CN102703894A - Compound strengthening method for surface laser deposition of magnesium alloy - Google Patents
Compound strengthening method for surface laser deposition of magnesium alloy Download PDFInfo
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- CN102703894A CN102703894A CN2012102243634A CN201210224363A CN102703894A CN 102703894 A CN102703894 A CN 102703894A CN 2012102243634 A CN2012102243634 A CN 2012102243634A CN 201210224363 A CN201210224363 A CN 201210224363A CN 102703894 A CN102703894 A CN 102703894A
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Abstract
A compound strengthening method for surface laser deposition of a magnesium alloy comprises the following steps of: 1) performing pretreatment on the surface of a substrate, performing coarsening treatment on the substrate, and removing oxides and rust stains on the surface so that the substrate is easy to firmly bond with a coating layer; 2) cleaning the surface of the coarsened substrate by using an organic solvent such as acetone, and then drying the surface by a blower or naturally air-drying; 3) putting SiC powder and 316L powder which respectively have certain granularityn into a mixer in a certain ratio and throughly mixing; and performing scanning radiation on mixed SiC-316L powder by a laser with appropriate technological parameters under protection of argon or helium, wherein the powder is close to a focal point and the laser irradiates on the powder; and the substrate is far away from the focal point. The compound strengthening method for the surface laser deposition of the magnesium alloy is environment-friendly and economical, and capable of obviously improving the corrosion resistance, the hardness and the abrasive resistance of the magnesium alloy.
Description
Technical field
The present invention relates to a kind of method of Mg alloy surface laser deposition complex intensifying.
Background technology
Magnesiumalloy is that all structures are minimum with density in the alloy; With other alloy phase ratios, it has specific tenacity, specific rigidity is high, and thermal conductivity is good; Good damping shock absorption property is arranged; Stronger anti-electromagnetic interference capability and good machinability such as can utilize again at advantage, are described as " the green engineering material of 21st century ".At present, magnesiumalloy has been widely used in aspects such as electronic equipment, transport facility, aerospace and military affairs.But the chemicalstability of magnesium is low, and electropotential is very low, and the wear-resisting and erosion resistance of magnesiumalloy is relatively poor, is seriously restricting the performance of its material potentiality for a long time.Stainless steel has good anti-corrosion; The coating that often is used as corrosion susceptible materials; But stainless wear resistance is relatively poor; Hard ceramic particles has characteristics such as HS, high firmness, HMP, and its adding can make stainless steel coating have excellent properties such as good anti-corrosion and wear resistance simultaneously, has boundless utilization prospect.And one of technologies for Laser Surface Modification Treatment that laser surface hardening technology is a magnesiumalloy mainly to be adopted, characteristics such as it has the laser energy density height, and the heat affected zone is little, and heat effect and thermal distortion are little.Utilization laser reinforcing technology can improve hardness, wear resistance, thermotolerance, erosion resistance and the fatigue resistence etc. of material surface, thus the work-ing life of improving workpiece.Adopt ceramic enhanced granule and laser reinforcing compounding technology, can improve erosion resistance, hardness and the wear resistance of magnesiumalloy to a greater degree.
Summary of the invention
The object of the present invention is to provide a kind of method of Mg alloy surface laser deposition complex intensifying, it has the advantage that improves corrosion resistance of magnesium alloy, hardness and wear resistance.
The present invention realizes like this; A kind of method of Mg alloy surface laser deposition complex intensifying; It is characterized in that, said method comprising the steps of: 1) substrate surface is carried out pre-treatment, mainly comprise substrate is carried out roughening treatment; Remove the oxide compound and rust stain on surface, make substrate form firm combining with coating easily; 2) substrate after the alligatoring is used the organic solvent clean surface, then with drier or natural air drying; 3) SiC and the 316L powder of certain particle size size are put into thorough mixing in the mixer by a certain percentage; Then with the SiC-316L powder that mixes under the protection of argon gas or helium; Use laser apparatus under suitable processing parameter, to carry out scanning and irradiation; Powder gets into laser near focus, and substrate forms the SiC-316L compound coating away from focus; Said SiC particulate globule size is 400～800 orders, and the granularity of 316L powder of stainless steel is 200～500 orders, and the quality proportioning of SiC, 316L is 1:1～1:10, and powder gets into laser near focus, and substrate is away from focus, and the substrate defocusing amount is 5～60mm; Use the protection of argon gas or helium atmosphere, the laser power of said laser apparatus: 1500W～3000W, sweep velocity: 400mm/min～1500 mm/min, spot diameter: 2mm～4mm, the substrate defocusing amount is 5～60mm; Said organic solvent is acetone or alcohol.
Technique effect of the present invention is: 1, adopt the coating and the matrix metallurgical binding of this technology preparation, and very firm, incrust; The smooth densification of coatingsurface; 2, laser is a kind of clean energy, and environment is not polluted; Laser energy and sweep velocity can accurately be controlled, and simple, the green clean environment firendly of preparation technology is beneficial to the realization industrial production automation; 3, the Mg alloy surface that adopts this technology to strengthen has not only improved its erosion resistance, and its hardness improved 2 times, and wear resistance has improved 1 times.
Description of drawings
Fig. 1 is the figure of laser deposition compound coating tissue topography of instance 1 of the present invention.
Fig. 2 is the figure of laser deposition compound coating tissue topography of instance 2 of the present invention.
Fig. 3 is the figure of laser deposition compound coating tissue topography of instance 3 of the present invention.
Fig. 4 is the coating XRD analysis collection of illustrative plates of instance 1 of the present invention.
Fig. 5 is the compound coating hardness linear graph of instance of the present invention 1, instance 2, instance 3 and instance 4 preparations.
Fig. 6 is the compound coating relative wear resistance linear graph of instance of the present invention 1, instance 2, instance 3 and instance 4 preparations.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is done further elaboration.
Embodiment 1
At first sandblasting is carried out on the surface of substrate AZ31 magnesiumalloy, removed the rusty scale and the oxide compound on surface, obtained the bigger surface of surfaceness with sandblast machine; With the AZ31 used for magnesium alloy acetone soln clean surface after the alligatoring, there is not greasy dirt etc. to cleaning surfaces; Natural air drying is subsequent use then; 600 purpose SiC powder and 300 purpose 316L Stainless Steel Powders are put into mixer mixing 3h with the ratio of 1:9, make the SiC powder become the SiC-316L composite powder, the AZ31 magnesiumalloy is placed on the worktable of laser apparatus with 316L Stainless Steel Powder thorough mixing uniform preparation; Adopt laser to carry out irradiation scanning powder and substrate; The processing parameter of laser is: laser power is 2200W, and sweep velocity is 1200mm/min, and spot diameter is 2mm; The substrate defocusing amount is 5mm; The tissue topography of formation SiC-316L compound coating and correlation parameter are referring to accompanying drawing 1, Fig. 4, Fig. 5 and Fig. 6.
Embodiment 2
At first sandblasting is carried out on the surface of substrate AZ31 magnesiumalloy, removed the rusty scale and the oxide compound on surface, obtained the bigger surface of surfaceness with sandblast machine; With the AZ31 used for magnesium alloy acetone soln clean surface after the alligatoring, there is not greasy dirt etc. to cleaning surfaces; Natural air drying is subsequent use then.600 purpose SiC powder and 300 purpose 316L Stainless Steel Powders are put into mixer mixing 3h with the ratio of 1:9, make the SiC powder become the SiC-316L composite powder with 316L Stainless Steel Powder thorough mixing uniform preparation.The AZ31 magnesiumalloy is placed on the worktable of laser apparatus, adopts laser to carry out irradiation scanning powder and substrate, the processing parameter of laser is: laser power is 1900W, and sweep velocity is 1200mm/min, and spot diameter is 2mm, and the substrate defocusing amount is 5mm;
The tissue topography of formation SiC-316L compound coating and correlation parameter are referring to accompanying drawing 2, Fig. 5 and Fig. 6.
Embodiment 3
At first sandblasting is carried out on the surface of substrate AZ31 magnesiumalloy, removed the rusty scale and the oxide compound on surface, obtained the bigger surface of surfaceness with sandblast machine; With the AZ31 used for magnesium alloy acetone soln clean surface after the alligatoring, there is not greasy dirt etc. to cleaning surfaces; Natural air drying is subsequent use then.600 purpose SiC powder and 300 purpose 316L Stainless Steel Powders are put into mixer mixing 3h with the ratio of 1:9, make the SiC powder become the SiC-316L composite powder with 316L Stainless Steel Powder thorough mixing uniform preparation.The AZ31 magnesiumalloy is placed on the worktable of laser apparatus, adopts laser to carry out irradiation scanning powder and substrate, the processing parameter of laser is: laser power is 2500W, and sweep velocity is 1200mm/min, and spot diameter is 2mm, and the substrate defocusing amount is 5mm; The tissue topography of formation SiC-316L compound coating and correlation parameter are referring to accompanying drawing 3, Fig. 5 and Fig. 6.
Embodiment 4
At first sandblasting is carried out on the surface of substrate AZ31 magnesiumalloy, removed the rusty scale and the oxide compound on surface, obtained the bigger surface of surfaceness with sandblast machine; With the AZ31 used for magnesium alloy acetone soln clean surface after the alligatoring, there is not greasy dirt etc. to cleaning surfaces; Natural air drying is subsequent use then.600 purpose SiC powder and 300 purpose 316L Stainless Steel Powders are put into mixer mixing 3h with the ratio of 1:9, make the SiC powder become the SiC-316L composite powder with 316L Stainless Steel Powder thorough mixing uniform preparation.The AZ31 magnesiumalloy is placed on the worktable of laser apparatus, adopts laser to carry out irradiation scanning powder and substrate, the processing parameter of laser is: laser power is 2800W, and sweep velocity is 1200mm/min, and spot diameter is 2mm, and the substrate defocusing amount is 5mm; The correlation parameter that forms the SiC-316L compound coating is referring to Fig. 5 and Fig. 6.
In sum: Fig. 1,2,3 is respectively the microtexture of the compound coating that instance 1, instance 2 and instance 3 prepare, and as can be seen from the figure coatingsurface is smooth and do not have macrocrack, gas hole defect, and coated grains is evenly tiny, compound good coating characteristic.
Fig. 4 is the XRD variation diagram of the compound coating of instance 1 preparation, mainly has responseless original phase Mg, Fe and SiC etc. in this coating, oxide M gO and SiO
2Fusing and rapid solidification are the molten principal features of annotating of laser fast; 316L powder of stainless steel in the coating and SiC powder are shorter through the laser region time; Molten notes powder id reaction probability is less; And the convection current that the Mg element in the magnesium alloy substrate produces owing to laser irradiation is diffused into the top in molten bath, mixes with coated powder.So have many Mg, Fe and SiC in being coated with mutually.
Fig. 5 is the hardness profile of the compound coating of instance 1, instance 2, instance 3, instance 4 acquisitions, and as can be seen from the figure the coating hardness of preparation increases substantially, and the coating hardness mxm. has reached 150HV, is about 4 times of baseplate material.
Fig. 6 is the relative wear resistance graphic representation of the compound coating of examples Example 1, instance 2, instance 3, instance 4 acquisitions, and as can be seen from the figure the coating relative wear resistance of preparation obtains corresponding raising, and maximum hardness is about 2 times of baseplate material.
In a word, the magnesiumalloy by the inventive method is strengthened on the basis of common laser surface strengthening, has added powder of stainless steel and ceramic phase particles, has improved corrosion resistance nature, hardness and the wear resistance of material surface simultaneously.And should simple, the green clean environment firendly of technology production technique, be beneficial to the realization industrial production automation, the alloy property that makes is excellent, and long service life has good economic outlook.
Claims (4)
1. the method for a Mg alloy surface laser deposition complex intensifying; It is characterized in that, said method comprising the steps of: 1) substrate surface is carried out pre-treatment, mainly comprise substrate is carried out roughening treatment; Remove the oxide compound and rust stain on surface, make substrate form firm combining with coating easily; 2) substrate after the alligatoring is used the organic solvent clean surface, then with drier or natural air drying; 3) SiC and the 316L powder of certain particle size size are put into thorough mixing in the mixer by a certain percentage; Then with the SiC-316L powder that mixes under the protection of argon gas or helium; Use laser apparatus under suitable processing parameter, to carry out scanning and irradiation; Powder gets into laser near focus, and substrate forms the SiC-316L compound coating away from focus.
2. the method for a kind of Mg alloy surface laser deposition complex intensifying as claimed in claim 1; It is characterized in that said SiC particulate globule size is 400～800 orders, the granularity of 316L powder of stainless steel is 200～500 orders; The quality proportioning of SiC, 316L is 1:1～1:10; Powder gets into laser near focus, and substrate is away from focus, and the substrate defocusing amount is 5～60mm.
3. the method for a kind of Mg alloy surface laser deposition complex intensifying as claimed in claim 1; It is characterized in that; Use the protection of argon gas or helium atmosphere, the laser power of said laser apparatus: 1500W～3000W, sweep velocity: 400mm/min～1500 mm/min; Spot diameter: 2mm～4mm, the substrate defocusing amount is 5～60mm.
4. the method for a kind of Mg alloy surface laser deposition complex intensifying as claimed in claim 1 is characterized in that, said organic solvent is acetone or alcohol.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106835112A (en) * | 2016-12-16 | 2017-06-13 | 中国兵器科学研究院宁波分院 | A kind of preparation method of the stainless steel composite coating of Mg alloy surface cold spraying 420 |
| CN108588566A (en) * | 2018-06-20 | 2018-09-28 | 华东交通大学 | A kind of FexWyC-Bainite ingredients and tissue double gradient composite material |
| CN109652618A (en) * | 2018-12-19 | 2019-04-19 | 中钢集团邢台机械轧辊有限公司 | A kind of laser surface intensified method |
| CN113634764A (en) * | 2021-07-26 | 2021-11-12 | 太原理工大学 | Method for manufacturing stainless steel-based composite coating on surface of magnesium alloy through laser additive manufacturing |
| CN114888440A (en) * | 2022-06-22 | 2022-08-12 | 济南大学 | Method for converting heat-absorbing coating in situ |
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| CN101532134A (en) * | 2009-04-24 | 2009-09-16 | 太原理工大学 | Method for enhancing surface of magnesium aluminium alloy by laser remelting |
| US20100080918A1 (en) * | 2008-09-30 | 2010-04-01 | Shih-Ying Chang | Surface treatment method for magnesium alloy |
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| US20100080918A1 (en) * | 2008-09-30 | 2010-04-01 | Shih-Ying Chang | Surface treatment method for magnesium alloy |
| CN101532134A (en) * | 2009-04-24 | 2009-09-16 | 太原理工大学 | Method for enhancing surface of magnesium aluminium alloy by laser remelting |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106835112A (en) * | 2016-12-16 | 2017-06-13 | 中国兵器科学研究院宁波分院 | A kind of preparation method of the stainless steel composite coating of Mg alloy surface cold spraying 420 |
| CN108588566A (en) * | 2018-06-20 | 2018-09-28 | 华东交通大学 | A kind of FexWyC-Bainite ingredients and tissue double gradient composite material |
| CN109652618A (en) * | 2018-12-19 | 2019-04-19 | 中钢集团邢台机械轧辊有限公司 | A kind of laser surface intensified method |
| CN113634764A (en) * | 2021-07-26 | 2021-11-12 | 太原理工大学 | Method for manufacturing stainless steel-based composite coating on surface of magnesium alloy through laser additive manufacturing |
| CN114888440A (en) * | 2022-06-22 | 2022-08-12 | 济南大学 | Method for converting heat-absorbing coating in situ |
| CN114888440B (en) * | 2022-06-22 | 2024-05-07 | 济南大学 | Method for in-situ conversion of heat absorption coating |
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Application publication date: 20121003 |