Method of magnesium-bearing nanomodifying agent receiving

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy field and can be used for manufacturing of high-duty cast iron with globular graphite. For receiving of magnesium-bearing nano- modifying agent is blended with water solution of polyvinyl alcohol, chloride of magnesium and iron in molar correlation (10-5):1:1, agreeably, it is evaporated specified mixture before gel formation after what it is implemented carbonation at temperature 350-500°C in atmosphere of inert gas with formation of carbon nanotube, filled by chloride of magnesium and iron.

EFFECT: invention decrease magnesium losses 1,5-2 times with introduction of nano- modifying agents into the cast iron.

6 ex, 1 tbl, 6 dwg

 

The invention relates to the field of metallurgy and can be used in the manufacture of high-strength nodular cast iron.

A method of obtaining magniysoderzhaschee ligatures, including the input of granulated magnesium in the molten flow of silicon-containing Ferroalloy simultaneously with salt additive at a ratio of 10:(0.2 to 1). As salt additive is a mixture of halides of alkali and alkaline earth metals, melting point which is lower than the 50-200°C melting point of magnesium (RF Patent No. 2058416, M CL SS 35/00, SS 1/10, 20.04.1996).

The disadvantage of this method is that with the introduction of granular magnesium in the molten ferrosilicon significant loss of magnesium due to its evaporation, since the evaporation temperature of the metal magnesium (1120°C) below the melting temperature of ferrosilicon 1220-1400°C. Not excluded the loss of magnesium in the inoculant is added to the iron, as salt additive evaporates at the temperature of melting cast iron. Decreases also as a modification of nodular cast iron.

Another disadvantage of the above method is the need to implement costly metallurgical equipment: induction furnace, ladle feeder, a powerful source of electrical energy. You will need according to the corresponding energy consumption for melting and technological overheating of ferrosilicon in the limit of 1400-1500°C. Therefore, use of this method requires significant depreciation and energy costs.

A method of obtaining metal-containing carbon nanostructures of organic compounds with the addition of inorganic salts, which comprises heating to 300°C a mixture of polyvinyl alcohol and chlorides of the metals, in particular chloride copper (1) or (2)taken in a molar ratio of polyvinyl alcohol: chloride copper (20-1):1. The initial mixture of polyvinyl alcohol and chloride of copper (2) is prepared by mixing solutions of these compounds, with subsequent drying to obtain a gel (RF Patent No. 2221744, M. CL. SW 31/02, WV 3/00, published. 20.01.2004).

The disadvantage of this method is that it is used to obtain a copper-containing carbon nanostructures and cannot be used to obtain a modifier for the spheroidizing of carbon in cast iron, as the copper is not spheroidizing element.

The problem solved by the invention is to obtain a modifier having a set of properties for the production of high-strength nodular cast iron.

The method of obtaining the magnesium-containing modifier necessary is characterized by the fact that the mixed aqueous solutions of polyvinyl alcohol, chlorides of magnesium and iron taken in a molar ratio of (5-10):1:1, respectively, is evaporated specified compounds is the formation of gel, followed by carbonization at a temperature of 350-500°C in an atmosphere of inert gas with the formation of carbon nanotubes filled with chloride of magnesium and iron.

In the process of obtaining of nano modifiers mixed aqueous solutions of polyvinyl alcohol, chlorides of magnesium and iron, and then evaporated with the formation of the gel, which is a preliminary stage before carbonization. In the carbonization process are formed carbon nanotubes partially filled with magnesium chloride and ferric chloride, i.e. magnesium chloride and ferric chloride are prisoners in carbon nanotubes. The carbonation in the atmosphere of inert gas provides additional protection from oxidation magnesium, iron, carbon. When entering into liquid iron nanotubes are exempt from magnesium chloride and ferric chloride. Magnesium provides spheroidization iron, ferric chloride contributes to the immersion of the alloy into the melt. Carbon nanotubes contribute to the grinding of grain cast iron. When you enter the modifier necessary in the iron loss of magnesium is not significant as it is encapsulated in nanotubes. When the ratio of polyvinyl alcohol to magnesium chloride and ferric chloride in a heated mixture of more than (10):1:1 are formed nanotubes, not filled with magnesium chloride and ferric chloride, so the modifier does not sink in the molten metal, which increases the burning magnesium. Dropping effectsdipyridamole.

When the ratio of polyvinyl alcohol to magnesium chloride and ferric chloride in a heated mixture of less than (5):1:1 magnesium chloride and ferric chloride partially out of carbon nanotubes and with the introduction of nano modifiers in iron increase the loss of magnesium. The modification is not effective.

When the temperature of the mixture is less than 350°C carbonization occurs, when the heating temperature greater than 500°begins With the destruction of the nanotubes.

Thus, the technical result of this method is the reduction of losses of magnesium upon receipt of the modifier and the reduction of his stupor when the modification by enclosing it in nanotubes. In addition, we reduced the energy cost of obtaining modifier.

The invention is illustrated by drawings, where figure 1, 2, 3, 4, 5, 6 presents the fragments of magnesium-containing modifier necessary. The proposed method of producing magnesium-containing of nano modifiers implemented as follows.

Example 1

Mixed aqueous solutions of polyvinyl alcohol (PVA), chlorides of magnesium and iron in a molar ratio of PVA:MgCl2:FeCl2=10:1:1. The mixture solution was poured to a thickness of 5 mm in a ceramic bowl. The mixture of the solutions evaporated at a temperature of 100°C with the formation of the gel, and then spent the carbonization by heating to a temperature of 350°C in an atmosphere of arg is on. Figure 1 shows a fragment of the structure of nanotubes filled with chlorides of magnesium and iron.

Example 2

Mixed aqueous solutions of polyvinyl alcohol (PVA), chlorides of magnesium and iron in a molar ratio of PVA:MgCl2:FeCl2=10:1:1. The mixture solution was poured to a thickness of 5 mm in a ceramic bowl. The mixture of the solutions evaporated at a temperature of 100°C with the formation of the gel, and then spent the carbonization by heating to a temperature of 500°C in argon atmosphere. The structure of the obtained nano modifiers shown in figure 2, similar to the one shown in figure 1.

Example 3

Mixed aqueous solutions of polyvinyl alcohol (PVA), chlorides of magnesium and iron in a molar ratio of PVA:MgCl2:FeCl2=5:1:1. The mixture solution was poured to a thickness of 5 mm in a ceramic bowl. The mixture of the solutions evaporated at a temperature of 100°C with the formation of the gel, and then spent the carbonization by heating in an argon atmosphere to a temperature of 350°C. figure 3 shows a fragment of the structure of nanotubes filled with chlorides of magnesium and iron.

Example 4

Mixed aqueous solutions of polyvinyl alcohol (PVA), chlorides of magnesium and iron in a molar ratio of PVA:MgCl2:FeCl2=5:1:1. The mixture solution was poured to a thickness of 5 mm in a ceramic bowl. The mixture of the solutions evaporated at a temperature of 100°C with the formation of the gel, and then spent ka is bonitati when heated in an argon atmosphere to a temperature of 500°C. The structure of the obtained nano modifiers shown in figure 4, similar to those shown in figures 1, 2, 3.

Example 5

Mixed aqueous solutions of polyvinyl alcohol (PVA), chlorides of magnesium and iron in a molar ratio of PVA:MgCl2:FeCl2=11:1:1. The mixture solution was poured to a thickness of 5 mm in a ceramic bowl. The mixture of the solutions evaporated at a temperature of 100°C with the formation of the gel, and then spent the carbonization by heating in an argon atmosphere to a temperature of 500°C. figure 5 shows a fragment of the structure of nanotubes, it is seen that the obtained nanotubes, sparsely filled chlorides of magnesium and iron. As a result of this increasing frenzy of magnesium when the inoculant is added to the iron.

Example 6

Mixed aqueous solutions of polyvinyl alcohol (PVA), chlorides of magnesium and iron in a molar ratio of PVA:MgCl2:FeCl3=4:1:1. The mixture solution was poured to a thickness of 5 mm in a ceramic bowl. The mixture of the solutions evaporated at a temperature of 100°C with the formation of the gel, and then spent the carbonization by heating to a temperature of 500°C. figure 6 shows a fragment of the structure of nanotubes, it is seen that the resulting excessive amount of crystalline phase of chlorides of magnesium and iron. As a result of this increasing frenzy of magnesium when you enter the modifier necessary in cast iron.

When the temperature of heating a mixture of less than 350°C and above 500°C, meet single what s nanotubes, that does not allow the product to be used as a modifier.

The study of the structure and composition of the obtained products of carbonization was carried out using transmission electron microscopy transmission electron microscope JEM-200CX.

The resulting modifier was tested at the time of receipt of nodular cast iron brand VC, the results of the experiments are given in table 1, which showed that when the inoculant is added to the molten cast iron is formed spherical graphite, the best are the examples 1, 2, 3, 4. The number entered in the cast iron of nano modifiers were determined by calculation. Upon receipt of modifier necessary almost completely excluded losses of magnesium, reduces the loss of magnesium in the input modifier necessary in cast iron.

The proposed method of producing magnesium-containing of nano modifiers allows you to get the modifier to obtain nodular cast iron, virtually eliminate the loss of magnesium upon receipt of the modifier, the frenzy of magnesium when inoculation is reduced to 1.5-2 times. The way Energetichesky low-cost.

The method of obtaining the magnesium-containing modifier necessary, characterized in that the mixed aqueous solutions of polyvinyl alcohol, chlorides of magnesium and iron in a molar ratio (10-5):1:1, respectively, is evaporated from azanuy mixture to gel formation, followed by carbonization at a temperature of 350-500°C in an atmosphere of inert gas with the formation of carbon nanotubes filled with chloride of magnesium and iron.



 

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FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy field, particularly to magnesium-bearing ligature making practice for high-strength ligatures, used for manufacturing of hard part, for instance automobile crankshaft. Ligature contains, wt %: magnesium 17-20, cerium 0.4-0.6, copper is the rest. In the method in the capacity of integumentary flux it is used powdered baric flux, which is charged on magnesium, copper is fractional introduced: at first 60-70 wt % of its total amount, and then - by 10 wt % by components melting with addition of flux for saving of melt blanket, process is implemented at the temperature 725-800°C, chosen on the basis of binary constitution diagram Mg-Cu, during 40-60 min with conclusive layer induction of refining flux of thickness 1-2 cm and introduction of cerium with solid subsurface mixing of received ligature. Then ligature is crushed for pieces 2-4 kg, after what it is introduced into the cast iron in amount 0.65-0.85 wt % of cast iron weight.

EFFECT: distribution uniformity of alloying ingredients with increased grade of ligature assimilation, hardening and increasing of cast iron wear resistance, stability and safety of its receiving methods and usage, and also cost cutting for energy carriers and cost reduction of used components.

3 cl, 3 ex, 1 tbl

FIELD: metallurgy.

SUBSTANCE: invention concerns metallurgy field, foundry. Particularly it concerns control modes of grey and high-duty cast iron and can be used at single-piece, large-scale and mass production of cast iron castings. In method there is received basic alloy of cast iron with usage of alloying, modifying and graphitising admixtures, process qualities are controlled and corrected including operation by effect of spheroidising and vermiculising modification at the section of casting mold charging. It is implemented one-time ladleman cast iron treatment, making preliminary calculation the quantity of alloying, modifying and graphitising admixtures depending on weight of liquid metal, containing of sulphur and oxygen, basic elements and alloying inside of basic cast iron melt and time of holding modifying effect, at that control of all process parameters is outfitted by overall video surveillance system for manufacturing operations with registration and delivering of received results into computer data base and to the lighting panel. Finishing of modifying effect is alerted by acoustic alarm.

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3 tbl

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1 tbl, 1 ex

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11 cl, 4 dwg, 3 tbl, 7 ex

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1 ex, 1 tbl

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1 ex

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4 cl, 1 ex, 2 dwg

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3 cl, 1 tbl, 1 ex

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1 tbl, 2 ex

FIELD: physics.

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5 cl, 1 tbl, 4 ex, 1 dwg

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9 cl, 12 ex, 1 tbl, 5 dwg

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39 cl, 11 dwg

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EFFECT: increased proportion of diamond structure in product and increased its storage stability.

2 cl

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