CN107267704A - Spheroidal graphite cast-iron and vermicular cast iron inovulant and preparation method containing nanometer silicon carbide - Google Patents
Spheroidal graphite cast-iron and vermicular cast iron inovulant and preparation method containing nanometer silicon carbide Download PDFInfo
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- CN107267704A CN107267704A CN201710531600.4A CN201710531600A CN107267704A CN 107267704 A CN107267704 A CN 107267704A CN 201710531600 A CN201710531600 A CN 201710531600A CN 107267704 A CN107267704 A CN 107267704A
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- iron
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- silicon carbide
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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
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses the spheroidal graphite cast-iron containing nanometer silicon carbide and vermicular cast iron inovulant and preparation method, it is related to inovulant technical field；The SiC powder of nano-scale dimension SiC powder and micron order yardstick is combined by the present invention using the technique of planetary ball mill, the SiC of nano particle is attached to the surface of SiC of micron particles, substantial amounts of nano silicon carbide granulate is carried using the micron order silicon-carbide particle of large-size, so as to prepare new composite Nano carbonization silicon inoculant, and the composite granule of acquisition is made using cored wire technology by core-spun yarn；Inoculation is carried out to molten ductile cast iron, vermicular cast iron molten iron using injection feeding technology, good pregnant effect is obtained；Present invention lifting spheroidal graphite cast-iron quality and vermicular cast iron technology stability, while the consumption of nano SiC is reduced, so as to reduce production cost.
Description
Technical field
The present invention relates to the spheroidal graphite cast-iron containing nanometer silicon carbide and vermicular cast iron inovulant and preparation method, belong to and breed
Agent technical field.
Background technology
Spheroidal graphite cast-iron is bred and spheroidising by adding inovulant, nodulizer into molten iron, obtains spherolith
The cast iron of ink tissue, is a kind of high-strength cast iron material, and its combination property, close to steel, is the preferable material of current " with iron for steel "
Material, is usually used in production stress complexity, and intensity, toughness, wearability etc. requires higher part.Vermicular cast iron refers to by molten iron
Middle addition inovulant, vermiculizer are bred and creepage rate, obtain the cast iron of quasiflake graphite tissue.The performance of vermicular cast iron
Between gray iron and magnesium iron, the intensity not only with approximate spheroidal graphite cast-iron, the heat conduction of approximate gray cast iron, casting character, and have
Plasticity more more preferable than gray cast iron and fatigue behaviour, are a kind of rising superior structural materials, in heavy card of new generation
There is good application prospect on the parts such as engine cylinder-body, cylinder cap and the cylinder sleeve of car.
There are some researches show nanometer silicon carbide can significantly improve the tissue of spheroidal graphite cast-iron as inovulant, reduce graphite nodule chi
It is very little, improve graphite nodule rate etc..However, the reunion of nano SiC material is not solved preferably the problem of being difficult scattered, this
One problem governs practical application of the nanometer silicon carbide in traditional casting field.Produce the control of element window of compacted iron molten iron
Very narrow, graphite compactedization is difficult, therefore strict composition and process control are needed in production process, just can guarantee that vermiculation effect
Stability.In addition, the addition of nano SiC is all than larger in early-stage Study, nano SiC price is higher, so economically simultaneously
It is undesirable.
The content of the invention
In view of the above-mentioned problems, the invention solves the problems that technological approaches be to provide spheroidal graphite cast-iron and compacted ink containing nanometer silicon carbide
Cast iron inovulant and preparation method.
The spheroidal graphite cast-iron and vermicular cast iron inovulant containing nanometer silicon carbide of the present invention, it is by nanometer silicon carbide and micron
Silicon carbide compound, substantial amounts of nano silicon carbide granulate is carried using the micron order silicon-carbide particle of large-size, nano particle
SiC is attached to the surface of SiC of micron particles, and multiple nano particles are concentrated on into tiny area during inoculation is added to
In molten iron.
The spheroidal graphite cast-iron containing nanometer silicon carbide of the present invention and the preparation method of vermicular cast iron inovulant, its preparation side
Method is as follows：
Step one：Dispensing：
The carborundum of 10 μm of average grain diameter 50nm and average grain diameter is dried 12~48 hours in drying baker, drying temperature 100
DEG C, average grain diameter 50nm is then weighed respectively and the carborundum of 10 μm of average grain diameter carries out dispensing, and nano SiC mass fraction is
0.1wt.%~50wt.%；
Step 2：Mixing：
Batch mixing is carried out using planetary ball mill, revolution rotating speed is at 200 revs/min~400 revs/min, Ball-milling Time 1~3 hour,
Ball milling terminates rear static place and cooled down 10 minutes, takes out mixed powder kept dry；
Step 3：Line processed：
Using core cabling wire machine, mixed-powder is made to a diameter of 5mm core-spun yarn.
