CN102367525A - Preparation method of cast aluminum alloy - Google Patents
Preparation method of cast aluminum alloy Download PDFInfo
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- CN102367525A CN102367525A CN2011103062241A CN201110306224A CN102367525A CN 102367525 A CN102367525 A CN 102367525A CN 2011103062241 A CN2011103062241 A CN 2011103062241A CN 201110306224 A CN201110306224 A CN 201110306224A CN 102367525 A CN102367525 A CN 102367525A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229910000838 Al alloy Inorganic materials 0.000 title abstract description 9
- 239000000956 alloy Substances 0.000 claims abstract description 35
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 34
- 238000007670 refining Methods 0.000 claims abstract description 34
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- 229910052793 cadmium Inorganic materials 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 238000007669 thermal treatment Methods 0.000 claims description 10
- 229910017888 Cu—P Inorganic materials 0.000 claims description 9
- 239000006025 fining agent Substances 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 229910018182 Al—Cu Inorganic materials 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 229910018134 Al-Mg Inorganic materials 0.000 claims description 4
- 229910018131 Al-Mn Inorganic materials 0.000 claims description 4
- 229910018125 Al-Si Inorganic materials 0.000 claims description 4
- 229910018467 Al—Mg Inorganic materials 0.000 claims description 4
- 229910018461 Al—Mn Inorganic materials 0.000 claims description 4
- 229910018520 Al—Si Inorganic materials 0.000 claims description 4
- 229910018575 Al—Ti Inorganic materials 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 230000002542 deteriorative effect Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- CNFDGXZLMLFIJV-UHFFFAOYSA-L manganese(II) chloride tetrahydrate Chemical compound O.O.O.O.[Cl-].[Cl-].[Mn+2] CNFDGXZLMLFIJV-UHFFFAOYSA-L 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 230000004048 modification Effects 0.000 abstract 2
- 238000003723 Smelting Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 229910000737 Duralumin Inorganic materials 0.000 description 7
- 239000004411 aluminium Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- WPPDFTBPZNZZRP-UHFFFAOYSA-N aluminum copper Chemical compound [Al].[Cu] WPPDFTBPZNZZRP-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910018594 Si-Cu Inorganic materials 0.000 description 1
- 229910008465 Si—Cu Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- IXSZQYVWNJNRAL-UHFFFAOYSA-N etoxazole Chemical compound CCOC1=CC(C(C)(C)C)=CC=C1C1N=C(C=2C(=CC=CC=2F)F)OC1 IXSZQYVWNJNRAL-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010120 permanent mold casting Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a preparation method of a cast aluminum alloy. The preparation method comprises seven steps of raw material preparation, smelting, grain refinement treatment, refinement, modification treatment, pouring and heat treatment. Through alloy component adjustment and addition of Al-Ti-B-C and a Cu-p composite grain-refining agent, alloy strength is improved. The cast aluminum alloy has good fluidity and good casting performances. Through reasonable control on technological parameters of the melting, the refinement, the modification treatment and the heat treatment, the cast aluminum alloy obtained by the preparation method has excellent comprehensive performances.
Description
Technical field
The present invention relates to casting field, particularly the aluminium alloy casting field.
Background technology
Duraluminum is a kind of younger metallic substance, just begins industrial application in 20 beginnings of the century.During the World War II, aluminium is mainly used in the manufacturing military aircraft.After the war; Because war industry is die-offed to the demand of aluminium; The aluminium industry member is just started to develop civil aluminum alloy; Make its range of application expand to construction industry, container package industry, transportation, electric power and national economy all departments such as electronic industry, machinery manufacturing industry and petrochemical complex, be applied in the middle of the daily life by aircraft industry.Now, more than the consumption of aluminium, scope is wide, is only second to iron and steel, becomes second largest metallic substance.The development of duraluminum can be traced back to ageing strengthening phenomenon in 1906 and chanced on by Alfred Wilm in Berlin, duralumin Duralumin, succeeds in developing thereupon and is used for aircraft structure.Developing multiple Al-Cu on this basis subsequently is alloy.France succeeds in developing A-U5GT ((W) si≤0.05%, (W) Fe≤0.10%) duraluminum, tensile strength (T4)>=275Mpa, SAEJ452-1989 in 20 beginnings of the century), NF and aerospace standard have been listed in the application of putting into production in; 201.0 (nineteen sixty-eights) of the U.S. aluminium association trade mark and 206.0 (1967) alloy all form through improving on the A-U5GT basis, and 204.0 duraluminums in 1974 are equal to A-U5GT; 201.0 trade name (AlCu4AgMgMn) is KO-1 (ASTM B26/B26 (M)-1999, tensile strength T7 state are 415Mpa, unit elongation 3%), receives USP protection, and composition contains Ag (0.4%-1.0%), the cost height.Russia BAJ110 principal element composition is equivalent to domestic ZL204, maintains secrecy but add trace element, only is used for military affairs or other demanding fields.
