CN112267060A - Method for improving structural performance of nodular cast iron - Google Patents
Method for improving structural performance of nodular cast iron Download PDFInfo
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- CN112267060A CN112267060A CN202011112920.4A CN202011112920A CN112267060A CN 112267060 A CN112267060 A CN 112267060A CN 202011112920 A CN202011112920 A CN 202011112920A CN 112267060 A CN112267060 A CN 112267060A
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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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/194—After-treatment
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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
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
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- 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
Abstract
The invention discloses a method for improving the structure performance of nodular cast iron; introducing graphene composite particles into nodular cast iron to obtain a finished product nodular iron casting, wherein the graphene composite particles are mixed with a solvent; the introduction is to add the graphene composite particles subjected to ball milling treatment into molten state ball-milled cast iron; the ball milling treatment is mixing and ball milling treatment of iron powder and graphene composite particles; the addition amount of the graphene composite particles in the finished nodular iron casting is 0.25-0.33 wt.%; the spheroidization rate of the nodular cast iron can be obviously improved by the graphene composite particles prepared by the method, graphite spheres are more round and more round through the improvement of the spheroidization rate, graphite distortion mainly occurs in the growth process of the nodular graphite in molten iron in the solidification process, and the probability of the distortion can be reduced through the reduction of the growth rate, so that the spheroidization rate of the nodular cast iron can be greatly increased through introducing the graphene composite particles prepared by the method, and the mechanical property of the nodular cast iron can be further improved.
Description
Technical Field
The invention belongs to the technical field of cast iron, and particularly relates to a method for improving the structure performance of ball-milling cast iron.
Background
The ductile iron is a high-strength cast iron material developed in the 20 th century and the fifties, the comprehensive performance of the ductile iron is close to that of steel, and the ductile iron is successfully used for casting parts which are complex in stress and high in requirements on strength, toughness and wear resistance based on the excellent performance of the ductile iron. Nodular cast iron has rapidly evolved to a very widely used cast iron material second only to gray cast iron. The term "steel is replaced by iron" is mainly used for nodular cast iron.
The nodular cast iron is spheroidized and inoculated to obtain spheroidal graphite, so that the mechanical properties of the cast iron are effectively improved, and particularly, the plasticity and toughness are improved, so that the strength of the cast iron is higher than that of carbon steel.
The existing as-cast nodular cast iron is always concerned with due to the relatively low production cost, but with the continuous development of economy, people have higher and higher performance requirements on the as-cast nodular cast iron, and the performance of the as-cast nodular cast iron produced by the prior art is generally improved by adding a large amount of noble metals such as copper, nickel, molybdenum and the like, so that the production cost is greatly increased.
Disclosure of Invention
The invention aims to provide a method for improving the structural performance of nodular cast iron, which aims to overcome the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a method for improving the structure performance of nodular cast iron comprises the steps of introducing graphene composite particles into the nodular cast iron to obtain a finished nodular cast iron part;
the introduction is to add the graphene composite particles subjected to ball milling treatment into molten state ball-milled cast iron;
the ball milling treatment is mixing and ball milling treatment of iron powder and graphene composite particles;
the addition amount of the graphene composite particles in the finished product nodular iron casting is 0.25-0.33 wt.%.
The preparation method of the graphene composite particles comprises the following steps:
mixing graphene, ammonia water and absolute ethyl alcohol together to obtain graphene ammonia water-ethyl alcohol solution;
mixing vinyl tri (beta-methoxyethoxy) silane, absolute ethyl alcohol and glacial acetic acid in sequence to obtain vinyl tri (beta-methoxyethoxy) silane dispersion liquid;
dropping graphene ammonia water ethanol into vinyl tri (beta-methoxyethoxy) silane dispersion liquid, stirring while dropping, standing for 10-14 hours after dropping, performing ultrasonic treatment for 5-8min, performing irradiation treatment, standing for 1.5 hours at 50-55 ℃, performing freeze drying to obtain a reactant, cleaning the reactant by using deionized water, drying in a drying box for 10 hours, calcining in a muffle furnace for 2 hours, and naturally cooling to room temperature.
The mixing ratio of the graphene to the ammonia water to the absolute ethyl alcohol is 30-40 g: 200mL of: 250 mL;
the ammonia water is saturated ammonia water.
