CN112725791B - TiB 2 /Fe 64 Ni 36 Composite coating and preparation method thereof - Google Patents
TiB 2 /Fe 64 Ni 36 Composite coating and preparation method thereof Download PDFInfo
- Publication number
- CN112725791B CN112725791B CN202011575379.0A CN202011575379A CN112725791B CN 112725791 B CN112725791 B CN 112725791B CN 202011575379 A CN202011575379 A CN 202011575379A CN 112725791 B CN112725791 B CN 112725791B
- Authority
- CN
- China
- Prior art keywords
- tib
- powder
- composite coating
- mixed powder
- preparation
- 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.)
- Active
Links
Images
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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention belongs to the field of laser processing of surface coatings of metal-based composite materials, and relates to TiB 2 /Fe 64 Ni 36 A method for preparing the composite coating. The TiB 2 /Fe 64 Ni 36 The preparation method of the composite coating comprises the following steps: (1) screening Fe, Ni, Ti and Fe-B powder with proper grain size, and uniformly mixing the powders according to a proportion to obtain mixed powder; (2) carrying out low-speed ball milling on the mixed powder in the step (1) in a ball mill for 1-3 h, and then placing the mixed powder in a constant-temperature drying box for drying; (3) conveying the dried mixed powder obtained in the step (2) to the surface of a substrate in a laser action area by using a coaxial powder feeding device, melting and depositing the mixed powder on the surface of the substrate by using a laser light source under the argon protection atmosphere, and preparing the TiB 2 /Fe 64 Ni 36 And (4) composite coating. The invention provides a method which is convenient to operate, low in cost and high in automation degree.
Description
Technical Field
The invention belongs to the field of laser processing of surface coatings of metal-based composite materials, and relates to TiB 2 /Fe 64 Ni 36 A method for preparing a composite coating.
Background
Laser deposition techniques can produce high performance coatings with good metallurgical bonding. With controllable coating thickness, laser deformation degree, etc. However, due to the rapid heating and quenching characteristics of the laser deposition process, the coating has relatively large residual internal stress, so that the laser deposition coating cracks, and the application of the laser deposition technology is limited.
The invar alloy has the characteristic of extremely low thermal expansion coefficient, and can effectively inhibit cracks caused by residual stress when being introduced into a laser deposition preparation process. The invar alloy has low hardness and poor wear resistance, and is difficult to meet the use requirements of structural components with high surface performance requirements such as a high-speed train braking system, a railway turnout and the like, so that the research on the strengthening of the invar alloy has great application prospect.
When the invar alloy is prepared by laser deposition, the invar alloy is enhanced by an in-situ authigenic ceramic enhanced phase mode, so that the hardness and the wear resistance of the invar alloy can be improved on the premise of maintaining the invar effect, and the invar-based composite coating with excellent performance is prepared.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention provides a method which is convenient to operate, low in cost and high in automation degree: the mixed powder is directly melted and deposited on the surface of the existing metal material by utilizing a laser deposition technology to form TiB 2 /Fe 64 Ni 36 Composite coatings on Fe by changing the atomic ratio of Ti/B 64 Ni 36 Preparing TiB in the composite coating 2 Reinforcing the particles.
TiB 2 /Fe 64 Ni 36 The preparation method of the composite coating comprises the following steps:
(1) screening Fe, Ni, Ti and Fe-B powder with proper particle size, and uniformly mixing the powder according to the proportion to obtain mixed powder;
(2) carrying out low-speed ball milling on the mixed powder in the step (1) in a ball mill for 1-3 h, and then placing the mixed powder in a constant-temperature drying box for drying;
(3) conveying the dried mixed powder obtained in the step (2) to the surface of a substrate in a laser action area by using a coaxial powder feeding device, melting and depositing the mixed powder on the surface of the substrate by using a laser light source under the argon protection atmosphere, and preparing the TiB 2 /Fe 64 Ni 36 And (4) composite coating.
Further, when a proper Ti/B ratio is addedIn the case of the reaction, TiB can be obtained 2 Is a composite coating of a reinforcing phase.
