CN105132788B - Preparation method of gray/vermicular graphite composite cast iron material - Google Patents
Preparation method of gray/vermicular graphite composite cast iron material Download PDFInfo
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- CN105132788B CN105132788B CN201510573770.XA CN201510573770A CN105132788B CN 105132788 B CN105132788 B CN 105132788B CN 201510573770 A CN201510573770 A CN 201510573770A CN 105132788 B CN105132788 B CN 105132788B
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Abstract
The invention discloses a preparation method of a gray/vermicular graphite composite cast iron material. The preparation method comprises the steps of coating a FeS-containing paint with the thickness of 0.2-2mm on the surface of a local casting mould of a casting; after naturally drying for 8-12 hours, pouring vermicular graphite cast iron at the temperature of 1350-1400 DEG C; after cooling and solidifying, preparing a gray cast iron layer with the thickness of 1-5mm on the surface of the casting and vermicular graphite cast iron on other parts to obtain the gray/vermicular graphite composite cast iron material. The aims of reducing the working temperature of a firepower surface of a cylinder cover, reducing the thermal stress of the cylinder cover and prolonging the service life of the cylinder cover are achieved by virtue of the characteristics of favorable heat conductivity of the gray cast iron and relatively high toughness and fatigue resistance of the vermicular graphite cast iron.
Description
Technical field
The invention belongs to metal material field, and in particular to a kind of preparation method of ash/compacted compounded cast iron material.
Background technology
With the continuous lifting of diesel engine performance, thermic load and machine that burning chamber of diesel engine critical component such as cylinder cap is born
Tool load more and more higher, to cylinder of diesel engine cover material and manufacturing technology it is also proposed that requirement higher.Constitute the firepower of combustion chamber
Face temperature is high, it is desirable to which the material of fire power face has good heat conductivility；Other positions require to have enough obdurabilities and resist
Fatigability.The cylinder cap of advanced high-speed boosting diesel engine is cast using cast-iron alloy mostly.
However, traditional cylinder head cylinder iron the toughness and tenacity of material is conflicting with thermal conductivity, shifting phenomenon is serious.
The heat conductivility of gray cast iron is excellent, but obdurability is good and fatigue resistance is poor；And vermicular cast iron obdurability, fatigue resistance are moderate, but
Heat conductivility is not enough.Due to being difficult to take into account these performances simultaneously, domestic and international high power diesel engine cast-iron head is caused often to be sent out
Life damages the serious problems of diesel engine due to fire power face thermal stress-cracking.
How high performance diesel cylinder head is made while having excellent obdurability, fatigue resistance and thermal conductivity, preparation ash/
Compacted compounded cast iron material cylinder head is a kind of most effective and feasible method.
The content of the invention
In view of this, it is a primary object of the present invention to provide a kind of preparation method of ash/compacted compounded cast iron material.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
The embodiment of the present invention provides a kind of preparation method of ash/compacted compounded cast iron material, and the method is：Locally cast in casting
Coating of the type surface smear 0.2-2mm containing FeS, spontaneously dries 8-12 hours；Compacted ink casting is poured into a mould under conditions of 1350-1400 DEG C
Iron, prepares cast(ing) surface 1-5mm gray cast iron after cooled and solidified, other positions are the ash/compacted compounded cast iron material of vermicular cast iron.
In such scheme, the composition of the coating is FeS：5-30wt%, phenolic resin：1-5wt%, balance of bentonite hangs
Supernatant liquid.
In such scheme, the FeS is commercially available technical grade ferrous sulfide, granularity of the ball milling into 80-120 mesh；The swelling
Native suspension is that sodium bentonite and water press 1：1 configuration, places after stirring fully and is made for 8-15 hours.
In such scheme, the preparation method of the coating adds FeS first to stir bentonite suspension 3-5 minutes
It is made after being stirred uniformly with phenolic resin.
Compared with prior art, beneficial effects of the present invention：
The present invention prepares ash/compacted compounded cast iron material and can simultaneously improve the local heat conductivility of Cast Iron Surface, while also
Casting body can be made has obdurability and fatigue resistance high.Before having a wide range of applications on the cylinder cover for diesel engine and body
Scape.Ash/compacted compounded cast iron the cylinder head prepared using the method for the present invention takes into account tough, high heat conduction high and high fatigue resistance,
The Service Environment of cylinder head can be substantially improved and service life is improved, current high power density diesel engine cylinder head is thoroughly solved
Cause ablation and thermal stress-cracking because temperature is too high and damage diesel engine problem.Also, pass through surface treatment method with tradition
（Surface spraying, laser remolten or surface induction hardening）And improve that cylinder head is locally heat-resisting to be compared with oxidation resistance, cost
Lower, environmental pollution is small, reliability is higher.
Brief description of the drawings
Fig. 1 is the ash/compacted compounded cast iron of embodiment 1 by surface to internal microscopic structure；
Fig. 2 is the ash/compacted compounded cast iron material of embodiment 2 by surface to internal microstructure；
Fig. 3 is the compounded cast iron material of embodiment 3 by surface to internal microscopic structure.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
In theory, when being reacted during iron liquid compactedization, the addition of sulphur can occur instead with the main compactedization element magnesium in vermicular cast iron
Should, generate MgS or MgSO3Deng the sulfide of magnesium, the remaining content of magnesium in iron liquid can be reduced, not reach vermicular cast iron critical compacted
, there is vermiculation phenomenon in the residual magnesium content of change, form gray cast iron.
The present invention is theoretical based on this, and smearing can result in vermicular cast iron compactedization and decline on the sand mold of cylinder head fire power face top layer
The coating of the sulfur-bearing for moving back, makes the vermicular cast iron top layer certain thickness of cast that vermiculation to occur, generation layer flake graphite, so as to
Fire power face prepares one layer of gray cast iron, and other positions are the new method of vermicular cast iron.So as to significantly improve the heat conduction of cylinder cap fire power face
Ability, 45 ~ 58W/m.k of gray cast iron is brought up to from 30 ~ 42W/m.k of vermicular cast iron, improves 38%.For high power diesel oil
For machine cylinder cap applying working condition, 30 ~ 50 DEG C of the temperature reduction of cylinder cap fire power face can be made, significantly improve the working environment of cylinder cap
With raising service life.
The present invention is that one kind prepares cast(ing) surface for gray cast iron by changing coating composition, and casting body is vermicular cast iron
Novel processing step.
The embodiment of the present invention provides a kind of preparation method of ash/compacted compounded cast iron material, and the method is：Locally cast in casting
Coating of the type surface smear 0.2-2mm containing FeS, spontaneously dries 8-12 hours；Compacted ink casting is poured into a mould under conditions of 1350-1400 DEG C
Iron, prepares cast(ing) surface 1-5mm gray cast iron after cooled and solidified, other positions are the ash/compacted compounded cast iron material of vermicular cast iron.
The composition of all coating is FeS：5-30wt%, phenolic resin：1-5wt%, balance of bentonite suspension.
The FeS is commercially available technical grade ferrous sulfide, granularity of the ball milling into 80-120 mesh；The bentonite suspension is sodium
Base bentonite and water press 1：1 configuration, places 8-15 hours after stirring fully.
The preparation method of the coating adds FeS and phenolic resin enters first to stir bentonite suspension 3-5 minutes
Row is made after stirring.
The vermicular cast iron composition and preparation method are common vermicular cast iron and its method of smelting in GB.
Embodiment 1：
The composition of all coating is commercially available technical grade FeS：5wt%, phenolic resin：1wt%, balance of bentonite suspension.
Bentonite and water are first pressed 1：1 mixing, places after stirring fully and is made within 8 hours bentonite suspension, and FeS grinds to form 80 mesh.Connect
Bentonite suspension is first stirred into 3min when configuration coating, adds FeS, phenolic resin standby after continuing to stir.Then
Coating of the 0.2mm containing FeS is smeared in casting part mo(U)ld face, is spontaneously dried 8 hours.Vermicular cast iron is poured into a mould at 1350 DEG C
（RuT300）, cast(ing) surface 1.4mm gray cast iron is prepared after cooled and solidified, other positions are the ash/compacted compounded cast iron of vermicular cast iron
Material（See Fig. 1）.As can be seen from Figure 1：Ash prepared by the present invention/compacted compounded cast iron material gray cast iron layer and vermicular cast iron layer combine good
Good, transition zone tissue is well mixed, and does not have obvious casting flaw, and surface gray cast iron thickness degree reaches 1.4mm.
Embodiment 2：
The composition of all coating is commercially available technical grade FeS：15wt%, phenolic resin：3wt%, balance of bentonite suspension.
Bentonite and water are first pressed 1：1 mixing, places after stirring fully and is made within 10 hours bentonite suspension, and FeS grinds to form 100 mesh.
Bentonite suspension is first stirred into 4min when then configuring coating, adds FeS, phenolic resin standby after continuing to stir.Connect
And smear coating of the 0.5mm containing FeS in casting part mo(U)ld face, spontaneously dry 10 hours.Vermicular cast iron is poured into a mould at 1380 DEG C
（RuT300）, cast(ing) surface 5mm gray cast iron is prepared after cooled and solidified, other positions are the ash/compacted composite casting iron material of vermicular cast iron
Material（See Fig. 2）.As can be seen from Figure 2：Ash prepared by the present invention/compacted compounded cast iron material gray cast iron layer and vermicular cast iron layer combine good
Good, transition zone tissue is well mixed, and does not have obvious casting flaw, and surface gray cast iron thickness degree reaches 5mm.
Embodiment 3：
The composition of all coating is commercially available technical grade FeS：30wt%, phenolic resin：5wt%, balance of bentonite suspension.
Bentonite and water are first pressed 1：1 mixing, places after stirring fully and is made within 15 hours bentonite suspension, and FeS grinds to form 120 mesh.
