CN113106186A - Preparation method of inoculant for tough cast iron - Google Patents
Preparation method of inoculant for tough cast iron Download PDFInfo
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- CN113106186A CN113106186A CN202110429819.XA CN202110429819A CN113106186A CN 113106186 A CN113106186 A CN 113106186A CN 202110429819 A CN202110429819 A CN 202110429819A CN 113106186 A CN113106186 A CN 113106186A
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- inoculant
- alloy
- ferrosilicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/08—Manufacture of cast-iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
Abstract
The invention discloses a preparation method of an inoculant for tough cast iron, belonging to the field of casting, wherein the inoculant is prepared from the following components in parts by mass: 70-90 parts of ferrosilicon, 12-18 parts of zirconium oxide, 4-6 parts of silicon dioxide, 5-10 parts of rare earth magnesium alloy and 1-2 parts of aluminum-calcium alloy; according to the invention, through the blending alloy of the rare earth magnesium alloy and the aluminum calcium alloy, when the alloy is formed with the ferrosilicon into a blend, the alloy can react with nitrogen and hydrogen in an iron liquid to form a high-melting-point compound to become a core of graphite crystal, and in addition, due to the combination of the alloy and a silicon element, a silicon-rich area can be formed, which is beneficial to the precipitation of graphite, and the toughness of a casting is stronger.
Description
Technical Field
The invention belongs to the field of casting, and particularly relates to a preparation method of an inoculant for tough cast iron.
Background
In the casting field, the hardness of a casting is represented by the wear resistance of steel, cast iron with higher hardness has higher wear resistance, the cast iron with high wear resistance is frequently used in the industrial field, and the cast iron with better wear resistance can also be used for ball milling of a ball mill or milling parts such as a lining plate and the like. At present, most cast irons contain 2% -3% of carbon, but part of carbide easily causes low toughness of castings, and when the prepared castings are large in size or complex in shape, a plurality of cracks can appear, so that the castings can only become waste products, steel resources are wasted, matrix structures of the castings can also change, and other accidents can occur in the using process.
The inoculant can refine grains so as to change the chilling tendency, the inoculant can improve the toughness of the cast iron after modification treatment through inoculation treatment of the inoculant on the cast iron, but the development of the current cast iron inoculant enters the bottleneck, the toughness of the cast iron can be further improved, and the inoculant for refining the cast iron crystals becomes a hot point of research.
Disclosure of Invention
Aiming at the problems in the prior art, the invention discloses a preparation method of an inoculant for tough cast iron.
The invention is realized by the following steps:
the preparation method of the inoculant for the tough cast iron is characterized in that the inoculant is prepared from the following components in parts by mass: 70-90 parts of ferrosilicon, 12-18 parts of zirconium oxide, 4-6 parts of silicon dioxide, 5-10 parts of rare earth magnesium alloy and 1-2 parts of aluminum-calcium alloy, wherein the preparation method of the inoculant comprises the following steps:
step one, blending 12-18 parts of zirconium oxide and 4-6 parts of silicon dioxide under an alkaline condition for 3-5 hours, then reacting at a high temperature, and sintering to form zirconium silicate;
adding 35-45 parts of ferrosilicon into zirconium silicate, putting the zirconium silicate into a high-temperature electric furnace for co-melting, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, stirring for 1-2 hours, preserving the heat for 1-2 hours, rapidly cooling by using cold water, and crushing into small blocks of 10-20 mm for later use;
step three, placing 35-45 parts of ferrosilicon in a high-temperature electric furnace, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, placing the molten ferrosilicon, 5-10 parts of rare earth magnesium alloy and 1-2 parts of aluminum-calcium alloy in a foundry ladle, mixing until the rare earth magnesium alloy and the aluminum-calcium alloy are completely molten, and forming a magnesium-aluminum-calcium-iron intermediate alloy in the step three; standing and cooling the molten magnesium-aluminum-calcium-iron intermediate alloy, and then crushing the intermediate alloy into a blocky intermediate alloy which is 20-30 mm blocky for later use;
step four, uniformly mixing the fragments of the intermediate alloy in the step three and the silicate blocks of zirconium in the step two, simultaneously placing the mixture in an extrusion die, and extruding the mixture into the shape of the die, namely the ingot-shaped inoculant;
and step five, extruding the ingot-shaped inoculant into materials, and cutting the materials into strips for later use to obtain the inoculant for the tough cast iron.
