CN108505036A - A kind of sucker rod base Alloy Coating On 45 coating and preparation method thereof - Google Patents
A kind of sucker rod base Alloy Coating On 45 coating and preparation method thereof Download PDFInfo
- Publication number
- CN108505036A CN108505036A CN201810342514.3A CN201810342514A CN108505036A CN 108505036 A CN108505036 A CN 108505036A CN 201810342514 A CN201810342514 A CN 201810342514A CN 108505036 A CN108505036 A CN 108505036A
- Authority
- CN
- China
- Prior art keywords
- coating
- sucker rod
- preparation
- base alloy
- rod base
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
Landscapes
- 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 sucker rod base Alloy Coating On 45 coatings and preparation method thereof.For coating mainly according to suitable proportioning, manufactured Ni-based coating makes sucker rod surface obtain high-performance abrasion-proof corrosion-inhibiting coating in the case where incuding melting and coating technique.Specific implementation method is as follows:(1) substrate surface is pre-processed;(2) prefabricated Ni-based coating;(3) drying and processing;(4) preparation of induction cladding coating.The Ni-based coating obtained by the invention forms good metallurgical binding at coating interface, and coating structure is refined, do not occur the defects of apparent crackle, gap.Microhardness from base material to coating is significantly improved, and coating hardness value is higher than nearly 5 times of base material, and the wear extent of coating and the coefficient of waste are far below base material under the same conditions so that the sucker rod service life greatly improves.This method can not only obtain high-performance coating, and low with production cost, the efficient, advantages such as production process is environmentally friendly, is easily industrialized.
Description
Technical field
The present invention relates to petroleum industry sucker rod substrate material surfaces to be modified field, more particularly to a kind of sucker rod surface
Nickel coating and preparation method thereof.
Background technology
With the continuous exploitation of petroleum resources, Shallow Oil-Gas resource is petered out, and the exploitation of Deep Oil And Gas Exploration resource is in oil gas
Proportion in yield is continuously increased, and oil production method is also mainly based on mechanically recovering the oil.Sucker rod is most important as mechanical oil recovery
One of device, the stability of the safety and product quality be on active service has vital shadow for the exploitation of petroleum resources
It rings.In use due to drill and petroleum extraction tools, but it is often subjected to various operating modes and the environment abrasion such as draw, cut, rub and corrode
Corrosion factor easily causes the damage of material, causes major accident, causes huge economic loss.And due to the abrasion of material,
The destructive process such as corrosion are mostly since its surface.Therefore, adhere in bad working environments lower surface for sucker rod one layer strong
The research of high, wear-resisting, the erosion-resisting coating material of degree seems very urgent.
Currently, the prior art for preparing protective coating in sucker rod substrate surface includes:Laser melting coating, thermal spraying, argon arc
Technologies such as cladding, but have that production cost is big, coating and base material combination force difference, energy consumption is big, the waste gas and waste liquid that generates pollutes ring
The problems such as border.Incude melting and coating technique have heating speed is fast, heat loss is few, it is efficient, convenient for automation, mechanization and tool
There is the unique advantage processed on the axial plane of cylindrical workpiece, therefore has a good application prospect.
(Xiong Linyong applies alloy technology reinforcing train rail and wheel surface to patent CN101012560A with induction heating melting
Method) provide the method that manufacture is strengthened in the induction cladding of a set of alloy type high intensity steel grade again, but the material mainly for rail,
The research of wheel-use steel material wear-resisting property does not consider the corrosion resisting property of material;Patent CN107012461A (Meng Huimin;Sun Guozheng;It is sweet
Training source;Yu Zeqin;Hu Ge, a kind of preparation method of high corrosion-resistant nickel-base alloy coat) one kind is provided in outer surface of workpiece coating
Superaudio induction heating melting coating method and the preparation for being related to the high corrosion-resistant nickel-base alloy under peracidity oil gas field environment, this method
Cladding electric current be up to 1000-1300A, cladding thermal output is big, basis material heat affected area increase, greatly reduce base material
Energy.And the method that the present invention mainly uses high-frequency induction cladding, the wear-and corrosion-resistant ni base alloy coating of high performance-price ratio is prepared, the painting
Layer not only has excellent wear-and corrosion-resistant performance, but also can greatly reduce production cost.
Invention content
Present invention mainly solves the technical issues of, the present invention is to provide a kind of sucker rod base Alloy Coating On 45 coating and its preparation side
Method, this method are accurately controlled by specifically mixing Ni-based coating formula and incuding cladding temperature and time, make coating with
Basis material quickly forms metallurgical binding, to obtain high-performance abrasion-proof corrosion-inhibiting coating, improves sucker rod service life.
In order to solve the above technical problems, one aspect of the present invention is:A kind of sucker rod base Alloy Coating On 45 is provided
Coating and preparation method thereof, which is characterized in that include the following steps:
Step 1:Substrate surface is pre-processed
Step 2:Co-based alloy powder, hard particles, binder are uniformly mixed by a certain percentage
Step 3:It is using " cold coating " that the Ni-based coating powder of the obtained mixing of step 2 is prefabricated to basis material
On, and be placed on baking oven and make drying and processing, keep the temperature 2 hours
Step 4:Induction cladding processing is carried out to the mixing Ni-based coating described in step 3, is prepared in the substrate surface
Obtain sucker rod base Alloy Coating On 45 coating
Step 5:The coating prepared to induction cladding carries out mechanical processing and performance detection
Preferably, sucker rod base material is 35CrMo in step 1
Preferably, step 1 specific implementation method is:First using the method for mechanical processing, polish workpiece surface
Processing, to remove harmful superficial layer such as surface oxide layer, fatigue layer, coating;Then surface sand-blasting is used, it is thick to improve substrate surface
Change, clean-up effect, finally ultrasonic wave added is used to clean surface irregularities
Preferably, Co-based alloy powder is spherical NiCrBSi self-fluxing alloyed powders, ingredient (wt%) packet in step 2
Contain:0.5-1.1C, 3.5-5.5B, 3.0-4.5Si, 15-20Cr, Fe≤5.0, surplus Ni
Preferably, it is about 500 mesh that hard particles, which are average particle size, in step 2, TiC particles in irregular shape, bonding agent
The waterglass colloid for being 3.1-3.4 for modulus (sodium oxide molybdena and silica molar ratios)
Preferably, by nickel-base alloy powder and TiC particles according to mass ratio it is first 9 in step 2:1 ratio uniform is mixed
It closes, it is that 7%-9% sodium silicate binders uniformly mix that mass ratio, which is then added, and paste is made and coats 1.2mm~1.5mm and arrives
Workpiece surface
Preferably, in step 3 the drying temperature of baking oven at 180 DEG C
Preferably, in step 4, workpiece made of step 3 is placed on the table, workpiece and more bundle induction coils are same
The gap of axis, workpiece surface and induction coil is 2~4mm, opens recirculated water, logical using CX2030C high-frequency induction cladding equipment
Faradic size is overregulated, control cladding temperature is within the scope of 1000-1100 DEG C, and the cladding time is 25-40s, to oil pumping
Bar substrate surface mixing Co-based alloy powder carries out induction heating, after obtaining high-performance coating structure, terminates heating, closes
Power supply
Preferably, the step 5 is specially:The ni base alloy coating of preparation is machined to suitable dimension, is passed through
SEM testing coating metallurgical binding degree is surveyed by microhardness, the wear-resisting property of friction and wear test material by electrochemistry
Try the corrosion resisting property of material.
The beneficial effects of the invention are as follows:Advantageous effect of the present invention:
1, the invention uses high-frequency induction melting and coating technique, has following advantage:A, on the axial plane of cylindrical workpiece
The unique advantage of processing;B, operating cost is low, all lower than technical costs such as laser melting coating, Argon arc claddings;C, generating process environmental protection,
No exhaust gas, waste residue, waste liquid generate;D, speed of production is fast, production efficiency is high, coating can reach good metallurgical binding with matrix;
E, induction melting and coating technique heat penetration is shallow, and the influence to base material is small, is conducive to reduce workpiece deformation tendency.
2, the invention utilizes mixing self-fluxing nature Co-based alloy powder so that the form of coating structure in typical column crystal and
Distribution is more uniform, and grain boundaries Dispersed precipitate has tiny the second phase of grey black, has refined coating structure, and coating and matrix
There are an apparent elements diffusion migration band (DTB) at faying face, illustrate that coating has reached good metallurgical binding with matrix.
3, the invention successfully realizes under the conditions of lower cost in the anti-corrosion painting of sucker rod surface cladding high-strength abrasion-proof
Layer.
4, coating material high-strength abrasion-proof corrosion resisting property is mainly manifested in:The sucker rod manufactured by the invention is micro- hard
It is shown in degree experiment, base material to coating surface microhardness is increased to 812.7HV from 186.2HV, and hardness number improves nearly 5 times;
In frictional wear experiment:The wear extent of coating material is only the 27.7% of base material under identical experiment pressure, under the conditions of same rotational speed,
The friction coefficient of coating material is only the 40.3% of basis material.It is only in the corrosion current of electrochemistry experiment coating material
The 36.8% of base material illustrates that the sucker rod remanufactured by the invention can greatly improve material property, enhances its service life, have
Splendid economic benefits.
Description of the drawings
Fig. 1 is the procedure chart that the present invention prepares Ni-based coating;
Fig. 2 is the schematic diagram that preferably induction cladding of the invention prepares Ni-based coating;
Fig. 3 is sucker rod cross section sampling and testing schematic diagram of the present invention;
Fig. 4 is preferably sucker rod base Alloy Coating On 45 coating metallographic structure figure of the invention;
Fig. 5 is preferably sucker rod base Alloy Coating On 45 coating SEM shape appearance figures of the invention;
Fig. 6 is preferably sucker rod base Alloy Coating On 45 coating XRD spectrum of the invention;
Specific implementation mode
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Embodiment 1:
A kind of sucker rod base Alloy Coating On 45 coating of the present embodiment incudes cladding method, using 35CrMo base materials, take Φ 35mm ×
50mm workpiece sizes, pre-coated coating layer thickness are 1.2mm~1.5mm, are included the following steps:
(1) method first using mechanical processing is pre-processed to substrate surface, burnishing part is carried out to workpiece surface
Reason, to remove harmful superficial layer such as surface oxide layer, fatigue layer, coating;Then surface sand-blasting is used, it is thick to improve substrate surface
Change, clean-up effect, ultrasonic wave added cleaning removal surface is finally used to be mingled with.
(2) it is 9 according to mass ratio to prepare Ni-based coating by NiCrBSi self-fluxing alloyed powders and TiC particles:1 ratio
Then uniformly mixing is mixed into mass ratio as 7%-9% sodium silicate binders in hybrid alloys powder, and uniform stirring, utilizes
Paste is made in " cold coating ".By the paste mixture of acquisition be uniformly applied to (1) step to sample base material on, thickness exists
Within the scope of 1.2mm~1.5mm.
(3) sample of gained in step (2) is put into baking oven by drying and processing, under 180 DEG C of drying temperature, heat preservation
Two hours, the waterglass in coating is made fully to volatilize.The Co-based alloy powder used is the ball that granularity is the mesh of -100 mesh~+300
Shape NiCrBSi self-fluxing alloyed powders, ingredient (wt%) include:0.5-1.1C, 3.5-5.5B, 3.0-4.5Si, 15-20Cr,
Fe≤5.0, surplus Ni;It is about 500 mesh, TiC particles in irregular shape and modulus (sodium oxide molybdena and dioxy with average particle size
SiClx molar ratio) be 3.1-3.4 waterglass colloid.
(4) preparation of induction cladding coating by the sample natural air cooling of gained in step (3) to room temperature, then by sample
It is positioned on experimental bench.Take outer diameter be Φ 60mm, internal diameter be Φ 48mm more bundle induction coils, will be air-cooled after sample be positioned over
In induction coil, and it is coaxial with induction coil, and distance of the sample apart from induction coil is 2~4mm.Open equipment circulating water
System, heating temperature is within the scope of 1000 DEG C -1100 DEG C when then determining induction cladding according to the fusing point of nickel-bass alloy material, heating
For time control within the scope of 25-40s, equipment working frequency is 50-120KHz.After the completion of induction cladding coating, power supply is closed, is waited for
After induction coil is cooled to room temperature, recirculated water is closed.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (9)
1. a kind of sucker rod base Alloy Coating On 45 coating and preparation method thereof;It is characterised in that it includes:
Step 1:Substrate surface is pre-processed;
Step 2:Co-based alloy powder, hard particles, binder are uniformly mixed by a certain percentage;
Step 3:It is using " cold coating " that the Ni-based coating powder of the obtained mixing of step 2 is prefabricated on basis material, and
It is placed on baking oven and makees drying and processing, keep the temperature 2 hours;
Step 4:Induction cladding processing is carried out to the mixing Ni-based coating described in step 3, is prepared in the substrate surface
Sucker rod base Alloy Coating On 45 coating;
Step 5:The coating prepared to induction cladding carries out mechanical processing and performance detection.
2. a kind of sucker rod base Alloy Coating On 45 coating according to claim 1 and preparation method thereof, which is characterized in that step 1
Middle sucker rod base material is 35CrMo.
3. a kind of sucker rod base Alloy Coating On 45 coating according to claim 1 and preparation method thereof, which is characterized in that step 1
Specific implementation method is:First using the method for mechanical processing, grinding process is carried out to workpiece surface, to remove surface oxidation
Harmful superficial layer such as layer, fatigue layer, coating;Then surface sand-blasting is used, substrate surface roughening, clean-up effect is improved, finally adopts
Surface irregularities are cleaned with ultrasonic wave added.
4. a kind of sucker rod base Alloy Coating On 45 coating according to claim 1 and preparation method thereof, which is characterized in that step 2
Middle Co-based alloy powder is spherical NiCrBSi self-fluxing alloyed powders, and ingredient (wt%) includes:0.5-1.1C, 3.5-5.5B,
3.0-4.5Si, 15-20Cr, Fe≤5.0, surplus Ni.
5. a kind of sucker rod base Alloy Coating On 45 coating according to claim 1 and preparation method thereof, which is characterized in that step 2
Middle hard particles are that average particle size is about 500 mesh, TiC particles in irregular shape, and bonding agent is modulus (sodium oxide molybdena and titanium dioxide
Silicon mol ratio) be 3.1-3.4 waterglass colloid.
6. a kind of sucker rod base Alloy Coating On 45 coating according to claim 1 and preparation method thereof, which is characterized in that step 2
In be first 9 according to mass ratio by nickel-base alloy powder and TiC particles:1 ratio uniform mixing, it is 7%- that mass ratio, which is then added,
9% sodium silicate binder uniformly mixes, and paste is made and uniformly coats 1.2mm~1.5mm to workpiece surface.
7. a kind of sucker rod base Alloy Coating On 45 coating according to claim 1 and preparation method thereof, which is characterized in that step 3
The drying temperature of middle baking oven is at 180 DEG C.
8. a kind of sucker rod base Alloy Coating On 45 coating according to claim 1 and preparation method thereof, which is characterized in that step 4
In, workpiece made of step 3 is placed on the table, more bundle induction coils and workpiece are coaxial, workpiece surface and induction coil
Gap be 2~4mm, open recirculated water, using CX2030C high-frequency induction cladding equipment, control cladding temperature is in 1000-1100
Within the scope of DEG C, the cladding time is 25-40s, carries out induction heating to sucker rod substrate surface mixing Co-based alloy powder, obtains
After the coating structure for obtaining good metallurgical binding, terminate heating, closes power supply.
9. a kind of sucker rod base Alloy Coating On 45 coating according to claim 1 and preparation method thereof, which is characterized in that the step
Rapid five are specially:The ni base alloy coating of preparation is machined to suitable dimension, passes through SEM testing coating metallurgical binding journeys
Degree, by the wear-resisting property of microhardness, friction-wear test test material, passes through the resistance to of electrochemical corrosion test test material
Corrosion energy.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810342514.3A CN108505036A (en) | 2018-04-17 | 2018-04-17 | A kind of sucker rod base Alloy Coating On 45 coating and preparation method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810342514.3A CN108505036A (en) | 2018-04-17 | 2018-04-17 | A kind of sucker rod base Alloy Coating On 45 coating and preparation method thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
CN108505036A true CN108505036A (en) | 2018-09-07 |
Family
ID=63382212
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201810342514.3A Pending CN108505036A (en) | 2018-04-17 | 2018-04-17 | A kind of sucker rod base Alloy Coating On 45 coating and preparation method thereof |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN108505036A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110158010A (en) * | 2019-06-24 | 2019-08-23 | 中国石油大学(华东) | A kind of high quality axial workpiece preparation method and device based on thermal spraying and induction melting and coating technique |
CN110195205A (en) * | 2019-07-12 | 2019-09-03 | 中国矿业大学徐海学院 | A kind of preparation method of material surface anticorrosion antiwear alloy coat |
CN115365490A (en) * | 2022-09-13 | 2022-11-22 | 中国矿业大学 | Coating powder for hard particle composite reinforced structure and ultrasonic frequency induction cladding process |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201053030Y (en) * | 2007-06-13 | 2008-04-30 | 华中科技大学 | Laser induction composite smelting and coating device for preparing material coat |
-
2018
- 2018-04-17 CN CN201810342514.3A patent/CN108505036A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201053030Y (en) * | 2007-06-13 | 2008-04-30 | 华中科技大学 | Laser induction composite smelting and coating device for preparing material coat |
Non-Patent Citations (1)
Title |
---|
陈鹏: ""高频感应熔覆制备Ni基合金涂层研究"", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110158010A (en) * | 2019-06-24 | 2019-08-23 | 中国石油大学(华东) | A kind of high quality axial workpiece preparation method and device based on thermal spraying and induction melting and coating technique |
CN110158010B (en) * | 2019-06-24 | 2023-08-11 | 中国石油大学(华东) | Shaft part preparation method based on thermal spraying and induction cladding technology |
CN110195205A (en) * | 2019-07-12 | 2019-09-03 | 中国矿业大学徐海学院 | A kind of preparation method of material surface anticorrosion antiwear alloy coat |
CN115365490A (en) * | 2022-09-13 | 2022-11-22 | 中国矿业大学 | Coating powder for hard particle composite reinforced structure and ultrasonic frequency induction cladding process |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN108505036A (en) | A kind of sucker rod base Alloy Coating On 45 coating and preparation method thereof | |
CN103484810B (en) | Plasma cladding in-situ synthesized TiB2-TiC-TiN reinforced high-entropy alloy coating material and preparation method thereof | |
CN102936724B (en) | Method for reinforcing nickel-base alloy layer on aluminum alloy surface | |
CN110438487A (en) | Wear-resistant corrosion-resistant laser cladding layer of a kind of micro-nano granules enhancing and preparation method thereof | |
CN107354421B (en) | A kind of preparation method of graphene-copper-amorphous composite coating | |
Feifei et al. | Effect of rare earth oxides on the morphology of carbides in hardfacing metal of high chromium cast iron | |
CN102453909B (en) | Method for manufacturing bimetallic composite board | |
Wang et al. | Effect of the content of ball-milled expanded graphite on the bending and tribological properties of copper–graphite composites | |
US4886583A (en) | Formation of protective coatings by electrolytic codeposition of a nickel-cobalt matrix and ceramic particles | |
CN109972134A (en) | A method of FeCoNiCrMn high entropy alloy coating is prepared on potassium steel surface | |
CN104141122B (en) | A kind of metal base surface aluminum oxide coating layer and preparation method thereof | |
CN110629153B (en) | Preparation method of graphene nanosheet/amorphous iron-based composite coating | |
Zhang et al. | Microstructure and properties of composite coatings by laser cladding Inconel 625 and reinforced WC particles on non-magnetic steel | |
CN105543838A (en) | Remanufacturing method for marine crankshaft | |
CN110438496A (en) | Vacuum cladding+chemical plating is molten-structure and preparation method thereof of plating composite coating | |
WO2014040215A1 (en) | Formulation of fecrc fe-based powder alloy for argon arc overlay welding and preparation process therefor | |
CN107378167A (en) | A kind of method of raising SiCp/Al composite stirring friction welding agitator head wearabilities | |
Xue et al. | Effect of medium entropy alloy powder-core wire on friction wear and corrosion resistance of arc cladding additive layer | |
CN105671544A (en) | Method for improving wear-resisting property of 42CrMo steel in laser cladding through cladding powder | |
CN108642502A (en) | The corrosion-resistant pre-treating method of aluminium alloy | |
CN108642326A (en) | A kind of method of 560HV cobalt-baseds high temperature resistant laser cladding powder and laser melting coating | |
Zhao et al. | Study on wear properties of 7075 aluminum alloy by laser alloying imitating shell surface structure with different unit spacing | |
CN116426920A (en) | Yttria-modified gradient wear-resistant coating for titanium alloy and preparation method thereof | |
CN114042911B (en) | Composite powder, composite coating, preparation method and application thereof | |
CN109136910A (en) | A kind of high abrasion coating material and the preparation method and application thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180907 |
|
WD01 | Invention patent application deemed withdrawn after publication |