CN111020561A - High-strength composite coating with alloy fiber structure support and preparation method thereof - Google Patents

High-strength composite coating with alloy fiber structure support and preparation method thereof Download PDF

Info

Publication number
CN111020561A
CN111020561A CN201911152033.7A CN201911152033A CN111020561A CN 111020561 A CN111020561 A CN 111020561A CN 201911152033 A CN201911152033 A CN 201911152033A CN 111020561 A CN111020561 A CN 111020561A
Authority
CN
China
Prior art keywords
composite coating
porous
alloy
sample
coating
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
Application number
CN201911152033.7A
Other languages
Chinese (zh)
Inventor
赵静楠
李子超
聂溪晗
郭健
马晓磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianjin University of Science and Technology
Original Assignee
Tianjin University of Science and Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tianjin University of Science and Technology filed Critical Tianjin University of Science and Technology
Priority to CN201911152033.7A priority Critical patent/CN111020561A/en
Publication of CN111020561A publication Critical patent/CN111020561A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C24/00Coating starting from inorganic powder
    • C23C24/08Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C19/00Alloys based on nickel or cobalt
    • C22C19/07Alloys based on nickel or cobalt based on cobalt

Abstract

The invention relates to a high-strength composite coating with an alloy fiber structure support and a preparation method thereof, belonging to the field of preparation of material surface coatings. The composite coating is a porous anodic aluminum oxide and cladding metal composite coating, alloy powder is heated and melted by laser beams, flows into a porous structure of the aluminum oxide and is metallurgically bonded with a metal base material below the aluminum oxide to form an alloy fiber structure, the alloy fiber structure has a function similar to a reinforced concrete structure, the bonding performance of the composite coating and a base body is obviously improved, and the hardness of the composite coating is enhanced. The method comprises the steps of pretreating a metal matrix; then fixing the porous anodic aluminum oxide on the matrix through a binder; putting the alloy powder ground by the vacuum ball mill into a synchronous powder feeding device; the composite coating is prepared by a laser cladding process. The composite coating prepared by the method has the advantages of simple and convenient production process, lower cost, high surface hardness, high bonding strength with a matrix and the like.