Further, 12-18 parts of zirconium oxide and 4-6 parts of silicon dioxide
And furthermore, the ferrosilicon obtained in the second step and the third step is the same in parts by mass.
Furthermore, the extrusion die is a group of dish-type containers with large upper openings and small bottoms; the dish-type containers are oppositely arranged.
Crushing the mixture into 10-20 mm small blocks in the second step; and in the third step, the mixture is crushed into small blocks of 20-30 mm.
The beneficial effects of the invention and the prior art are as follows:
the components of the invention adopt zirconium oxide and silicon dioxide, wherein zirconium oxide and silicon dioxide elements have zirconium-containing components in iron liquid after sintering, and the composition containing zirconium and silicon iron can promote the precipitation of graphite, reduce the white cast tendency of iron castings and have the deoxidation effect;
when the alloy is mixed with ferrosilicon, the alloy can react with nitrogen and hydrogen in iron liquid to form a high-melting-point compound which becomes the core of graphite crystal, and in addition, because the alloy is combined with silicon element, a silicon-rich area can be formed, which is beneficial to the precipitation of graphite and has stronger toughness of castings;
the rare earth elements of zirconium and magnesium are finally extruded and mixed, and inoculation in molten iron can reduce the nitrogen content in the molten iron, highlight the action of zirconium, prevent the molten iron from absorbing nitrogen, and obtain a better inoculation effect.
Drawings
FIG. 1 is a schematic view of a set of capsule embodiments of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention more clear, the present invention is further described in detail by the following examples. It should be noted that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The inoculant in the embodiment is prepared from the following components in parts by mass: 80 parts of ferrosilicon, 15 parts of zirconia, 5 parts of silicon dioxide (the mass ratio of zirconia to silicon dioxide is 3: 1), 8 parts of rare earth magnesium alloy and 1 part of aluminum-calcium alloy, wherein the preparation method of the inoculant comprises the following specific steps:
step one, blending 15 parts of zirconium oxide and 5 parts of silicon dioxide under an alkaline condition for 3-5 hours, then carrying out a high-temperature reaction, and sintering to form zirconium silicate;
step two, adding 40 parts of ferrosilicon into zirconium silicate, putting the zirconium silicate into a high-temperature electric furnace for co-melting, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, stirring for 1-2 hours, preserving heat for 1-2 hours, rapidly cooling by using cold water, and crushing into small blocks for later use;
step three, placing 40 parts of ferrosilicon in a high-temperature electric furnace, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, until the ferrosilicon is melted, placing 8 parts of molten ferrosilicon, 8 parts of rare earth magnesium alloy and 1 part of aluminum-calcium alloy in a foundry ladle, mixing until the rare earth magnesium alloy and the aluminum-calcium alloy are completely melted, and forming a magnesium-aluminum-calcium-iron intermediate alloy in the step three; standing and cooling the molten magnesium-aluminum-calcium-iron intermediate alloy, and then crushing the intermediate alloy into a blocky intermediate alloy for later use;
step four, uniformly mixing the fragments of the intermediate alloy in the step three and the silicate blocks of zirconium in the step two, simultaneously placing the mixture in an extrusion die, and extruding the mixture into the shape of the die, namely the shape of an ingot-shaped inoculant, wherein the extrusion die is a group of dish-type containers with large upper openings and small bottoms; a group of dish-type containers are oppositely arranged, as shown in figure 1;
and step five, extruding the ingot-shaped inoculant into materials, and cutting the materials into strips for later use to obtain the inoculant for the tough cast iron. The results of the experiment are shown in table 1.
