CN115287577B - High-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire and application thereof - Google Patents
High-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire and application thereof Download PDFInfo
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- 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
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Abstract
The invention relates to a high wear-resistant iron-based amorphous high-speed electric arc spraying powder core wire and application thereof, wherein the powder core wire consists of a coating layer and a powder core, and the formula of the powder core comprises the following components in percentage by mass: mn: 10-15%; cr: 8-15%; ni:1 to 5 percent; b: 6-10%; nb:1 to 3 percent; the balance of Fe; the high wear-resistant iron-based powder core wire has stronger amorphous forming capability, and an amorphous coating with the thickness of 0.2-2 mm of critical amorphous forming size can be obtained by a high-speed electric arc spraying technology; the coating layer is 308 stainless steel strips; the powder core is rolled into powder core wires according to the proportion of the raw materials in the formula and applied to the coating, namely the coating is prepared on a 17CrNiMo6 steel matrix by adopting the powder core wires through a high-speed electric arc spraying technology, so that a continuous and compact amorphous coating is obtained, the amorphous coating has good mechanical property, wear resistance and corrosion resistance, and the amorphous coating has low porosity and high hardness.
Description
Technical Field
The invention relates to the technical field of composite materials and material processing engineering, and relates to a high-wear-resistance iron-based amorphous high-speed arc spraying powder core wire and application thereof.
Background
Wear is one of the main failure modes of mechanical parts and engineering components, and the economic loss caused by the wear is very large. With the rapid development of industrial technology and the continuous improvement of mechanical and automatic degrees, the damage caused by the abrasion of mechanical equipment and parts is more and more emphasized. As a novel material, the amorphous material has no defects of grain boundary, dislocation and the like due to a long-range disordered and short-range ordered structure, so that the amorphous material generally has the advantages of higher strength, hardness, good wear resistance, corrosion resistance and the like.
The FeCrBSiWMnNb amorphous coating is successfully prepared by utilizing an electric arc spraying technology by utilizing the Nanostel, boride and carbide with the size of 60-140nm are distributed on an amorphous phase matrix at intervals, and the Vickers hardness of the coating is 889-905 HV 0.3 The bonding strength is 35 to 48MPa (Advanced materials)&Processes, 2006, 164 (8): 68-69). Guo Jinhua and the like, the FeCrMoMnBCSi alloy coating with the amorphous content of 45.22 percent is prepared by an electric arc spraying method, the porosity of the coating is 2.59 percent, the Vickers hardness exceeds HV1000, and the coating has good corrosion resistance (metal theory report 2007,43 (7): 780-784). Liang Xiubing et al (journal of the engineering college of armor engineering): 2009 (05): 77-81) prepared FeCrBSiMnNbY amorphous nanocrystalline coatings by arc spraying, the texture of the coating consisted of an amorphous phase and an alpha-Fe nanocrystalline phase, the nanocrystalline grain average size was 32nm, and the porosity was about 1.7%. A self-made Fe-based powder core wire is adopted by Beijing university of industry, and a coating containing an amorphous structure is prepared by electric arc spraying, wherein the amorphous phase content is 55.3 percent (tribology report 2008,28 (5): 428-432.). The iron-based coating with the amorphous content of 29 percent is prepared by arc spraying technology in the university of the fertilizer combination industry, and the porosity of the coating is relatively high (electric welding machine 2015,45 (8): 210-213). Tian Haoliang et al report on materials science and technology (2012 20 (1): 108-113) that FeAlNbB amorphous nanocrystalline coatings were prepared using high-speed arc spraying techniques with an amorphous phase content of about 36.2% and an average porosity of about 2.3%; the wear resistance of the coating is 2.2 times that of a 3Cr13 coating prepared under the same experimental conditions. However, the existing iron-based amorphous alloy has large preparation difficulty, high cost or amorphous phase content of the systemThe amorphous material has poor wear resistance due to low content.
Disclosure of Invention
The invention aims to solve the technical problems of providing a high-wear-resistance iron-based amorphous high-speed arc spraying powder core wire and application thereof, which can effectively improve the wear resistance of the iron-based amorphous high-speed arc spraying powder core wire, and a wire coating prepared on a 17CrNiMo6 steel substrate by adopting the high-wear-resistance iron-based amorphous high-speed arc spraying powder core wire in a high-speed arc spraying mode can form a continuous and compact spraying coating, and the coating has low porosity, high hardness, high bonding strength, good mechanical property, wear resistance and corrosion resistance.
In order to solve the technical problems, the invention adopts the following technical scheme: the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire consists of a coating layer and a powder core, wherein the formula of the powder core comprises the following components in percentage by mass: mn: 10-15%; cr: 8-15%; ni:1 to 5 percent; b: 6-10%; nb:1 to 3 percent; the balance of Fe; the high wear-resistant iron-based powder core wire has stronger amorphous forming capability, and an amorphous coating with the thickness of 0.2-2 mm of critical amorphous forming size can be obtained by a high-speed electric arc spraying technology;
the preparation method of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire comprises the following steps:
s1: weighing Mn powder, cr powder, ni powder, B powder, nb powder and Fe powder according to the proportion for later use;
s2: mixing Mn powder, cr powder, ni powder, B powder, nb powder and Fe powder, and uniformly mixing in a mixer to obtain powder core mixed powder;
s3: sieving the mixed powder of the powder cores to obtain powder core powder;
s4: and (3) filling the powder core powder in the step (S3) into a coating layer, closing the coating layer to enable the coating layer to coat the powder core powder, feeding the powder core powder into a wire drawing die, and carrying out drawing and reducing on a channel-by-channel basis to obtain the powder core wire.
By adopting the technical scheme, the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire with better mechanical property, wear resistance and corrosion resistance is obtained through the performance coordination effect of Mn, cr, ni, B, nb and Fe powder, and the amorphous coating can be prepared by using the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire. Currently, the preparation of amorphous alloys is mainly based on the following principles: (1) Multicomponent alloy composed of three or more elements, the composition of which is close to deep eutectic; (2) the atomic radius difference of the elements between the components is more than 12%; (3) the negative mixing enthalpy between the main components is relatively large. The guidelines for designing and preparing amorphous alloys are therefore to first find alloy compositions with deep eutectic crystals, which form liquids that are stable at relatively low temperatures, while selecting multicomponent elements with large size differences, which lead to increased complexity and size of the crystal lattice and reduced energy barrier for forming intermetallic compounds; the Fe content in the crust is higher, and the Fe-based alloy has excellent wear resistance and is suitable for preparing a surface strengthening coating in a severe environment; mn is an element for stabilizing austenite in a ferro-manganese system, has strong work hardening capacity, and improves wear resistance; cr effectively improves the rigidity, strength and wear resistance of the system; the addition of Ni improves the amorphous thermal stability and is beneficial to improving the toughness of the coating; in the technical scheme, the addition of B and Nb changes the crystal form of the high-wear-resistance iron-based powder core wire, and an amorphous phase is obtained through a high-speed electric arc spraying technology, so that an amorphous coating is obtained, wherein B is used as a metalloid element, has smaller atomic size, can increase the negative mixing enthalpy among components, reduces the critical cooling speed of the amorphous alloy, and is beneficial to the formation of the amorphous phase; nb, an element having a large atomic size, can increase the difference in atomic radius between the components, improve the glass forming ability of the system, and widen the amorphous forming range.
As a preferable technical scheme of the present invention, the coating layer is 308 stainless steel strips, and the step S4 specifically includes: binding a stainless steel belt into a U shape, and filling the powder core powder obtained in the step S3 into the U shape; and closing the U-shaped stainless steel belt, coating the powder core powder, feeding the powder core powder into a wire drawing die, and drawing and reducing the diameter one by one to obtain the powder core wire.
As a preferable technical scheme of the present invention, in the step S4, the U-shaped 308 stainless steel band is closed to cover the powder core powder, so that the powder core powder passes through the following diameters respectively in sequence: drawing the powder core wire materials by drawing the powder core wire materials one by a wire drawing die with the diameter of 3.0mm, 2.6mm, 2.4mm, 2.2mm and 2.0 mm.
As a preferable technical scheme of the invention, in the step S4, a 308 stainless steel belt with the width of 12mm and the thickness of 0.3mm is bundled into a U shape, and then the obtained powder core powder is filled into the U-shaped stainless steel belt according to the filling rate of 28-32 percent.
As a preferable technical scheme of the invention, the diameter of the cored wire obtained in the step S4 is 2mm.
As a preferable technical scheme of the invention, the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire is applied to the preparation of a powder core wire amorphous coating, and the preparation method specifically comprises the following steps:
(1) Pretreatment is carried out on the surface of a substrate: removing stains and oil stains on the surface of the matrix by adopting absolute ethyl alcohol or acetone, and then carrying out sand blasting roughening treatment on the surface of the matrix by using iron sand;
(2) Preparing a coating: adopting a high-speed electric arc spraying technology to spray the powder core wire material on the pretreated base material to prepare a coating, wherein the spraying technological parameters are as follows: air pressure: 0.6-0.7 MPa, spraying voltage: 34-38V, spraying current: 190-210A, spraying distance: 180-220 mm; and (3) adopting an intermittent spraying method, and repeatedly spraying for 6-8 times to obtain the coating of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire, wherein the coating of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire is an amorphous coating. The purpose of the pretreatment of the surface of the matrix is to remove rust matters on the surface of the matrix, form a uniform uneven rough surface on the surface of the matrix, improve the adhesive force of the coating, and apply the powder core wire on the prepared coating by a high-speed electric arc spraying technology, so that the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire coating, namely FeMnCrNiBNb amorphous coating, can be obtained.
As a preferable scheme of the invention, the matrix in the step (1) is a 17CrNiMo6 steel matrix; the iron sand treated by sand blasting coarsening is 16-18 meshes.
As a preferable scheme of the invention, the thickness of the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire coating obtained in the step (2) is 0.4-0.7 mm.
As a preferable scheme of the invention, the coating porosity of the high wear-resistant iron-based amorphous high-speed arc spraying powder core obtained in the step (2) is less than or equal to 1.5%, the bonding strength is more than or equal to 45MPa, and the Vickers hardness is 1400HV 0.1 -1500HV 0.1 。
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the B and Nb are added into the formula of the wear-resistant iron-based powder core wire, so that the crystal form of the high wear-resistant iron-based powder core wire is changed, the formed powder core wire has stronger amorphous forming capability, namely, the amorphous forming capability of the powder core wire is improved, and an amorphous phase coating is obtained through a high-speed electric arc spraying technology, namely, the high-speed electric arc spraying technology is adopted to prepare the coating, and a continuous and compact FeMnCrNiBNb amorphous coating is formed on a steel substrate;
(2) By adjusting the types of the added atoms and the proportion among the atoms, the atoms have larger degree of atom mismatch, which can lead to the reduction of the free volume of the system, obstruct the diffusion of elements and improve the amorphous forming capability and stability of the system;
(3) The high-speed electric arc spraying technology adopted by the invention is simple to operate, the spraying material is convenient and economic to prepare, the advantages of in-situ large-area spraying and the like can be realized, and compared with other spraying modes, the cost is lowest; the obtained coating with excellent mechanical property and wear resistance, which is prepared by spraying powder on the core wire by high-speed electric arc spraying with high wear resistance and iron-based amorphous powder, is suitable for parts working under severe working conditions such as severe wear, is easy to industrialize and has wide application prospect;
(4) The amorphous coating prepared on the substrate by adopting a high-speed electric arc spraying technology has the porosity less than or equal to 1.5 percent, the bonding strength more than or equal to 45MPa and the Vickers hardness of 1400HV 0.1 -1500HV 0.1 ；
(5) The alloy powder added in the cored wire has low price and lower cost.
