CN106086490A - A kind of for aluminium alloy casting engine cylinder cover and preparation method thereof - Google Patents
A kind of for aluminium alloy casting engine cylinder cover and preparation method thereof Download PDFInfo
- Publication number
- CN106086490A CN106086490A CN201610720595.7A CN201610720595A CN106086490A CN 106086490 A CN106086490 A CN 106086490A CN 201610720595 A CN201610720595 A CN 201610720595A CN 106086490 A CN106086490 A CN 106086490A
- Authority
- CN
- China
- Prior art keywords
- alloy
- aluminium
- engine cylinder
- cylinder cover
- aluminium alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- 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
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a kind of aluminium alloy for casting engine cylinder cover, the mass percent of al alloy component is: the Si of 6.5 7.5%, the Mg of 0.25 0.45%, the Fe of≤0.17%, the Ti of 0.08 0.25%, the Sr of 0.005 0.015%, and remaining is Al.The invention still further relates to the preparation method of this aluminium alloy, get the raw materials ready including by mentioned component requirement；Fine aluminium ingot in crucible furnace, pure silicon are heated to 760 ± 10 DEG C of fusings；Pure magnesium, aluminum titanium intermediate alloy bell jar are pressed into bottom aluminum, silicon solution, and control temperature between 810 860 DEG C, carry out alloying；After alloying completes, temperature is controlled between 740 ± 10 DEG C, add aluminium-strontium master alloy AlSr；Logical high pure nitrogen carries out degasification；Meanwhile, coverture is added；Skim after standing；Aluminium alloy is poured in the mould of preheating, obtain the aluminium alloy for casting engine cylinder cover.The present invention is after T6 heat treatment, and tensile strength reaches 305 325MPa, and yield strength reaches 240 260MPa, and hardness reaches 90 110HBS, and elongation percentage reaches 6%；Intensity, toughness all disclosure satisfy that engine cylinder cover properties of product requirement.
Description
Technical field
The present invention relates to aluminum alloy materials, be specifically related to a kind of aluminium alloy for casting engine cylinder cover and preparation side thereof
Method.Particularly there is the aluminum alloy materials of excellent mechanical properties (high intensity, high tenacity).
Background technology
At present, each company is when producing automobile engine cylinder head product, and its melting, casting, heat treatment etc. produce equipment
Diversity, the casting of employing, heat treatment process parameter have respective use system；And different company sets at cylinder cap product structure
Timing is inconsistent to material performance requirement, so, the aluminum alloy materials that each company uses is all on the basis of the versatile material trade mark
On be optimized design, form the proprietary material trade mark.
Along with electromotor TC(turbocharging technology), GDI(gasoline engine direct injection technology), VVT(engine variable-valve timing
Technology) etc. the integrated application of new technique, cylinder cap product structure design becomes increasingly complex, and casting manufacturability degree-of-difficulty factor increases；Cylinder
Faced by lid bottom surface and combustor, the requirement of aluminum alloy materials performance is high intensity, high tenacity, and needs yield strength is proposed tool
While body numerical requirements, i.e. tensile strength are maintained at ＞ 300MPa, yield strength is maintained at ＞ 240MPa level, elongation percentage palpus
Reach 6%.AC4CH is the aluminum alloy materials that engine cylinder cover is conventional, and it is mainly composed of Si6.5-7.5%, Mg0.25-0.45%,
Fe≤0.20%；But, it is after T6 heat treatment, tensile strength ＞ 250MPa, and elongation percentage reaches 5%, not wants yield strength
Ask；This material cannot meet the cylinder cap product design performance requirement that the new techniques such as TC, GDI, VVT are integrated.
CN103540812A discloses " a kind of Aluminum alloy material for engine cylinder cover and preparation method thereof ", wherein electromotor
The composition of cylinder cap aluminum alloy materials is configured to by mass percentage: Si7.5%, Mg0.35%, Cu0.5-1.5%, Ni0.7-
2.3%, Mn0.2-0.8%, Fe0.3-0.9%, surplus is Al.Its preparation method, according to the following steps operation: weigh work by proportional quantity
Industry fine aluminium, silicon metal, pure nickel, Al-Cu50% intermediate alloy, Al-Fe20% intermediate alloy and Al-Mn15% intermediate alloy, by upper
State each raw material to add in crucible electrical resistance furnace, be warming up to 850 DEG C until all melting in molten condition, be then cooled to 730-750
DEG C, with the Mg of bell jar press-in proportional quantity, after stirring, stand 20min；Add compound microcosmic salt alterant, after stirring in
730-750 DEG C of insulation stands 20min；It is subsequently added degasser hexachlorethane, stands in 730-750 DEG C of insulation after stirring
20min；After taking off removing dross, aluminium alloy is poured in the mould of preheating, take out after cooling, use T6 Technology for Heating Processing to carry out at heat
Aluminum alloy materials is obtained after reason.Compared with existing aluminium alloy cylinder cover material, its room temperature (20 DEG C) tensile strength keeps not substantially
Become, and Testing Tensile Strength at Elevated Temperature (300 DEG C) significantly improves.Certainly, this is a good try of art.