Comparative example 1
The inoculant in the comparative example is prepared from the following components in parts by mass: 80 parts of ferrosilicon, 5 parts of silicon dioxide, 8 parts of rare earth magnesium alloy and 1 part of aluminum-calcium alloy, wherein the preparation method of the inoculant comprises the following steps:
step one, mixing 5 parts of silicon dioxide under an alkaline condition for 3-5 hours, then carrying out a high-temperature reaction, and then sintering;
step two, adding 40 parts of ferrosilicon in the step one, putting the ferrosilicon into a high-temperature electric furnace for co-melting, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, stirring for 1-2 hours, preserving heat for 1-2 hours, rapidly cooling by using cold water, and crushing into small blocks for later use;
step three, placing 40 parts of ferrosilicon in a high-temperature electric furnace, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, until the ferrosilicon is melted, placing 8 parts of molten ferrosilicon, 8 parts of rare earth magnesium alloy and 1 part of aluminum-calcium alloy in a foundry ladle, mixing until the rare earth magnesium alloy and the aluminum-calcium alloy are completely melted, and forming a magnesium-aluminum-calcium-iron intermediate alloy in the step three; standing and cooling the molten magnesium-aluminum-calcium-iron intermediate alloy, and then crushing the intermediate alloy into a blocky intermediate alloy for later use;
step four, uniformly mixing the fragments of the intermediate alloy in the step three and the silicate blocks of zirconium in the step two, simultaneously placing the mixture in an extrusion die, and extruding the mixture into the shape of the die, namely the shape of an ingot-shaped inoculant, wherein the extrusion die is a group of dish-type containers with large upper openings and small bottoms; a group of dish-type containers are oppositely arranged, as shown in a subject 1;
and step five, extruding the ingot-shaped inoculant into materials, and cutting the materials into strips for later use to obtain the inoculant for the tough cast iron.
This comparative example 1 differs from example 1 in that 15 parts of zirconia was not added, and the specific comparative results are shown in table 1.
Comparative example 2
The inoculant in the embodiment is prepared from the following components in parts by mass: 80 parts of ferrosilicon, 15 parts of zirconia, 5 parts of silicon dioxide (the mass ratio of zirconia to silicon dioxide is 3: 1) and 8 parts of rare earth magnesium alloy, wherein the preparation method of the inoculant comprises the following steps:
step one, blending 15 parts of zirconium oxide and 5 parts of silicon dioxide under an alkaline condition for 3-5 hours, then carrying out a high-temperature reaction, and sintering to form zirconium silicate;
step two, adding 40 parts of ferrosilicon into zirconium silicate, putting the zirconium silicate into a high-temperature electric furnace for co-melting, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, stirring for 1-2 hours, preserving heat for 1-2 hours, rapidly cooling by using cold water, and crushing into small blocks for later use;
step three, placing 40 parts of ferrosilicon in a high-temperature electric furnace, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, until the ferrosilicon is melted, placing 8 parts of molten ferrosilicon, 8 parts of rare earth magnesium alloy and 1 part of aluminum-calcium alloy in a foundry ladle, mixing until the rare earth magnesium alloy and the aluminum-calcium alloy are completely melted, and forming a magnesium-aluminum-calcium-iron intermediate alloy in the step three; standing and cooling the molten magnesium-aluminum-calcium-iron intermediate alloy, and then crushing the intermediate alloy into a blocky intermediate alloy for later use;
step four, uniformly mixing the fragments of the intermediate alloy in the step three and the silicate blocks of zirconium in the step two, simultaneously placing the mixture in an extrusion die, and extruding the mixture into the shape of the die, namely the shape of an ingot-shaped inoculant, wherein the extrusion die is a group of dish-type containers with large upper openings and small bottoms; a group of dish-type containers are oppositely arranged, as shown in a subject 1;
and step five, extruding the ingot-shaped inoculant into materials, and cutting the materials into strips for later use to obtain the inoculant for the tough cast iron.
The comparative example 2 is different from the example 1 in that 1 part of the aluminum calcium alloy is not added, and specific comparative results are shown in table 1.
Example 2
The inoculant in the embodiment is prepared from the following components in parts by mass: 70 parts of ferrosilicon, 12 parts of zirconia, 4 parts of silicon dioxide (the mass ratio of zirconia to silicon dioxide is 3: 1), 5 parts of rare earth magnesium alloy and 1 part of aluminum-calcium alloy, wherein the preparation method of the inoculant comprises the following specific steps:
step one, blending 12 parts of zirconium oxide and 4 parts of silicon dioxide under an alkaline condition for 3-5 hours, then carrying out a high-temperature reaction, and sintering to form zirconium silicate;
adding 35 parts of ferrosilicon into zirconium silicate, putting the zirconium silicate into a high-temperature electric furnace for co-melting, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, stirring for 1-2 hours, preserving heat for 1-2 hours, rapidly cooling by using cold water, and crushing into small blocks for later use;
thirdly, placing 35 parts of ferrosilicon in a high-temperature electric furnace, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, until the ferrosilicon is melted, placing the melted ferrosilicon, 5 parts of rare earth magnesium alloy and 1 part of aluminum-calcium alloy in a foundry ladle, mixing until the rare earth magnesium alloy and the aluminum-calcium alloy are completely melted, and forming a magnesium-aluminum-calcium-iron intermediate alloy in the third step; standing and cooling the molten magnesium-aluminum-calcium-iron intermediate alloy, and then crushing the intermediate alloy into a blocky intermediate alloy for later use;
step four, uniformly mixing the fragments of the intermediate alloy in the step three and the silicate blocks of zirconium in the step two, simultaneously placing the mixture in an extrusion die, and extruding the mixture into the shape of the die, namely the shape of an ingot-shaped inoculant, wherein the extrusion die is a group of dish-type containers with large upper openings and small bottoms; the group of dish-type containers are oppositely arranged;
and step five, extruding the ingot-shaped inoculant into materials, and cutting the materials into strips for later use to obtain the inoculant for the tough cast iron. The results of the experiment are shown in table 1.
Example 3
The inoculant in the embodiment is prepared from the following components in parts by mass: 90 parts of ferrosilicon, 18 parts of zirconia, 6 parts of silicon dioxide (the mass ratio of zirconia to silicon dioxide is 3: 1), 10 parts of rare earth magnesium alloy and 2 parts of aluminum-calcium alloy, wherein the preparation method of the inoculant comprises the following specific steps:
step one, blending 18 parts of zirconium oxide and 6 parts of silicon dioxide under an alkaline condition for 3-5 hours, then carrying out a high-temperature reaction, and sintering to form zirconium silicate;
step two, adding 45 parts of ferrosilicon into zirconium silicate, putting the zirconium silicate into a high-temperature electric furnace for co-melting, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, stirring for 1-2 hours, preserving heat for 1-2 hours, rapidly cooling by using cold water, and crushing into small blocks for later use;
step three, taking 45 parts of ferrosilicon, placing the ferrosilicon in a high-temperature electric furnace at the temperature of 1350-1450 ℃ until the ferrosilicon is melted, placing the melted ferrosilicon, 10 parts of rare earth magnesium alloy and 2 parts of aluminum-calcium alloy in a foundry ladle, mixing until the rare earth magnesium alloy and the aluminum-calcium alloy are completely melted, and forming a magnesium-aluminum-calcium-iron intermediate alloy in the step three; standing and cooling the molten magnesium-aluminum-calcium-iron intermediate alloy, and then crushing the intermediate alloy into a blocky intermediate alloy for later use;
step four, uniformly mixing the fragments of the intermediate alloy in the step three and the silicate blocks of zirconium in the step two, simultaneously placing the mixture in an extrusion die, and extruding the mixture into the shape of the die, namely the shape of an ingot-shaped inoculant, wherein the extrusion die is a group of dish-type containers with large upper openings and small bottoms; the group of dish-type containers are oppositely arranged;
and step five, extruding the ingot-shaped inoculant into materials, and cutting the materials into strips for later use to obtain the inoculant for the tough cast iron. The results of the experiment are shown in table 1.
TABLE 1
| Example 1 | Comparative example 1 | Comparative example 2 | Example 2 | Example 3 | |
| Impact value | 49J | _ | _ | 49J | 49J |
In conclusion, the inoculant prepared by the method is stronger in toughness in castings.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (5)
1. The preparation method of the inoculant for the tough cast iron is characterized in that the inoculant is prepared from the following components in parts by mass: 70-90 parts of ferrosilicon, 12-18 parts of zirconium oxide, 4-6 parts of silicon dioxide, 5-10 parts of rare earth magnesium alloy and 1-2 parts of aluminum-calcium alloy, wherein the preparation method of the inoculant comprises the following steps:
step one, blending 12-18 parts of zirconium oxide and 4-6 parts of silicon dioxide under an alkaline condition for 3-5 hours, then reacting at a high temperature, and sintering to form zirconium silicate;
adding 35-45 parts of ferrosilicon into zirconium silicate, putting the zirconium silicate into a high-temperature electric furnace for co-melting, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, stirring for 1-2 hours, preserving the heat for 1-2 hours, rapidly cooling by using cold water, and crushing into small blocks for later use;
step three, placing 35-45 parts of ferrosilicon in a high-temperature electric furnace, setting the temperature of the high-temperature electric furnace to 1350-1450 ℃, placing the molten ferrosilicon, 5-10 parts of rare earth magnesium alloy and 1-2 parts of aluminum-calcium alloy in a foundry ladle, mixing until the rare earth magnesium alloy and the aluminum-calcium alloy are completely molten, and forming a magnesium-aluminum-calcium-iron intermediate alloy in the step three; standing and cooling the molten magnesium-aluminum-calcium-iron intermediate alloy, and then crushing the intermediate alloy into a blocky intermediate alloy for later use;
step four, uniformly mixing the fragments of the intermediate alloy in the step three and the silicate blocks of zirconium in the step two, simultaneously placing the mixture in an extrusion die, and extruding the mixture into the shape of the die, namely the ingot-shaped inoculant;
and step five, extruding the ingot-shaped inoculant into materials, and cutting the materials into strips for later use to obtain the inoculant for the tough cast iron.
2. The method for preparing the inoculant for the tough cast iron according to claim 1, wherein the mass ratio of the zirconium oxide to the silicon dioxide is 3: 1.
3. The method for preparing the inoculant for the tough cast iron according to claim 1, wherein the ferrosilicon taken in the second step and the third step is the same in parts by mass.
4. The method for preparing the inoculant for the tough cast iron according to claim 1, wherein the extrusion die is a group of dish-type containers with large upper openings and small bottoms; the dish-type containers are oppositely arranged.
5. The preparation method of the inoculant for tough cast iron according to claim 1, wherein in the second step, the inoculant is crushed into fine blocks of 10-20 mm; and in the third step, the mixture is crushed into small blocks of 20-30 mm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH556390A (en) * | 1971-12-15 | 1974-11-29 | Stettner & Co | SHAPED INACCULATOR BODY FOR INOCULATING CAST IRON MELT. |
| CN105121061A (en) * | 2013-03-19 | 2015-12-02 | 菲赫贝姆简化股份公司 | Inoculant with surface particles |
| CN106636865A (en) * | 2016-12-15 | 2017-05-10 | 钟小苹 | Composite modifier for gray cast iron of tungsten molybdenum cobalt-silicon iron alloy carrying nano zirconium-silicon oxide and preparation method of composite modifier |
| CN107829017A (en) * | 2017-11-24 | 2018-03-23 | 禹州市恒利来合金有限责任公司 | A kind of sulphur oxygen inovulant of high intensity |
| CN109477154A (en) * | 2016-06-30 | 2019-03-15 | 埃尔凯姆公司 | The method of iron casting inoculant and production iron casting inoculant |
-
2021
- 2021-04-21 CN CN202110429819.XA patent/CN113106186A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH556390A (en) * | 1971-12-15 | 1974-11-29 | Stettner & Co | SHAPED INACCULATOR BODY FOR INOCULATING CAST IRON MELT. |
| CN105121061A (en) * | 2013-03-19 | 2015-12-02 | 菲赫贝姆简化股份公司 | Inoculant with surface particles |
| CN109477154A (en) * | 2016-06-30 | 2019-03-15 | 埃尔凯姆公司 | The method of iron casting inoculant and production iron casting inoculant |
| CN106636865A (en) * | 2016-12-15 | 2017-05-10 | 钟小苹 | Composite modifier for gray cast iron of tungsten molybdenum cobalt-silicon iron alloy carrying nano zirconium-silicon oxide and preparation method of composite modifier |
| CN107829017A (en) * | 2017-11-24 | 2018-03-23 | 禹州市恒利来合金有限责任公司 | A kind of sulphur oxygen inovulant of high intensity |
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