Bentonite suspension is first stirred into 5min when then configuring coating, adds FeS, phenolic resin standby after continuing to stir.Connect
And smear coating of 2 mm containing FeS in casting part mo(U)ld face, spontaneously dry 12 hours.Vermicular cast iron is poured into a mould at 1400 DEG C
（RuT300）, cast(ing) surface 3mm gray cast iron is prepared after cooled and solidified, other positions are the ash/compacted composite casting iron material of vermicular cast iron
Material（See Fig. 3）.As can be seen from Figure 3：Ash prepared by the present invention/compacted compounded cast iron material gray cast iron layer and vermicular cast iron layer combine good
Good, transition zone tissue is well mixed, and does not have obvious casting flaw, and surface gray cast iron thickness degree reaches 3mm.
The above, only presently preferred embodiments of the present invention is not intended to limit the scope of the present invention.
Claims (1)
1. a kind of preparation method of ash/compacted compounded cast iron material, it is characterised in that the method is：In casting part mo(U)ld face
Coating of the 0.2-2mm containing FeS is smeared, is spontaneously dried 8-12 hours；Vermicular cast iron is poured into a mould under conditions of 1350-1400 DEG C, it is cold
But cast(ing) surface 1-5mm gray cast iron is prepared after solidifying, other positions are the ash/compacted compounded cast iron material of vermicular cast iron；
The composition of the coating is FeS：5-30wt%, phenolic resin：1-5wt%, balance of bentonite suspension；
The FeS is commercially available technical grade ferrous sulfide, granularity of the ball milling into 80-120 mesh；The bentonite suspension is that sodium base is swollen
Profit soil and water press 1：1 configuration, places after stirring fully and is made for 8-15 hours；
The preparation method of the coating adds FeS and phenolic resin is stirred first to stir bentonite suspension 3-5 minutes
It is made after mixing uniformly.
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| CN201510573770.XA CN105132788B (en) | 2015-09-10 | 2015-09-10 | Preparation method of gray/vermicular graphite composite cast iron material |
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| CN201510573770.XA CN105132788B (en) | 2015-09-10 | 2015-09-10 | Preparation method of gray/vermicular graphite composite cast iron material |
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| CN105132788A CN105132788A (en) | 2015-12-09 |
| CN105132788B true CN105132788B (en) | 2017-05-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020111948A1 (en) * | 2018-11-29 | 2020-06-04 | Elkem Asa | Mould powder and mould coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381838A (en) * | 2008-10-17 | 2009-03-11 | 河南省中原内配股份有限公司 | Vermicular cast iron cylinder liner and preparation method thereof |
| CN101602088A (en) * | 2009-07-13 | 2009-12-16 | 西安建筑科技大学 | A kind of preparation method of iron casting coating by flyash |
| CN102489665A (en) * | 2011-12-27 | 2012-06-13 | 本溪新兴盛铸造有限公司 | Casting surface coating |
| CN104439219A (en) * | 2014-10-27 | 2015-03-25 | 大丰市洪联铸钢有限责任公司 | Steel ring billet casting technique based on casting and rolling combined forming |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS609573A (en) * | 1983-06-28 | 1985-01-18 | Hitachi Metals Ltd | Sliding member having monolithic construction and its production |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381838A (en) * | 2008-10-17 | 2009-03-11 | 河南省中原内配股份有限公司 | Vermicular cast iron cylinder liner and preparation method thereof |
| CN101602088A (en) * | 2009-07-13 | 2009-12-16 | 西安建筑科技大学 | A kind of preparation method of iron casting coating by flyash |
| CN102489665A (en) * | 2011-12-27 | 2012-06-13 | 本溪新兴盛铸造有限公司 | Casting surface coating |
| CN104439219A (en) * | 2014-10-27 | 2015-03-25 | 大丰市洪联铸钢有限责任公司 | Steel ring billet casting technique based on casting and rolling combined forming |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020111948A1 (en) * | 2018-11-29 | 2020-06-04 | Elkem Asa | Mould powder and mould coating |
| FR3089138A1 (en) * | 2018-11-29 | 2020-06-05 | Elkem Asa | Mold powder and mold coating |
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| CN105132788A (en) | 2015-12-09 |
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Effective date of registration: 20220601 Address after: 710038 No. 1, row 1, Yutong Industrial Park, No. 1, Fangyi Road, Baqiao District, Xi'an City, Shaanxi Province Patentee after: Shaanxi Pengyun machinery automation technology Co.,Ltd. Address before: 710032 No. 2 Xuefu Middle Road, Weiyang District, Xi'an City, Shaanxi Province Patentee before: XI'AN TECHNOLOGICAL University |
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Effective date of registration: 20221111 Address after: 710199 plant 2, No. 29, Shanglinyuan Third Road, high tech Zone, Xi'an, Shaanxi Province Patentee after: Xi'an Kangbo New Material Technology Co.,Ltd. Address before: 710038 No. 1, row 1, Yutong Industrial Park, No. 1, Fangyi Road, Baqiao District, Xi'an City, Shaanxi Province Patentee before: Shaanxi Pengyun machinery automation technology Co.,Ltd. |
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