CN110592523A - Method for improving bonding strength of thermal spraying coating and metal substrate - Google Patents
Method for improving bonding strength of thermal spraying coating and metal substrate Download PDFInfo
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- CN110592523A CN110592523A CN201911016231.0A CN201911016231A CN110592523A CN 110592523 A CN110592523 A CN 110592523A CN 201911016231 A CN201911016231 A CN 201911016231A CN 110592523 A CN110592523 A CN 110592523A
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- thermal spraying
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- remelting
- transition layer
- metal substrate
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- 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
- C23C24/106—Coating with metal alloys or metal elements only
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- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
Abstract
The invention discloses a method for improving the bonding strength of a thermal spraying coating and a metal base material, which belongs to the technical field of surface engineering, wherein a laser spraying device is adopted to form an intermediate transition layer on the surface of a preheated metal base material, a plasma thermal spraying device is adopted to prepare a thermal spraying coating on the surface of the transition layer, a plasma transferred arc remelting technology is adopted to carry out remelting post-treatment on the thermal spraying coating, the metal base material with the thermal spraying coating is slowly cooled to room temperature in the air after the remelting post-treatment is finished, the intermediate transition layer formed by the laser spraying device is metallurgically bonded with the metal base material, the bonding mode between the thermal spraying coating and the metal base material is changed after the remelting post-treatment is carried out on the thermal spraying coating formed on the surface of the transition layer, the bonding strength between the thermal spraying coating and the metal base material can be effectively improved, and the inherent defects, effectively solves the important problem of how to greatly improve the interface bonding of the thermal spraying metal alloy coating particles.
Description
Technical Field
The invention relates to the technical field of surface engineering, in particular to a method for improving the bonding strength of a thermal spraying coating and a metal substrate.
Background
At present, the thermal spraying technology is widely applied to the surface treatment in the fields of aviation, aerospace, steel, petrifaction, energy, automobiles and the like; the hot spraying technology has simple process, wide selection range of coating and substrate materials, easy formation of wear-resistant, heat-insulating, oxidation-resistant, corrosion-resistant, insulating and conductive coatings and easy control of coating thickness, and can be applied to large-area construction on site. However, the technological characteristics of the thermal spraying coating formed by spreading, deforming, stacking and solidifying of high-speed flying liquid drops impacting a base material determine that the thermal spraying coating has structural defects of uneven tissue components, air holes, cracks, weak bonding between lath layers and the like, particularly weak bonding (mainly mechanical occlusion) between the coating and a base body, and the application range and the service life of the coating are greatly limited.
Thermal spray coatings are built up from disk-shaped particles formed by deformation of particles from a molten or semi-molten state, having a layered structure, the interfacial bonding state between the layers of particles within the coating significantly affecting or even controlling various properties of the coating. Research shows that the bonding rate between particle layers of the coating is very limited and is only 32% at most no matter the coating is a metal coating or a thermal spraying ceramic coating, and various mechanical properties (such as elastic modulus, fracture toughness, erosion wear rate), electric conductivity, thermal conductivity and the like of the coating are controlled by the limited bonding of interfaces between the particle layers in the coating, so that the properties of the coating are 10% -30% of the properties of corresponding blocks. On the other hand, the unbonded interface and other types of pores are communicated with each other to form a through pore which penetrates from the surface of the coating to the coating/substrate interface, so that the coating cannot completely block and isolate the contact between a corrosive medium and a substrate alloy, and the corrosion resistance effect of the thermal spraying coating prepared by the material with excellent wear resistance is not ideal.
In response to this problem of coatings, two methods are generally used for post-treating the coating: (1) by adopting proper remelting treatment, the bonding strength between the coating and the matrix and the internal quality of the coating can be improved, so that the wear resistance and the corrosion resistance of the coating are improved; however, the remelting technique has two disadvantages: 1) because the laser spot area is small, the working efficiency is low, and the requirement of laser remelting of a large-area spray coating on the surface of a workpiece is difficult to meet; 2) laser surface treatment techniques are, at present, costly. (2) The sealing treatment by adopting the organic or inorganic solvent liquid sealant can improve the corrosion resistance of the coating, but is influenced by the physical and chemical properties of the sealant, the sealing depth is limited, other properties of the coating cannot be obviously improved, and the sealing effect fails along with the occurrence of coating abrasion and the like due to the disappearance of the sealing layer; meanwhile, the use temperature of the sealing agent is also limited because the main sealing material is an organic sealing agent. Therefore, for the problem of limited bonding of the particle interface of the thermal spray coating for controlling the coating performance, an effective method for forming complete bonding between particles directly in the spraying process has not been found so far, and the bonding strength of the thermal spray coating and the metal substrate can be remarkably improved.
Disclosure of Invention
The invention provides a method for improving the bonding strength of a thermal spraying coating and a metal substrate, which adopts a laser cladding technology to realize metallurgical bonding between the thermal spraying coating and the metal substrate, can effectively improve the bonding strength between the thermal spraying coating and the metal substrate, overcomes the inherent defects of the thermal spraying coating by changing the bonding mode between the thermal spraying coating and the metal substrate, and effectively solves the major problem of how to greatly improve the bonding of the particle interface of the thermal spraying metal alloy coating.
The specific technical scheme provided by the invention is as follows:
the invention provides a method for improving the bonding strength of a thermal spraying coating and a metal substrate, which comprises the following steps:
the method comprises the following steps: pretreating the surface of the metal base material before thermal spraying, wherein the pretreatment comprises cleaning and decontaminating with alcohol, cleaning floating dust with a brush, blasting sand and blasting, derusting and phosphorylation;
step two: after the surface pretreatment of the metal base material is finished, preheating the metal base material at the preheating temperature of 140-180 ℃;
step three: forming an intermediate transition layer with the thickness of 0.4-0.6 mm on the surface of the preheated metal substrate by adopting laser spraying equipment, wherein the intermediate transition layer is made of NiCr or MCrAlY alloy;
step four: preparing a thermal spraying coating with the thickness of 0.2-0.8 mm on the surface of the transition layer by adopting plasma thermal spraying equipment, wherein the thermal spraying coating is made of nickel-based alloy;
step five: and (3) remelting the thermal spraying coating by adopting a plasma transferred arc remelting technology, and slowly cooling the metal substrate with the thermal spraying coating to room temperature in air after remelting post-treatment is completed.
Optionally, a laser spraying device is used to form a middle transition layer with a thickness of 0.4-0.6 mm on the surface of the preheated metal substrate, and the method specifically includes the following steps:
preparing a 0.4-0.6 mm intermediate transition layer on the surface of the preheated metal substrate by adopting laser spraying equipment, wherein the specific parameters of the laser spraying equipment are as follows: the laser power is 3-14kW, the light spot of the laser beam is rectangular, the size of the rectangular light spot is 8-40mm on the long side and 4mm on the short side, the scanning speed of the laser head is 3-800mm/s, and the middle transition layer and the metal base material are in metallurgical bonding.
Optionally, the plasma transferred arc remelting technology is adopted to carry out remelting on the thermal spray coating, and control parameters in the process of remelting treatment are that the moving speed of a plasma welding gun is 80mm/min, the remelting current is 60A, and the plasma gas flow is 6L/min.
Optionally, a plasma transferred arc remelting technology is adopted to protect the thermal spray coating by using a gas hood in the remelting post-treatment process, and an atmospheric plasma spraying technology is adopted.
The invention has the following beneficial effects:
the embodiment of the invention provides a method for improving the bonding strength of a thermal spraying coating and a metal substrate, which comprises the steps of firstly carrying out pretreatment such as alcohol cleaning and decontamination, brush cleaning and floating dust removal, sand blasting and derusting, phosphorylation and the like on the surface of the metal substrate before thermal spraying, preheating after the pretreatment is finished, forming an intermediate transition layer with the thickness of 0.4-0.6 mm on the surface of the preheated metal substrate by adopting a laser spraying device after the preheating is finished, preparing a thermal spraying coating with the thickness of 0.2-0.8 mm on the surface of the transition layer by adopting a plasma thermal spraying device, carrying out remelting post-treatment on the thermal spraying coating by adopting a plasma transfer arc remelting technology, slowly cooling the metal substrate with the thermal spraying coating in air to room temperature after the remelting post-treatment is finished, and carrying out metallurgical bonding between the intermediate transition layer formed by the laser spraying device and the metal substrate, after the hot spraying coating formed on the surface of the transition layer is subjected to remelting post-treatment, the bonding mode between the hot spraying coating and the metal substrate is changed, the bonding strength between the hot spraying coating and the metal substrate can be effectively improved, the inherent defects of the hot spraying coating are overcome, and the major problem of how to greatly improve the bonding of the particle interface of the hot spraying metal alloy coating is effectively solved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for improving the bonding strength of the thermal spraying coating and the metal substrate comprises the following steps:
the method comprises the following steps: the surface of the metal substrate is pretreated before thermal spraying, and the pretreatment comprises alcohol cleaning and decontamination, brush cleaning and floating dust removal, sand blasting and shot blasting for rust removal and phosphorylation treatment.
Step two: after the surface pretreatment of the metal base material is finished, the metal base material is preheated, wherein the preheating temperature is 140-180 ℃.
Specifically, the pretreated metal substrate may be preheated by flame heating at a preheating temperature of 140 ℃ to 180 ℃, wherein preferably, the preheating temperature is 160 ℃, and the temperature is maintained at the preheating temperature for 1 hour.
Step three: and forming an intermediate transition layer with the thickness of 0.4-0.6 mm on the surface of the preheated metal substrate by adopting laser spraying equipment, wherein the intermediate transition layer is made of NiCr or MCrAlY alloy.
Specifically, adopt laser spraying equipment to form the middle transition layer that one deck thickness is 0.4 ~ 0.6mm on the metal substrate surface after preheating, NiCr or MCrAlY alloy powder is chooseed for use to the material on middle transition layer, and laser spraying equipment's concrete parameter is: the laser power is 3-14kW, the light spot of the laser beam is rectangular, the size of the rectangular light spot is 8-40mm on the long side and 4mm on the short side, the scanning speed of the laser head is 3-800mm/s, and the middle transition layer and the metal base material are in metallurgical bonding.
The laser adopted in the laser spraying equipment of the embodiment of the invention can be one of a CO2 gas laser, a YAG laser, a semiconductor direct output laser, a disc laser, a semiconductor fiber coupling laser, a fiber laser and the like. Moreover, the powder feeding mode in the laser spraying equipment of the embodiment of the invention can be paraxial (lateral) powder feeding, coaxial powder feeding, central powder feeding or asynchronous powder feeding. The intermediate transition layer formed by NiCr or MCrAlY alloy powder is prepared on the surface of the metal base material by adopting laser spraying equipment, so that the light absorption rate of the metal base material and the thermal spraying powder is improved, the intermediate transition layer and the metal base body generate good metallurgical bonding, and the bonding strength of the metallurgical bonding is high.
Step four: preparing a thermal spraying coating with the thickness of 0.2-0.8 mm on the surface of the transition layer by adopting plasma thermal spraying equipment, wherein the thermal spraying coating is made of nickel-based alloy;
step five: and (3) remelting the thermal spraying coating by adopting a plasma transferred arc remelting technology, and slowly cooling the metal substrate with the thermal spraying coating to room temperature in air after remelting post-treatment is completed.
Specifically, the plasma transferred arc remelting technology is adopted to carry out remelting on the thermal spraying coating, and the control parameters in the process of remelting treatment are that the moving speed of a plasma welding gun is 80mm/min, the remelting current is 60A, and the plasma gas flow is 6L/min. And a plasma transferred arc remelting technology is adopted to carry out remelting on the thermal spraying coating, and a gas shield is adopted to protect the thermal spraying coating in the post-treatment process, and an atmospheric plasma spraying technology is adopted. Illustratively, the plasma transferred arc remelting process is carried out using JP-5000 high velocity flame spray equipment from Praxair/TAFA, USA.
Test analysis shows that after plasma transfer arc remelting, a certain metallurgical bonding layer is formed between the surfaces of the thermal spraying coating and the intermediate transition layer, and after the intermediate transition layer and the thermal spraying coating are remelted by the plasma transfer arc, material elements of the intermediate transition layer and the thermal spraying coating are mutually permeated and diffused to form reliable metallurgical bonding, so that the surface bonding strength between the thermal spraying coating and the metal base material can be remarkably improved. The method can obtain the thermal spraying coating which has a compact structure and is metallurgically bonded with the metal base material on the surface of the metal base material, and the formed thermal spraying coating has extremely high structural compactness, high metallurgical bonding strength with the metal base material and wide application prospect.
The embodiment of the invention provides a method for improving the bonding strength of a thermal spraying coating and a metal substrate, which comprises the steps of firstly carrying out pretreatment such as alcohol cleaning and decontamination, brush cleaning and floating dust removal, sand blasting and derusting, phosphorylation and the like on the surface of the metal substrate before thermal spraying, preheating after the pretreatment is finished, forming an intermediate transition layer with the thickness of 0.4-0.6 mm on the surface of the preheated metal substrate by adopting a laser spraying device after the preheating is finished, preparing a thermal spraying coating with the thickness of 0.2-0.8 mm on the surface of the transition layer by adopting a plasma thermal spraying device, carrying out remelting post-treatment on the thermal spraying coating by adopting a plasma transfer arc remelting technology, slowly cooling the metal substrate with the thermal spraying coating in air to room temperature after the remelting post-treatment is finished, and carrying out metallurgical bonding between the intermediate transition layer formed by the laser spraying device and the metal substrate, after the hot spraying coating formed on the surface of the transition layer is subjected to remelting post-treatment, the bonding mode between the hot spraying coating and the metal substrate is changed, the bonding strength between the hot spraying coating and the metal substrate can be effectively improved, the inherent defects of the hot spraying coating are overcome, and the major problem of how to greatly improve the bonding of the particle interface of the hot spraying metal alloy coating is effectively solved.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (4)
1. A method of increasing the bond strength of a thermally sprayed coating to a metal substrate, the method comprising:
the method comprises the following steps: pretreating the surface of the metal base material before thermal spraying, wherein the pretreatment comprises cleaning and decontaminating with alcohol, cleaning floating dust with a brush, blasting sand and blasting, derusting and phosphorylation;
step two: after the surface pretreatment of the metal base material is finished, preheating the metal base material at the preheating temperature of 140-180 ℃;
step three: forming an intermediate transition layer with the thickness of 0.4-0.6 mm on the surface of the preheated metal substrate by adopting laser spraying equipment, wherein the intermediate transition layer is made of NiCr or MCrAlY alloy;
step four: preparing a thermal spraying coating with the thickness of 0.2-0.8 mm on the surface of the transition layer by adopting plasma thermal spraying equipment, wherein the thermal spraying coating is made of nickel-based alloy;
step five: and (3) remelting the thermal spraying coating by adopting a plasma transferred arc remelting technology, and slowly cooling the metal substrate with the thermal spraying coating to room temperature in air after remelting post-treatment is completed.
2. The method for improving the bonding strength of the thermal spray coating and the metal substrate according to claim 1, wherein a laser spraying device is used for forming an intermediate transition layer with the thickness of 0.4-0.6 mm on the surface of the preheated metal substrate, and the method specifically comprises the following steps:
preparing a 0.4-0.6 mm intermediate transition layer on the surface of the preheated metal substrate by adopting laser spraying equipment, wherein the specific parameters of the laser spraying equipment are as follows: the laser power is 3-14kW, the light spot of the laser beam is rectangular, the size of the rectangular light spot is 8-40mm on the long side and 4mm on the short side, the scanning speed of the laser head is 3-800mm/s, and the middle transition layer and the metal base material are in metallurgical bonding.
3. The method for improving the bonding strength of a thermal spray coating and a metal substrate according to claim 1, wherein the control parameters in the remelting post-treatment process of the thermal spray coating by using the plasma transferred arc remelting technique are 80mm/min of the moving speed of a plasma welding gun, 60A of remelting current and 6L/min of plasma gas flow.
4. The method of claim 3, wherein the thermal spray coating is protected with a gas shield during the post-reflow treatment using plasma transferred arc reflow and atmospheric plasma spray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911016231.0A CN110592523A (en) | 2019-10-24 | 2019-10-24 | Method for improving bonding strength of thermal spraying coating and metal substrate |
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| CN201911016231.0A CN110592523A (en) | 2019-10-24 | 2019-10-24 | Method for improving bonding strength of thermal spraying coating and metal substrate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111056400A (en) * | 2019-12-24 | 2020-04-24 | 绍兴顺泰机械科技有限公司 | Wear-resistant elevator safety clamp block |
| CN111549312A (en) * | 2020-05-19 | 2020-08-18 | 江苏科环新材料有限公司 | Method for preparing double-heat-source synergistic remelting through boiler water wall coating |
| CN112251105A (en) * | 2020-09-27 | 2021-01-22 | 广东求精电气有限公司 | Composite material and preparation method thereof |
| CN114959543A (en) * | 2022-05-25 | 2022-08-30 | 苏州热工研究院有限公司 | Thermal spraying strengthening repair method for superficial defects of metal casting part |
| CN115537810A (en) * | 2022-10-14 | 2022-12-30 | 中国兵器装备集团西南技术工程研究所 | Method for preparing composite component based on plasma spraying-laser cladding |
-
2019
- 2019-10-24 CN CN201911016231.0A patent/CN110592523A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111056400A (en) * | 2019-12-24 | 2020-04-24 | 绍兴顺泰机械科技有限公司 | Wear-resistant elevator safety clamp block |
| CN111549312A (en) * | 2020-05-19 | 2020-08-18 | 江苏科环新材料有限公司 | Method for preparing double-heat-source synergistic remelting through boiler water wall coating |
| CN112251105A (en) * | 2020-09-27 | 2021-01-22 | 广东求精电气有限公司 | Composite material and preparation method thereof |
| CN112251105B (en) * | 2020-09-27 | 2021-09-24 | 广东求精电气有限公司 | Composite material and preparation method thereof |
| CN114959543A (en) * | 2022-05-25 | 2022-08-30 | 苏州热工研究院有限公司 | Thermal spraying strengthening repair method for superficial defects of metal casting part |
| CN115537810A (en) * | 2022-10-14 | 2022-12-30 | 中国兵器装备集团西南技术工程研究所 | Method for preparing composite component based on plasma spraying-laser cladding |
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Application publication date: 20191220 |