Summary of the invention
It is an object of the invention to provide a kind of aluminium alloy for casting engine cylinder cover, it is after T6 heat treatment, tension
Intensity reaches 305-325MPa, and yield strength reaches 240-260MPa, and hardness reaches 90-110HBS, and elongation percentage reaches 6%；By force
Degree, toughness all disclosure satisfy that the new technique integrated engine cylinder cap properties of product requirements such as TC, GDI, VVT.
The present invention also provides for the preparation method of above-mentioned a kind of aluminium alloy for casting engine cylinder cover.
It is an object of the invention to be achieved through the following technical solutions:
A kind of aluminium alloy (Al-Si-Mg-Ti-Sr system) for casting engine cylinder cover, is characterized in that, the matter of al alloy component
Amount percentage ratio is: the Mg of the Si of 6.5-7.5%, 0.25-0.45%, the Ti of the Fe of≤0.17%, 0.08-0.25%, 0.005-
The Sr of 0.015%, remaining is Al.
The preparation method of a kind of aluminium alloy for casting engine cylinder cover, is characterized in that, comprise the following steps:
The first step, is prepared in the middle of fine aluminium ingot (commercial-purity aluminium), pure silicon, pure magnesium, aluminum titanium by the mass percent requirement of mentioned component
Alloy, aluminium-strontium master alloy；
Second step, the fine aluminium ingot, the pure silicon that prepare in the addition first step in crucible furnace are heated to 760 ± 10 DEG C of fusings；
3rd step, after added fine aluminium ingot, pure silicon have all melted, in the middle of pure magnesium ready in the first step, aluminum titanium
Alloy bell jar is pressed into bottom aluminum, silicon solution, and temperature controls to carry out alloying between 810-860 DEG C；
4th step, after alloying completes, controls temperature between 740 ± 10 DEG C, adds ready aluminum strontium in the first step
Intermediate alloy AlSr, as alterant；
5th step, is passed through the purity high pure nitrogen not less than 99.997% and carries out degasification, and the degasification time is 20-30min；Meanwhile, press
The 0.2-0.5% of aluminium alloy weight adds coverture；
6th step, after having ventilated, skims after standing 10-15min；
7th step, pours in the mould of preheating by aluminium alloy, takes out after cooling, obtains the aluminum for casting engine cylinder cover and closes
Gold.
Beneficial effects of the present invention is as follows:
(1) owing to the addition of the Ti alloy of 0.08-0.25%, the TiAl of formation3Intermetallic compound, when this material is crystallization
Heterogeneous necleus, size is small and large number of, Dispersed precipitate, plays the effect of refinement cast sturcture, improves micro-group of alloy
Knit structure, improve intensity and elongation percentage.
(2) owing to the addition of the Sr alloy of 0.002-0.015%, α dendritic growth being had significant impact, Sr can make α dendrite
Quantity increases, and dendrite when not going bad can be made substantially to shorten little, and secondary dendrite also obtains improvement and diminishes, through heat
After process, silicon is tiny point-like or spherical, thus ensure that Mg2The effect of Si strengthening body and the plasticity of aluminum substrate are filled
Distribution is waved, thus improves the performance of aluminium alloy.
Eutectic Si in Cast aluminium alloy gold is thick needle-like or lamellar, whole Al matrix is played dissection, can show
Write intensity and the toughness reducing product.Rotten is exactly that the shape of these thick needle-likes or lamellar eutectic Si is become spherical or connect
Subsphaeroidal, thus reduce its dissection to Al matrix, improve product strength.
(3) aluminium alloy that the present invention provides, after T6 heat treatment, tensile strength reaches 305-325MPa, and yield strength reaches
240-260MPa, hardness reaches 90-110HBS, and elongation percentage reaches 6%；Breach similar trade mark Cast aluminium alloy gold comprehensive mechanical
Bottleneck that can not be high, its high intensity, high tenacity disclosure satisfy that the new technique integrated engine cylinder cap properties of product such as TC, GDI, VVT
Requirement.