In the vinyl tri (beta-methoxyethoxy) silane dispersion liquid, the mass fraction of the vinyl tri (beta-methoxyethoxy) silane is 9%;
the mixing volume ratio of the absolute ethyl alcohol to the glacial acetic acid is 4: 1.
The volume ratio of the graphene ammonia water ethanol solution to the vinyl tri (beta-methoxyethoxy) silane dispersion liquid is 1: 1.2-1.5.
The ultrasonic frequency is 35kHz, and the power is 500W;
the irradiation dose of the irradiation treatment is 120-130 kGy;
the freeze drying temperature is 35 ℃ below zero;
the calcining temperature in the muffle furnace is 950 ℃.
The mixing mass ratio of the iron powder to the graphene composite particles is 1.4-1.6: 1.
The ball milling treatment comprises the following steps: the ball milling time is 20 hours, the ball milling auxiliary agent is glycerol, and the ball milling rotating speed is 250 r/min.
The invention can refine ferrite grains by introducing the graphene composite particles into the nodular cast iron, and has the best effect when the addition amount is 0.25 to 0.33wt.%, because the two-dimensional mismatching degree between the graphene composite particles and the gamma-Fe introduced by the invention is higher, and the two-dimensional mismatching degree accords with the condition that the graphene composite particles become the primary phase heterogeneous nucleation core of the iron liquid, therefore, the quantity of the gamma-Fe nucleation cores is greatly improved by introducing the graphene composite particles into the nodular cast iron, the larger the quantity of the grains in a unit area is, the smaller the grain size is promoted, the effect of refining the ferrite grains is achieved, the existence of the graphene composite particles before the formation of the ferrite grain boundary can play a role of hindering the movement of the grain boundary, the dislocation movement becomes more difficult, and the increasing effect of the mechanical property is shown on the macroscopic scale, however, after the excessive amount of the graphene composite particles is introduced, but rather, the heterogeneous nucleation is weakened, because the excessive introduction of the graphene composite particles can cause partial nanoparticle agglomeration, so that the ferrite grain size is reduced, and the average size is increased.
Has the advantages that:
the spheroidization rate of the nodular cast iron can be obviously improved by the graphene composite particles prepared by the method, graphite spheres are more round and more round through the improvement of the spheroidization rate, graphite distortion mainly occurs in the growth process of the nodular graphite in molten iron in the solidification process, and the probability of the distortion can be reduced through the reduction of the growth rate, so that the spheroidization rate of the nodular cast iron can be greatly increased through introducing the graphene composite particles prepared by the method, and the mechanical property of the nodular cast iron can be further improved.
The hardness of the nodular cast iron improved by the method provided by the invention is greatly increased, because the graphite form in the metallographic structure of the nodular cast iron is greatly improved after the graphene composite particles are introduced, the ferrite grain size is obviously reduced, the interval between pearlite layers is increased, and the nodularity is increased, so that higher surface hardness is expressed.
Detailed Description
A method for improving the structure performance of nodular cast iron comprises the steps of introducing graphene composite particles into the nodular cast iron to obtain a finished nodular cast iron part;
the introduction is to add the graphene composite particles subjected to ball milling treatment into molten state ball-milled cast iron;
the ball milling treatment is mixing and ball milling treatment of iron powder and graphene composite particles;
the addition amount of the graphene composite particles in the finished product nodular iron casting is 0.25-0.33 wt.%.
The preparation method of the graphene composite particles comprises the following steps:
mixing graphene, ammonia water and absolute ethyl alcohol together to obtain graphene ammonia water-ethyl alcohol solution;
mixing vinyl tri (beta-methoxyethoxy) silane, absolute ethyl alcohol and glacial acetic acid in sequence to obtain vinyl tri (beta-methoxyethoxy) silane dispersion liquid;
dropping graphene ammonia water ethanol into vinyl tri (beta-methoxyethoxy) silane dispersion liquid, stirring while dropping, standing for 10-14 hours after dropping, performing ultrasonic treatment for 5-8min, performing irradiation treatment, standing for 1.5 hours at 50-55 ℃, performing freeze drying to obtain a reactant, cleaning the reactant by using deionized water, drying in a drying box for 10 hours, calcining in a muffle furnace for 2 hours, and naturally cooling to room temperature.
The mixing ratio of the graphene to the ammonia water to the absolute ethyl alcohol is 30-40 g: 200mL of: 250 mL;
the ammonia water is saturated ammonia water.
In the vinyl tri (beta-methoxyethoxy) silane dispersion liquid, the mass fraction of the vinyl tri (beta-methoxyethoxy) silane is 9%;
the mixing volume ratio of the absolute ethyl alcohol to the glacial acetic acid is 4: 1.
The volume ratio of the graphene ammonia water ethanol solution to the vinyl tri (beta-methoxyethoxy) silane dispersion liquid is 1: 1.2-1.5.
The ultrasonic frequency is 35kHz, and the power is 500W;
the irradiation dose of the irradiation treatment is 120-130 kGy;
the freeze drying temperature is 35 ℃ below zero;
the calcining temperature in the muffle furnace is 950 ℃.
The mixing mass ratio of the iron powder to the graphene composite particles is 1.4-1.6: 1.
The ball milling treatment comprises the following steps: the ball milling time is 20 hours, the ball milling auxiliary agent is glycerol, and the ball milling rotating speed is 250 r/min.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for improving the structure performance of nodular cast iron comprises the steps of introducing graphene composite particles into the nodular cast iron to obtain a finished nodular cast iron part; the introduction is to add the graphene composite particles subjected to ball milling treatment into molten state ball-milled cast iron; the ball milling treatment is mixing and ball milling treatment of iron powder and graphene composite particles; the addition amount of the graphene composite particles in the finished product nodular iron casting is 0.25 wt.%. The preparation method of the graphene composite particles comprises the following steps: mixing graphene, ammonia water and absolute ethyl alcohol together to obtain graphene ammonia water-ethyl alcohol solution; mixing vinyl tri (beta-methoxyethoxy) silane, absolute ethyl alcohol and glacial acetic acid in sequence to obtain vinyl tri (beta-methoxyethoxy) silane dispersion liquid; dropwise adding graphene ammonia water ethanol into vinyl tri (beta-methoxyethoxy) silane dispersion liquid, stirring while dropwise adding, standing for 10 hours after dropwise adding is completed, then carrying out ultrasonic treatment for 5min, carrying out irradiation treatment, then carrying out heat preservation and standing for 1.5 hours at 50 ℃, finally carrying out freeze drying to obtain a reactant, cleaning the reactant by using deionized water, drying for 10 hours in a drying box, then carrying out calcination treatment in a muffle furnace for 2 hours, and naturally cooling to room temperature. The mixing ratio of the graphene to the ammonia water to the absolute ethyl alcohol is 30 g: 200mL of: 250 mL; the ammonia water is saturated ammonia water. In the vinyl tri (beta-methoxyethoxy) silane dispersion liquid, the mass fraction of the vinyl tri (beta-methoxyethoxy) silane is 9%; the mixing volume ratio of the absolute ethyl alcohol to the glacial acetic acid is 4: 1. The volume ratio of the graphene ammonia water ethanol solution to the vinyl tri (beta-methoxyethoxy) silane dispersion liquid is 1: 1.2. The ultrasonic frequency is 35kHz, and the power is 500W; the irradiation dose of the irradiation treatment is 120 kGy; the freeze drying temperature is 35 ℃ below zero; the calcining temperature in the muffle furnace is 950 ℃. The mixing mass ratio of the iron powder to the graphene composite particles is 1.4: 1. The ball milling treatment comprises the following steps: the ball milling time is 20 hours, the ball milling auxiliary agent is glycerol, and the ball milling rotating speed is 250 r/min.