Further, TiB 2 /Fe 64 Ni 36 The composite coating is prepared by directly depositing the following element powder in percentage by mass by a laser technology: Fe/Ni 64: 36, the mass percentage of the B element is 3 percent.
Further, the atomic percentage of Ti/B is 0.25-1.
Furthermore, each powder is spherical, and the particle size range of the powder is 140-300 meshes.
Further, in the step (2), the ball milling time is 2 hours, the ball milling rotation speed is 200r/min, and the constant-temperature drying temperature of the mixed powder is 50 ℃.
Further, the powder feeding device adopted in the step (3) is a coaxial powder feeder for realizing automatic powder feeding, the powder feeding speed of the powder feeding device is 10g/min, and the carrier gas flow is 6L/min.
Further, the laser light source in the step (3) is an LDM-2500-60 type semiconductor laser, the used laser power is 800W, the laser light spot is a circular light spot, the diameter of the light spot is 2-4 mm, and the scanning speed is 250-350 mm/min.
Further, the substrate in the step (3) is made of 45 steel.
The beneficial effects brought by the invention are as follows:
1. the invention provides a novel iron-nickel alloy containing in-situ authigenic ceramic reinforcing phases, which can be used for obtaining iron-nickel alloys containing reinforcing phases of different types and proportions by adjusting the proportion of pre-filled powder.
2. According to the invention, the ceramic reinforcing phase is generated in situ on the iron-nickel alloy matrix, so that the hardness and wear resistance of the alloy are effectively improved, wherein the hardness is improved by more than 2 times compared with that of pure invar alloy, and the reinforcing effect is obvious.
3. The preparation method provided by the invention is convenient to operate, low in cost, high in automation degree and very wide in market prospect.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 shows TiB prepared by the laser deposition technique of example 1 2 /Fe 64 Ni 36 And (4) a composite coating micro-topography map.
FIG. 2 shows TiB prepared by the laser deposition technique of example 2 2 /Fe 64 Ni 36 And (5) a composite coating micro-topography map.
FIG. 3 shows TiB prepared by the laser deposition technique of example 3 2 /Fe 64 Ni 36 And (5) a composite coating micro-topography map.
FIG. 4 shows TiB prepared by the laser deposition technique of example 4 2 /Fe 64 Ni 36 And (5) a composite coating micro-topography map.
Detailed Description
The invention is further illustrated by the following specific examples. These examples are intended only to illustrate the invention and are not intended to limit the scope of the invention.
Example 1
TiB 2 /Fe 64 Ni 36 The preparation method of the composite coating mainly comprises the following steps:
the substrate material is 45 steel plate type with the size of 100mm multiplied by 10mm, the substrate is subjected to sand blasting treatment by a QF-6050 type manual sand blasting machine, and the abrasive material is carborundum.
Preparing composite powder: selecting 140-300 meshes of Fe, Ni, Ti and Fe-B powder, uniformly mixing by adopting a ball milling process, and drying, wherein the chemical components are as follows: the mass ratio of Fe to Ni is 64: 36, the content of the element B is 3% by mass, and the atomic ratio of Ti/B is 0.25.
Preparation of TiB by laser deposition 2 /Fe 64 Ni 36 Composite coating material: during laser deposition, the single-layer deposition path is in an's' shape, after the single-layer deposition is finished, the cladding head moves back to the initial position, and then the z axis is lifted for a certain distance to repeat the single-layer deposition process.
During laser deposition, high-purity argon is adopted for protection, wherein the gas flow is 9L/min, the laser power is 800W, and the scanning speed is 350 mm/min. The raw material adding mode of coaxial powder feeding is adopted, the powder feeding speed is 10g/min, the powder feeding gas is high-purity argon, and the carrier gas flow is 6L/min. With 6 passes of 10 layer stack deposition, the overlap ratio was 50% and the z-axis lift was 0.3 mm/layer.
Example 2
TiB 2 /Fe 64 Ni 36 The preparation method of the composite coating mainly comprises the following steps:
the substrate material is 45 steel plate type pieces with the size of 100mm multiplied by 10mm, the substrate is subjected to sand blasting treatment by adopting a QF-6050 type manual sand blasting machine, and the abrasive material is carborundum.