Accompanying drawing explanation
Fig. 1 is the aluminium alloy micostructure structure chart (Eutectic Silicon in Al-Si Cast Alloys of visible obvious bodkin shape) not adding strontium alloy；
Fig. 2 is that (visible tissue substantially refines the microstructure figure after T6 heat treatment of the aluminium alloy after adding strontium alloy, bodkin
The Eutectic Silicon in Al-Si Cast Alloys of shape has turned into rod-short or point-like, and alloy phase Dispersed precipitate is in the base).
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1:
The first step, prepares fine aluminium ingot 624Kg, pure silicon 49Kg, pure magnesium 2.5Kg, aluminum titanium intermediate alloy 23.8Kg, aluminium-strontium master alloy
0.7Kg, raw material gross weight 700Kg.
Second step, the fine aluminium ingot, the pure silicon that prepare in the addition first step in crucible furnace are heated to 760 DEG C ± 10 DEG C fusings；
3rd step, after added fine aluminium ingot, pure silicon have all melted, in the middle of pure magnesium ready in the first step, aluminum titanium
Alloy bell jar is pressed into bottom aluminum, silicon solution, controls temperature to carry out alloying at about 860 DEG C.
4th step, after alloying completes, controls between 740 DEG C ± 10 DEG C by temperature, adds in the first step and is ready to
Aluminium-strontium master alloy AlSr, as alterant；
5th step, is passed through the purity high pure nitrogen not less than 99.997% and carries out degasification, and the degasification time is 25min；Meanwhile, by closing
The 0.2-0.5% of gold liquid weight adds coverture, to reduce inspiration capacity and the oxidation of aluminium alloy；
6th step, after having ventilated, skims after standing 15min；
7th step, pours in the mould of preheating by aluminium alloy, takes out after cooling, obtains the aluminum for casting engine cylinder cover and closes
Gold.
Obtain the aluminium alloy for casting engine cylinder cover；The mass percent of its composition is: Si7.10%, Mg0.36%,
Fe0.11%, Ti0.17%, Sr0.010%, surplus Al；This aluminium alloy is after T6 heat treatment, and yield strength is 248MPa, and tension is strong
Degree is 316MPa, and hardness is 105HBS, and elongation percentage is 6.8%.
Embodiment 2:
The first step, prepares fine aluminium ingot 612Kg, pure silicon 52Kg, pure magnesium 3Kg, aluminum titanium intermediate alloy 32Kg, aluminium-strontium master alloy 1Kg,
Raw material gross weight 700Kg.
Second step, the fine aluminium ingot, the pure silicon that prepare in the addition first step in crucible furnace are heated to 760 DEG C ± 10 DEG C fusings；
3rd step, after added fine aluminium ingot, pure silicon have all melted, in the middle of pure magnesium ready in the first step, aluminum titanium
Alloy bell jar is pressed into bottom aluminum, silicon solution, controls temperature to carry out alloying at about 810 DEG C.
4th step, after alloying completes, controls between 740 DEG C ± 10 DEG C by temperature, adds in the first step and is ready to
Aluminium-strontium master alloy AlSr, as alterant；
5th step, is passed through the purity high pure nitrogen not less than 99.997% and carries out degasification, and the degasification time is 25min；Meanwhile, by closing
The 0.2-0.5% of gold liquid weight adds coverture, to reduce inspiration capacity and the oxidation of aluminium alloy；
6th step, after having ventilated, skims after standing 15min；
7th step, pours in the mould of preheating by aluminium alloy, takes out after cooling, obtains the aluminum for casting engine cylinder cover and closes
Gold.
Obtain the aluminium alloy for casting engine cylinder cover；The mass percent of its composition is: Si7.43%, Mg0.43%,
Fe0.12%, Ti0.23%, Sr0.014%, surplus Al；This aluminium alloy is after T6 heat treatment, and yield strength is 251MPa, and tension is strong
Degree is 315MPa, and hardness is 106HBS, and elongation percentage is 6.8%.
Embodiment 3:
The first step, prepares fine aluminium ingot 639.5Kg, pure silicon 46Kg, pure magnesium 2Kg, aluminum titanium intermediate alloy 12Kg, aluminium-strontium master alloy
0.5Kg, raw material gross weight 700Kg.
Second step, the fine aluminium ingot, the pure silicon that prepare in the addition first step in crucible furnace are heated to 760 ± 10 DEG C of fusings；
3rd step, after added fine aluminium ingot, pure silicon have all melted, in the middle of pure magnesium ready in the first step, aluminum titanium
Alloy bell jar is pressed into bottom aluminum, silicon solution, controls temperature to carry out alloying at about 840 DEG C.
4th step, after alloying completes, controls between 740 DEG C ± 10 DEG C by temperature, adds in the first step and is ready to
Aluminium-strontium master alloy AlSr, as alterant；
5th step, is passed through the purity high pure nitrogen not less than 99.997% and carries out degasification, and the degasification time is 25min；Meanwhile, by closing
The 0.2-0.5% of gold liquid weight adds coverture, to reduce inspiration capacity and the oxidation of aluminium alloy；
6th step, after having ventilated, skims after standing 15min；
7th step, pours in the mould of preheating by aluminium alloy, takes out after cooling, obtains the aluminum for casting engine cylinder cover and closes
Gold.
Obtain the aluminium alloy for casting engine cylinder cover；The mass percent of its composition is: Si6.57%, Mg0.28%,
Fe0.12%, Ti0.086%, Sr0.0071%, surplus Al；This aluminium alloy is after T6 heat treatment, and yield strength is 249MPa, tension
Intensity is 314MPa, and hardness is 105HBS, and elongation percentage is 6.7%.
The trade mark of coverture described in three above embodiment is KL-FG, for Xuzhou Kun Long metal material company limited
Product；Also may select the coverture of other trade mark.
Claims (2)
1. for casting an aluminium alloy for engine cylinder cover, it is characterized in that, the mass percent of al alloy component is: 6.5-
The Mg of the Si of 7.5%, 0.25-0.45%, the Sr of the Ti of the Fe of≤0.17%, 0.08-0.25%, 0.005-0.015%, remaining is
Al。
The preparation method of a kind of aluminium alloy for casting engine cylinder cover, is characterized in that, including with
Lower step:
The first step, is prepared in the middle of fine aluminium ingot (commercial-purity aluminium), pure silicon, pure magnesium, aluminum titanium by the mass percent requirement of mentioned component
Alloy, aluminium-strontium master alloy；
Second step, the fine aluminium ingot, the pure silicon that prepare in the addition first step in crucible furnace are heated to 760 ± 10 DEG C of fusings；
3rd step, after added fine aluminium ingot, pure silicon have all melted, in the middle of pure magnesium ready in the first step, aluminum titanium
Alloy bell jar is pressed into bottom aluminum, silicon solution, and temperature controls to carry out alloying between 810-860 DEG C；
4th step, after alloying completes, controls temperature between 740 ± 10 DEG C, adds ready aluminum strontium in the first step
Intermediate alloy AlSr, as alterant；
5th step, is passed through the purity high pure nitrogen not less than 99.997% and carries out degasification, and the degasification time is 20-30min；Meanwhile, press
The 0.2-0.5% of aluminium alloy weight adds coverture；
6th step, after having ventilated, skims after standing 10-15min；
7th step, pours in the mould of preheating by aluminium alloy, takes out after cooling, obtains the aluminum for casting engine cylinder cover and closes
Gold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610720595.7A CN106086490A (en) | 2016-08-25 | 2016-08-25 | A kind of for aluminium alloy casting engine cylinder cover and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610720595.7A CN106086490A (en) | 2016-08-25 | 2016-08-25 | A kind of for aluminium alloy casting engine cylinder cover and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106086490A true CN106086490A (en) | 2016-11-09 |
Family
ID=57225486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610720595.7A Pending CN106086490A (en) | 2016-08-25 | 2016-08-25 | A kind of for aluminium alloy casting engine cylinder cover and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106086490A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260515A (en) * | 2019-05-22 | 2019-09-20 | 程银萍 | Condensation gas boiler heat exchanger, heat exchanger alloy and boiler |
| CN115261685A (en) * | 2022-08-10 | 2022-11-01 | 中南大学 | Cast aluminum-silicon-magnesium alloy for automobile and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040011437A1 (en) * | 2002-02-28 | 2004-01-22 | Lin Jen C. | AI-Si-Mg-Mn casting alloy and method |
