CN106868501B - A kind of surface alloying coating, preparation method and die surface processing method - Google Patents
A kind of surface alloying coating, preparation method and die surface processing method Download PDFInfo
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- 239000011248 coating agent Substances 0.000 title claims abstract description 62
- 238000000576 coating method Methods 0.000 title claims abstract description 62
- 238000005275 alloying Methods 0.000 title claims abstract description 47
- 238000003672 processing method Methods 0.000 title claims abstract description 12
- 238000002360 preparation method Methods 0.000 title abstract description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 51
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000956 alloy Substances 0.000 claims abstract description 27
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 26
- 229920001800 Shellac Polymers 0.000 claims abstract description 22
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 claims abstract description 22
- 239000004208 shellac Substances 0.000 claims abstract description 22
- 229940113147 shellac Drugs 0.000 claims abstract description 22
- 235000013874 shellac Nutrition 0.000 claims abstract description 22
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 22
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 21
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 21
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 21
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 21
- 239000000440 bentonite Substances 0.000 claims abstract description 20
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 20
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229960000935 dehydrated alcohol Drugs 0.000 claims abstract description 19
- 229960004756 ethanol Drugs 0.000 claims abstract description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 10
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 229910052786 argon Inorganic materials 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000012298 atmosphere Substances 0.000 claims description 8
- 238000007596 consolidation process Methods 0.000 claims description 4
- 239000012300 argon atmosphere Substances 0.000 claims description 2
- 239000002689 soil Substances 0.000 claims 1
- 230000008961 swelling Effects 0.000 claims 1
- 208000037656 Respiratory Sounds Diseases 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 13
- 235000019441 ethanol Nutrition 0.000 description 10
- 239000010410 layer Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005253 cladding Methods 0.000 description 3
- 238000010309 melting process Methods 0.000 description 3
- 239000011812 mixed powder Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005255 carburizing Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000287828 Gallus gallus Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0005—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with at least one oxide and at least one of carbides, nitrides, borides or silicides as the main non-metallic constituents
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses a kind of surface alloying coating, preparation method and die surface processing methods.The surface alloying coating includes the raw material of following mass parts: SiO220 ~ 30 parts, 20 ~ 25 parts of WC, 20 ~ 25 parts of Nb, 20 ~ 25 parts of Mo, 20 ~ 25 parts of Hf, 20 ~ 25 parts of Al, Si ~ 20-25 parts, 20 ~ 25 parts of Be, 15 ~ 25 parts of bentonite, 6 ~ 10 parts of shellac, 300 ~ 400 parts of dehydrated alcohol.Can effectively avoid stomata, be mingled with, crackle the defects of generation.Preparation method is by SiO2, WC, Nb, Mo, Hf, Al, Si, Be and bentonite be crushed to granularity respectively less than 3 microns, then it is uniformly mixed and obtains alloy powder, by the shellac ethanol solution of a part of dehydrated alcohol melt into shellac, finally alloy powder, the ethanol solution of shellac and another part dehydrated alcohol are stirred evenly with blender.Die surface processing method is that mold is placed in certain time in above-mentioned laser alloy coating, then takes out mold, and carry out remelting with laser in logical argon and the laser alloying of die surface can be completed.
Description
Technical field
The invention belongs to material surface processing and reinforcement technique fields, and in particular to a kind of surface alloying coating, preparation method
With die surface processing method.
Background technique
Hot-work die bears varying stress and impact force at high temperature, and workpiece shaping temperature often at 1000 DEG C or more, is also wanted
It is subjected to high-temperature oxydation, scaling loss and is subjected to high wind-warm syndrome caused by cold and hot variation under strong water cooling condition.It is needed when being on active service
Bear high stress, thermal shock, defibrator process undermine the effects of the load such as corrosion, therefore die life is very low.To improve the service life, adopt at present
Main method is surface peening.Conventional method has quenching, carburizing, nitriding etc., but the effect of these methods is very limited, because
It is hot-work die work in hot environment, traditional quenching enters annealed condition again under high temperature environment.In addition, for carburizing
For this technique, penetrating into excessive carbon can be such that the toughness of hot-work die reduces.
Using the method for laser alloying, can be formed on the surface of hot die steel has good metallurgical bonding with matrix
Alloying layer, and obtain wear-resisting, high temperature resistant, impact-resistant hot forged mould alloying layer under suitable parameter, make hot-forging die
The service life of tool greatly improves.
Although the model of hot die steel, ingredient are more on the market, the alloy powder for mold laser alloying is few
It is again few.The reason is that the particularity of laser alloying, especially needs to consider its High-temperature-resandant andant wear-resistant, the reasonable transition with matrix
And be suitable for laser alloying characteristic requirements etc., conventional alloying component proportion is used in laser alloying or has stomata, folder
The defects of miscellaneous, crackle or service performance cannot be met the requirements.
Summary of the invention
In view of the above shortcomings of the prior art, the present invention provides a kind of surface alloying coating, to solve existing alloy
Ingredient have stomata, be mingled with, crackle the defects of the technical issues of, and it is corresponding preparation method is provided, while providing and utilizing the alloy
Change coating and carry out die surface processing method, hot-work die service life that the prior art is surface-treated is short to ask to solve
Topic.
To achieve the goals above, The technical solution adopted by the invention is as follows:
A kind of alloy coating, the raw material including following mass parts: SiO220 ~ 30 parts, 20 ~ 25 parts of WC, Nb 20 ~ 25
Part, 20 ~ 25 parts of Mo, 20 ~ 25 parts of Hf, 20 ~ 25 parts of Al, 20 ~ 25 parts of Si, 20 ~ 25 parts of Be, 15 ~ 25 parts of bentonite, worm
6 ~ 10 parts of glue, 300 ~ 400 parts of dehydrated alcohol.
SiO2Effect in coating: auxiliary rheological agents in the construction process, since the solvent volatilization of coating edge is very fast, are led
It causes surface tension uneven, is easy to make coating to edge movement, and network of silica can effectively prevent the movement of coating
And webbing is formed, while also preventing the sagging phenomenon of coating in the curing process, make coating uniform.2, anti-settling agent, SiO2It is one
The ideal anti-settling agent of kind, for preventing the precipitating of pigment in coating system highly effective, especially for the system of mill base, suitably
Additive amount will greatly improve the stability of mill base, and the amount of wetting dispersing agent can be reduced, to improve the applicability of mill base,
And reduce influence of the mill base to coating system, SiO2Anti-settling effect to coating store highly beneficial, especially certain pigment,
Such as metal powder, all easily precipitates and cannot suspend completely, use SiO2It can guarantee that its dispersion does not precipitate.3, auxiliary agent is dispersed in powder
In last coating system, due to SiO2Small particle and high surface energy, they can be adsorbed on the surface of fine paint powders, and in powder
Surface formed a surface layer, improve powder obtain it is dispersed, therefore can be used as dispersing agent using in same coating system, be added
SiO2It can be obviously shortened jitter time, it is mono- it is noted that first by SiO to improve production efficiency2Disperse complete effect more preferably may be used
It is used together with other rheology host auxiliary agents of arranging in pairs or groups simultaneously, and adjusts SiO using alcohols solvent2Rheological property.4,SiO2May be used also
To improve weatherability, the resistance to marring of coating, the bond strength between coating and substrate is improved.
WC is ceramic phase, improves coating hardness.Type, content and the matching with metal wetability of ceramic phase, are all bases
It is obtained in many experiments.
Nb, Mo, Hf, Al, Si, Be are prepared into alloy powder together, collectively form high-entropy alloy.High-entropy alloy includes heat
" the chicken tail in the distortion of lattice effect in high entropy effect, structure, sluggish diffusion effect kinetically, performance on mechanics
Wine " effect.Using these characteristics, and binding isotherm calculates the high-entropy alloy designed with many experiments and WC with preferable phase
Capacitive can refine coating structure after laser beam irradiation, enhance toughness, the alloy-layer of formation is without empty crackle, alloy-layer and base
Body metallurgical bonding, bond strength are high.With WC collective effect, can improve high temperature abrasion resistance, impact resistance, hot-cracking resistance, to mentioning
High die life.