Description

High-strength composite coating with alloy fiber structure support and preparation method thereof
Technical Field
The invention belongs to the field of preparation of material surface coatings, and particularly relates to a high-strength composite coating with an alloy fiber structure support and a preparation method thereof.
Background
The laser cladding technology is a material surface modification technology which adds cladding materials on the surface of a matrix and utilizes high-energy density laser beams to fuse the cladding materials with the surface layer of the matrix, so that a coating with special performance is formed, a more uniform reinforced coating with the thickness of several micrometers to several millimeters can be formed, and the surface performance of the material is improved in a targeted manner. Compared with conventional heat treatment, laser cladding can perform local treatment, and has the advantages of small workpiece deformation, high cooling speed, low alloy element consumption, no need of quenching medium, clean and pollution-free process, easy realization of automation and the like, and has wide application prospect.
In order to improve the surface performance of some precise instruments, a laser cladding technology is adopted to coat a layer of ultrathin coating on the surface of a base material, but the coating obtained by the prior art has low bonding strength with a matrix, is easy to fall off, and influences the service life of the coating. The coating which is prepared by thermal spraying has low bonding strength with a substrate, more gaps, high process cost, difficult control and serious pollution;
the coating prepared by cold spraying is mechanically combined with the substrate, so that the bonding strength is low; coatings prepared by thermochemical reaction methods are not tight enough and have low bonding strength. Compared with the prior art, the coating prepared by adopting the laser cladding technology has the advantages of simple and convenient process, lower cost, environmental protection, no pollution and strong coating bonding performance, the bonding performance is improved mainly from the aspects of changing cladding parameters, powder proportion and the like in the prior art, and the bonding performance of the obtained coating and a matrix is still not ideal.
Disclosure of Invention
The invention aims to provide a high-strength composite coating with an alloy fiber structure support, which is prepared on the surface of a base material, so that the bonding performance of the coating and a matrix is improved, other performances of the coating are improved, and the service life of the coating is prolonged.
Another object of the present invention is to provide a method for preparing the above high strength composite coating with alloy fiber structural support.
The purpose of the invention can be realized by the following technical scheme:
a high strength composite coating with alloy fiber structural support, characterized in that: the surface of the base material is provided with a composite coating, and the raw material of the composite coating consists of a metal matrix, porous anodic alumina and alloy powder.
The thickness of the composite coating is 0.4-1 mm.
The preparation method of the high-strength composite coating with the alloy fiber structure support comprises the following steps,
(1) porous anodized aluminum is placed on the surface of a substrate, and the porous anodized aluminum is bonded on the surface of the substrate by using a bonding agent.
(2) And preheating the part of the base material bonded with the porous anodic aluminum oxide by using high-power laser.
(3) And (3) fully grinding the alloy powder in a vacuum ball mill, and then putting the ground alloy powder into a synchronous powder feeding device.
(4) And (3) adopting a laser cladding technology, scanning laser perpendicular to the surface part of the base material bonded with the porous anodized aluminum in the step (1), synchronously feeding the base material into the alloy powder ground in the step (3), and simultaneously using inert gas as protective gas in the scanning process.
Preferably, the inert gas is argon
In the step (1), the porous anodic alumina has the pore spacing of 400nm-600nm, the pore diameter of 200nm-400nm and the thickness of 15um-25um, and the binder is preferably organic binder.
Further preferably, the organic binder in the step (1) is diacetone alcohol, which is combusted and gasified in the laser cladding process.
The invention has the advantages and positive effects that:
the coating obtained by the preparation method is well metallurgically bonded with a base material, and has the advantages of high bonding strength, high surface hardness, compact and uniform cladding layer tissue, no obvious air holes and cracks and difficult shedding. The preparation method has simple process and low production cost.
Drawings
FIG. 1 is a Scanning Electron Microscope (SEM) photograph of porous anodized aluminum used in the test
FIG. 2 is a schematic diagram of a process for preparing a high-strength composite coating with structural support of alloy fibers
FIG. 3 is a schematic cross-sectional view of the resulting high strength composite coating with structural support of alloy fibers
Detailed Description
The present invention will be further described with reference to the following examples.
A high-strength composite coating with an alloy fiber structure support sequentially comprises a substrate layer, a heat affected zone, a bonding zone and alloy powder from bottom to top, wherein the thickness h4 of the alloy powder is 0.3-0.7mm, the thickness h3 of the bonding zone is 0.2-0.5mm, and the thickness h2 of the heat affected zone is 0.2-2 mm.
Detailed description of the preferred embodiment
The GCr15 bearing steel substrate (the mass fraction percentage of each element, C1.02%, Si 0.25%, Mn0.35%, Cr1.47%, Mo0.02%, S0.006%, P0.013%, and Fe balance) with the size of 40mm x 8mm is ground by 1500-granularity SiC sand paper, and then the surface of the bearing steel substrate is subjected to ultrasonic cleaning for 10min by using ethanol to remove oil stains and oxide scales on the surface and is dried for later use. As sample 1.
The cobalt-base alloy powder is weighed according to the atomic number percentage of C1.5-2%, Cr 30-35%, B0.4-0.6%, Si 1-3%, Ni 2-4%, Co 40-60%, Mo 1-3%, W5-7% and Fe 2-4%, then the cobalt-base alloy powder is uniformly mixed in a ball mill at the rotating speed of 250r/min to obtain the cobalt-base alloy powder with the particle size of 4-8um, and the cobalt-base alloy powder is placed in a powder feeder for standby.
