CN113106325A - By using nano Ti2O3Method for reinforcing nodular cast iron material by ceramic particles - Google Patents

By using nano Ti2O3Method for reinforcing nodular cast iron material by ceramic particles Download PDF

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CN113106325A
CN113106325A CN202110406625.8A CN202110406625A CN113106325A CN 113106325 A CN113106325 A CN 113106325A CN 202110406625 A CN202110406625 A CN 202110406625A CN 113106325 A CN113106325 A CN 113106325A
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nano
ceramic particles
iron
nickel
nodular cast
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CN113106325B (en
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李广龙
郭现良
曲迎东
张伟
齐浩
文镇
唐才宇
李荣德
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Shenyang University of Technology
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Shenyang University of Technology
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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
    • C22C33/10—Making cast-iron alloys including procedures for adding magnesium
    • 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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/17—Metallic particles coated with metal
    • 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
    • C21C1/10—Making spheroidal graphite cast-iron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention belongs to the field of preparation of nodular cast iron materials, and relates to a method for preparing a nodular cast iron by using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles comprises the following steps: for nanometer Ti2O3Carrying out surface nickel plating on the ceramic particles; adding pig iron, scrap steel and ferrosilicon into an intermediate frequency induction furnace to smelt iron liquid; adding a nodulizer, an inoculant and perlite into a spheroidizing reaction vessel, and pouring the iron liquid obtained in the step two into spheroidizingSpheroidizing and inoculating the container; stirring the iron liquid after the ball inoculation in the three-ball reaction container, and adding the nickel-plated nano Ti prepared in the first step into the stirring process2O3Ceramic particles; adding nickel-plated nano Ti into the step four2O3Pouring the iron liquid of the ceramic particles into a casting mold, and standing for forming. The method provided by the invention is simple to operate and high in production efficiency, and the strength and plasticity of the nodular cast iron material are improved.

Description

By using nano Ti2O3Method for reinforcing nodular cast iron material by ceramic particles
Technical Field
The invention belongs to the field of preparation of nodular cast iron materials, and relates to a method for preparing a nodular cast iron by using nano Ti2O3A method for reinforcing a nodular cast iron material by ceramic particles.
Technical Field
The nodular cast iron is a special engineering material, and is rapidly and widely applied to industries such as wind power generation, automobiles and the like due to the properties of high strength, high toughness, high wear resistance and high corrosion resistance. The use amount of the nodular cast iron is increased year by year, which proves that the nodular cast iron has excellent material quality and various properties and can be used in various occasions. In many cases, ductile iron replaces other materials in its cost effective manner. At present, the mode for improving the performance of the nodular cast iron mainly has two aspects, one is to regulate and control the proportion of pearlite and ferrite through various modes, but the mode cannot give consideration to the strength and the plasticity of the nodular cast iron; the other method is a method for refining the nodular cast iron crystal grains by ceramic particles, and although the strength and the plasticity of the nodular cast iron can be simultaneously improved, the problems of floating and agglomeration of particles and the like caused by poor wettability and bonding density of the particles and the nodular cast iron exist in the adding process.
Disclosure of Invention
Object of the Invention
To prevent the above-mentioned prior art from existing Ti2O3The problems of agglomeration, floating and the like of ceramic particles in molten iron and the like, and improvement on nano Ti2O3The invention provides a method for improving the strength and plasticity of nodular cast iron material by utilizing the wettability of ceramic particles and a nodular cast iron matrix, and provides a method for improving the strength and plasticity of nodular cast iron material by utilizing nano Ti2O3A method for reinforcing a nodular cast iron material by ceramic particles,
technical scheme
By using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles comprises the following steps:
step one, nano Ti is added2O3Carrying out surface nickel plating on the ceramic particles;
adding pig iron, scrap steel and ferrosilicon into a medium-frequency induction furnace to smelt iron liquid;
adding a nodulizer, an inoculant and perlite into a nodulizing reaction container, and pouring the iron liquid obtained in the step two into the nodulizing container for nodulizing and inoculating;
step four, stirring the molten iron after the spheroidizing inoculation in the spheroidizing reaction container in the step three, and adding the nickel-plated nano Ti prepared in the step one in the stirring process2O3Ceramic particles;
step five, adding nickel-plated nano Ti into the step four2O3Pouring the iron liquid of the ceramic particles into a casting mold, and standing for forming.