Wherein, the SiO2, WC, Nb, Mo, Hf, Al, Si, Be and bentonite be powder and granularity less than 3 microns.
A kind of preparation method of above-mentioned surface alloying coating, comprising the following steps:
1) by SiO2, WC, Nb, Mo, Hf, Al, Si, Be and bentonite be crushed to granularity respectively less than 3 microns, then mix
It closes uniformly, obtains alloy powder, it is spare.Micron powder can farthest avoid existing alloying component stomata,
Be mingled with, crackle the defects of generation.
2) a part of dehydrated alcohol of shellac is dissolved, obtains the ethanol solution of shellac, it is spare.Shellac can provide coating
Caking property, but uniform coating is formed, since commercially available shellac is solid, it is necessary to solution first be made and just advantageously form
The coating of suspended liquid status, and why using dehydrated alcohol make solvent, then it is the solubility due to shellac in dehydrated alcohol
It is higher, at the same dehydrated alcohol be easy to volatilize and it is substantially harmless to human body.
3) alloy powder, the ethanol solution of shellac and another part dehydrated alcohol are stirred evenly with blender to get arriving
Surface alloying coating.
A kind of die surface processing method, this method are that mold is placed in certain time in above-mentioned laser alloy coating, so
After take out mold, and remelting is carried out to the die surface with laser in protection gas atmosphere, die surface is made to form conjunction
Aurification coating completes the laser alloying of die surface.Specifically includes the following steps:
(1) mold is first heated to 70 ~ 110 DEG C, then the mold is immersed in 1 ~ 3s in laser alloy coating, then taken out
The mold is stood to constant weight, is obtained to surface and is bonded with the mold of powder bed.Since mold is heated, when in laser alloy coating
Between it is shorter, when taking-up, still keeps hot, therefore under heat effect, the dehydrated alcohol of die surface can volatilize rapidly, and remaining at
One layer of mixed-powder being firmly bonded can be then formed on its surface by dividing, to facilitate lower step remelting.
(2) mold that surface is bonded with powder bed is placed in protection gas atmosphere, die surface is melted with laser
Solidifying processing stands the mold being cooled to room temperature to get having laser alloying coating to surface in protection gas atmosphere.Its
In, the power of the laser of laser transmitting is 1500 ~ 1900w, and sweep speed is 10 ~ 13 mm/s, and spot diameter is 3 ~ 4.5mm,
Overlapping rate is 20 ~ 25%.
Available fine and close, the higher coating of bond strength, the coating can improve making for mold after laser melting process
Use the service life.Such surface is high with hardness at high temperature, finish is good, coefficient of friction is low, hardly needs subsequent machining,
It can directly upper production line use.
The mold is hot-work die.The laser is the CO that maximum power is 5 kW2Laser can be selected
TJ-HL-T5000 type CO2Laser.
Protection gas atmosphere described in step (2) is argon atmosphere, wherein the flow for argon gas is 1.0 ~ 2.0 L/min.
Compared with prior art, the invention has the following beneficial effects:
1, the present invention uses micron powder for basic raw material, in this way after ethyl alcohol volatilization, can be formed and be caused in die surface
Close, bright and clean powder bed, avoid the stomata of existing alloying component, be mingled with, crackle the defects of generation.
2, preparation can be completed in laser alloy coating of the invention at room temperature, and simple production process is easy.
3, currently, hot-work die working face often will appear steel bonding problem after a period of time is used continuously in hot environment, make
With the present invention after steel cylinder ring moulds face surface forms new alloy-layer, the problem of steel bonding, is significantly improved.
4, using laser surface alloying, surface roughness can satisfy requirement.In addition to laser surface alloying
This process program, also someone improves the service life of hot-work die by cladding Wear-resistant, high-temperature resistant powder, but its cladding
Layer is coarse, it is necessary to the online use of ability after the machinings such as vehicle, mill, and the very high cladding layer of hardness, machining ten
Divide difficulty, operability is low.And the present invention is by hot biofilm, laser consolidation treatment, surface is more smooth, does not need machining i.e.
It can be used, substantially increase operability, cost substantially reduces.
