CN101698229B - Surface mixed and modified powder infiltration technology of magnesium diecast alloy - Google Patents
Surface mixed and modified powder infiltration technology of magnesium diecast alloy Download PDFInfo
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- CN101698229B CN101698229B CN2009102092878A CN200910209287A CN101698229B CN 101698229 B CN101698229 B CN 101698229B CN 2009102092878 A CN2009102092878 A CN 2009102092878A CN 200910209287 A CN200910209287 A CN 200910209287A CN 101698229 B CN101698229 B CN 101698229B
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Abstract
The invention relates to a novel surface modification technology of die cast magnesium alloy. Concentration gradient of surface layer alloy of the magnesium alloy is formed by an infiltration technology; the modified power mixture with different granularity specifications, such as SiC, Al302, Si, Sn, Cr, Al, Zn and Cu and the like, is simultaneously sprayed inside and on the surface of a closed die casting mold cavity evenly; and a surface modified layer is formed in the die casting forming process of the magnesium alloy. The modified layer comprises a sub-surface modified layer and a surface modified layer, and is distributed inwards in a gradient shape along the magnesium alloy surface. The surface modified alloying layer of the invention is continuous and compact, has favorable corrosion resistance and abrasive resistance, and the mechanical property of the casting surface is also improved; the modified alloying layer and the magnesium alloy matrix are metallurgical combination with high combination strength, and surface layer cracking or stripping is not easy to emerge. The modified technology is simple,features easily controlled parameters, environment protection, no pollution, no sticky mold and no injury on a mould, and can be widely used in industrial production.
Description
Technical field
The present invention relates to a kind of die-casting magnesium alloy surface modified process.
Background technology
Magnesium is as the lightest engineering metal material (density 1.8g/cm
3, be 2/3 of aluminium, steel 1/4); Have that light specific gravity, specific strength and specific stiffness are high, damping and amortization and machinability is good, thermal conductivity is good, the electromagnetic shielding ability strong and the character that is easy to a series of uniquenesses such as reclaiming; Can satisfy Aeronautics and Astronautics, Hyundai Motor industry to loss of weight, requirements of saving energy, and alternative engineering plastics make the housing and the structural member of electronic equipment, to satisfy light, thin, the miniaturization of product; Requirement such as high integration and environmental protection improves the using energy source benefit.But the difficult point that also exists at present the technical elements that awaits in a large number solving is restricting the further application of diecast magnesium alloy parts; This shows that mainly magnesium is a kind of very active metal; Solubility height and corrosion rate are fast in atmosphere (especially malaria), acidic materials and salt (especially chloride); And the corrosion product that forms is loose, poor stability, and this fatal shortcoming has seriously restricted the extensive use of magnesium alloy.
The method that present Magnesiumalloy surface modifying mainly adopts has technologies such as anodic oxidation, plating coating; Though these technologies can be slowed down the corrosion of magnesium alloy to some extent, but still there are many deficiencies, as having sharp interface between some anti-corrosion coating and the magnesium alloy substrate; Textura epidermoidea is loose porous; And contain organic matter more, easy of crack or peel off, some process procedure also can pollute environment etc.In view of there is limitation in existing process; Each side all actively is devoted to the frontier nature research of Magnesiumalloy surface modifying aspect at present, and like vapour deposition, differential arc oxidation, ion injection, Laser Surface Treatment etc., but above technology is still immature; Technology and cost embarrass enterprise to accept; Some technology also is in the exploratory stage, is difficult to satisfy actual requirement, can't be widely used in the commercial production.
Summary of the invention
The objective of the invention is to overcome the defective or the deficiency of present Magnesiumalloy surface modifying technology, provide a kind of through the process of infiltration technique to diecast magnesium alloy top layer and subsurface stratum zone modification.