China has developed the casting aluminum alloy trades mark such as ZL204A, ZL205A, tensile strength 440Mpa under the ZL204A T5 state value, δ
5＞4%.By technological standard (GB1173-86) regulation; The tensile strength T5 state of ZL205A is 435Mpa; The T6 state is 465Mpa (GB/T1173-1995 standard, the tensile strength of ZL205A (T6) is 470Mpa) down, is one of cast aluminium alloy material that intensity is the highest in the world at present.The plasticity of ZL205A (T5) is good, and elongation can reach 7%, and this alloy is used widely in China Aeronautics and Astronautics field, but its composition contains V noble metal element, expensive; Simultaneously, need to make matrix metal with refined aluminium or rafifinal, not only increase cost, raw material supply is also restricted.In addition, on the ZL205A basis, add RE and developed ZL209, still added the high restriction of V element cost.The Lv Jie of Beijing Research Inst. of Aeronautic Material etc. develops a kind of duraluminum close with the ZL205A principal constituent; But contain 0.1%-0.25%V in the trace element; Its tensile strength between 385-405Mpa, elongation reaches 19%～23%; Rarely seen literature research report, and tensile strength is low slightly, and starting material contain expensive V.But the aluminum-copper alloy castability is relatively poor, is easy to generate defectives such as crackle in the castingprocesses, so be difficult to some baroque big-and-middle-sized foundry goods, this has limited the application of aluminum-copper alloy.
At present; The aluminum silicon alloy of widespread use has good castability, like good fluidity, resistance to air loss is good, shrinking percentage is little and hot cracking tendency is little, through after rotten and the thermal treatment; Has mechanical property preferably; Be present most widely used one type of duraluminum,, but still face the problem that mechanical property has much room for improvement like ZL101, ZL104 alloy.
One Chinese patent application numbers 200810204630.5 discloses a kind of preparation method of cast Al-Si alloy, and the advantage that it combines aluminium silicon and aluminum-copper alloy has produced a kind of new Al-Si-Cu alloy through optimization alloy compositions and preparation method.But the content of silicon is up to 6.5-7.5% in its alloy compositions, though castability is fair, its intensity is lower, has only about 300-320MPa.
Summary of the invention
To the deficiency of prior art, one of the object of the invention is to provide a kind of preparation method of y alloy y, solves the aluminium alloy casting performance and/or the relatively poor problem of mechanical property of prior art.
In order to reach the foregoing invention purpose, the technical scheme that the present invention adopts is:
A kind of preparation method of y alloy y comprises the steps:
1) batching: raw material uses pure Al and Al-12wt%Si, Al-50wt%Cu, Al-10wt%Mn, Cd, Al-5wt%Ti and Al-10wt%Mg master alloy;
2) melting: according to target component 2.5-3.5%Si, 5.5-6.5%Cu, 0.5-0.55%Mn, 0.05-0.25%Cd, 0.3-0.5%Ti, 3.5-5%Mg, the B trace, the C trace, the P trace, the REE trace, remainder is Al; Impurity F e content is not more than 0.15%, and total impurities is not more than each raw material of 0.40% weighing step 1); Use the electrical crucible melting, crucible heats up and is preheated to 460-480 ℃, adds pure Al, Al-Si, Al-Cu, Al-Mn, Al-Ti, Al-Mg and Cd successively, and preheating 1-2 hour, fusing then heated up
3) grain refining processing: in step 2) add Al-Ti-B-C and Cu-P composite crystal grain fining agent in the liquation of fusing, total add-on of fining agent is the 0.5-0.8% of liquation quality, and wherein Al-Ti-B-C accounts for 50-70%, and Cu-P accounts for 30-50%;
4) refining: molten metal stirs after melting fully, carries out refining treatment, adopts the Manganous chloride tetrahydrate refining agent, and refining temperature 720-750 ℃, refining time 10-12min leaves standstill more than the 10min after the refining;
5) the rotten processing: the processing of going bad after the refining, adopt Al-Re master alloy alterant, deterroration 720-730 ℃, deteriorating time 12-20min;
6) the sand mold mould use in cast, adjusts alloy liquid temp to 700 ℃, pours into a mould;
7) thermal treatment: use chamber type electric resistance furnace thermal treatment; Solution treatment: 530 ± 5 ℃ * 8-12h, hardening was controlled transfer time less than 15 seconds; Artificial aging is handled: 150 ± 5 ℃ * 5-6h → air cooling.
The beneficial effect of the inventive method is:
1. through the adjustment alloying constituent, reduce the consumption of Si, and in alloy, add Mg, make the intensity of alloy improve, make this alloy have good flowability, good casting property simultaneously.
Through add Al-Ti-B-C with the refinement of Cu-P composite crystal grain fining agent alloy grain, make the intensity raising of alloy.
3. through control melting rationally, refining, rotten, cast and process of thermal treatment parameter, make the excellent combination property of alloy.
Embodiment
Embodiment one
A kind of preparation method of y alloy y comprises the steps:
1) batching: raw material uses pure Al and Al-12wt%Si, Al-50wt%Cu, Al-10wt%Mn, Cd, Al-5wt%Ti and Al-10wt%Mg master alloy;
2) melting: according to target component 2.8%Si, 6%Cu, 0.5%Mn, 0.2%Cd, 0.4%Ti, 3.5%Mg, the B trace, the C trace, the P trace, remainder is Al; Impurity F e content is not more than 0.15%, and total impurities is not more than each raw material of 0.40% weighing step 1); Use the electrical crucible melting, crucible heats up and is preheated to 460 ℃, adds pure Al, Al-Si, Al-Cu, Al-Mn, Al-Ti, Al-Mg and Cd successively, preheating 1 hour, and fusing then heats up;
3) grain refining processing: in step 2) add Al-Ti-B-C and Cu-P composite crystal grain fining agent in the liquation of fusing, total add-on of fining agent is 0.5% of a liquation quality, and wherein Al-Ti-B-C accounts for 60%, and Cu-P accounts for 40%;
4) refining: molten metal stirs after melting fully, carries out refining treatment, adopts the Manganous chloride tetrahydrate refining agent, 720 ℃ of refining temperatures, and refining time 12min leaves standstill 12min after the refining;
5) the rotten processing: the processing of going bad after the refining, adopt Al-Re master alloy alterant, 730 ℃ of deterrorations, deteriorating time 15min;
6) the sand mold mould use in cast, adjusts alloy liquid temp to 700 ℃, pours into a mould;
7) thermal treatment: use chamber type electric resistance furnace thermal treatment; Solution treatment: 535 ℃ * 10h, hardening is controlled 12 seconds transfer time; Artificial aging is handled: 155 ℃ * 5h → air cooling.
Embodiment two
A kind of preparation method of y alloy y comprises the steps:
1) batching: raw material uses pure Al and Al-12wt%Si, Al-50wt%Cu, Al-10wt%Mn, Cd, Al-5wt%Ti and Al-10wt%Mg master alloy;
2) melting: according to target component 2.8%Si, 6%Cu, 0.5%Mn, 0.2%Cd, 0.4%Ti, 3.5%Mg, the B trace, the C trace, the P trace, remainder is Al; Impurity F e content is not more than 0.15%, and total impurities is not more than each raw material of 0.40% weighing step 1); Use the electrical crucible melting, crucible heats up and is preheated to 480 ℃, adds pure Al, Al-Si, Al-Cu, Al-Mn, Al-Ti, Al-Mg and Cd successively, preheating 2 hours, and fusing then heats up
3) grain refining processing: in step 2) add Al-Ti-B-C and Cu-P composite crystal grain fining agent in the liquation of fusing, total add-on of fining agent is 0.8% of a liquation quality, and wherein Al-Ti-B-C accounts for 70%, and Cu-P accounts for 30%;
4) refining: molten metal stirs after melting fully, carries out refining treatment, adopts the Manganous chloride tetrahydrate refining agent, 720 ℃ of refining temperatures, and refining time 10min leaves standstill 15min after the refining;
5) the rotten processing: the processing of going bad after the refining, adopt Al-Re master alloy alterant, 720 ℃ of deterrorations, deteriorating time 15min;
6) the sand mold mould use in cast, adjusts alloy liquid temp to 700 ℃, pours into a mould;
7) thermal treatment: use chamber type electric resistance furnace thermal treatment; Solution treatment: 525 ℃ * 12h, hardening is controlled 10 seconds transfer time; Artificial aging is handled: 150 ℃ * 6h → air cooling.
The foregoing description one and two prepared y alloy ys, through test, the sand mold casting sample reaches under the room temperature: σ b360-380MPa, δ 2.0-2.5%, HB 120-130HBW; Permanent mold casting sample: σ b370-390MPa, δ 2.3-2.8%, HB 130-140HBW.
Applicant's statement; The present invention explains detailed process equipment of the present invention and technical process through the foregoing description; But the present invention is not limited to above-mentioned detailed process equipment and technical process, does not mean that promptly the present invention must rely on above-mentioned detailed process equipment and technical process could be implemented.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (1)
1. the preparation method of a y alloy y is characterized in that, comprises the steps:
1) batching: raw material uses pure Al and Al-12wt%Si, Al-50wt%Cu, Al-10wt%Mn, Cd, Al-5wt%Ti and Al-10wt%Mg master alloy;
2) melting: according to target component 2.5-3.5%Si, 5.5-6.5%Cu, 0.5-0.55%Mn, 0.05-0.25%Cd, 0.3-0.5%Ti, 3.5-5%Mg, the B trace, the C trace, the P trace, the REE trace, remainder is Al; Impurity F e content is not more than 0.15%, and total impurities is not more than each raw material of 0.40% weighing step 1); Use the electrical crucible melting, crucible heats up and is preheated to 460-480 ℃, adds pure Al, Al-Si, Al-Cu, Al-Mn, Al-Ti, Al-Mg and Cd successively, and preheating 1-2 hour, fusing then heated up
3) grain refining processing: in step 2) add Al-Ti-B-C and Cu-P composite crystal grain fining agent in the liquation of fusing, total add-on of fining agent is the 0.5-0.8% of liquation quality, and wherein Al-Ti-B-C accounts for 50-70%, and Cu-P accounts for 30-50%;
4) refining: molten metal stirs after melting fully, carries out refining treatment, adopts the Manganous chloride tetrahydrate refining agent, and refining temperature 720-750 ℃, refining time 10-12min leaves standstill more than the 10min after the refining;
5) the rotten processing: the processing of going bad after the refining, adopt Al-Re master alloy alterant, deterroration 720-730 ℃, deteriorating time 12-20min;
6) the sand mold mould use in cast, adjusts alloy liquid temp to 700 ℃, pours into a mould;
7) thermal treatment: use chamber type electric resistance furnace thermal treatment; Solution treatment: 530 ± 5 ℃ * 8-12h, hardening was controlled transfer time less than 15 seconds; Artificial aging is handled: 150 ± 5 ℃ * 5-6h → air cooling.
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| CN201110306224.1A CN102367525B (en) | 2011-10-10 | 2011-10-10 | A kind of preparation method of Cast aluminium alloy gold |
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| CN201110306224.1A CN102367525B (en) | 2011-10-10 | 2011-10-10 | A kind of preparation method of Cast aluminium alloy gold |
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| CN102367525B CN102367525B (en) | 2016-06-29 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672147A (en) * | 2012-05-07 | 2012-09-19 | 上海交通大学 | Method for complexly refining aluminum alloy solidified structure by using current and crystal grain refining agent |
| CN102747244A (en) * | 2012-06-27 | 2012-10-24 | 贵州大学 | Method for compound modification refining of aluminum alloy cast structure |
| CN103131906A (en) * | 2012-12-11 | 2013-06-05 | 龙口市丛林铝材有限公司 | Manufacturing technique of compress-deformed aluminium alloy |
| CN104862538A (en) * | 2015-04-23 | 2015-08-26 | 贵阳华恒机械制造有限公司 | Carbon powder modified cast aluminum alloy and preparation method thereof |
| CN105950920A (en) * | 2016-05-17 | 2016-09-21 | 中国科学院金属研究所 | Aluminum base alloy soluble in water and aqueous medium environments and preparation method thereof |
| CN106591616A (en) * | 2016-12-20 | 2017-04-26 | 重庆顺博铝合金股份有限公司 | Secondary aluminum grain refinement process and secondary aluminum treatment process |
| CN107739920A (en) * | 2017-09-21 | 2018-02-27 | 东莞华晶粉末冶金有限公司 | Aluminum alloy materials, Al-alloy products and preparation method thereof |
| CN112375942A (en) * | 2020-10-26 | 2021-02-19 | 宁波德业粉末冶金有限公司 | Combined type intelligence bumper shock absorber piston |
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| CN1861820A (en) * | 2006-06-15 | 2006-11-15 | 河北工业大学 | Grain fining agent for casting aluminium alloy, preparation process and application thereof |
| CN101045970A (en) * | 2005-07-18 | 2007-10-03 | 西安工业大学 | High strength heat resistant aluminium alloy |
| CN102021384A (en) * | 2009-09-17 | 2011-04-20 | 贵州华科铝材料工程技术研究有限公司 | Ag-Cr-RE high-strength heat-resistant aluminium alloy material with C as modifier and preparation method thereof |
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| US4620886A (en) * | 1983-08-10 | 1986-11-04 | Suddeutsche Metallindustrie Gmbh & Co. Kg | Method of making aluminum rivets with high ductility retention |
| CN101045970A (en) * | 2005-07-18 | 2007-10-03 | 西安工业大学 | High strength heat resistant aluminium alloy |
| CN1861820A (en) * | 2006-06-15 | 2006-11-15 | 河北工业大学 | Grain fining agent for casting aluminium alloy, preparation process and application thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672147A (en) * | 2012-05-07 | 2012-09-19 | 上海交通大学 | Method for complexly refining aluminum alloy solidified structure by using current and crystal grain refining agent |
| CN102747244A (en) * | 2012-06-27 | 2012-10-24 | 贵州大学 | Method for compound modification refining of aluminum alloy cast structure |
| CN103131906A (en) * | 2012-12-11 | 2013-06-05 | 龙口市丛林铝材有限公司 | Manufacturing technique of compress-deformed aluminium alloy |
| CN104862538A (en) * | 2015-04-23 | 2015-08-26 | 贵阳华恒机械制造有限公司 | Carbon powder modified cast aluminum alloy and preparation method thereof |
| CN105950920A (en) * | 2016-05-17 | 2016-09-21 | 中国科学院金属研究所 | Aluminum base alloy soluble in water and aqueous medium environments and preparation method thereof |
| CN106591616A (en) * | 2016-12-20 | 2017-04-26 | 重庆顺博铝合金股份有限公司 | Secondary aluminum grain refinement process and secondary aluminum treatment process |
| CN106591616B (en) * | 2016-12-20 | 2018-01-12 | 重庆顺博铝合金股份有限公司 | A kind of secondary aluminium Grain Refinement and secondary aluminium handling process |
| CN107739920A (en) * | 2017-09-21 | 2018-02-27 | 东莞华晶粉末冶金有限公司 | Aluminum alloy materials, Al-alloy products and preparation method thereof |
| CN107739920B (en) * | 2017-09-21 | 2019-11-19 | 东莞华晶粉末冶金有限公司 | Aluminum alloy materials, Al-alloy products and preparation method thereof |
| CN112375942A (en) * | 2020-10-26 | 2021-02-19 | 宁波德业粉末冶金有限公司 | Combined type intelligence bumper shock absorber piston |
| CN112375942B (en) * | 2020-10-26 | 2022-02-22 | 宁波德业粉末冶金有限公司 | Combined type intelligence bumper shock absorber piston |
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| Publication number | Publication date |
|---|---|
| CN102367525B (en) | 2016-06-29 |
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