Porous anodized aluminum is placed on the surface of the substrate, and the porous anodized aluminum is bonded on the surface of the substrate by using diacetone alcohol.
A semiconductor laser is adopted, the diameter of a light spot is 3mm, the power P is 600w, and the scanning speed v is 200mn/min to preheat the base body part so as to reduce the temperature gradient.
Cladding the preheated substrate surface in the step (4) by using the laser to prepare a coating, wherein the process parameters are as follows: the laser beam is scanned perpendicular to the surface of the workpiece, the laser power is 1800w, the scanning speed is 600mm/min-800mm/min, the powder feeding rate is 10g/min-15g/min, the overlapping fraction of the parallel tracks is 30%, and argon is used as protective gas for laser cladding. The resulting coated sample was labeled as sample 2.
Only the powder ratio is changed, the alloy powder is weighed according to the atomic number percentage of C1.58%, Cr17.35%, B0.1%, Si 1.1%, Ni 3%, Co 68%, Mo2.0%, W6% and Fe2.1%, and the rest parameters are unchanged, and the preparation process is repeated to obtain a sample 3.
The other parameters were the same as the preparation parameters of sample 2 except that no porous anodic alumina was added, and a coating containing no porous alumina was obtained and labeled as sample 4.
The other parameters were the same as the preparation parameters of sample 3 except that no porous anodic alumina was added, and a coating containing no porous alumina was obtained and labeled as sample 5.
Detailed description of the invention
Grinding 45 steel with the size of 40mm multiplied by 8mm by using SiC abrasive paper with the granularity of 1500, then ultrasonically cleaning the surface of the 45 steel with ethanol for 10min to remove oil stains and oxide skin on the surface, and drying the 45 steel for later use. And was designated as sample 6.
Uniformly mixing nickel-based alloy powder (chemical components with mass fractions of C0.6-1.0%, Cr 14-19%, B2.0-4.0%, Si 3.0-4.5%, Fe less than 13% and Ni the rest) in a ball mill at a rotating speed of 250r/min to obtain nickel-based alloy powder with the particle size of 4-8um, and placing the nickel-based alloy powder in a powder feeder for later use.
Porous anodized aluminum is placed on the surface of the substrate, and the porous anodized aluminum is bonded on the surface of the substrate by using diacetone alcohol.
The same laser as in the first example is used to preheat the substrate part bonded with the porous alumina with the working parameters of the spot diameter of 3mm, the laser power of 600w and the scanning speed of 200mm/min, so as to reduce the temperature gradient.
Cladding the preheated substrate surface by using the laser to prepare a coating, wherein the process parameters are as follows: the laser beam is vertical to the surface of the workpiece to scan, the laser power is 2700w, the scanning speed is 600mm/min-800mm/min, the powder feeding rate is 8g/min-12g/min, the overlapping fraction of the parallel tracks is 30 percent, and argon is used as protective gas. The resulting sample was designated as sample 7.
The powder proportion is changed only, the alloy powder is characterized in that the process is repeated according to the atomic number percentage of C0.6-1.0%, Cr 27-34%, B2.0-4.0%, Si 3.0-4.5%, Fe < 13%, Ni and other parameters, and the sample 8 is obtained.
The other parameters were the same as the preparation parameters of sample 7 except that porous anodic alumina was not added, and a coating layer containing no porous alumina was obtained, and sample 9 was obtained.
Except that the porous anodic alumina was not added, the other parameters were the same as the preparation parameters of sample 8, and a coating layer containing no porous alumina was obtained, and sample 10 was obtained.
The samples are made into small shear samples by using wire cutting, and the prepared sample coating is subjected to a shear experiment by using a shearing method on a hydraulic universal material testing machine so as to measure the bonding strength of the coating and the substrate.
The hardness of each sample was measured in order by using a Vickers hardness tester at a pressure of 2N for a load retention time of 15 s. The 10 sets of data were measured and the maximum and minimum values were removed and averaged.
The wear resistance is measured on a wear machine, the friction coefficient of each sample is directly measured by using an STM-2F pin-disc type friction wear testing machine, the sample is worn for 10min under the condition of 10N load and 200r/min rotating speed, and the wear loss of the sample is measured by using a weighing method.
The performance parameters of each sample are shown in Table I
Watch 1
As can be seen from table one, the overall performance of the coated samples after laser cladding is greatly improved compared to the base material (sample 2, sample 3, sample 4 and sample 5 compared to sample 1, sample 7, sample 8, sample 9 and sample 10 compared to sample 6). In contrast, the porous alumina coated samples were significantly improved in terms of bond strength, coating surface hardness, etc. compared to the coated samples prepared without the addition of porous alumina (sample 2 compared to sample 4, sample 3 compared to sample 5, sample 7 compared to sample 9, and sample 8 compared to sample 10). Finally, the preparation process parameters of sample 2 are preferably optimized.
From the microstructure, the dilution rate of the coating added with the porous alumina is lower, and due to the existence of the porosity of the alumina, the crystal grains of the bonding area are more compact and uniform and are mostly arranged in the vertical direction, which may be the reason for higher hardness and higher bonding strength of the coating containing the porous alumina.
Because the cobalt-based alloy has good thermal stability and good wettability when being melted, the cobalt-based alloy is uniformly spread between the matrix and the porous alumina, so that good bonding strength is obtained, and the compactness of the coating is improved. And because Co and C generate stable solid solution and carbide such as CrC and boride such as CrB are dispersed and distributed, the comprehensive mechanical property of the coating containing the cobalt-based alloy is better than that of the nickel-based alloy coating.
The above description is exemplary of the present invention, but the present invention should not be limited to the disclosure of the embodiment. Therefore, it is intended that all equivalents and modifications which do not depart from the spirit of the invention disclosed herein are deemed to be within the scope and spirit of the invention.