Preferably, in the first step, the surface is plated with nickel nano Ti2O3The preparation method of the ceramic particles is a molten salt method; after the treatment by the molten salt method, the material is dissolved by distilled water, and then is filtered to separate plating powder. Preferably, in the step one, nano Ti is treated2O3Before the particles are plated with nickel on the surface, nano Ti should be firstly plated2O3The particles, the nickel powder and the NaCl are ball-milled and mixed in a nylon ball-milling tank of a planetary ball mill according to the proportion that the diameter of a grinding ball in the ball-milling tank is 1-5cm, and the grinding ball and the nano Ti are mixed2O3The mass ratio of the particles, the nickel powder and the NaCl mixed material is 10:1-20:1, and the rotating speed of the planetary ball mill is 20-500r/min, ball milling time of 1-12h, and then carrying out molten salt plating treatment.
Preferably, the molten salt plating treatment is to put the uniformly mixed powder into a tube furnace for heat treatment at the temperature of 800-900 ℃ for 2-5h, and argon is introduced into the tube as protective gas.
Preferably, in the second step, when the molten iron is smelted to reach 1350 ℃, the content of C and Si in the molten iron is measured, and the content of C and Si in the molten iron is controlled within the following total mass fraction range by adding one or more of a carburant, scrap steel and ferrosilicon to adjust the content of C and Si: c: 3.6-3.8%, Si: 2.1-2.5%.
Preferably, in the third step, the spheroidizing container comprises a shell, side lugs and a partition, the shell is a container with an opening at the upper part, the partition is positioned at the lower part in the shell and divides the shell into two parts, the height of the partition is lower than that of the shell, the outer walls of two sides of the shell are respectively provided with one side lug, and the side lugs are transversely provided with insertion holes in a through manner; before pouring molten iron into a spheroidizing container, adding a spheroidizing agent accounting for 1.6-2.6% of the mass of the molten iron into one side of a partition wall in a shell, covering an inoculant accounting for 0.4-1% of the mass of the molten iron on the spheroidizing container, and covering perlite with the thickness of 3-10mm on the inoculant, wherein the particle size of the perlite is 0.9-1.1 mm; and then pouring the molten iron into one side without adding the nodulizer and the inoculant, wherein after the side is filled with the molten iron, the molten iron flows into the other side in an overflow mode, and the nodulizing temperature of the molten iron is 1450-.
Preferably, a horizontally arranged baffle is arranged on one side, in which the nodulizing agent and the inoculant are added, in the shell, the baffle is fixed on one side of the partition, a supporting part is further arranged at the lower end of the baffle, the lower end of the supporting part is supported at the bottom of the inner side of the shell, an overflow hole is arranged at the position, on the upper side of the partition, an overflow recess is arranged at the position, on the upper side of the baffle, of the upper end of the partition, and the nodulizing agent and the inoculant are.
Preferably, in the fourth step, the nickel-plated nano Ti prepared in the first step is added in the stirring process2O3Ceramic particles, nickel-plated nano Ti2O3Ceramic particle massThe weight percentage of the molten iron after spheroidization and inoculation is 0.25 to 0.75 percent, the stirring speed is 1 to 500r/min, and nickel-plated nano Ti is added2O3The velocity of the ceramic particles is 1 to 500 g/s.
Preferably, the nodulizer is FeSiCaMgRE alloy, and the inoculant is FeSiCaBa alloy. Preferably, in the fifth step, the pouring temperature is 1350-; cooling to room temperature and taking out the nano Ti2O3The ceramic particles reinforce the nodular cast iron material.
Advantages and effects
The method has the advantages of simple operation and high production efficiency; for nanometer Ti2O3The surface nickel plating of the ceramic particles increases the density of the ceramic particles and can effectively prevent the nano Ti2O3Floating the ceramic particles; and improves the nano Ti2O3Wettability of the ceramic particles with the nodular cast iron matrix; nano Ti2The introduction of the O ceramic particles adopts a stirring casting method, and the ceramic particles are sucked into the molten iron by using the suction force of the molten iron vortex, so that the agglomeration problem of the ceramic particles is effectively improved, and the wettability problem of the molten iron and the ceramic particles is further improved; the strength and the plasticity of the nodular cast iron material are improved.
Drawings
FIG. 1 shows the nano Ti under microscope2O3The mass fraction of the ceramic particles is nano Ti which is 0.25 percent of the mass of the molten iron participating in spheroidization and inoculation2O3A corrosion metallographic structure picture of the ceramic particle reinforced nodular cast iron material;
FIG. 2 shows the nano Ti under microscope2O3The mass fraction of the ceramic particles is nano Ti which is 0.5 percent of the mass of the molten iron participating in spheroidization and inoculation2O3A corrosion metallographic structure picture of the ceramic particle reinforced nodular cast iron material;
FIG. 3 shows the nano Ti under microscope2O3The mass fraction of the ceramic particles is 0.75 percent of the nano Ti in the mass of the molten iron participating in spheroidization and inoculation2O3A corrosion metallographic structure picture of the ceramic particle reinforced nodular cast iron material;
FIG. 4 is a cross-sectional side view of a sphering container structure;
FIG. 5 is a cross-sectional elevation view of a sphering container structure;
FIG. 6 is a top view of a sphering container structure;
FIG. 7 is a perspective view of a sphering container structure;
FIG. 8 is a schematic view of the use of the spheroidizing vessel when charged with material;
FIG. 9 is a perspective view of a paddle;
FIG. 10 is a schematic view of the use of the stirring paddle and sphering vessel assembly;
FIG. 11 shows the addition of nickel-plated nano-Ti during stirring2O3Schematic representation of the use of ceramic particles.
Description of reference numerals: 1. the device comprises a shell, 2. side lugs, 3. partitions, 4. baffles, 5. supporting parts, 6. molten iron, 7. nodulizer, 8. inoculant, 9. perlite, 10. stirring shaft, 11. blades, 12. molten iron after nodulizing inoculation, 13. nickel-plated nano Ti2O3Ceramic particles, 14 overflow holes.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
By using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles comprises the following steps:
step one, nano Ti is added2O3Plating nickel on the surface of ceramic particles, nano Ti2O3The ceramic particles have the particle size of 100-500 nm; surface nickel plating nano Ti2O3The preparation method of the ceramic particles is a molten salt method; for nanometer Ti2O3Before the particles are plated with nickel on the surface, nano Ti should be firstly plated2O3The particles, the nickel powder and the NaCl are ball-milled and mixed in a nylon ball milling tank of a planetary ball mill according to the proportion of (8-10): (3.5-5.5): 1.8-2.2, the diameter of a grinding ball in the ball milling tank is 1-5cm (agate ball), and the grinding ball and the nano Ti are mixed2O3The mass ratio of the particles, the nickel powder and the NaCl mixed material is 10:1-20:1, the rotating speed of the planetary ball mill is 20-500r/min, the ball milling time is 1-12h, and then molten salt plating treatment is carried out; the molten salt plating treatment comprises placing the uniformly mixed powder in a tube furnace for heat treatmentThe treatment temperature is 800-900 ℃, the treatment time is 2-5h, and argon is introduced into the tube as protective gas; after the above treatment, the material was dissolved with distilled water, filtered, and the plating powder was separated.
Adding pig iron, scrap steel and ferrosilicon into a medium-frequency induction furnace to smelt iron liquid 6; when the temperature of the molten iron liquid 6 reaches 1350 ℃ in the iron smelting liquid 6, C and Si content of the iron liquid is measured by a carbon-silicon analyzer, and C and Si content in the iron liquid is controlled within the following total mass fraction range by adding one or more of carburant, scrap steel and ferrosilicon to adjust C and Si content: c: 3.6-3.8%, Si: 2.1-2.5%.