Preparing composite powder: selecting 140-300 meshes of Fe, Ni, Ti and Fe-B powder, uniformly mixing by adopting a ball milling process, and drying, wherein the chemical components are as follows: the mass ratio of Fe to Ni is 64: 36, the content of the element B is 3% by mass, and the atomic ratio of Ti/B is 0.5.
Preparation of TiB by laser deposition 2 /Fe 64 Ni 36 Composite coating material: during laser deposition, the single-layer deposition path is in an's' shape, after the single-layer deposition is finished, the cladding head moves back to the initial position, and then the z axis is lifted for a certain distance to repeat the single-layer deposition process.
During laser deposition, high-purity argon is adopted for protection, wherein the gas flow is 9L/min, the laser power is 800W, and the scanning speed is 350 mm/min. The raw material adding mode of coaxial powder feeding is adopted, the powder feeding speed is 10g/min, the powder feeding gas is high-purity argon, and the carrier gas flow is 6L/min. With 6 passes of 10 layer stack deposition, the overlap ratio was 50% and the z-axis lift was 0.3 mm/layer.
Example 3
TiB 2 /Fe 64 Ni 36 The preparation method of the composite coating mainly comprises the following steps:
the substrate material is 45 steel plate type pieces with the size of 100mm multiplied by 10mm, the substrate is subjected to sand blasting treatment by adopting a QF-6050 type manual sand blasting machine, and the abrasive material is carborundum.
Preparing composite powder: selecting 140-300 meshes of Fe, Ni, Ti and Fe-B powder, uniformly mixing by adopting a ball milling process, and drying, wherein the chemical components are as follows: the mass ratio of Fe to Ni is 64: 36, the content of the element B is 3% by mass, and the atomic ratio of Ti/B is 0.75.
Preparation of TiB by laser deposition 2 /Fe 64 Ni 36 Composite coating material: during laser deposition, the single-layer deposition path is in an's' shape, after the single-layer deposition is finished, the cladding head moves back to the initial position, and then the z axis is lifted for a certain distance to repeat the single-layer deposition process.
During laser deposition, high-purity argon is adopted for protection, wherein the gas flow is 9L/min, the laser power is 800W, and the scanning speed is 350 mm/min. The raw material adding mode of coaxial powder feeding is adopted, the powder feeding speed is 10g/min, the powder feeding gas is high-purity argon, and the carrier gas flow is 6L/min. With 6 passes of 10 layer stack deposition, the overlap ratio was 50% and the z-axis lift was 0.3 mm/layer.
Example 4
TiB 2 /Fe 64 Ni 36 The preparation method of the composite coating mainly comprises the following steps:
the substrate material is 45 steel plate type pieces with the size of 100mm multiplied by 10mm, the substrate is subjected to sand blasting treatment by adopting a QF-6050 type manual sand blasting machine, and the abrasive material is carborundum.
Preparing composite powder: selecting 140-300 meshes of Fe, Ni, Ti and Fe-B powder, uniformly mixing by adopting a ball milling process, and drying, wherein the chemical components are as follows: the mass ratio of Fe to Ni is 64: 36, the content of the element B is 3 percent by mass, and the atomic ratio of Ti to B is 1.
Preparation of TiB by laser deposition 2 /Fe 64 Ni 36 Composite coating material: during laser deposition, the single-layer deposition path is in an's' shape, after the single-layer deposition is finished, the cladding head moves back to the initial position, and then the z axis is lifted for a certain distance to repeat the single-layer deposition process.
During laser deposition, high-purity argon is adopted for protection, wherein the gas flow is 9L/min, the laser power is 800W, and the scanning speed is 350 mm/min. The raw material adding mode of coaxial powder feeding is adopted, the powder feeding speed is 10g/min, the powder feeding gas is high-purity argon, and the carrier gas flow is 6L/min. With 6 passes of 10 layer stack deposition, the overlap ratio was 50% and the z-axis lift was 0.3mm per layer.
The above embodiments are only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore all equivalent technical solutions also belong to the scope of the present invention, and the scope of the present invention should be defined by the claims.
The above description is a preferred mode of operation of the present invention and is not intended to limit the scope of the invention, and other modifications, improvements, and equivalents may be made without departing from the spirit of the invention.
The foregoing shows and describes the fundamental principles and the essential features of the invention, together with the advantages thereof, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. TiB 2 /Fe 64 Ni 36 The preparation method of the composite coating is characterized by comprising the following steps:
(1) screening Fe, Ni, Ti and Fe-B powder with proper grain size, and uniformly mixing the powders according to the proportion to obtain mixed powder, wherein the Fe/Ni ratio is 64: 36, the mass percentage of the B element is 3 percent, and when the atomic percentage of the added Ti/B is 0.25-1, the TiB can be obtained 2 A composite coating which is a reinforcing phase;
(2) carrying out low-speed ball milling on the mixed powder obtained in the step (1) in a ball mill for 1-3 h, and then placing the mixed powder in a constant-temperature drying box for drying;
(3) conveying the dried mixed powder obtained in the step (2) to the surface of a substrate in a laser action area by using a coaxial powder feeding device, melting and depositing the mixed powder on the surface of the substrate by using a laser light source under the argon protection atmosphere, and preparing the TiB 2 /Fe 64 Ni 36 Composite coatings, TiB 2 /Fe 64 Ni 36 The composite coating is prepared by directly depositing the element powder with the mass percentage in the step (1) through a laser technology.
2. A TiB according to claim 1 2 /Fe 64 Ni 36 The preparation method of the composite coating is characterized in that each powder is spherical, and the particle size range of the powder is 140-300 meshes.
3. A TiB according to claim 1 2 /Fe 64 Ni 36 The preparation method of the composite coating is characterized in that the ball milling time in the step (2) is 2 hours, the ball milling rotating speed is 200r/min, and the constant temperature drying temperature of the mixed powder is 50 ℃.
4. A TiB according to claim 1 2 /Fe 64 Ni 36 The preparation method of the composite coating is characterized in that the powder feeding device adopted in the step (3) is a coaxial powder feeder for realizing automatic powder feeding, the powder feeding speed of the powder feeding device is 10g/min, and the flow rate of carrier gas is 6L/min.
5. A TiB according to claim 1 2 /Fe 64 Ni 36 The preparation method of the composite coating is characterized in that the laser light source in the step (3) is an LDM-2500-60 type semiconductor laser, the used laser power is 800W, the laser spot is a circular spot, the diameter of the spot is 2-4 mm, and the scanning speed is 250-350 mm/min.
6. A TiB according to claim 1 2 /Fe 64 Ni 36 The preparation method of the composite coating is characterized in thatAnd (4) adopting 45 steel as the substrate in the step (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011575379.0A CN112725791B (en) | 2020-12-28 | 2020-12-28 | TiB 2 /Fe 64 Ni 36 Composite coating and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011575379.0A CN112725791B (en) | 2020-12-28 | 2020-12-28 | TiB 2 /Fe 64 Ni 36 Composite coating and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112725791A CN112725791A (en) | 2021-04-30 |
| CN112725791B true CN112725791B (en) | 2022-09-27 |
Family
ID=75606155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011575379.0A Active CN112725791B (en) | 2020-12-28 | 2020-12-28 | TiB 2 /Fe 64 Ni 36 Composite coating and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112725791B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113913814B (en) * | 2021-10-11 | 2023-11-10 | 华东交通大学 | Eutectic structure and in-situ autogenous TiB-based material 2 Preparation method of synergistically reinforced laser cladding high-wear-resistance invar alloy coating |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276118C (en) * | 2004-10-19 | 2006-09-20 | 哈尔滨工业大学 | Composite material layer melted and coated on surface of titanium alloy through laser |
| US8034153B2 (en) * | 2005-12-22 | 2011-10-11 | Momentive Performances Materials, Inc. | Wear resistant low friction coating composition, coated components, and method for coating thereof |