Claims (3)

1. A high strength composite coating with alloy fiber structural support, characterized in that: the surface of the base material is provided with a composite coating, and the raw materials for preparing the composite coating consist of a metal matrix, porous anodic alumina and alloy powder.
2. A high strength composite coating with alloy fiber structural support according to claim 1, characterized in that: the bonding region of the composite coating contains porous alumina, and vertically grown alloy fibers exist in the porous structure of the composite coating.
3. The preparation method of the nano-alloy fiber supported high-strength composite coating layer according to claim 1 or 2 comprises the following steps,
(1) the porous anodized aluminum is placed on the surface of the substrate, and the porous anodized aluminum is bonded to the surface of the substrate by using a bonding agent.
(2) And preheating the part of the base material bonded with the porous anodic aluminum oxide by using high-power laser.
(3) And (3) fully grinding the alloy powder in a vacuum ball mill, and then putting the ground alloy powder into a powder bin.
(4) And (2) adopting a laser cladding technology, scanning the laser perpendicular to the part, bonded with the porous anodized aluminum, on the substrate in the step (1) and synchronously feeding the part into the alloy powder ground in the step (3), wherein inert gas is used as protective gas in the scanning process.
(5) The method for preparing a high-strength composite coating with an alloy fiber structure support according to claim 3, wherein in the step (1), the porous anodic aluminum oxide has a pore spacing of 400nm-600nm, a pore diameter of 200nm-400nm and a thickness of 15um-25 um.
CN201911152033.7A 2019-11-22 2019-11-22 High-strength composite coating with alloy fiber structure support and preparation method thereof Pending CN111020561A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911152033.7A CN111020561A (en) 2019-11-22 2019-11-22 High-strength composite coating with alloy fiber structure support and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911152033.7A CN111020561A (en) 2019-11-22 2019-11-22 High-strength composite coating with alloy fiber structure support and preparation method thereof

Publications (1)

Publication Number Publication Date
CN111020561A true CN111020561A (en) 2020-04-17

Family

ID=70206358

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911152033.7A Pending CN111020561A (en) 2019-11-22 2019-11-22 High-strength composite coating with alloy fiber structure support and preparation method thereof

Country Status (1)

Country Link
CN (1) CN111020561A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112458519A (en) * 2020-11-06 2021-03-09 安徽鑫发铝业有限公司 Preparation method of anti-corrosion electrophoresis extinction aluminum profile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112458519A (en) * 2020-11-06 2021-03-09 安徽鑫发铝业有限公司 Preparation method of anti-corrosion electrophoresis extinction aluminum profile

Similar Documents

Publication Publication Date Title
CN102650012B (en) Special cobalt-based metal ceramic alloy powder for optical fiber laser cladding
Wang et al. Microstructure and formation mechanism of in-situ TiC-TiB2/Fe composite coating
CN102962447B (en) A kind of method of titanium carbide ceramic powder and this powder of laser melting coating
Amado et al. Crack free tungsten carbide reinforced Ni (Cr) layers obtained by laser cladding
CN109943844B (en) Ultrahigh-hardness laser cladding composite coating material and preparation method thereof
CN111020561A (en) High-strength composite coating with alloy fiber structure support and preparation method thereof
CN110144582B (en) Metal-based material for preparing crystallizer or tuyere and preparation method thereof
CN211814644U (en) High-strength composite coating with alloy fiber structure support
CN108517518B (en) Preparation method of composite coating for improving high-temperature oxidation resistance of titanium alloy
RU2418074C1 (en) Procedure for strengthening items out of metal materials for production of nano structured surface layers
Shen et al. Interfacial characteristics of titanium coated micro-powder diamond abrasive tools fabricated by electroforming-brazing composite process
CN110524082A (en) Using Fe as the method for carbon fiber in active element quick humidification ceramic matric composite
CN100547114C (en) A kind of on the metallic surface method of fusing and coating high-hardness tungsten carbide coat
CN108220957B (en) Titanium alloy surface high-temperature-resistant coating and preparation method thereof
CN104607631B (en) Powder and preparation technology used in a kind of copper single element based alloy laser high-entropy alloy
Hebbale Microstructural characterization of Ni based cladding on SS-304 developed through microwave energy
Macwan et al. Residual stresses in suspension plasma sprayed electrolytes in metal-supported solid oxide fuel cell half cells
CN111636063A (en) Electron beam cladding method for enhancing surface performance of aluminum alloy matrix
Yang et al. Influence of molybdenum on the microstructure and mechanical properties of TiC-TiB 2 reinforced metal matrix composite coatings
CN107099796B (en) A kind of titanium-based laser cladding coating and preparation method thereof
CN103409747A (en) Method for preparing Ni-based WC hard alloy coating and inhibiting cracks and air holes therein
Dobrzański et al. Laser treatment of the surface layer of 32CrMoV12-28 and X40CrMoV5-1 steels
CN108359973A (en) A kind of silicide laser cladding coating material and preparation method thereof
CN110527930B (en) Iron-based amorphous laser cladding coating material and preparation method thereof
CN110499506B (en) High-toughness high-temperature self-lubricating nickel-based wear-resistant composite layer, preparation method and application

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication