CN107675036A - A kind of automobile engine case - Google Patents
A kind of automobile engine case Download PDFInfo
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- CN107675036A CN107675036A CN201710771531.4A CN201710771531A CN107675036A CN 107675036 A CN107675036 A CN 107675036A CN 201710771531 A CN201710771531 A CN 201710771531A CN 107675036 A CN107675036 A CN 107675036A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
- C22C21/04—Modified aluminium-silicon alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1005—Pretreatment of the non-metallic additives
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0084—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ carbon or graphite as the main non-metallic constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0085—Materials for constructing engines or their parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0095—Constructing engine casings
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
The present invention relates to a kind of case, and in particular to a kind of automobile engine case, belongs to mechanical material field.Automobile engine case of the present invention is made of aluminum alloy materials, and the aluminum alloy materials are made up of the composition of following mass percent：Mg：1.2 1.8%, Si：1.8 2.5%, Cu：0.2 0.5%, Mn：0.2 0.3%, Zr：0.25 0.35%, Er：0.1 0.2%, Sheet Graphite：2 3%, surplus is Al and inevitable impurity element.Automobile engine case of the present invention is made of aluminum alloy materials, and the component and mass percent of reasonable compatibility aluminium alloy, while rare earth alterative Pr is added in preparation process2(CO3)3, being heat-treated includes solution treatment, one-level Ageing Treatment and secondary time effect processing, also prepares micro-arc oxidation films using specific composition, the aluminum alloy materials enabled to have decay resistance.
Description
Invention field
The present invention relates to a kind of case, and in particular to a kind of automobile engine case, belongs to mechanical material field.
Background technology
Engine is the heart of automobile, and power is provided for the walking of automobile, is related to the dynamic property, economy, ring of automobile
Guarantor property.In simple terms, engine is exactly an energy transfer mechanism, i.e., by gasoline (diesel oil) or the heat energy of natural gas, by
Combustor inner cylinder gas expansion is sealed, piston work done is promoted, is changed into mechanical energy, this is the most basic principle of engine.Start
All structures of machine are all the history passed by for energy conversion service, engine along with automobile more than 100 years, are either existed
Design, manufacture, technique still all improved a lot in performance, control aspect, engine housing can avoid engine by
Infringement, therefore its structure plays very important effect with material.
The content of the invention
The present invention is in view of the above-mentioned problems existing in the prior art, it is proposed that the automobile hair that a kind of intensity is high, service life is long
Motivation case.
The purpose of the present invention is realized by following technical solution：A kind of automobile engine case, the automotive hood
Shell is made of aluminum alloy materials, and the aluminum alloy materials are made up of the composition of following mass percent：Mg：1.2-1.8%,
Si：1.8-2.5%, Cu：0.2-0.5%, Mn：0.2-0.3%, Zr：0.25-0.35%, Er：0.1-0.2%, Sheet Graphite：
2-3%, surplus are Al and inevitable impurity element.
Automobile engine case of the present invention is made of aluminum alloy materials, and the density of aluminium alloy is relatively low, and specific strength is high, and aluminium closes
Golden case is relatively stable using outward appearance for a long time, and the fine and close oxide-film of oxidation generation easily occurs for surface in large natural environment,
And the oxide-film is almost colourless, does not affect the appearance, internal material can be avoided further to be corroded again.With other materials phase
Than the modulus of elasticity of aluminium alloy is small, and what is occurred when case is by equal stress should diminish, tired during resistance engine use
The ability that labor is destroyed is higher.The processability of aluminium alloy is excellent simultaneously, and production technology is more ripe so that automobile hair of the present invention
Motivation case is appropriate for the production of industrial mass metaplasia.