| CN101644203A (en) * | 2009-08-21 | 2010-02-10 | 重庆长安汽车股份有限公司 | Aluminium casting alloy cylinder cap |
| CN103341744A (en) * | 2013-07-10 | 2013-10-09 | 江苏东方龙机车集团有限公司 | Automobile wheel hub machining method |
| CN105525159A (en) * | 2014-09-29 | 2016-04-27 | 温兴琴 | A357 aluminum alloy material containing alterant Sr and Ti and preparation method thereof |
| CN105671379A (en) * | 2016-03-10 | 2016-06-15 | 徐杰 | High-silicon aluminum alloy cylinder jacket material and preparation method thereof |
-
2016
- 2016-08-25 CN CN201610720595.7A patent/CN106086490A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040011437A1 (en) * | 2002-02-28 | 2004-01-22 | Lin Jen C. | AI-Si-Mg-Mn casting alloy and method |
| CN101644203A (en) * | 2009-08-21 | 2010-02-10 | 重庆长安汽车股份有限公司 | Aluminium casting alloy cylinder cap |
| CN103341744A (en) * | 2013-07-10 | 2013-10-09 | 江苏东方龙机车集团有限公司 | Automobile wheel hub machining method |
| CN105525159A (en) * | 2014-09-29 | 2016-04-27 | 温兴琴 | A357 aluminum alloy material containing alterant Sr and Ti and preparation method thereof |
| CN105671379A (en) * | 2016-03-10 | 2016-06-15 | 徐杰 | High-silicon aluminum alloy cylinder jacket material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 阎庆斌 等: "《铸造合金熔炼及控制》", 31 March 2011, 长沙：中南大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260515A (en) * | 2019-05-22 | 2019-09-20 | 程银萍 | Condensation gas boiler heat exchanger, heat exchanger alloy and boiler |
| CN110260515B (en) * | 2019-05-22 | 2024-10-18 | 程银萍 | Condensing gas boiler heat exchanger, alloy for heat exchanger and boiler |
| CN115261685A (en) * | 2022-08-10 | 2022-11-01 | 中南大学 | Cast aluminum-silicon-magnesium alloy for automobile and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108165842B (en) | A kind of semisolid pressure casting high thermal conductivity aluminium alloy and its pressure casting method | |
| CN104561689B (en) | Heat-resistant cast aluminum alloy and extrusion casting method thereof | |
| CN108286001B (en) | A kind of preparation method of the high tough aluminium alloy of semisolid pressure casting | |
| CN104630578B (en) | High plasticity alloy cast aluminum and its gravitational casting preparation method | |
| CN110714148A (en) | High-performance semi-solid die-casting aluminum alloy and preparation method thereof | |
| CN101775530B (en) | Hypereutectic al-si alloy piston material | |
| CN105483465B (en) | A kind of die casting Al-Si-Mg cast aluminium alloy golds and preparation method thereof | |
| CN109439971A (en) | A kind of corrosion resistance, high-intensitive aluminium alloy and preparation method thereof | |
| CN104561690A (en) | High-plasticity cast aluminum alloy and extrusion casting preparation method thereof | |
| CN108103363A (en) | It is a kind of for refinement-alterant of hypoeutectic silumin alloy and its preparation method and application | |
| CN104073699A (en) | Al-Si-Cu-Mg cast aluminum alloy and preparation method thereof | |
| CN104561688A (en) | Heat-resistant cast aluminum alloy and gravity casting method thereof | |
| CN104561691A (en) | High-plasticity cast aluminum alloy and pressure casting preparation method thereof | |
| CN109055830A (en) | A kind of high tough aluminium alloy and preparation method thereof | |
| CN108396204A (en) | Hypoeutectic aluminum-silicon alloy casting and process method for improving performance thereof | |
| CN101775529A (en) | High-strength cast aluminum-silicon alloy for engine body and preparation method thereof | |
| CN108517446A (en) | A kind of preparation method of high toughness Al-alloy for evacuated die-casting process and products thereof | |
| CN110408807A (en) | A kind of hypoeutectic Al-Si casting alloy and preparation method thereof | |
| CN106676346A (en) | Aluminum alloy material capable of being anodized and suitable for semi-solid forming and preparing method of aluminum alloy material | |
| CN104630577A (en) | Heat-resistant cast aluminum alloy and pressure casting method thereof | |
| CN101876018A (en) | High-strength casting aluminium-silicon alloy for piston and preparation method thereof | |
| CN108165839A (en) | A kind of preparation method of automobile engine aluminum alloy die casting | |
| CN109735748A (en) | A kind of birmastic piston material and preparation method thereof | |
| CN108265207A (en) | A kind of high heat conduction aluminium alloy and preparation method thereof and radiator | |
| CN112030047A (en) | Preparation method of high-hardness fine-grain rare earth aluminum alloy material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161109 |