Step three, as shown in fig. 4 to 11, the spheroidizing container includes a housing 1, side ears 2 and a partition 3, the housing 1 is a container with an upper opening, the partition 3 is located at a lower portion of the housing 1 and divides the housing 1 into two parts, the height of the partition 3 is lower than that of the housing 1, two side ears 2 are respectively arranged on outer walls of two sides of the housing 1, the side ears 2 transversely penetrate through a jack for inserting a rod, the height of the rod is controlled, and then the liquid in the spheroidizing container can be poured out, the jack is preferably a pentagonal hole, the rod matched with the pentagonal hole is selected, the rod can be prevented from relatively rotating in the jack, and the rod can be grasped conveniently: a baffle plate 4 which is horizontally arranged is arranged at one side of a shell 1 which is provided with a nodulizing agent 7 and an inoculant 8, the baffle plate 4 is fixed at one side of a partition 3, the lower end of the baffle plate 4 is also provided with a supporting part 5, the upper end of the baffle plate 4 and one side far away from the partition 3 are in an upward bending shape, so that the overflowing molten iron can be buffered to a certain extent, the lower end of the supporting part 5 is supported at the bottom of the inner side of the shell 1, overflow holes 14 are arranged at the position of the partition 3 which is positioned at the upper side of the baffle plate 4, the number of the overflow holes 14 is more than or equal to 2, the partition 3 with 2 overflow holes 14 is used in the embodiment, an overflow recess is arranged at the upper end of the partition 3 and the position which is positioned at the upper side of the baffle plate 4, the nodulizing agent 7 which accounts for 1.6-2.6% of the molten iron by mass is, covering perlite 9 with the thickness of 3-10mm on the inoculant 8, wherein the particle size of the perlite 8 is 0.9-1.1 mm; the nodulizer 7 and the inoculant 8 are added below the baffle 4, the nodulizer 7 is FeSiCaMgRE alloy, and the inoculant 8 is FeSiCaBa alloy. And pouring the iron liquid 6 obtained in the second step into one side without adding the nodulizer 7 and the inoculant 8, wherein after the side is filled, the iron liquid flows into the other side in an overflow mode through the overflow holes 14 and the overflow depressions, the overflow holes 14 can allow the iron liquid to flow out in advance, the flow of the iron liquid is effectively controlled to relieve the impact of the iron liquid on the nodulizer 7 and the inoculant 8, the baffle 4 at the upper ends of the nodulizer 7 and the inoculant 8 prevents the iron liquid from directly impacting the nodulizer 7 and the inoculant 8, the nodulizer inoculant is not easy to float upwards, the iron liquid is fully subjected to nodulizing inoculation, and the nodulizing temperature of the iron liquid is 1450 and 1550 ℃.
And step four, stirring the molten iron 12 subjected to spheroidization inoculation in the spheroidization reaction container in the step three by using a stirring paddle, wherein the stirring paddle comprises a stirring shaft 10 and blades 11, the upper end of the stirring shaft 10 is connected with a rotating motor, the blades 11 are fixed on the periphery of the lower end of the stirring shaft 10, the upper part and the lower part of the blades 11 are wavy, the liquid flows stably in the rotating process, the middle part is rectangular hollow, and the resistance of the blades during rotation is effectively reduced. Adding the nickel-plated nano Ti prepared in the step one into the stirring process2O3Ceramic particles; adding the nickel-plated nano Ti prepared in the step one into the stirring process2O3 Ceramic particles 13, nickel-plated nano Ti2O3The mass fraction of the ceramic particles 13 is 0.25-0.75 percent of the mass of the molten iron after spheroidization and inoculation, the stirring speed is 1-500r/min, and nickel-plated nano Ti is added2O3The velocity of the ceramic particles 13 is 1 to 500 g/s. The stirring slurry is utilized to generate vortexes for sucking ceramic particles into the spheroidized inoculated molten iron, and the generated vortexes also enable the nickel-plated nano Ti prepared in the first step to be added2O3The ceramic particles are uniformly dispersed, and the agglomeration of the ceramic particles is effectively prevented;
step five, adding nickel-plated nano Ti into the step four2O3Pouring the molten iron of the ceramic particles 13 into the casting mold, wherein the pouring temperature is 1350-; standing, forming and cooling to room temperature, and taking out the nano Ti2O3The ceramic particles reinforce the nodular cast iron material.