| CN100516299C (en) * | 2007-06-04 | 2009-07-22 | 西安交通大学 | Method for preparing compound coat between metals |
| CN100587112C (en) * | 2007-10-18 | 2010-02-03 | 天津大学 | Plasma arc method for preparing large-thickness TiB2 coating |
| US9108276B2 (en) * | 2008-05-16 | 2015-08-18 | Consolidated Nuclear Security, LLC | Hardface coating systems and methods for metal alloys and other materials for wear and corrosion resistant applications |
| US8691343B2 (en) * | 2008-05-16 | 2014-04-08 | Babcock & Wilcox Technical Services Y-12, Llc | Toughened and corrosion- and wear-resistant composite structures and fabrication methods thereof |
| WO2010127015A2 (en) * | 2009-04-30 | 2010-11-04 | Chevron U.S.A. Inc. | Surface treatment of amorphous coatings |
| CN102226279A (en) * | 2011-06-13 | 2011-10-26 | 山东电力研究院 | Method for preparing titanium diboride and titanium carbide enhanced iron-based wear resistant composite paint |
| TWI576330B (en) * | 2012-02-23 | 2017-04-01 | 財團法人工業技術研究院 | Method for providing a coating layer with protection and thermal conductivity |
| CN111304648B (en) * | 2020-04-09 | 2022-05-17 | 南华大学 | TiBw-NiTi composite coating and preparation method thereof |
-
2020
- 2020-12-28 CN CN202011575379.0A patent/CN112725791B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112725791A (en) | 2021-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101285187B (en) | Method for preparing particulate reinforced metal-based composite material | |
| CN109439995B (en) | High-entropy amorphous alloy coating and preparation method thereof | |
| CN110744047A (en) | Preparation method of aluminum-based composite material | |
| CN109332695B (en) | Selective laser melting preparation method of molybdenum-based alloy with enhanced oxidation resistance | |
| CN111850550A (en) | WC reinforced high-entropy alloy powder for laser cladding and coating preparation method | |
| CN109290583A (en) | A method of it eliminating 7075 aluminium alloy selective laser meltings and forms crackle | |
| CN104120424B (en) | Iron based laser cladding powder and cladding layer preparation method | |
| CN110744058A (en) | Preparation method for in-situ synthesis of copper-based composite material | |
| CN112725791B (en) | TiB 2 /Fe 64 Ni 36 Composite coating and preparation method thereof | |
| CN106424700A (en) | Laser direct deposition ceramic enhanced Fe60 alloy composite wear resistant coating and method | |
| CN107838417B (en) | A kind of iron Al-based agent diamond tool and preparation method thereof | |
| CN114951696B (en) | FeCrTiV manufactured on surface of ferrite/martensitic steel by laser additive 0.5 Ni 0.5 High entropy alloy coating and method | |
| CN105671544B (en) | The method for improving 42CrMo steel anti-wear performances in laser melting coating using cladding powder | |
| CN114703394A (en) | High-temperature material and preparation method and application thereof | |
| CN114086142A (en) | High-entropy alloy rotary target and preparation method of cold spraying thereof | |
| Liu et al. | Preparation of Al2O3 magnetic abrasives by combining plasma molten metal powder with sprayed abrasive powder | |
| CN113621958A (en) | Method for laser cladding of high-entropy alloy coating on copper surface | |
| CN114875291B (en) | High-entropy alloy powder and preparation method thereof, and high-entropy alloy laser cladding layer and preparation method thereof | |
| CN117089834A (en) | Refractory high-entropy alloy powder for ultra-high-speed laser cladding, coating and preparation method thereof | |
| CN114807724B (en) | Wear-resistant composite material prepared by laser 3D printing technology and method | |
| CN115109981B (en) | Oxide dispersion strengthening TaNbVTi refractory high-entropy alloy and preparation method and application thereof | |
| CN112760636B (en) | Method for in-situ synthesis of molybdenum-silicon-boron alloy coating by laser cladding | |
| CN116275010A (en) | In-situ nitride reinforced 3D printing nickel-based superalloy powder | |
| CN112958783B (en) | Laser melting deposition refractory high-entropy alloy micro-laminated composite material and preparation method and application thereof | |
| CN111455376A (en) | Cr for enhancing corrosion resistance of 45# steel7C3-Mo2NiB2Preparation method of complex phase ceramic coating |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |