drawback, it has no effect on shrinkage. These elements taken in isolation have effects as indicated but those skilled in the art also know that these three elements sodium, strontium, antimony interact for the same level of phosphorus considered to be less than 10 ppm.
Dans le cas du couple sodium/antimoine, si l'un des éléments prédomine, les effets résultants sont ceux de l'élément présent en plus grande quantité, et si les deux éléments sont en quantités équivalentes, leurs effets respectifs sont inhibés les uns par les autres.In the case of the sodium / antimony couple, if one of the elements predominates, the resulting effects are those of the element present in greater quantity, and if the two elements are in equivalent quantities, their respective effects are inhibited by others.
Dans le cas du couple antimoine/strontium, si l'un des éléments prédomine, les effets sont de nouveau ceux de l'élément présent en plus grande quantité. A quantité égale, il s'agit des caractéristiques obtenues avec le strontium mais affaiblies dans leurs effets par la présence de l'antimoine.In the case of the antimony / strontium couple, if one of the elements predominates, the effects are again those of the element present in greater quantity. For an equal amount, these are the characteristics obtained with strontium but weakened in their effects by the presence of antimony.
Dans le cas du couple sodium/strontium, il n'y a pas d'incompatibilité. Les effets des deux éléments s'ajoutent.In the case of the sodium / strontium couple, there is no incompatibility. The effects of the two elements are added.
Les techniques actuelles comme le dégazage à l'azote, les lavages-désoxydation et le contrôle de l'atmosphère des fours ont permis d'améliorer les alliages modifiés au sodium et au strontium.Current techniques such as nitrogen degassing, deoxidation washes and furnace atmosphere control have improved the modified sodium and strontium alloys.
Néanmoins, les problèmes liés au sodium subsistent.However, the sodium problems remain.
La présente invention a pour objet un alliage-mère d'aluminium destiné à être associé avec des coulées d'aluminium de première ou seconde fusion, qui supprime le sodium, qui peut être préparé sous forme de lingots monoblocs, de lingots sécables ou sous forme de fils, qui provoque une forte diminution de la retassure et qui est d'un prix peu élevé surtout dans les quantités utilisées.The present invention relates to an aluminum master alloy intended to be associated with aluminum castings of first or second fusion, which removes the sodium, which can be prepared in the form of monoblock ingots, breakable ingots or in the form yarn, which causes a large decrease in shrinkage and which is of a low price especially in the quantities used.
La présente invention concerne un alliage-mère d'aluminium, prévu pour la modification des caractéristiques d'un bain d'aluminium/silicium ou d'aluminium/silicium/cuivre qui se caractérise par une adjonction de strontium comprise entre 3 et 15 % en poids et une adjonction de calcium comprise entre 1 et 10 % en poids. Les % en poids sont exprimés en % en poids de l'alliage ternaire obtenu, comme cela est courant dans le domaine de la métallurgie.The present invention relates to an aluminum master alloy, intended for the modification of the characteristics of an aluminum / silicon or aluminum / silicon / copper bath which is characterized by an addition of strontium of between 3 and 15% by weight and an addition of calcium between 1 and 10% by weight. The% by weight are expressed in% by weight of the ternary alloy obtained, as is common in the field of metallurgy.
Plus particulièrement, l'alliage-mère d'aluminium destiné à être introduit dans un bain d'alliage de coulée se caractérise en ce qu'il comprend 3 à 15 % en poids de strontium et 1 à 10 % de calcium.More particularly, the aluminum master alloy intended to be introduced into a casting alloy bath is characterized in that it comprises 3 to 15% by weight of strontium and 1 to 10% of calcium.
Plus particulièrement, l'alliage-mère d'aluminium comprend 8 à 10 % en poids de strontium et 2 à 4 % en poids de calcium.More particularly, the aluminum parent alloy comprises 8 to 10% by weight of strontium and 2 to 4% by weight of calcium.
Suivant une variante, il comprend 4 à 6 % en poids de strontium et 1 à 3 % en poids de calcium.According to a variant, it comprises 4 to 6% by weight of strontium and 1 to 3% by weight of calcium.
L'alliage selon l'invention se présente sous forme de barres sécables en portions équivalentes.The alloy according to the invention is in the form of breakable bars in equivalent portions.
Selon une variante, il se présente sous la forme de fils.Alternatively, it is in the form of son.
L'invention est décrite ci-après, en donnant un premier et un second modes d'application d'un tel alliage-mère.The invention is described below, giving first and second modes of application of such a master alloy.
On dispose d'un four d'une capacité de 500 kg d'alliage aluminium/silicium AS7G06 maintenu entre 720°C et 760°C par exemple. On introduit dans le bain liquide 750 g d'alliage-mère AlSr10Ca3 pour une teneur visée de 150 ppm de strontium et de 45 ppm de calcium dans le bain d'AS7G. Il faut attendre 15 mn pour permettre une bonne dissolution de l'alliage.There is an oven with a capacity of 500 kg of aluminum / silicon alloy AS7G06 maintained between 720 ° C and 760 ° C for example. 750 g of AlSr10Ca3 mother alloy are introduced into the liquid bath for a targeted content of 150 ppm of strontium and 45 ppm of calcium in the AS7G bath. It is necessary to wait 15 minutes to allow a good dissolution of the alloy.
Après cette période d'homogénéisation, un disque d'analyse spectrographique est prélevé pour vérifier les teneurs obtenues. Si l'analyse est dans les fourchettes prévues, la coulée peut commencer.After this homogenization period, a spectrographic analysis disc is taken to check the contents obtained. If the analysis is within the expected ranges, casting can begin.
On veut transférer du métal liquide d'un four de fusion dans un four de maintien ou dans un four de machine basse pression à l'aide d'une poche de transfert de 500 kg. L'alliage est un AS7U3G de seconde fusion.We want to transfer liquid metal from a melting furnace to a holding furnace or to a low pressure machine furnace using a 500 kg transfer bag. The alloy is a secondary AS7U3G.
On introduit dans le fond de la poche, avant remplissage, une quantité de 750 g d'alliage-mère AlSr10Ca3 ou de 1,5 kg d'alliage-mère AlSr5Ca2.A quantity of 750 g of AlSr10Ca3 mother alloy or 1.5 kg of AlSr5Ca2 mother alloy is introduced into the bottom of the bag, before filling.
Le métal liquide est alors transféré du four de fusion dans la poche de coulée par basculement, à une température de 750°C par exemple.The liquid metal is then transferred from the melting furnace into the ladle by tilting, at a temperature of 750 ° C. for example.
Une fois la poche remplie, on procède à un dégazage à l'azote ou à l'argon à l'aide de bouchons poreux ou d'une turbine, pendant 10 à 20 mn.Once the bag is filled, degassing with nitrogen or argon is carried out using porous plugs or a turbine, for 10 to 20 minutes.
Durant le dégazage, l'alliage-mère se dissout. On effectue une analyse spectrométrique, puis la poche peut être directement versée dans un four de maintien ou un four basse pression pour la coulée des pièces.During degassing, the master alloy dissolves. A spectrometric analysis is carried out, then the ladle can be directly poured into a holding furnace or a low pressure furnace for casting the parts.
La teneur finale en strontium et calcium est comprise dans ce cas entre 100 ppm et 130 ppm pour le strontium, et entre 30 et 45 ppm pour le calcium, car on perd une petite part de strontium et de calcium pendant l'opération de dégazage.The final content of strontium and calcium is in this case between 100 ppm and 130 ppm for strontium, and between 30 and 45 ppm for calcium, because a small part of strontium and calcium is lost during the degassing operation.
Les alliages-mère objet de la présente invention peuvent ainsi modifier des alliages d'aluminium/silicium, d'aluminium/silicium/cuivre destinés aux différents modes de fabrication, au sable, en coquille ou basse pression.The master alloys which are the subject of the present invention can thus modify aluminum / silicon, aluminum / silicon / copper alloys. intended for the various manufacturing methods, sand, shell or low pressure.
La teneur d'alliage-mère doit être ajustée en fonction de la teneur en impuretés néfastes, phosphore et/ou antimoine, de l'alliage à modifier, de la teneur en silicium et du procédé de coulée utilisée suivant la rapidité du refroidissement.The content of master alloy must be adjusted as a function of the content of harmful impurities, phosphorus and / or antimony, of the alloy to be modified, of the silicon content and of the casting process used depending on the speed of cooling.
L'alliage-mère AlSr10Ca3 est de plus facilement sécable et chaque barreau lingot peut être constitué de parties égales correspondant à une quantité donnée de strontium et de calcium.The AlSr10Ca3 mother alloy is moreover easily breakable and each ingot bar can be made up of equal parts corresponding to a given amount of strontium and calcium.
Le but est d'atteindre des valeurs de 80 à 300 ppm de strontium et de 30 à 90 ppm de calcium, dans l'alliage prêt à la coulée.The goal is to reach values of 80 to 300 ppm of strontium and 30 to 90 ppm of calcium, in the alloy ready for casting.
On a pu alors constater une structure fibreuse de l'eutectique aluminium/silicium, synonyme d'une bonne modification, sans altération de la coulabilité, avec une forte diminution de la tendance à la retassure et une porosité acceptable.It was then possible to observe a fibrous structure of the aluminum / silicon eutectic, synonymous with a good modification, without alteration of the flowability, with a strong decrease in the tendency to shrinkage and an acceptable porosity.