Example 1
By using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles comprises the following steps:
step one, nano Ti is added2O3Plating nickel on the surface of ceramic particles, nano Ti2O3The ceramic particles used were particles having a particle size of 100 nm; surface nickel plating nano Ti2O3The preparation method of the ceramic particles is a molten salt method; for nanometer Ti2O3Before the particles are plated with nickel on the surface, nano Ti should be firstly plated2O3The particles, the nickel powder and the NaCl are ball-milled and mixed in a nylon ball-milling tank of a planetary ball mill according to the proportion of 8:3.5:1.8, the diameter of a grinding ball in the ball-milling tank is 1cm (agate ball), and the grinding ball and the nano Ti are mixed2O3The mass ratio of the particles to the mixed material of nickel powder and NaCl is 10:1, the rotating speed of the planetary ball mill is 20r/min, the ball milling time is 1h, and then molten salt plating treatment is carried out; the fused salt plating treatment is to put the uniformly mixed powder into a tube furnace for heat treatment at 800 ℃ for 5 hours, and argon is introduced into the tube as protective gas; after the above treatment, the material was dissolved with distilled water, filtered, and the plating powder was separated.
Adding pig iron, scrap steel and ferrosilicon into a medium-frequency induction furnace to smelt iron liquid 6; when the melted iron liquid 6 reaches 1350 ℃ by the melted iron liquid 6, C and Si content determination is carried out on the iron liquid by a carbon-silicon analyzer, and C and Si content in the iron liquid is controlled by adding one or more of carburant, scrap steel and ferrosilicon to adjust C and Si content: c: 3.6%, Si: 2.1 percent.
Adding a nodulizer 7 accounting for 1.6 percent of the mass of the molten iron 6 into one side of the partition wall 3 in the shell 1 of the nodulizing container, covering the nodulizer 8 accounting for 0.4 to 1 percent of the mass of the molten iron 6 on the nodulizer, covering perlite 9 with the thickness of 3mm on the inoculant 8, wherein the particle size of the perlite 8 is 0.9 mm; the nodulizer 7 and the inoculant 8 are added below the baffle 4, the nodulizer 7 is FeSiCaMgRE alloy, and the inoculant 8 is FeSiCaBa alloy. And pouring the molten iron 6 in the second step into one side without adding the nodulizer 7 and the inoculant 8, wherein after the side is full, the molten iron flows into the other side in an overflow mode, and the nodulizing temperature of the molten iron is 1450 ℃.
Step four, stirring the molten iron 12 subjected to the ball inoculation in the reaction vessel in the step three by using a stirring slurry, and adding the nickel-plated nano Ti prepared in the step one in the stirring process2O3Ceramic particles; adding the nickel-plated nano Ti prepared in the step one into the stirring process2O3 Ceramic particles 13, nickel-plated nano Ti2O3The mass fraction of the ceramic particles 13 is 0.25 percent of the mass of the molten iron after spheroidization and inoculation, the stirring speed is 1r/min, and nickel-plated nano Ti is added2O3The velocity of the ceramic particles 13 is 1 g/s.
Step five, adding nickel-plated nano Ti into the step four2O3Pouring the iron liquid of the ceramic particles 13 into the casting mold, wherein the pouring temperature is 1350 ℃; standing, forming and cooling to room temperature, and taking out the nano Ti2O3The ceramic particles reinforce the nodular cast iron material.
As shown in fig. 1, the black spherical structure is graphite nodules, the black elongated structure is pearlite, and the remaining gray portion is ferrite. From the figure, it can be observed that the graphite nodules are round and evenly distributed, the ferrite grains are even in size, and the pearlite content is high. Nickel plated layer nano Ti2O3The ceramic particles are distributed at various locations in the tissue. The tensile strength of the ductile iron material can reach 400 MPa.
Example 2
By using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles comprises the following steps:
step one, nano Ti is added2O3Plating nickel on the surface of ceramic particles, nano Ti2O3The ceramic particles used were particles having a particle size of 300 nm; surface nickel plating nano Ti2O3The preparation method of the ceramic particles is a molten salt method; for nanometer Ti2O3Before the particles are plated with nickel on the surface, nano Ti should be firstly plated2O3The particles, the nickel powder and the NaCl are subjected to ball milling and powder mixing in a nylon ball milling tank of a planetary ball mill according to the proportion of 9:4.5:2, and the diameter of a milling ball in the ball milling tank is 3cm (agate)Ball), grinding ball and nano Ti2O3The mass ratio of the particles to the mixed material of nickel powder to NaCl is 15:1, the rotating speed of the planetary ball mill is 250r/min, the ball milling time is 7h, and then molten salt plating treatment is carried out; the fused salt plating treatment is to put the uniformly mixed powder into a tube furnace for heat treatment at 850 ℃ for 3.5h, and argon is introduced into the tube as protective gas; after the above treatment, the material was dissolved with distilled water, filtered, and the plating powder was separated.
Adding pig iron, scrap steel and ferrosilicon into a medium-frequency induction furnace to smelt iron liquid 6; when the melted iron liquid 6 reaches 1350 ℃ by the melted iron liquid 6, C and Si content determination is carried out on the iron liquid by a carbon-silicon analyzer, and C and Si content in the iron liquid is controlled by adding one or more of carburant, scrap steel and ferrosilicon to adjust C and Si content: c: 3.7%, Si: 2.3 percent.
Adding a nodulizer 7 accounting for 2.0 percent of the mass of the molten iron 6 into one side of the partition wall 3 in the shell 1 of the nodulizing container, covering the nodulizer 8 accounting for 0.4 to 1 percent of the mass of the molten iron 6 on the nodulizer, covering perlite 9 with the thickness of 7mm on the inoculant 8, wherein the particle size of the perlite 8 is 1 mm; the nodulizer 7 and the inoculant 8 are added below the baffle 4, the nodulizer 7 is FeSiCaMgRE alloy, and the inoculant 8 is FeSiCaBa alloy. And pouring the molten iron 6 in the second step into one side without adding the nodulizer 7 and the inoculant 8, wherein after the side is filled with the molten iron, the molten iron flows into the other side in an overflow mode, and the nodulizing temperature of the molten iron is 1500 ℃.
Step four, stirring the molten iron 12 subjected to the ball inoculation in the reaction vessel in the step three by using a stirring slurry, and adding the nickel-plated nano Ti prepared in the step one in the stirring process2O3Ceramic particles; adding the nickel-plated nano Ti prepared in the step one into the stirring process2O3 Ceramic particles 13, nickel-plated nano Ti2O3The mass fraction of the ceramic particles 13 is 0.5 percent of the mass of the molten iron after spheroidization and inoculation, the stirring speed is 250r/min, and nickel-plated nano Ti is added2O3The velocity of the ceramic particles 13 is 250 g/s.
Step five, adding the step four into the platingNickel nano Ti2O3Pouring the molten iron of the ceramic particles 13 into the casting mold, wherein the pouring temperature is 1400 ℃; standing, forming and cooling to room temperature, and taking out the nano Ti2O3The ceramic particles reinforce the nodular cast iron material.
As shown in fig. 2, the black spherical structure is graphite nodules, the black elongated structure is pearlite, and the remaining gray portion is ferrite. From the figure, it can be observed that the graphite nodules are round and evenly distributed, the ferrite grains are even in size, and the pearlite content is high. Nickel plated layer nano Ti2O3The ceramic particles are distributed at various locations in the tissue. The tensile strength of the ductile iron material can reach 420 MPa.
Example 3
By using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles comprises the following steps:
step one, nano Ti is added2O3Plating nickel on the surface of ceramic particles, nano Ti2O3The ceramic particles used were particles having a particle size of 500 nm; surface nickel plating nano Ti2O3The preparation method of the ceramic particles is a molten salt method; for nanometer Ti2O3Before the particles are plated with nickel on the surface, nano Ti should be firstly plated2O3The particles, the nickel powder and the NaCl are ball-milled and mixed in a nylon ball-milling tank of a planetary ball mill according to the proportion of 10:5.5:2.2, the diameter of a grinding ball in the ball-milling tank is 5cm (agate ball), and the grinding ball and the nano Ti are mixed2O3The mass ratio of the particles to the mixed material of nickel powder and NaCl is 20:1, the rotating speed of the planetary ball mill is 500r/min, the ball milling time is 12h, and then molten salt plating treatment is carried out; the fused salt plating treatment is to put the uniformly mixed powder into a tube furnace for heat treatment at 900 ℃ for 2 hours, and argon is introduced into the tube as protective gas; after the above treatment, the material was dissolved with distilled water, filtered, and the plating powder was separated.
Adding pig iron, scrap steel and ferrosilicon into a medium-frequency induction furnace to smelt iron liquid 6; when the melted iron liquid 6 reaches 1350 ℃ by the melted iron liquid 6, C and Si content determination is carried out on the iron liquid by a carbon-silicon analyzer, and C and Si content in the iron liquid is controlled by adding one or more of carburant, scrap steel and ferrosilicon to adjust C and Si content: c: 3.8%, Si: 2.5 percent.
Adding a nodulizer 7 accounting for 2.6 percent of the mass of the molten iron 6 into one side of the partition wall 3 in the shell 1 of the nodulizing container, covering the nodulizer 8 accounting for 0.4 to 1 percent of the mass of the molten iron 6 on the nodulizer, covering perlite 9 with the thickness of 10mm on the inoculant 8, wherein the particle size of the perlite 8 is 1.1 mm; the nodulizer 7 and the inoculant 8 are added below the baffle 4, the nodulizer 7 is FeSiCaMgRE alloy, and the inoculant 8 is FeSiCaBa alloy. And pouring the molten iron 6 in the second step into one side without adding the nodulizer 7 and the inoculant 8, wherein after the side is filled with the molten iron, the molten iron flows into the other side in an overflowing mode, and the nodulizing temperature of the molten iron is 1550 ℃.
Step four, stirring the molten iron 12 subjected to the ball inoculation in the reaction vessel in the step three by using a stirring slurry, and adding the nickel-plated nano Ti prepared in the step one in the stirring process2O3Ceramic particles; adding the nickel-plated nano Ti prepared in the step one into the stirring process2O3 Ceramic particles 13, nickel-plated nano Ti2O3The mass fraction of the ceramic particles 13 is 0.75 percent of the mass of the molten iron after spheroidization and inoculation, the stirring speed is 500r/min, and nickel-plated nano Ti is added2O3The velocity of the ceramic particles 13 was 500 g/s.
Step five, adding nickel-plated nano Ti into the step four2O3Pouring the molten iron of the ceramic particles 13 into the casting mold, wherein the pouring temperature is 1450 ℃; standing, forming and cooling to room temperature, and taking out the nano Ti2O3The ceramic particles reinforce the nodular cast iron material.
As shown in fig. 3, the black spherical structure is graphite nodules, the black elongated structure is pearlite, and the remaining gray portion is ferrite. From the figure, it can be observed that the graphite nodules are round and evenly distributed, the ferrite grains are even in size, and the pearlite content is high. Nickel plated layer nano Ti2O3The ceramic particles are distributed at various locations in the tissue. The tensile strength of the ductile iron material can reach 470 MPa.

Claims (10)

1. By using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles is characterized by comprising the following steps: the method comprises the following steps:
step one, nano Ti is added2O3Carrying out surface nickel plating on the ceramic particles;
adding pig iron, scrap steel and ferrosilicon into a medium-frequency induction furnace to smelt iron liquid;
adding a nodulizer, an inoculant and perlite into a nodulizing reaction container, and pouring the iron liquid obtained in the step two into the nodulizing container for nodulizing and inoculating;
step four, stirring the molten iron after the spheroidizing inoculation in the spheroidizing reaction container in the step three, and adding the nickel-plated nano Ti prepared in the step one in the stirring process2O3Ceramic particles;
step five, adding nickel-plated nano Ti into the step four2O3Pouring the iron liquid of the ceramic particles into a casting mold, and standing for forming.
2. The method of claim 1 using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles is characterized by comprising the following steps: in the first step, the surface is plated with nickel nano Ti2O3The preparation method of the ceramic particles is a molten salt method; after the treatment by the molten salt method, the material is dissolved by distilled water, and then is filtered to separate plating powder.
3. The use of nano Ti according to claim 1 or 22O3The method for reinforcing the nodular cast iron material by the ceramic particles is characterized by comprising the following steps: in the step one, nano Ti is added2O3Before the particles are plated with nickel on the surface, nano Ti should be firstly plated2O3The particles, the nickel powder and the NaCl are ball-milled and mixed in a nylon ball-milling tank of a planetary ball mill according to the proportion of (8-10): (3.5-5.5): 1.8-2.2, the diameter of a grinding ball in the ball-milling tank is 1-5cm, and the grinding ball and the nano Ti are mixed2O3The mass ratio of the particles, the nickel powder and the NaCl mixed material is 10:1-20:1, and the rotating speed of the planetary ball mill is 20-500r/min, ball milling time of 1-12h, and then carrying out molten salt plating treatment.
4. The method of claim 3 using nano-Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles is characterized by comprising the following steps: the fused salt plating treatment is to put the uniformly mixed powder into a tube furnace for heat treatment at the temperature of 800-900 ℃ for 2-5h, and argon is introduced into the tube as protective gas.
5. The method of claim 1 using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles is characterized by comprising the following steps: in the second step, when the molten iron temperature reaches 1350 ℃ in the iron smelting process, the content of C and Si in the iron liquid is measured, and is regulated by adding one or more of carburant, scrap steel and ferrosilicon, so that the content of C and Si in the iron liquid is controlled in the following total mass fraction range: c: 3.6-3.8%, Si: 2.1-2.5%.
6. The method of claim 1 using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles is characterized by comprising the following steps: in the third step, the spheroidizing container comprises a shell, side lugs and a partition, wherein the shell is a container with an opening at the upper part, the partition is positioned at the lower part in the shell and divides the shell into two parts, the height of the partition is lower than that of the shell, the outer walls at two sides of the shell are respectively provided with one side lug, and the side lugs are transversely provided with insertion holes in a through manner; before pouring molten iron into a spheroidizing container, adding a spheroidizing agent accounting for 1.6-2.6% of the mass of the molten iron into one side of a partition wall in a shell, covering an inoculant accounting for 0.4-1% of the mass of the molten iron on the spheroidizing container, and covering perlite with the thickness of 3-10mm on the inoculant, wherein the particle size of the perlite is 0.9-1.1 mm; and then pouring the molten iron into one side without adding the nodulizer and the inoculant, wherein after the side is filled with the molten iron, the molten iron flows into the other side in an overflow mode, and the nodulizing temperature of the molten iron is 1450-.
7. The method of claim 6 using nano-Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles is characterized by comprising the following steps: the novel multifunctional liquid crystal display panel is characterized in that a horizontally arranged baffle is arranged on one side, which is provided with a nodulizing agent and an inoculant, in the shell, the baffle is fixed on one side of the partition, a supporting part is further arranged at the lower end of the baffle, the lower end of the supporting part is supported at the bottom of the inner side of the shell, an overflow hole is formed in the position, which is located on the upper side of the baffle, of the partition, an overflow recess is formed in the position, which is located on the upper side of the baffle.
8. The method of claim 1 using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles is characterized by comprising the following steps: in the fourth step, the nickel-plated nano Ti prepared in the first step is added in the stirring process2O3Ceramic particles, nickel-plated nano Ti2O3The mass fraction of the ceramic particles is 0.25-0.75 percent of the mass of the iron liquid after spheroidization and inoculation, the stirring speed is 1-500r/min, and nickel-plated nano Ti is added2O3The velocity of the ceramic particles is 1 to 500 g/s.
9. The method of claim 1 using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles is characterized by comprising the following steps: the nodulizer is FeSiCaMgRE alloy, and the inoculant is FeSiCaBa alloy.
10. The method of claim 1 using nano Ti2O3The method for reinforcing the nodular cast iron material by the ceramic particles is characterized by comprising the following steps: in the fifth step, the pouring temperature is 1350-; cooling to room temperature and taking out the nano Ti2O3The ceramic particles reinforce the nodular cast iron material.
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