Example 2
A method for improving the structure performance of nodular cast iron comprises the steps of introducing graphene composite particles into the nodular cast iron to obtain a finished nodular cast iron part; the introduction is to add the graphene composite particles subjected to ball milling treatment into molten state ball-milled cast iron; the ball milling treatment is mixing and ball milling treatment of iron powder and graphene composite particles; the addition amount of the graphene composite particles in the finished nodular iron casting is 0.33 wt.%. The preparation method of the graphene composite particles comprises the following steps: mixing graphene, ammonia water and absolute ethyl alcohol together to obtain graphene ammonia water-ethyl alcohol solution; mixing vinyl tri (beta-methoxyethoxy) silane, absolute ethyl alcohol and glacial acetic acid in sequence to obtain vinyl tri (beta-methoxyethoxy) silane dispersion liquid; dropwise adding graphene ammonia water ethanol into vinyl tri (beta-methoxyethoxy) silane dispersion liquid, stirring while dropwise adding, standing for 14 hours after dropwise adding is completed, then carrying out ultrasonic treatment for 8 minutes, carrying out irradiation treatment, then carrying out heat preservation and standing for 1.5 hours at 55 ℃, finally carrying out freeze drying to obtain a reactant, cleaning the reactant by using deionized water, drying in a drying box for 10 hours, then carrying out calcination treatment in a muffle furnace for 2 hours, and naturally cooling to room temperature. The mixing ratio of the graphene to the ammonia water to the absolute ethyl alcohol is 40 g: 200mL of: 250 mL; the ammonia water is saturated ammonia water. In the vinyl tri (beta-methoxyethoxy) silane dispersion liquid, the mass fraction of the vinyl tri (beta-methoxyethoxy) silane is 9%; the mixing volume ratio of the absolute ethyl alcohol to the glacial acetic acid is 4: 1. The volume ratio of the graphene ammonia water ethanol solution to the vinyl tri (beta-methoxyethoxy) silane dispersion liquid is 1: 1.5. The ultrasonic frequency is 35kHz, and the power is 500W; the irradiation dose of the irradiation treatment is 130 kGy; the freeze drying temperature is 35 ℃ below zero; the calcining temperature in the muffle furnace is 950 ℃. The mixing mass ratio of the iron powder to the graphene composite particles is 1.6: 1. The ball milling treatment comprises the following steps: the ball milling time is 20 hours, the ball milling auxiliary agent is glycerol, and the ball milling rotating speed is 250 r/min.
Example 3
A method for improving the structure performance of nodular cast iron comprises the steps of introducing graphene composite particles into the nodular cast iron to obtain a finished nodular cast iron part; the introduction is to add the graphene composite particles subjected to ball milling treatment into molten state ball-milled cast iron; the ball milling treatment is mixing and ball milling treatment of iron powder and graphene composite particles; the addition amount of the graphene composite particles in the finished nodular iron casting is 0.28 wt.%. The preparation method of the graphene composite particles comprises the following steps: mixing graphene, ammonia water and absolute ethyl alcohol together to obtain graphene ammonia water-ethyl alcohol solution; mixing vinyl tri (beta-methoxyethoxy) silane, absolute ethyl alcohol and glacial acetic acid in sequence to obtain vinyl tri (beta-methoxyethoxy) silane dispersion liquid; dropwise adding graphene ammonia water ethanol into vinyl tri (beta-methoxyethoxy) silane dispersion liquid, stirring while dropwise adding, standing for 12 hours after dropwise adding is completed, then carrying out ultrasonic treatment for 6 minutes, carrying out irradiation treatment, then carrying out heat preservation and standing for 1.5 hours at 53 ℃, finally carrying out freeze drying to obtain a reactant, cleaning the reactant by using deionized water, drying in a drying box for 10 hours, then carrying out calcination treatment in a muffle furnace for 2 hours, and naturally cooling to room temperature. The mixing ratio of the graphene to the ammonia water to the absolute ethyl alcohol is 35 g: 200mL of: 250 mL; the ammonia water is saturated ammonia water. In the vinyl tri (beta-methoxyethoxy) silane dispersion liquid, the mass fraction of the vinyl tri (beta-methoxyethoxy) silane is 9%; the mixing volume ratio of the absolute ethyl alcohol to the glacial acetic acid is 4: 1. The volume ratio of the graphene ammonia water ethanol solution to the vinyl tri (beta-methoxyethoxy) silane dispersion liquid is 1: 1.3. The ultrasonic frequency is 35kHz, and the power is 500W; the irradiation dose of the irradiation treatment is 122 kGy; the freeze drying temperature is 35 ℃ below zero; the calcining temperature in the muffle furnace is 950 ℃. The mixing mass ratio of the iron powder to the graphene composite particles is 1.52: 1. The ball milling treatment comprises the following steps: the ball milling time is 20 hours, the ball milling auxiliary agent is glycerol, and the ball milling rotating speed is 250 r/min.
Example 4
A method for improving the structure performance of nodular cast iron comprises the steps of introducing graphene composite particles into the nodular cast iron to obtain a finished nodular cast iron part; the introduction is to add the graphene composite particles subjected to ball milling treatment into molten state ball-milled cast iron; the ball milling treatment is mixing and ball milling treatment of iron powder and graphene composite particles; the addition amount of the graphene composite particles in the finished product nodular iron casting is 0.30 wt.%. The preparation method of the graphene composite particles comprises the following steps: mixing graphene, ammonia water and absolute ethyl alcohol together to obtain graphene ammonia water-ethyl alcohol solution; mixing vinyl tri (beta-methoxyethoxy) silane, absolute ethyl alcohol and glacial acetic acid in sequence to obtain vinyl tri (beta-methoxyethoxy) silane dispersion liquid; dropwise adding graphene ammonia water ethanol into vinyl tri (beta-methoxyethoxy) silane dispersion liquid, stirring while dropwise adding, standing for 13 hours after dropwise adding is completed, then carrying out ultrasonic treatment for 7min, carrying out irradiation treatment, then carrying out heat preservation and standing for 1.5 hours at 53 ℃, finally carrying out freeze drying to obtain a reactant, cleaning the reactant by using deionized water, drying in a drying box for 10 hours, then carrying out calcination treatment in a muffle furnace for 2 hours, and naturally cooling to room temperature. The mixing ratio of the graphene to the ammonia water to the absolute ethyl alcohol is 36 g: 200mL of: 250 mL; the ammonia water is saturated ammonia water. In the vinyl tri (beta-methoxyethoxy) silane dispersion liquid, the mass fraction of the vinyl tri (beta-methoxyethoxy) silane is 9%; the mixing volume ratio of the absolute ethyl alcohol to the glacial acetic acid is 4: 1. The volume ratio of the graphene ammonia water ethanol solution to the vinyl tri (beta-methoxyethoxy) silane dispersion liquid is 1: 1.4. The ultrasonic frequency is 35kHz, and the power is 500W; the irradiation dose of the irradiation treatment is 126 kGy; the freeze drying temperature is 35 ℃ below zero; the calcining temperature in the muffle furnace is 950 ℃. The mixing mass ratio of the iron powder to the graphene composite particles is 1.5: 1. The ball milling treatment comprises the following steps: the ball milling time is 20 hours, the ball milling auxiliary agent is glycerol, and the ball milling rotating speed is 250 r/min.
Nodular cast iron samples (main chemical composition wt.%): 3.76 carbon, 2.33 silicon, 0.159 manganese, 0.025 phosphorus, 0.011 sulfur, 0.020 rhenium, 0.049 magnesium, and the balance iron;
the nodularity of the nodular cast iron is compared with that of the nodular cast iron in the comparative example;
TABLE 1
| The spheroidization rate% | |
| Example 1 | 84.38 |
| Example 2 | 84.21 |
| Example 3 | 84.79 |
| Example 4 | 85.12 |
| Comparative example 1 | 77.63 |
| Blank control group | 74.68 |
Comparative example 1: the difference from example 1 is that the graphene composite particles are replaced with untreated pure graphene;
blank control group: a base sample to which the graphene composite particles are not added;
as can be seen from table 1, the spheroidization rate of the nodular cast iron can be significantly improved by the graphene composite particles prepared by the method of the present invention, the spheroidization rate is improved, graphite nodules are more rounded, graphite distortion mainly occurs during growth of the spheroidal graphite in molten iron during solidification, and the probability of distortion can be reduced by reduction of the growth rate, so that the spheroidization rate of the nodular cast iron can be substantially increased by introducing the graphene composite particles prepared by the present invention, and the mechanical properties of the nodular cast iron can be further improved.