In the aluminum alloy materials that automobile engine case of the present invention uses, Mn elements can enable aluminum alloy to the thick Chinese of middle script
Font or the A1FeSi phases of bone shape become granular A1FeMnSi phases so as to reduce adverse effects of the Fe to alloy strength.This
In invention aluminium alloy, the presence of Fe elements easily makes whole alloy property become fragile, therefore it is harmful element, and the present invention is by adding
Enter Mn elements, the harm of Fe elements can be eliminated, so as to improve the mechanical performance of gearbox body of the present invention.The present invention is contained using above-mentioned
The Mn elements of amount, if Mn contents are more than 0.3% in aluminum alloy materials of the present invention, then Mn elements can not be dissolved completely in aluminium conjunction
In golden material, its precipitated phase is caused to increase, grain refinement effect reduces, then itself turns into impurity element.
Wherein, the present invention in aluminum alloy materials by adding micro Zr elements, to the mechanicalness of automobile engine case
There can be certain invigoration effect.The most significant effect of Zr elements is embodied in the recrystallization behavior for suppressing alloy, makes alloy deformation
Caused high density dislocation and fibr tissue are preserved in process, so as to be to obtain having non-recrystallized structure
Semi-finished product provide possibility, and alloy semi-finished product have more excellent performance because non-recrystallized structure be present.In the present invention, Zr
Constituent content is more than 0.35%, then can result in feather crystal and thick intermetallic compound, then can be to vapour of the present invention
Car engine case produces harmful effect, therefore the present invention uses the Zr elements of mentioned component.
Er is both a kind of transition elements, and a kind of rare earth element, and it reacts the A1 to be formed with Al3Er phases have very strong
Heat endurance, even if remaining to keep good symbiosis and epibiosis with matrix under high temperature.Er is that effective crystal grain is thin in aluminium alloy
Agent, recrystallization inhibitor and dispersion-strengtherning agent.The present invention obtains the high vapour of intensity by adding Er energy refining aluminum alloy crystal grain
Car engine case.
In automobile engine case of the present invention, Sheet Graphite is also added into aluminum alloy materials.Sheet Graphite and aluminium
Alloy substrate is tightly combined, the defects of interface flawless, hole.The present invention, can be in aluminium alloy by adding Sheet Graphite
Support is played a part of in portion, the stiff stability structure of Sheet Graphite, can give obtained aluminium alloy enhancing increasing degree.Preferably, institute
It is to pass through pretreated Sheet Graphite to state Sheet Graphite, and the pretreatment comprises the following steps：It is by Sheet Graphite and quality
Ball milling 8-9h after Sheet Graphite quality 2-5% SiC particulate mixing, sieves after drying, room temperature is cooled to after vacuum heating-press sintering.
Wherein, the B that quality is SiC particulate quality 1-2% is contained in SiC particulate4C, ball-milling medium are absolute ethyl alcohol, vacuum heating-press sintering
When, programming rate is 10 DEG C/min, and 1h is incubated at 2100 DEG C, wherein in holding stage pressurization 40MPa and pressurize 1h.
Sheet Graphite is pre-processed using SiC particulate in the present invention, SiC powder Dispersed precipitate Sheet Graphite matrix it
In, the hole of Sheet Graphite matrix is filled up, in hot pressing, slow Plastic Flow occurs for Sheet Graphite and SiC, makes material
Stomata diminish, microstructure is densified, and with the increase of SiC content, stomata is reduced, and material is finer and close；Accordingly
SiC particulate surrounding space reduces, and limits particle growth, causes particle refinement arrangement more uniform, while SiC particulate is by isolating
Distribution develop into network connection architecture, the mechanical strength of SiC enhancing Sheet Graphites has obtained significantly improving, from
And the intensity of automobile engine case of the present invention is set also to be improved.
It is another object of the present invention to provide a kind of method for preparing above-mentioned automobile engine case, the preparation side
Method comprises the following steps：It will be melted for the aluminum alloy materials for preparing engine housing, after it is completely melt, adding quality is
Aluminum alloy materials quality 3-5% rare earth alterative Pr2(CO3)3, melt treatment temperature is 700~800 DEG C；Cool again and cast
Automobile engine case casting；Automobile engine case casting is heat-treated, obtains automobile engine after differential arc oxidation processing
Case finished product.
In a kind of above-mentioned preparation method of automobile engine case, the aluminum alloy melting temperature is 750-850 DEG C.This
Invention with the addition of Determination of multiple metal elements in aluminum alloy materials, and to ensure that metallic element is completely melt, the present invention uses above-mentioned temperature
Spend scope.
In a kind of above-mentioned preparation method of automobile engine case, by adding rare earth alterative Pr2(CO3)3, can make
The form and size of Si phases change, and have good lasting modification effects.Internal flaw be present in growth in Eutectic Silicon in Al-Si Cast Alloys, and
Preferential growth is into en plaque in a certain direction, and the Eutectic Silicon in Al-Si Cast Alloys of en plaque can be grown into twin by low-angle mechanism and wide-angle mechanism
It is brilliant.The addition of alterant element, the intrinsic step of eutectic silicon growth is eliminated, produce a large amount of high density twins, be changed into twin re-entrant angle
Growth mechanism, Eutectic Silicon in Al-Si Cast Alloys are in fibre-like.Suppress the growth of Eutectic Silicon in Al-Si Cast Alloys, it is necessary to there is external particle to block its intrinsic step, and Pr2
(CO3)3It can be played an important role as rare earth alterative.
In a kind of above-mentioned preparation method of automobile engine case, the heat treatment includes solution treatment, one-level timeliness
Processing and secondary time effect processing.The heat treatment comprises the following steps：Solution treatment：Temperature is 470-500 DEG C, time 70-
80min；One-level Ageing Treatment：Temperature is 110-120 DEG C, time 8-9h；Secondary time effect processing：Temperature is 160-170 DEG C, when
Between be 3-4h.The heat treatment method that the present invention is handled using solution treatment and two-stage time effect, wherein solution treatment primarily to
It is to obtain the supersaturated solid solution of high concentration.The change of performance and phase constituent, alloy original structure and quenching shape after solution treatment
The series of factors such as state tissue signature, quenching condition are relevant, and different-alloy performance change differs widely；And pass through firsts and seconds
Aluminium alloy after Ageing Treatment, there is high intensity and good anti-stress corrosion performance.
In a kind of above-mentioned preparation method of automobile engine case, the bath composition of the differential arc oxidation processing is：
Sodium metasilicate：10-15g/L, neopelex：3-5g/L, graphene dispersing solution：5-7ml/L.Electrolyte temperature 20-25
DEG C, pH12-12.5.By adding graphene dispersing solution in the electrolytic solution, change to a certain extent electrolyte electrical conductivity,
The parameters such as viscosity, this reduces aluminum alloy surface arcing voltage, reduces Single Pulse Discharge energy, and micro-arc discharge microcell
Distribution tends to be uniform so that the film layer compacted zone pore size of generation is smaller, and is produced without obvious micro-crack, to corrosive liquid ion
Deep obstruction it is larger.A graphene dispersing solution part is participated among the reaction of formation of film layer, though do not change film surface knot
The type of crystalline phase, but change the content of film surface individual element；Another part enters discharge channel with electrolyte, with
The rapid reduction of temperature, graphene dispersing solution are just present in discharge channel in the form of particulate matter, to corrosive medium ion
Obvious inhibition is deeply played, and then improves the corrosion resisting property of differential arc oxidation film layer, so that car engine of the present invention
Hood shell has excellent decay resistance.
Compared with prior art, the invention has the advantages that：
1st, automobile engine case of the present invention is prepared using aluminum alloy materials, and the reasonable compatibility composition of aluminium alloy
Composition and its mass percent, the automobile engine case that can make to obtain have light weight, intensity high, corrosion-resistant and other effects.