5, using the present invention to the laser alloying of hot-work die working face production efficiency, cost is relatively low, step is few, is convenient for
It promotes the use of.
6, the present invention is more than 1 year through production testing, it was demonstrated that the hot-work die red hardness after processed by the invention can be very
It is good, rank of the roughness close to smart car.Using effect is shown, can improve die life to original 2.8 times or more.
Specific embodiment
Invention is further described in detail combined with specific embodiments below.
Embodiment one
The raw material for preparing surface alloying coating is calculated using following mass parts: SiO220 parts, 25 parts of WC, 25 parts of Nb,
21 parts of Mo, 20 parts of Hf, 20 parts of Al, 25 parts of Si, 20 parts of Be, 23 parts of bentonite, 6 ~ 10 parts of shellac, dehydrated alcohol 390
Part.Wherein: SiO2, WC, Nb, Mo, Hf, Al, Si, Be and bentonite be powdery, granularity is at 3 microns or less.
The specific preparation step of alloy coating are as follows:
1) by SiO2, WC, Nb, Mo, Hf, Al, Si, Be and bentonite be crushed to granularity respectively less than 3 microns, then mix
It closes uniformly, obtains alloy powder, it is spare.
2) a part of dehydrated alcohol of shellac is dissolved, obtains the ethanol solution of shellac, it is spare.
3) alloy powder, the ethanol solution of shellac and another part dehydrated alcohol are stirred evenly with blender to get arriving
Laser alloy coating.
The Laser Alloying Treatment of die surface is carried out using above-mentioned surface alloying coating:
1) hot-work die is worked into the size of needs；
2 surface alloying coating is added in the container for being greater than mold；
3) hot-work die is heated to 105 DEG C with chamber type electric resistance furnace, is put into after taking-up in the container equipped with surface alloying coating,
It allows coating to flood mold and takes out mold from coating after 2 seconds, under heat effect, the ethyl alcohol of die surface can volatilize rapidly, stay
The next layer of firm mixed-powder of bonding.
4) laser irradiation die surface is used.Use maximum power for the TJ-HL-T5000 type CO of 5 kW2Laser is to mold
Surface carries out remelting, uses argon gas to be cooled down and protected during consolidation, and flow is 1.8 L/min, adjusts laser function
Rate is 1800w, and sweep speed is 13 mm/s, spot diameter 4.5mm, overlapping rate 25%, can be with after laser melting process
Obtain fine and close, the higher coating of bond strength.
The present embodiment handled after alloying surface at 900 DEG C hardness average value be HRC37, do not carry out surface conjunction
Aurification processing has and is obviously improved, and does not carry out the working face of the surface alloying processing hardness average value at 900 DEG C and is
HRC17.Through production testing, the present embodiment can improve die life to original 3.1 times.
Embodiment two
The raw material for preparing surface alloying coating is calculated using following mass parts: SiO225 parts, 21 parts of WC, 21 parts of Nb,
25 parts of Mo, 24 parts of Hf, 23 parts of Al, 21 parts of Si, 25 parts of Be, 21 parts of bentonite, 8 parts of shellac, 330 parts of dehydrated alcohol.Its
In: SiO2, WC, Nb, Mo, Hf, Al, Si, Be and bentonite be powdery, granularity is at 3 microns or less.
The specific preparation step of surface alloying coating are as follows:
1) by SiO2, WC, Nb, Mo, Hf, Al, Si, Be and bentonite be crushed to granularity respectively less than 3 microns, then mix
It closes uniformly, obtains alloy powder, it is spare.
2) a part of dehydrated alcohol of shellac is dissolved, obtains the ethanol solution of shellac, it is spare.
3) alloy powder, the ethanol solution of shellac and another part dehydrated alcohol are stirred evenly with blender to get arriving
Alloy coating.
The Laser Alloying Treatment of die surface is carried out using above-mentioned surface alloying coating:
1) hot-work die is worked into the size of needs；
2 surface alloying coating is added in the container for being greater than mold；
3) hot-work die is heated to 100 DEG C with chamber type electric resistance furnace, is put into after taking-up in the container equipped with surface alloying coating,
It allows coating to flood mold and takes out mold from coating after 2 seconds, under heat effect, the ethyl alcohol of die surface can volatilize rapidly, stay
The next layer of firm mixed-powder of bonding.
4) laser irradiation die surface is used.Use maximum power for the TJ-HL-T5000 type CO of 5 kW2Laser is to mold
Surface carries out remelting, uses argon gas to be cooled down and protected during consolidation, and flow is 1.8 L/min, adjusts laser function
Rate is 1800w, and sweep speed is 12 mm/s, spot diameter 4mm, and overlapping rate 20% can obtain after laser melting process
To fine and close, the higher coating of bond strength.
The present embodiment handled after alloying surface at 900 DEG C hardness average value be HRC38, do not carry out surface conjunction
Aurification processing has and is obviously improved, and does not carry out the working face of the surface alloying processing hardness average value at 900 DEG C and is
HRC17.Through production testing, the present embodiment can improve die life to original 3.7 times.
The above embodiment of the present invention is only example to illustrate the invention, and is not to implementation of the invention
The restriction of mode.For those of ordinary skill in the art, other can also be made not on the basis of the above description
With the variation and variation of form.Here all embodiments can not be exhaustive.It is all to belong to technical solution of the present invention
Changes and variations that derived from are still in the scope of protection of the present invention.
Claims (7)
1. a kind of surface alloying coating, which is characterized in that the raw material including following mass parts: SiO220 ~ 30 parts, WC 20 ~ 25
Part, 20 ~ 25 parts of Nb, 20 ~ 25 parts of Mo, 20 ~ 25 parts of Hf, 20 ~ 25 parts of Al, 20 ~ 25 parts of parts of Si, 20 ~ 25 parts of Be, swelling
15 ~ 25 parts, 6 ~ 10 parts of shellac, 300 ~ 400 parts of dehydrated alcohol of soil；
The surface alloying coating is prepared using following methods:
1) by SiO2, WC, Nb, Mo, Hf, Al, Si, Be and bentonite be crushed to granularity respectively less than 3 microns, then mixing is equal
It is even, alloy powder is obtained, it is spare；
2) a part of dehydrated alcohol of shellac is dissolved, obtains the ethanol solution of shellac, it is spare；
3) alloy powder, the ethanol solution of shellac and another part dehydrated alcohol are stirred evenly with blender to get alloy is arrived
Change coating.
2. surface alloying coating according to claim 1, which is characterized in that the SiO2、WC、Nb、Mo、Hf、Al、Si、Be
With bentonitic granularity less than 3 microns.
3. a kind of die surface processing method, which is characterized in that mold is placed in a timing in the surface alloying coating of claim 1
Between, mold is then taken out, and remelting is carried out to the die surface with laser in protection gas atmosphere, makes die surface shape
At alloying coating, that is, complete the laser alloying of die surface.
4. die surface processing method according to claim 3, which comprises the following steps:
(1) mold is first heated to 70 ~ 110 DEG C, then the mold is immersed in 1 ~ 3s in surface alloying coating, then take out the mold
It stands to constant weight, obtains to surface and be bonded with the mold of powder bed；
(2) mold that surface is bonded with powder bed is placed in protection gas atmosphere, die surface is carried out at consolidation with laser
Reason stands in protection gas atmosphere and is cooled to room temperature, that is, completes the laser alloying of die surface；
Wherein, laser transmitting laser power be 1500 ~ 1900W, sweep speed be 10 ~ 13 mm/s, spot diameter be 3 ~
4.5mm, overlapping rate are 20 ~ 25%.
5. die surface processing method according to claim 4, which is characterized in that the laser is that maximum power is
The CO of 5 kW2Laser.
6. die surface processing method according to claim 4, which is characterized in that protection gas atmosphere described in step (2)
For argon atmosphere, wherein the flow for argon gas is 1.0 ~ 2.0 L/min.
7. die surface processing method according to claim 4, which is characterized in that the mold is hot-work die.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710120484.7A CN106868501B (en) | 2017-03-02 | 2017-03-02 | A kind of surface alloying coating, preparation method and die surface processing method |
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