Continuing the test sample detection:
and (3) hardness detection (a full-automatic universal hardness tester is adopted for detection, the test adopts HV5 grade, the pressure maintaining time is 5s, 5 points are uniformly punched on the surface of the sample during the test, a certain distance is kept between every two points, the hardness value is directly read on the universal hardness tester, and the average value displayed by every point is calculated):
TABLE 2
| Hardness HV5 | |
| Example 1 | 198 |
| Example 2 | 195 |
| Example 3 | 201 |
| Example 4 | 204 |
| Comparative example 1 | 187 |
| Blank control group | 172 |
Comparative example 1: the difference from example 1 is that the graphene composite particles are replaced with untreated pure graphene;
blank control group: a base sample to which the graphene composite particles are not added;
it can be seen from table 2 that the hardness of the nodular cast iron improved by the method of the present invention is greatly increased, because the graphite morphology in the nodular cast iron metallographic structure is greatly improved after the graphene composite particles of the present invention are introduced, the ferrite grain size is significantly reduced, the pearlite layer spacing is increased, and the spheroidization rate is increased, thereby showing higher surface hardness.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.
Claims (8)
1. A method for improving the structure performance of nodular cast iron is characterized in that graphene composite particles are introduced into the nodular cast iron to obtain a finished product nodular cast iron part;
the introduction is to add the graphene composite particles subjected to ball milling treatment into molten state ball-milled cast iron;
the ball milling treatment is mixing and ball milling treatment of iron powder and graphene composite particles;
the addition amount of the graphene composite particles in the finished product nodular iron casting is 0.25-0.33 wt.%.
2. The method for improving the structural properties of nodular cast iron according to claim 1, wherein: the preparation method of the graphene composite particles comprises the following steps:
mixing graphene, ammonia water and absolute ethyl alcohol together to obtain graphene ammonia water-ethyl alcohol solution;
mixing vinyl tri (beta-methoxyethoxy) silane, absolute ethyl alcohol and glacial acetic acid in sequence to obtain vinyl tri (beta-methoxyethoxy) silane dispersion liquid;
dropping graphene ammonia water ethanol into vinyl tri (beta-methoxyethoxy) silane dispersion liquid, stirring while dropping, standing for 10-14 hours after dropping, performing ultrasonic treatment for 5-8min, performing irradiation treatment, standing for 1.5 hours at 50-55 ℃, performing freeze drying to obtain a reactant, cleaning the reactant by using deionized water, drying in a drying box for 10 hours, calcining in a muffle furnace for 2 hours, and naturally cooling to room temperature.
3. The method for improving the structural properties of nodular cast iron according to claim 2, wherein: the mixing ratio of the graphene to the ammonia water to the absolute ethyl alcohol is 30-40 g: 200mL of: 250 mL;
the ammonia water is saturated ammonia water.
4. The method for improving the structural properties of nodular cast iron according to claim 2, wherein: in the vinyl tri (beta-methoxyethoxy) silane dispersion liquid, the mass fraction of the vinyl tri (beta-methoxyethoxy) silane is 9%;
the mixing volume ratio of the absolute ethyl alcohol to the glacial acetic acid is 4: 1.
5. The method for improving the structural properties of nodular cast iron according to claim 2, wherein: the volume ratio of the graphene ammonia water ethanol solution to the vinyl tri (beta-methoxyethoxy) silane dispersion liquid is 1: 1.2-1.5.
6. The method for improving the structural properties of nodular cast iron according to claim 1, wherein: the ultrasonic frequency is 35kHz, and the power is 500W;
the irradiation dose of the irradiation treatment is 120-130 kGy;
the freeze drying temperature is 35 ℃ below zero;
the calcining temperature in the muffle furnace is 950 ℃.
7. The method for improving the structural properties of nodular cast iron according to claim 1, wherein: the mixing mass ratio of the iron powder to the graphene composite particles is 1.4-1.6: 1.
8. The method for improving the structural properties of nodular cast iron according to claim 1, wherein: the ball milling treatment comprises the following steps: the ball milling time is 20 hours, the ball milling auxiliary agent is glycerol, and the ball milling rotating speed is 250 r/min.
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| DORU M. STEFANESCU等: "Recent Developments in Understanding Nucleation", 《METALS》 * |
| 国林钊等: "球墨铸铁中两类石墨球化机理的评述", 《机械工程材料》 * |
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| CN112267060B (en) | 2021-09-28 |
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