2nd, automobile engine case of the present invention adds Sheet Graphite in aluminum alloy materials, and Sheet Graphite is carried out
Pretreatment, can be such that Sheet Graphite is tightly combined with alloy matrix aluminum, the defects of interface flawless, hole, so as to strengthen aluminium
The hardness of alloy.
3rd, rare earth alterative Pr is added in automobile engine case preparation process of the present invention2(CO3)3, while it is heat-treated bag
Solution treatment, one-level Ageing Treatment and secondary time effect processing are included, micro-arc oxidation films are also prepared using specific composition, enabled to
To aluminum alloy materials have decay resistance.
Embodiment
It is the embodiment of the present invention below, technical scheme is further described, but the present invention
It is not limited to these embodiments.
Embodiment 1
It will be melted for the aluminum alloy materials for preparing engine housing, after it is completely melt, addition quality is aluminium alloy
The rare earth alterative Pr of quality of materials 3%2(CO3)3, melt treatment temperature is 700 DEG C；Cool again and cast to obtain automotive hood
Shell casting；Automobile engine case casting is heat-treated, obtains automobile engine case finished product after differential arc oxidation processing；Its
In, aluminum alloy materials are made up of the composition of following mass percent：Mg：1.2%, Si：1.8%, Cu：0.2%, Mn：0.2%,
Zr：0.25%, Er：0.1%, the Sheet Graphite pre-processed through SiC particulate：2%, surplus is Al and inevitable impurity member
Element；Aluminum alloy melting temperature is 750 DEG C；Heat treatment comprises the following steps：Solution treatment：Temperature is 470 DEG C, time 70min；
One-level Ageing Treatment：Temperature is 110 DEG C, time 8h；Secondary time effect processing：Temperature is 160 DEG C, time 3h；Differential arc oxidation
The bath composition of processing is：Sodium metasilicate：10g/L, neopelex：3g/L, graphene dispersing solution：5ml/L, electrolysis
20 DEG C of liquid temperature degree, pH12.
Embodiment 2
It will be melted for the aluminum alloy materials for preparing engine housing, after it is completely melt, addition quality is aluminium alloy
The rare earth alterative Pr of quality of materials 3.5%2(CO3)3, melt treatment temperature is 725 DEG C；Cool again and cast to obtain automobile engine
Case casting；Automobile engine case casting is heat-treated, obtains automobile engine case finished product after differential arc oxidation processing；Its
In, aluminum alloy materials are made up of the composition of following mass percent：Mg：1.4%, Si：1.9%, Cu：0.3%, Mn：0.3%,
Zr：0.28%, Er：0.13%, the Sheet Graphite pre-processed through SiC particulate：2.3%, surplus be Al and inevitably it is miscellaneous
Prime element；Aluminum alloy melting temperature is 780 DEG C；Heat treatment comprises the following steps：Solution treatment：Temperature is 478 DEG C, and the time is
73min；One-level Ageing Treatment：Temperature is 113 DEG C, time 8.2h；Secondary time effect processing：Temperature is 162 DEG C, and the time is
3.2h；Differential arc oxidation processing bath composition be：Sodium metasilicate：11g/L, neopelex：3.5g/L, graphene point
Dispersion liquid：5.5ml/L, 22 DEG C of electrolyte temperature, pH12.2.
Embodiment 3
It will be melted for the aluminum alloy materials for preparing engine housing, after it is completely melt, addition quality is aluminium alloy
The rare earth alterative Pr of quality of materials 4%2(CO3)3, melt treatment temperature is 750 DEG C；Cool again and cast to obtain automotive hood
Shell casting；Automobile engine case casting is heat-treated, obtains automobile engine case finished product after differential arc oxidation processing；Its
In, aluminum alloy materials are made up of the composition of following mass percent：Mg：1.5%, Si：2.2%, Cu：0.35%, Mn：
0.25%, Zr：0.3%, Er：0.15%, the Sheet Graphite pre-processed through SiC particulate：2.5%, surplus is Al and can not kept away
The impurity element exempted from；Aluminum alloy melting temperature is 800 DEG C；Heat treatment comprises the following steps：Solution treatment：Temperature is 485 DEG C, when
Between be 75min；One-level Ageing Treatment：Temperature is 115 DEG C, time 8.5h；Secondary time effect processing：Temperature is 165 DEG C, and the time is
3.5h；Differential arc oxidation processing bath composition be：Sodium metasilicate：13g/L, neopelex：4g/L, graphene dispersion
Liquid：6ml/L, 23 DEG C of electrolyte temperature, pH12.3.
Embodiment 4
It will be melted for the aluminum alloy materials for preparing engine housing, after it is completely melt, addition quality is aluminium alloy
The rare earth alterative Pr of quality of materials 4.5%2(CO3)3, melt treatment temperature is 780 DEG C；Cool again and cast to obtain automobile engine
Case casting；Automobile engine case casting is heat-treated, obtains automobile engine case finished product after differential arc oxidation processing；Its
In, aluminum alloy materials are made up of the composition of following mass percent：Mg：1.7%, Si：2.4%, Cu：0.4%, Mn：0.28%,
Zr：0.32%, Er：0.18%, the Sheet Graphite without SiC particulate pretreatment：2.8%, surplus is for Al and inevitably
Impurity element；Aluminum alloy melting temperature is 830 DEG C；Heat treatment comprises the following steps：Solution treatment：Temperature is 495 DEG C, and the time is
78min；One-level Ageing Treatment：Temperature is 118 DEG C, time 8.8h；Secondary time effect processing：Temperature is 168 DEG C, and the time is
3.8h；Differential arc oxidation processing bath composition be：Sodium metasilicate：14g/L, neopelex：4.5g/L, graphene point
Dispersion liquid：6.5ml/L, 24 DEG C of electrolyte temperature, pH12.4.
Embodiment 5
It will be melted for the aluminum alloy materials for preparing engine housing, after it is completely melt, addition quality is aluminium alloy
The rare earth alterative Pr of quality of materials 5%2(CO3)3, melt treatment temperature is 800 DEG C；Cool again and cast to obtain automotive hood
Shell casting；Automobile engine case casting is heat-treated, obtains automobile engine case finished product after differential arc oxidation processing；Its
In, aluminum alloy materials are made up of the composition of following mass percent：Mg：1.8%, Si：2.5%, Cu：0.5%, Mn：0.3%,
Zr：0.35%, Er：0.2%, the Sheet Graphite pre-processed through SiC particulate：3%, surplus is Al and inevitable impurity member
Element；Aluminum alloy melting temperature is 850 DEG C；Heat treatment comprises the following steps：Solution treatment：Temperature is 500 DEG C, time 80min；
One-level Ageing Treatment：Temperature is 120 DEG C, time 9h；Secondary time effect processing：Temperature is 170 DEG C, time 5h；Differential arc oxidation
The bath composition of processing is：Sodium metasilicate：15g/L, neopelex：5g/L, graphene dispersing solution：7ml/L, electrolysis
25 DEG C of liquid temperature degree, pH12.5.
Comparative example 1
With differing only in for embodiment 1, the aluminium alloy of the comparative example automobile engine case uses common aluminum alloy, its
He is same as Example 1, and here is omitted.
Comparative example 2
With differing only in for embodiment 1, lamella is added without in the aluminum alloy materials of the comparative example automobile engine case
Graphite, other are same as Example 1, and here is omitted.
Comparative example 3
With differing only in for embodiment 1, without adding alterant in the comparative example automobile engine case preparation process,
Other are same as Example 1, and here is omitted.
Comparative example 4
With differing only in for embodiment 1, differential arc oxidation is not used in the comparative example automobile engine case preparation process,
Other are same as Example 1, and here is omitted.
Comparative example 5
With differing only in for embodiment 1, the electrolysis of differential arc oxidation in the comparative example automobile engine case preparation process
Liquid uses general electrolytic liquid, and other are same as Example 1, and here is omitted.
Automobile engine case progressive in above-described embodiment 1-5 and comparative example 1-5 can be tested, test result such as table 1
Shown in.
Table 1：Automobile engine case the performance test results in embodiment 1-5 and comparative example 1-5
Automobile engine case of the present invention is made of aluminum alloy materials it can be seen from the above results, and reasonable compatibility
The component and mass percent of aluminium alloy, while rare earth alterative Pr is added in preparation process2(CO3)3, heat treatment includes solid
Molten processing, one-level Ageing Treatment and secondary time effect processing, also prepare micro-arc oxidation films using specific composition, enable to
Aluminum alloy materials have decay resistance.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be substituted using similar mode, but simultaneously
Do not deviate by the spirit of the present invention or surmount scope defined in appended claims.
It is skilled to this area although having been made a detailed description to the present invention and being cited some specific embodiments
For technical staff, as long as it is obvious that can make various changes or correct without departing from the spirit and scope of the present invention.
Claims (8)
1. a kind of automobile engine case, it is characterised in that the automobile engine case is made of aluminum alloy materials, described
Aluminum alloy materials are made up of the composition of following mass percent：Mg：1.2-1.8%, Si：1.8-2.5%, Cu：0.2-0.5%,
Mn：0.2-0.3%, Zr：0.25-0.35%, Er：0.1-0.2%, Sheet Graphite：2-3%, surplus is for Al and unavoidably
Impurity element.
2. a kind of automobile engine case according to claim 1, it is characterised in that the Sheet Graphite is by pre- place
Sheet Graphite after reason, the pretreatment comprise the following steps：It is Sheet Graphite quality 2-5%'s by Sheet Graphite and quality
Ball milling 8-9h after SiC particulate mixing, sieves after drying, room temperature is cooled to after vacuum heating-press sintering.
3. a kind of automobile engine case according to claim 2, it is characterised in that contain quality in the SiC particulate
For SiC particulate quality 1-2% B4C。
A kind of 4. preparation method of automobile engine case as claimed in claim 1, it is characterised in that the preparation method bag
Include following steps：It will be melted for the aluminum alloy materials for preparing engine housing, after it is completely melt, adds quality and closed for aluminium
Golden quality of materials 3-5% rare earth alterative Pr2(CO3)3, melt treatment temperature is 700~800 DEG C；Cool again and cast to obtain automobile
Engine housing casting；Automobile engine case casting is heat-treated, obtains automobile engine case after differential arc oxidation processing
Finished product.
5. the preparation method of automobile engine case according to claim 4, it is characterised in that the aluminum alloy melting temperature
Spend for 750-850 DEG C.
6. the preparation method of automobile engine case according to claim 4, it is characterised in that the heat treatment includes solid
Molten processing, one-level Ageing Treatment and secondary time effect processing.
7. the preparation method of automobile engine case according to claim 6, it is characterised in that the heat treatment is included such as
Lower step：Solution treatment：Temperature is 470-500 DEG C, time 70-80min；One-level Ageing Treatment：Temperature is 110-120 DEG C,
Time is 8-9h；Secondary time effect processing：Temperature is 160-170 DEG C, time 3-4h.
8. the preparation method of automobile engine case according to claim 4, it is characterised in that the differential arc oxidation processing
Bath composition be：Sodium metasilicate：10-15g/L, neopelex：3-5g/L, graphene dispersing solution：5-7ml/L.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710771531.4A CN107675036A (en) | 2017-08-31 | 2017-08-31 | A kind of automobile engine case |
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|---|---|---|---|
| CN201710771531.4A CN107675036A (en) | 2017-08-31 | 2017-08-31 | A kind of automobile engine case |
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| CN107675036A true CN107675036A (en) | 2018-02-09 |
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