Compared with prior art, beneficial effects of the present invention are：Lift spheroidal graphite cast-iron quality and vermicular cast iron process stabilizing
Property, while the consumption of nano SiC is reduced, so as to reduce production cost.
Brief description of the drawings：
For ease of explanation, the present invention is described in detail by following specific implementations and accompanying drawing.
Fig. 1 schemes for nanometer silicon carbide composite inoculant SEM, wherein（a）（b）For nano SiC content 1wt.% composite Nanos
SiC inovulants,（c）（d）For nano SiC content 10wt.% composite nanometer SiC inovulants,（e）（f）Nano SiC content 20wt.%
Composite nanometer SiC inovulant；
Fig. 2 is that nano SiC content 1wt.% composite nanometer SiCs breed spheroidal graphite cast-iron metallographic structure, wherein（a）Invaded for nitric acid ethanol
Metallographic structure before erosion,（b）Metallographic structure after being corroded for nitric acid ethanol；
Fig. 3 is that nano SiC content 1wt.% composite nanometer SiCs breed vermicular cast iron metallographic structure, wherein（a）For multiplication factor 50
Times metallographic,（b）For 100 times of metallographics of multiplication factor；
Fig. 4 is that nano SiC content 10wt.% composite nanometer SiCs breed spheroidal graphite cast-iron metallographic structure, wherein（a）Invaded for nitric acid ethanol
Metallographic structure before erosion,（b）Metallographic structure after being corroded for nitric acid ethanol；
Fig. 5 is that nano SiC content 10wt.% composite nanometer SiCs breed vermicular cast iron metallographic structure, wherein（a）For multiplication factor 50
Times metallographic,（b）For 100 times of metallographics of multiplication factor；
Fig. 6 is that nano SiC content 20wt.% composite nanometer SiCs breed spheroidal graphite cast-iron metallographic structure, wherein（a）Invaded for nitric acid ethanol
Metallographic structure before erosion,（b）Metallographic structure after being corroded for nitric acid ethanol；
Fig. 7 is that nano SiC content 20wt.% composite nanometer SiCs breed vermicular cast iron metallographic structure, wherein（a）For multiplication factor 50
Times metallographic,（b）For 100 times of metallographics of multiplication factor.
Embodiment：
To make the object, technical solutions and advantages of the present invention of greater clarity, below by the specific implementation shown in accompanying drawing
Example describes the present invention.However, it should be understood that these descriptions are merely illustrative, and it is not intended to limit the scope of the present invention.This
Outside, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring idea of the invention.
As shown in figure 1, present embodiment uses the technique of planetary ball mill by average grain diameter 50nmSiC powders and is averaged
10 μm of SiC powders of particle diameter are combined, and prepare composite Nano carbonization silicon inoculant, and it is a diameter of to use core cabling wire machine to be prepared into
5mm core-spun yarn.Specific features：The nano SiC granule of 10 μm of SiC particulate surface attachments in composite Nano carbonization silicon inoculant,
And as nanoparticle mass is than increasing, first increases and reach capacity afterwards.
The fusing point of carborundum itself is very high, significantly larger than the temperature of molten iron, and it is not to reach that fusing point is " molten in molten iron
Change ", and be due to caused by the difference of concentration formed by atomic migration " dissolving ".The carborundum of dissolving can be around its particle
The higher region of carbon equivalent is formed, so as to promote the precipitation of graphite, these newborn graphite nucleis effectively reduce casting
Chilling tendency, it is clear that the effect of refinement is also served to matrix.In addition, carborundum dissolving when can around it shape
Into C atomic groups, these atomic groups can form kish in crystallization process, and these kish can be as very active stone
Black crystallization nuclei, more equiax crystals are added on the basis of the heterogeneous forming core of base iron.
Be added to when by the cube carborundum particle of single Nano grade in molten iron, its mechanism of action with it is traditional
The mechanism of action of SiC inovulants is similar, but is due to that its size is minimum, and specific surface area is big, and surface can be big, so it is local micro-
The incubated nucleation ability of zonule is also very strong.We are this breeding in the very low range caused by nano silicon carbide granulate
Effect is referred to as " micro- to breed ".
Although nanometer silicon carbide have it is very strong breed ability, be due to small-sized, so single nano silicon carbide silicon grain
Son can only play incubated nucleation effect to the scope of very little around it, if being closely dispersed with a zonule in molten iron
Multiple independent nano-SiC particles, then will produce synergistic effect by their precipitations and spheroidization ability to graphite.So
And, because nano SiC particle diameter is small, surface atom ratio is big, specific surface area is big, surface lack close on coordination atom, surface can be big,
In energy unstable state so easily there is agglomeration, most of is agglomerated microparticles, the ratio of single particulate individualism
It is less.And because the density of carborundum in itself is just smaller, and the nanometer silicon carbide averag density after reuniting is smaller, so pregnant
Educate and be easy to float in processing procedure, the inoculation(effect) of nano SiC has been slackened significantly.
Composite Nano carborundum carries substantial amounts of nano silicon carbide granulate using the micron order silicon-carbide particle of large-size,
Realize and multiple nano particles are concentrated on into the imagination that tiny area is added in molten iron so that " micro- to breed " effect is folded
Plus, while as main body micron order silicon-carbide particle due to particle scale it is larger, so sphere of action is also than larger, when continuing
Between it is long, the local inoculation(effect) of large area is more readily formed in molten iron.
Embodiment：
Embodiment one：Nano SiC content 1wt.% composite inoculants breed spheroidal graphite cast-iron, vermicular cast iron：
The carborundum of 10 μm of average grain diameter 50nm and average grain diameter is dried 24 hours, then weigh respectively average grain diameter 50nm with
The carborundum that 10 μm of average grain diameter carries out dispensing, and nano SiC mass fraction is 1wt.%.Batch mixing is carried out using planetary ball mill, it is public
Speed of walking around is at 300 turns, and Ball-milling Time 2 hours, ball milling terminates rear static place and cooled down 10 minutes, takes out mixed powder kept dry.
By nano SiC content 1wt.% composite inoculants, using core cabling wire machine, mixed-powder is made to a diameter of 5mm core-spun yarn.
Obtained core-spun yarn is inserted into the molten iron after spheroidising respectively or the molten iron after creepage rate is bred, is bred
The addition of agent is 0.05wt.%.Spheroidal Graphite Cast Iron Metallographic Structure tissue is obtained after inoculation as shown in Fig. 2 spheroidal graphite cast-iron tension is strong
Spend 358MPa, elongation percentage 6%；Vermicular cast iron metallographic structure is obtained after inoculation as shown in figure 3, vermicular cast iron tensile strength
360MPa, elongation percentage 4%.
Embodiment two：Nano SiC content 10wt.% composite inoculants breed spheroidal graphite cast-iron, vermicular cast iron：
Technical scheme be the same as Example one, difference is that nano SiC mass fraction is 10wt.%.
Spheroidal Graphite Cast Iron Metallographic Structure tissue is obtained after inoculation as shown in figure 4, spheroidal graphite cast-iron tensile strength 398MPa, elongation percentage
10%；Vermicular cast iron metallographic structure is obtained after inoculation as shown in figure 5, vermicular cast iron tensile strength 379MPa, elongation percentage 6%.
Embodiment three：Nano SiC content 20wt.% composite inoculants breed spheroidal graphite cast-iron, vermicular cast iron：
Technical scheme be the same as Example one, difference is that nano SiC mass fraction is 20wt.%.
Spheroidal Graphite Cast Iron Metallographic Structure tissue is obtained after inoculation as shown in fig. 6, spheroidal graphite cast-iron tensile strength 384MPa, elongation percentage
9%；Vermicular cast iron metallographic structure is obtained after inoculation as shown in fig. 7, vermicular cast iron tensile strength 367MPa, elongation percentage 5%.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as to the claim involved by limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It may be appreciated other embodiment.
Claims (2)
1. spheroidal graphite cast-iron and vermicular cast iron inovulant containing nanometer silicon carbide, it is characterised in that：It by nanometer silicon carbide with it is micro-
Rice silicon carbide compound, substantial amounts of nano silicon carbide granulate, nano particle are carried using the micron order silicon-carbide particle of large-size
SiC be attached to the surface of SiC of micron particles, multiple nano particles are concentrated on into tiny area during inoculation adds
Into molten iron.
