CN103726047A - Method for carrying out laser surface treatment by dip-coating and presetting powder - Google Patents
Method for carrying out laser surface treatment by dip-coating and presetting powder Download PDFInfo
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- CN103726047A CN103726047A CN201310729571.4A CN201310729571A CN103726047A CN 103726047 A CN103726047 A CN 103726047A CN 201310729571 A CN201310729571 A CN 201310729571A CN 103726047 A CN103726047 A CN 103726047A
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Abstract
The invention discloses a method for carrying out laser surface treatment by dip-coating and presetting powder. The method is characterized by comprising the following steps: (1) polishing and descaling a metal substrate, and wiping and unoiling by acetone; (2) mixing a saturated alcohol solution of shell-lac, powder of which the particle size is +0.5 to -150 microns and alcohol according to the mass ratio of (5-10):(20-70):(20-75), and evenly agitating; (3) soaking the metal substrate into a mixture, staying for 1-5 seconds, taking out and then naturally drying; (4) repeating the step (3) until the required powder thickness is formed on the surface of the metal substrate; and (5) adjusting the powder of a CO2 laser device to 2000-7000W, and carrying out laser surface scanning, wherein the laser beam width is 1-10nm, and the laser fusing speed is 100-5000mm/min. By adopting the method disclosed by the invention, a powder layer which is uniform in coating and convenient and controllable in thickness can be formed on the surface of the substrate conveniently, and a laser hardening layer is obtained by laser treatment.
Description
Technical field
The present invention relates to a kind of method of Laser Surface Treatment, is to adopt coating fore-put powder to carry out the method that laser surface hardening, alloying and cladding are processed at metal base surface specifically.
Background technology
Laser surface treating technology is that to take the laser beam of high-energy-density be thermal source, irradiate substrate surface and reach rapid melting state, when again cooling subsequently, form new phase structure, or form new alloy structure with the material composition (powder or silk material) of new interpolation, its feature is to form thinner surface-treated layer (0.1 ~ 2mm), processing layer is combined with matrix closely, form metallurgical binding, thinning ratio low (≤5%), be a kind of advanced person's process for treating surface, in engineering, be widely used.
Laser surface treating technology usually adopts powder as starting material, this is because powder kind is various, all material nearly all can be made powder and be used, comprising metal, alloy, pottery, sintering metal etc., or even the non-existent structured material of some occurring in natures, so how research joins by powdered material the critical process that laser molten pool just becomes laser surface treating technology.
Laser surface treating technology generally adopts the preset method of coaxial powder-feeding or surface to add powder, coaxial powder-feeding mode, because powder using efficiency is low, powder-feeding head complex structure is difficult to the factors such as long-time steady operation, is generally commonly used in the short period of time laser treatment of local surfaces; Surface is preset is, by certain technique, powder is placed in to matrix surface in advance, carry out again subsequently laser treatment, conventional technique have spraying, thermospray, plating/electroless plating, compressing tablet preset, push the methods such as preset, these methods in use have certain scope of application and limitation.
Be similar to method for paint spraying, spraying pre-setting method is that powder is scattered in organic solvent, utilize pressurized air ejection, after dry, form certain thickness powder bed, although it is convenient to implement, but be only confined to the powder that particle is less, during macrobead spraying, easily cause powder particle bounce-back, increase waste and environmental pollution, and easily there is the phenomenon of layering and scaling during for the spraying of thicker initialization layer, and spraying process determines by operator's experience, sprayed coating thickness is difficult for to achieve effective control, and the thickness of initialization layer is difficult to control evenly.
Thermospray pre-setting method is to adopt various heat spraying methods (as flame plating, plasma spraying, electric arc spraying, supersonic spray coating etc.), by the tectum of the cooling formation mechanical bond of material melts, the utilization ratio of material is lower than 50%, process costs is very high, and the kind of spray material is limited by the restriction of spraying method to material itself, therefore uses and be subject to certain restrictions.
Plating/chemical plating method be adopt plating/electroless plating by the metal/alloy composition in plating solution by chemical reaction deposit on matrix surface, generally deposition is metal or simple alloy, cost is also higher, in use procedure, is very restricted, and is only confined to the preset of thin layer and prime coat.
CN200710135477 has announced " with pressed disc method fore-put powder, carrying out the method that laser melting coating obtains coating ", it mainly adopts compression mold, on press device, powder is suppressed, powder slabbing or ring-type are pressed on need carry out on the substrate surface of coating processing, then be placed in laser process equipment and carry out lf, this method needs special press device, need to process the mould of dedicated shape, convenient for the shape matching of plane, for other shapes or erose workpiece, suitability is wideless.
CN201210097330 has announced " with extrusion process fore-put powder, carrying out the method that laser melting coating obtains compound coating ", it is uniformly mixed into pasty state or paste with the adhesive solution preparing by whiting powder material fusion, then with fashion of extrusion, be preset at substrate material surface, then carry out laser melting coating, the thickness of the restive extruded layer of this method, still need special-purpose extrusion equipment to carry out, for complicated part, have the problem that is difficult to apply.
Therefore develop a kind of powder using efficiency high, with low cost, be suitable for larger area, irregularly shaped, and can apply conveniently, evenly moulding, controlled powder pre-setting method and the Laser Surface Treatment technique of thickness just seem very necessary.
Summary of the invention
The object of the present invention is to provide that a kind of powder for Laser Surface Treatment is preset, the method for Laser Surface Treatment, can at matrix surface, form even coating easily, thickness facilitates controlled powder bed, through laser treatment, obtains Laser Strengthening Layer.
Technical scheme of the present invention is as follows: 1. metallic matrix eliminated rust by mechanical grinding, and acetone wiping oil removing; 2. by the alcoholization solution of shellac, granularity, be powder and the alcohol of+0.5 ~-150 μ m, according to mass ratio 5 ~ 10: mix at 20 ~ 70: 20 ~ 75, and stir; 3. metallic matrix is dipped in mixture, and stops 1 ~ 5 second, seasoning after taking out; 4. repeating step 3., until the powder thickness that metal base surface form to need; 5. by CO
2laser power is adjusted to 2000 ~ 7000W, and laser beam width is 1 ~ 10mm, and laser melting coating speed is 100 ~ 5000mm/min, carries out laser surface scanning.
Powder of the present invention can be the mixture of rule or irregularly shaped metal-powder, powdered alloy, ceramic powder or metal and ceramic powder.
Feature of the present invention is to utilize the surface tension of liquid, in dip-coating process, the mixture with powder particle is uniformly distributed in to matrix surface, the molding thickness that can control easily powder by powder particle, component proportion, immersion time and immersion number of times etc., convenient and practical, reliability is high.
Through laser quenching, laser alloying and laser melting coating test, this powder bed of inventing preset different thickness is applied to Laser Surface Treatment technique, even thickness, and it is convenient to implement, and has obtained not having defective Laser Strengthening Layer.
The method easy construction, with low cost, powder using efficiency is high, is suitable for larger area, powder irregularly shaped, workpiece in batch is preset.The combination of initialization layer and matrix is tightr, after Laser Surface Treatment, can form the strengthening region of being rich in initialization layer alloying element, strengthening layer does not have the defects such as crackle, pore, strong with basal body binding force, form metallurgical binding, do not changing under the condition of matrix fundamental property, give surface special performance, as wear-resisting, thermal crack resistant, the characteristic such as high temperature resistant.
Accompanying drawing explanation
Fig. 1 is the Laser Strengthening Layer structural representation of embodiment 3.
In figure: 1. laser cladding layer 2. matrixes.
Embodiment
Embodiment 1
Take respectively the alcoholization solution of 5 grams of shellac, the SiO of 30 gram of 1 μ m
2powder, 65 grams of alcohol mix in beaker, and 50 * 50 * 10mm steel plate sample is immersed to beaker, keep for 1 second, take out after horizontal seasoning, and thickness is 0.05mm, repeats twice, and powder total thickness is 0.10mm.
CO
2laser power is 3500W, and laser beam width is 2.0mm, and laser melting coating speed is 3000mm/min, overlapping rate 10%.
Embodiment 2
Take respectively the alcoholization solution of 7 grams of shellac, the Cr powder of 40 grams of-10 μ m, 53 grams of industrial spirit mix in beaker, 50 * 50 * 10mm steel plate sample is immersed to beaker, kept for 3 seconds, take out after horizontal seasoning, thickness is 0.1mm, and in triplicate, powder total thickness is 0.30mm.CO
2laser power is 5000W, and laser beam width is 10.0mm, and laser melting coating speed is 1000mm/min, overlapping rate 20%
Embodiment 3
Take respectively the alcoholization solution of 10 grams of shellac, the Fe35 powder of 70 grams of-150 μ m, 20 grams of industrial spirit, in beaker, mix, 50 * 50 * 10mm steel plate sample is immersed to beaker, kept for 5 seconds, take out after horizontal seasoning, thickness is 0.2mm, and in triplicate, powder total thickness is 0.60mm.CO
2laser power is 5000W, and laser beam width is 5.0mm, and laser melting coating speed is 500mm/min, overlapping rate 30%.
Claims (2)
1. adopt dip-coating fore-put powder to carry out a method for Laser Surface Treatment, it is characterized in that step is as follows: 1. metallic matrix is eliminated rust by mechanical grinding, acetone wiping oil removing; 2. by the alcoholization solution of shellac, granularity, be powder and the alcohol of+0.5 ~-150 μ m, according to mass ratio 5 ~ 10: mix at 20 ~ 70: 20 ~ 75, and stir; 3. metallic matrix is dipped in mixture, and stops 1 ~ 5 second, seasoning after taking out; 4. repeating step 3., until the powder thickness that metal base surface form to need; 5. by CO
2laser power is adjusted to 2000 ~ 7000W, and laser beam width is 1 ~ 10mm, and laser melting coating speed is 100 ~ 5000mm/min, carries out laser surface scanning.
2. the method for Laser Surface Treatment according to claim 1, is characterized in that mixing of rule or erose metal-powder, powdered alloy, ceramic powder or metal and ceramic powder.
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| CN201310729571.4A CN103726047A (en) | 2013-12-26 | 2013-12-26 | Method for carrying out laser surface treatment by dip-coating and presetting powder |
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| CN201310729571.4A CN103726047A (en) | 2013-12-26 | 2013-12-26 | Method for carrying out laser surface treatment by dip-coating and presetting powder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106868500A (en) * | 2017-03-02 | 2017-06-20 | 重庆理工大学 | A kind of surface alloying coating, preparation method and mould electron beam alloyage method |
| CN106868501A (en) * | 2017-03-02 | 2017-06-20 | 重庆理工大学 | A kind of surface alloying coating, preparation method and die surface processing method |
| CN106868502A (en) * | 2017-03-02 | 2017-06-20 | 重庆理工大学 | Hot-work die laser alloying coating and preparation method and laser alloying method |
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| CN101041750A (en) * | 2006-03-22 | 2007-09-26 | 通用电气公司 | Method for preparing strain tolerant coatings by a sol-gel process |
| CN101200801A (en) * | 2007-12-18 | 2008-06-18 | 中南大学 | Niobic alloy high temperature antioxidation silicide coating and preparation method thereof |
| CN102389588A (en) * | 2011-11-07 | 2012-03-28 | 郑州大学 | Magnesium or magnesium alloy material used for biological implantation and preparation method thereof |
| CN102586548A (en) * | 2012-03-16 | 2012-07-18 | 广州有色金属研究院 | Laser strengthening method for casting roller of aluminum casting rolling mill |
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2013
- 2013-12-26 CN CN201310729571.4A patent/CN103726047A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101041750A (en) * | 2006-03-22 | 2007-09-26 | 通用电气公司 | Method for preparing strain tolerant coatings by a sol-gel process |
| CN101200801A (en) * | 2007-12-18 | 2008-06-18 | 中南大学 | Niobic alloy high temperature antioxidation silicide coating and preparation method thereof |
| CN102389588A (en) * | 2011-11-07 | 2012-03-28 | 郑州大学 | Magnesium or magnesium alloy material used for biological implantation and preparation method thereof |
| CN102586548A (en) * | 2012-03-16 | 2012-07-18 | 广州有色金属研究院 | Laser strengthening method for casting roller of aluminum casting rolling mill |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106868500A (en) * | 2017-03-02 | 2017-06-20 | 重庆理工大学 | A kind of surface alloying coating, preparation method and mould electron beam alloyage method |
| CN106868501A (en) * | 2017-03-02 | 2017-06-20 | 重庆理工大学 | A kind of surface alloying coating, preparation method and die surface processing method |
| CN106868502A (en) * | 2017-03-02 | 2017-06-20 | 重庆理工大学 | Hot-work die laser alloying coating and preparation method and laser alloying method |
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Application publication date: 20140416 |