Technical solution of the present invention is achieved in that
The present invention forms diecast magnesium alloy spare top layer and subsurface stratum alloy concentrations gradient distribution through infiltration technique; The modified powder mixture of different grain size, heterogeneity is sprayed directly on in the die casting die cavity of sealing by the nozzle that is opened in the mold cavity; Make its part be suspended in die cavity inside; Part is attached to mold cavity surface, in the liquid magnesium alloy cavity filling process, is suspended in the inner nano level modified powder of mold cavity at cast gas-liquid interface place, forward position because effects such as eddy current are involved in; In process of setting subsequently, can form inferior surface reforming layer at the solid liquid interface place; After liquid magnesium alloy touched the mold cavity surface, with the micron order modified powder reaction formation surface reforming layer on mold cavity surface, concrete steps were:
A) mixed and modified powder sparges in the mold cavity of sealing: adopt mixed and modified powder after automatic jet mode will atomize in nozzle sprays into the mold cavity of sealing equably; Said mixed and modified powder partly is suspended in die cavity inside, and part is attached to mold cavity surface; After spraying completion, nozzle is from movable sealing;
B) die casting and form the blending surface modified layer: under the die casting condition,, promptly obtain the blending surface modified layer with liquid state or semi-solid magnesium alloy casting forming.
Described mixed and modified powder is the mixture of nanoscale and micron order modified powder, and wherein the volume proportion of nanometer grade powder is not less than 30%.
Said nanoscale and micron order modified powder are SiC, Al
3O
2, among the Si, Sn, Cr, Al, Zn, Cu one or more.
In the said step a), nano level modified powder major part is suspended in mould inside, and micron-sized modified powder major part is attached to the mold cavity surface.
Described blending surface modified layer comprises inferior surface reforming layer and surface reforming layer; Described inferior surface reforming layer is that the nano level modified powder that in die cavity, suspends preferentially with the magnesium alloy flow of filling the type forward position a series of physics chemical action takes place; Comprise dissolve ooze, be involved in, mixing, diffusion, chemical reaction etc., thereby at the certain thickness alloy-layer of the subcutaneous formation of foundry goods; Said surface reforming layer is that the micron-sized modified powder of cavity surface and the magnesium liquid of cast(ing) surface are had an effect, thus the certain thickness alloy-layer that forms at cast(ing) surface; Said inferior surface reforming layer and surface reforming layer do not have the strict boundary of microcosmic.
Described inferior surface modification layer thickness and surface modification layer thickness can be adjusted according to demands of different, like the ratio that changes modified powder straying quatity, mixing, granularity, time of repose and die-casting technological parameter etc. in die cavity.
With the blending surface modified layer that comprises inferior surface reforming layer and surface reforming layer that this method obtained, with the magnesium alloy substrate metallurgical binding, bond strength is high, and composition and controllable thickness.Said inferior surface reforming layer can improve the mechanics of surface performance of die casting, and said surface reforming layer can obviously improve the decay resistance and the anti-wear performance of die casting.It is thus clear that said blending surface modified layer has fundamentally changed the Mg alloy surface physicochemical properties, also simplified the existing surface modification technology of magnesium alloy, realize green, environmental protection, CR production.
Compared with prior art, the present invention has following significant advantage:
1, the blending surface modified layer that obtains through this technology comprises surface reforming layer and inferior surface reforming layer, and is fine and close continuously, can obviously improve mechanics of surface performance, corrosion resistance and the wearability of diecast magnesium alloy spare (comprise have the complicated cavity person);
2, said blending surface modified layer and magnesium alloy substrate are metallurgical binding, and bond strength is high, are difficult for producing crack of surface layer or peeling off;
3, do not add any binding agent in the modified powder and directly spray in the closed die casting die cavity, modified powder is difficult for oxidation, not sticking to mould, mould is had no damage, environmental protection is pollution-free;
4, the composition of said blending surface modified layer and thickness can require adjustment according to reality; Especially for important part (particularly complicated cavity), said blending surface modified layer can be adjusted as requested flexibly;
5, technology of the present invention is simple, and parameter is easy to control, and yield rate is high, can be widely used in the commercial production.
The specific embodiment
Embodiment 1
Get SiC powder that granularity is about 100nm and the Al powder of 100 μ m mixed in 2: 3 by volume; Adopt automatic jet mode that mixed powder evenly is sprayed on mold cavity inside and the inner surface thereof; Said mixed and modified powder partly is suspended in die cavity inside; Part is attached to mold cavity surface, and coating layer thickness is about 0.4mm; Under the die casting condition, with liquid magnesium alloy pouring casting forming in metal mold, cooling promptly obtains the blending surface modified layer.
Embodiment 2
Get the SiC powder that granularity is about 100nm, Al powder and the Zn powder of 100 μ m mixed in 4: 3: 3 by volume; Adopt automatic jet mode that mixed powder evenly is sprayed on mold cavity inside and the inner surface thereof; Said mixed and modified powder partly is suspended in die cavity inside; Part is attached to mold cavity surface, and coating layer thickness is about 0.5mm; Under the die casting condition, with liquid magnesium alloy pouring casting forming in metal mold, cooling promptly obtains the blending surface modified layer.
Embodiment 3
Get SiC powder that granularity is about 50nm and the SiC powder of 50 μ m mixed in 2: 3 by volume; Adopt automatic jet mode that mixed powder evenly is sprayed on mold cavity inside and the inner surface thereof; Said mixed and modified powder partly is suspended in die cavity inside; Part is attached to mold cavity surface, and coating layer thickness is about 0.4mm; Under the die casting condition, with liquid magnesium alloy pouring casting forming in metal mold, cooling promptly gets the blending surface modified layer.
Embodiment 4
Get Al powder that granularity is about 50nm and the Al powder of 50 μ m mixed in 2: 3 by volume; Adopt automatic jet mode that mixed powder evenly is sprayed on mold cavity inside and the inner surface thereof; Said mixed and modified powder partly is suspended in die cavity inside; Part is attached to mold cavity surface, and coating layer thickness is about 0.4mm; Under the die casting condition, with liquid magnesium alloy pouring casting forming in metal mold, cooling promptly gets the blending surface modified layer.
Embodiment 5
Get granularity and be about the SiC powder of 100nm and the Al of 50 μ m
3O
2Powder mixed in 2: 3 by volume, adopted automatic jet mode that mixed powder evenly is sprayed on mold cavity inside and the inner surface thereof, and said mixed and modified powder partly is suspended in die cavity inside, and part is attached to mold cavity surface, and coating layer thickness is about 0.4mm; Under the die casting condition, with liquid magnesium alloy pouring casting forming in metal mold, cooling promptly gets the blending surface modified layer.
Embodiment 6
Get Al powder and the mixing in 1: 1 by volume of Zn powder that granularity is about 50 μ m, evenly be coated on die casting die cavity inner surface, coating layer thickness is about 0.4mm; Close and close dynamic model, cover half; Granularity is about the SiC powder of 100nm and Al powder that granularity is 50 μ m and Zn powder mixed by 4: 3: 3, adopt automatic jet mode evenly to be sprayed on mold cavity inside and the inner surface thereof, said mixed and modified powder partly is suspended in die cavity inside; Part is attached to mold cavity surface, and coating layer thickness is about 0.8mm; Under the die casting condition, with liquid magnesium alloy pouring casting forming in metal mold, cooling can form surface reforming layer.
Embodiment 7
Get Si powder that granularity is about 100nm and the Al powder of 50 μ m mixed in 2: 3 by volume; Adopt automatic jet mode that mixed powder evenly is sprayed on mold cavity inside and the inner surface thereof; Said mixed and modified powder partly is suspended in die cavity inside, and part is attached to mold cavity surface, and coating layer thickness is about 0.4mm; Under the die casting condition, the die casting cooling in metal mold of liquid magnesium alloy pouring can be formed surface reforming layer.
To above-mentioned instance made Mg alloy castings surface reforming layer and matrix alloy contrast, the result sees table 1 for details, and is visible, and through the blending surface modified layer of this programme processing gained Mg alloy castings, its corrosion resistance and wearability all have significantly raising.
The above; Be merely the preferable specific embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technical staff who is familiar with the present technique field is equal to replacement or change according to technical scheme of the present invention and inventive concept thereof in the technical scope that the present invention discloses, all should be encompassed within protection scope of the present invention.
Table 1 Mg alloy castings surface reforming layer and matrix alloy performance comparison
| Sequence number | Corrosion resisting property improves (doubly) | Anti-wear performance improves (doubly) |
| Embodiment 1 | 10.5 | 3.9 |
| Embodiment 2 | 12.7 | 4.2 |
| Embodiment 3 | 15.2 | 6.8 |
| Embodiment 4 | 4.7 | 2.5 |
| Embodiment 5 | 14.5 | 5.0 |
| Embodiment 6 | 15.6 | 5.2 |
| Embodiment 7 | 9.0 | 3.2 |
Claims (2)
1. a surface mixed and modified powder infiltration technology of magnesium diecast alloy comprises the steps:
A) mixed and modified powder sparges in the mold cavity of sealing: adopt mixed and modified powder after automatic jet mode will atomize in nozzle sprays into the mold cavity of sealing equably; Said mixed and modified powder partly is suspended in die cavity inside, and part is attached to mold cavity surface; After spraying completion, nozzle is from movable sealing;
Described mixed and modified powder is the mixture of nanoscale and micron order modified powder, and wherein the volume proportion of nanometer grade powder is not less than 30%;
Said nano level modified powder major part is suspended in mold cavity inside, and micron-sized modified powder major part is attached to the mold cavity surface;
B) die casting and form the blending surface modified layer: under the die casting condition,, promptly obtain the blending surface modified layer with liquid state or semi-solid magnesium alloy casting forming;
Described blending surface modified layer comprises inferior surface reforming layer and surface reforming layer; To be that the nano level modified powder that in die cavity, suspends is preferential with the magnesium alloy flow of filling the type forward position a series of physics chemical action take place described inferior surface reforming layer, thereby at the certain thickness alloy-layer of the subcutaneous formation of foundry goods; Said surface reforming layer is that the micron-sized modified powder of cavity surface and the magnesium liquid of cast(ing) surface are had an effect, thus the certain thickness alloy-layer that forms at cast(ing) surface; Said inferior surface reforming layer and surface reforming layer do not have the strict boundary of microcosmic.
2. surface mixed and modified powder infiltration technology of magnesium diecast alloy according to claim 1 is characterized in that: said nanoscale and micron order modified powder are SiC, Al
3O
2, among the Si, Sn, Cr, Al, Zn, Cu one or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102092878A CN101698229B (en) | 2008-11-10 | 2009-10-28 | Surface mixed and modified powder infiltration technology of magnesium diecast alloy |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102286991A CN101402136A (en) | 2008-11-10 | 2008-11-10 | Die-casting magnesium alloy surface modified powder infiltration process |
| CN200810228699.1 | 2008-11-10 | ||
| CN2009102092878A CN101698229B (en) | 2008-11-10 | 2009-10-28 | Surface mixed and modified powder infiltration technology of magnesium diecast alloy |
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| Publication Number | Publication Date |
|---|---|
| CN101698229A CN101698229A (en) | 2010-04-28 |
| CN101698229B true CN101698229B (en) | 2012-04-18 |
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| CN2009102092878A Expired - Fee Related CN101698229B (en) | 2008-11-10 | 2009-10-28 | Surface mixed and modified powder infiltration technology of magnesium diecast alloy |
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| CN102615270B (en) * | 2012-04-09 | 2014-11-05 | 昆明理工大学 | Method for compounding SiC particles on surface of base material |
| CN102632221B (en) * | 2012-04-28 | 2015-03-11 | 昆明理工大学 | Method for compounding SiC grains on surface of semisolid A356 aluminum alloy |
| CN102921923A (en) * | 2012-10-25 | 2013-02-13 | 江苏大学 | Method for preparing TiC+Al2O3 particle-reinforced steel-based surface-recombined excavator form-relieved tooth |
| CN105834403A (en) * | 2016-05-26 | 2016-08-10 | 镇江市经纬工程机械有限公司 | Casting method for dozer blade |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3286224B2 (en) * | 1997-10-01 | 2002-05-27 | 株式会社日本製鋼所 | Manufacturing method of magnesium molded product |
| CN1354055A (en) * | 2001-10-24 | 2002-06-19 | 西安交通大学 | Surface alloying process of magnesium alloy in course of solidification |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3286224B2 (en) * | 1997-10-01 | 2002-05-27 | 株式会社日本製鋼所 | Manufacturing method of magnesium molded product |
| CN1354055A (en) * | 2001-10-24 | 2002-06-19 | 西安交通大学 | Surface alloying process of magnesium alloy in course of solidification |
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