2. the preparation method of spheroidal graphite cast-iron and vermicular cast iron inovulant containing nanometer silicon carbide, it is characterised in that：Its preparation
Method is as follows：
Step one：Dispensing：
The carborundum of 10 μm of average grain diameter 50nm and average grain diameter is dried 12~48 hours in drying baker, drying temperature 100
DEG C, average grain diameter 50nm is then weighed respectively and the carborundum of 10 μm of average grain diameter carries out dispensing, and nano SiC mass fraction is
The wt.% of 0.1wt.%~50；
Step 2：Mixing：
Batch mixing is carried out using planetary ball mill, revolution rotating speed is at 200 revs/min~400 revs/min, Ball-milling Time 1~3 hour,
Ball milling terminates rear static place and cooled down 10 minutes, takes out mixed powder kept dry；
Step 3：Line processed：
Using core cabling wire machine, mixed-powder is made to a diameter of 5mm core-spun yarn.
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| CN201710531600.4A CN107267704B (en) | 2017-07-03 | 2017-07-03 | Inoculant containing nano silicon carbide for nodular cast iron and vermicular cast iron and preparation method thereof |
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| CN201710531600.4A CN107267704B (en) | 2017-07-03 | 2017-07-03 | Inoculant containing nano silicon carbide for nodular cast iron and vermicular cast iron and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108103260A (en) * | 2017-12-28 | 2018-06-01 | 合肥开尔纳米能源科技股份有限公司 | Core-spun yarn and preparation method thereof is bred in modification |
| CN108148940A (en) * | 2017-12-28 | 2018-06-12 | 合肥开尔纳米能源科技股份有限公司 | Modified nodularization core-spun yarn and preparation method thereof |
| CN108165696A (en) * | 2017-12-28 | 2018-06-15 | 合肥开尔纳米能源科技股份有限公司 | Modified nodulizer and preparation method thereof |
| CN108220523A (en) * | 2017-12-28 | 2018-06-29 | 合肥开尔纳米能源科技股份有限公司 | Modified inovulant and preparation method thereof |
| CN108620560A (en) * | 2018-05-11 | 2018-10-09 | 铜陵市大成轧辊有限责任公司 | A kind of processing method of additional particle strengthening grain roll wear-resisting property |
| CN110193592A (en) * | 2019-06-24 | 2019-09-03 | 界首万昌新材料技术有限公司 | A method of improving differential carrier corrosion resistance |
| CN112063791A (en) * | 2020-09-15 | 2020-12-11 | 禹州市恒利来新材料有限公司 | Nano silicon carbide and lanthanum rare earth composite inoculant and preparation method thereof |
| CN114318118A (en) * | 2021-08-30 | 2022-04-12 | 西安工业大学 | Silicon carbide reinforced synthetic vermicular graphite cast iron material and preparation method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108103260A (en) * | 2017-12-28 | 2018-06-01 | 合肥开尔纳米能源科技股份有限公司 | Core-spun yarn and preparation method thereof is bred in modification |
| CN108148940A (en) * | 2017-12-28 | 2018-06-12 | 合肥开尔纳米能源科技股份有限公司 | Modified nodularization core-spun yarn and preparation method thereof |
| CN108165696A (en) * | 2017-12-28 | 2018-06-15 | 合肥开尔纳米能源科技股份有限公司 | Modified nodulizer and preparation method thereof |
| CN108220523A (en) * | 2017-12-28 | 2018-06-29 | 合肥开尔纳米能源科技股份有限公司 | Modified inovulant and preparation method thereof |
| CN108620560A (en) * | 2018-05-11 | 2018-10-09 | 铜陵市大成轧辊有限责任公司 | A kind of processing method of additional particle strengthening grain roll wear-resisting property |
| CN108620560B (en) * | 2018-05-11 | 2020-06-05 | 铜陵市大成轧辊有限责任公司 | Processing method for strengthening wear resistance of cast iron roller by adding particles |
| CN110193592A (en) * | 2019-06-24 | 2019-09-03 | 界首万昌新材料技术有限公司 | A method of improving differential carrier corrosion resistance |
| CN112063791A (en) * | 2020-09-15 | 2020-12-11 | 禹州市恒利来新材料有限公司 | Nano silicon carbide and lanthanum rare earth composite inoculant and preparation method thereof |
| CN114318118A (en) * | 2021-08-30 | 2022-04-12 | 西安工业大学 | Silicon carbide reinforced synthetic vermicular graphite cast iron material and preparation method thereof |
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