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9513818 | 1995-11-16 | ||
| FR9513818A FR2741359B1 (en) | 1995-11-16 | 1995-11-16 | ALUMINUM MOTHER ALLOY |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0774521A1 true EP0774521A1 (en) | 1997-05-21 |
Family
ID=9484783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96450021A Withdrawn EP0774521A1 (en) | 1995-11-16 | 1996-11-13 | Aluminium master alloy |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0774521A1 (en) |
| FR (1) | FR2741359B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005056846A1 (en) * | 2003-12-02 | 2005-06-23 | Worcester Polytechnic Institute | Casting of aluminum based wrought alloys and aluminum based casting alloys |
| EP2333122A1 (en) * | 2009-11-20 | 2011-06-15 | Korea Institute of Industrial Technology | Aluminum alloy and manufacturing method thereof |
| EP2339037A1 (en) * | 2009-11-20 | 2011-06-29 | Korea Institute of Industrial Technology | Aluminum alloy and manufacturing method thereof |
| CN111363939A (en) * | 2020-03-27 | 2020-07-03 | 山东滨州华创金属有限公司 | Preparation process of aluminum-strontium intermediate alloy wire rod |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007042494B4 (en) * | 2007-09-03 | 2009-09-24 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Component as well as its use |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1387900A (en) | 1920-02-13 | 1921-08-16 | Pacz Aladar | Alloy |
| FR2020663A1 (en) * | 1968-10-14 | 1970-07-17 | Sueddeutsche Kalkstickstoff | |
| FR2314261A1 (en) * | 1975-06-11 | 1977-01-07 | Kawecki Berylco Ind | PROCESS AND MATERIAL COMPOSITION INTENDED TO MODIFY THE EUTECTIC COMPOSITION OF ALUMINUM AND SILICON ALLOYS |
| US4009026A (en) * | 1974-08-27 | 1977-02-22 | Kawecki Berylco Industries, Inc. | Strontium-silicon-aluminum master alloy and process therefor |
| US4937044A (en) * | 1989-10-05 | 1990-06-26 | Timminco Limited | Strontium-magnesium-aluminum master alloy |
| EP0421549A1 (en) * | 1989-10-05 | 1991-04-10 | KBM-Metaalindustrie B.V. | Aluminium-strontium master alloy |
| GB2243620A (en) * | 1990-03-27 | 1991-11-06 | Atsugi Unisia Corp | Improvements in and relating to forming aluminium-silicon alloys |
-
1995
- 1995-11-16 FR FR9513818A patent/FR2741359B1/en not_active Expired - Lifetime
-
1996
- 1996-11-13 EP EP96450021A patent/EP0774521A1/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1387900A (en) | 1920-02-13 | 1921-08-16 | Pacz Aladar | Alloy |
| FR2020663A1 (en) * | 1968-10-14 | 1970-07-17 | Sueddeutsche Kalkstickstoff | |
| US4009026A (en) * | 1974-08-27 | 1977-02-22 | Kawecki Berylco Industries, Inc. | Strontium-silicon-aluminum master alloy and process therefor |
| FR2314261A1 (en) * | 1975-06-11 | 1977-01-07 | Kawecki Berylco Ind | PROCESS AND MATERIAL COMPOSITION INTENDED TO MODIFY THE EUTECTIC COMPOSITION OF ALUMINUM AND SILICON ALLOYS |
| US4937044A (en) * | 1989-10-05 | 1990-06-26 | Timminco Limited | Strontium-magnesium-aluminum master alloy |
| EP0421549A1 (en) * | 1989-10-05 | 1991-04-10 | KBM-Metaalindustrie B.V. | Aluminium-strontium master alloy |
| GB2243620A (en) * | 1990-03-27 | 1991-11-06 | Atsugi Unisia Corp | Improvements in and relating to forming aluminium-silicon alloys |
Non-Patent Citations (1)
| Title |
|---|
| D.BIRCHON: "DICTIONARY OF METALLURGY", 1965, GEORGE NEWNES LTD, LONDON, GB, XP002005400 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005056846A1 (en) * | 2003-12-02 | 2005-06-23 | Worcester Polytechnic Institute | Casting of aluminum based wrought alloys and aluminum based casting alloys |
| EP2333122A1 (en) * | 2009-11-20 | 2011-06-15 | Korea Institute of Industrial Technology | Aluminum alloy and manufacturing method thereof |
| EP2339037A1 (en) * | 2009-11-20 | 2011-06-29 | Korea Institute of Industrial Technology | Aluminum alloy and manufacturing method thereof |
| EP2677049A1 (en) * | 2009-11-20 | 2013-12-25 | Korea Institute of Industrial Technology | Aluminium alloy comprising magnesium and calcium |
| US9200348B2 (en) | 2009-11-20 | 2015-12-01 | Korea Institute Of Industrial Technology | Aluminum alloy and manufacturing method thereof |
| CN111363939A (en) * | 2020-03-27 | 2020-07-03 | 山东滨州华创金属有限公司 | Preparation process of aluminum-strontium intermediate alloy wire rod |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2741359B1 (en) | 1998-01-16 |
| FR2741359A1 (en) | 1997-05-23 |
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