Drawings
FIG. 1 is a surface SEM topography of FeMnCrNiBNb amorphous coating of example 1 of the present invention;
FIG. 2 is a cross-sectional SEM topography of FeMnCrNiBNb amorphous coating of example 1 of the present invention;
FIG. 3 is the EDS element plane distribution result of the FeMnCrNiBNb amorphous coating cross section of the specific example 1 of the present invention;
FIG. 4 is a surface XRD characterization of FeMnCrNiBNb amorphous coating of embodiment 1 of the present invention.
Detailed Description
The present invention will be further described in detail with reference to the drawings and examples, which are only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Examples: the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire consists of a coating layer and a powder core, wherein the formula of the powder core wire comprises the following components in percentage by mass: 10-15%; cr: 8-15%; ni:1 to 5 percent; b: 6-10%; nb:1 to 3 percent; the balance of Fe; the high wear-resistant iron-based powder core wire has stronger amorphous forming capability, and an amorphous coating with the thickness of 0.2-2 mm of critical amorphous forming size can be obtained by a high-speed electric arc spraying technology; the coating is 308 stainless steel band.
The preparation method of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire comprises the following steps:
s1: weighing Mn, cr, ni, B, nb and Fe powder according to a proportion;
s2: mn, cr, ni, B, nb and Fe powder are mixed and uniformly mixed in a mixer to obtain amorphous mixed powder;
s3: sieving the mixed powder with 100 meshes to obtain powder core powder;
s4: binding a stainless steel belt into a U shape, and filling the powder core powder obtained in the step S3 into the U-shaped stainless steel belt; then closing the U-shaped stainless steel belt, coating the powder core powder, then sending the powder core powder into a wire drawing die, and drawing and reducing the diameter one by one to obtain a powder core wire; specifically, in the step S4, a 308 stainless steel belt with the width of 12mm and the thickness of 0.3mm is bundled into a U shape in the step S4, and then the obtained powder core powder is filled into the U-shaped stainless steel belt according to the filling rate of 28% -32%; and closing the U-shaped 308 stainless steel belt to cover the powder core powder, so that the powder core powder passes through the following diameters respectively in sequence: drawing and reducing the wire by a wire drawing die of 3.0mm, 2.6mm, 2.4mm, 2.2mm and 2.0mm to obtain a cored wire; the diameter of the obtained cored wire was 2mm.
The high wear-resistant iron-based amorphous high-speed arc spraying powder core wire is applied to the preparation of a powder core wire amorphous coating, and the preparation method specifically comprises the following steps:
(1) Pretreatment is carried out on the surface of a substrate: removing stains and oil stains on the surface of the matrix by adopting absolute ethyl alcohol or acetone, and then carrying out sand blasting roughening treatment on the surface of the matrix by using iron sand; the purpose of the pretreatment of the surface of the matrix is to remove rust matters on the surface of the matrix, and to form a uniform rough surface on the surface of the matrix, so as to improve the adhesive force of the coating; the matrix in the step (1) is a 17CrNiMo6 steel matrix; the iron sand subjected to sand blasting coarsening treatment is 16-18 meshes;
(2) Preparing a coating: adopting a high-speed electric arc spraying technology to spray the powder core wire material on the pretreated base material to prepare a coating, wherein the spraying technological parameters are as follows: air pressure: 0.6-0.7 MPa, spraying voltage: 34-38V, spraying current: 190-210A, spraying distance: 180-220 mm; adopting an intermittent spraying method, and repeatedly spraying for 6-8 times to obtain a coating of the high-wear-resistance iron-based amorphous high-speed arc spraying powder core wire; the thickness of the coating of the obtained high wear-resistant iron-based amorphous high-speed electric arc spraying powder core wire is 0.4-0.7 mm; the porosity of the coating of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core obtained in the step (2) is less than or equal to 1.5%, the bonding strength is more than or equal to 45MPa, and the Vickers hardness is 1400HV 0.1 -1500HV 0.1 。
Specific example 1:
the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire consists of a coating layer and a powder core, wherein the formula of the powder core wire comprises the following components in percentage by mass: 15% Mn, 8% Cr, 5% Ni, 6%B, 1% Nb; the balance of Fe; the high wear-resistant iron-based powder core wire has stronger amorphous forming capability, and an amorphous coating with the thickness of 0.2-2 mm of critical amorphous forming size can be obtained by a high-speed electric arc spraying technology; the coating is 308 stainless steel band.
The preparation method of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire comprises the following steps:
s1: weighing Mn, cr, ni, B, nb and Fe powder according to a proportion;
s2: mn, cr, ni, B, nb and Fe powder are mixed and uniformly mixed in a mixer to obtain amorphous mixed powder;
s3: sieving the mixed powder with 100 meshes to obtain powder core powder;
s4: binding a stainless steel belt into a U shape, and filling the powder core powder obtained in the step S3 into the U-shaped stainless steel belt; then closing the U-shaped stainless steel belt, coating the powder core powder, then sending the powder core powder into a wire drawing die, and drawing and reducing the diameter one by one to obtain a powder core wire; specifically, in the step S4, a 308 stainless steel belt with the width of 12mm and the thickness of 0.3mm is bundled into a U shape in the step S4, and then the obtained powder core powder is filled into the U-shaped stainless steel belt according to the filling rate of 28%; and closing the U-shaped 308 stainless steel belt to cover the powder core powder, so that the powder core powder passes through the following diameters respectively in sequence: drawing and reducing the wire by a wire drawing die of 3.0mm, 2.6mm, 2.4mm, 2.2mm and 2.0mm to obtain a cored wire; the diameter of the obtained cored wire was 2mm.
The high wear-resistant iron-based amorphous high-speed arc spraying powder core wire is applied to the preparation of a powder core wire amorphous coating, and the preparation method specifically comprises the following steps:
(1) Pretreatment is carried out on the surface of a substrate: removing stains and oil stains on the surface of the matrix by adopting absolute ethyl alcohol or acetone, and then carrying out sand blasting roughening treatment on the surface of the matrix by using iron sand; the purpose of the pretreatment of the surface of the matrix is to remove rust matters on the surface of the matrix, and to form a uniform rough surface on the surface of the matrix, so as to improve the adhesive force of the coating; the matrix in the step (1) is a 17CrNiMo6 steel matrix; the iron sand subjected to sand blasting coarsening treatment is 16-18 meshes;
(2) Preparing a coating: adopting a high-speed electric arc spraying technology to spray the powder core wire material on the pretreated base material to prepare a coating, wherein the spraying technological parameters are as follows: air pressure: 0.6MPa, spraying voltage: 38V, spraying current: 190A, spray distance: 220mm; adopting an intermittent spraying method, and repeatedly spraying for 6 times to obtain a coating (FeMnCrNiBNb amorphous coating) of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire; the thickness of the obtained amorphous wire coating (FeMnCrNiBNb amorphous coating) is 0.4-0.5 mm.
Comparative example 1:
the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire of the comparative example 1 consists of a coating layer and a powder core, wherein the coating layer is a 308 stainless steel belt, and the filling rate of the powder core is 28%; the powder core wire material comprises the following substances in percentage by mass: 15% Mn, 8% Cr, 5% Ni, 6%B, 1% Nb; the balance of Fe; the preparation method of the high wear-resistant iron-based amorphous high-speed arc spraying cored wire of the embodiment 1 is adopted for rolling into cored wires.
Preparing a coating on the 17CrNiMo6 steel matrix subjected to oil removal, rust removal, sand blasting and coarsening by using the powder core wire prepared by the proportion of the powder core wire through a high-speed electric arc spraying method, wherein the used technological parameters are as follows: air pressure: 0.45MPa, spraying voltage: 32V, spraying current: 170A, spraying distance: 150mm; and (3) adopting an intermittent spraying method, and repeatedly spraying for 6 times to obtain the coating (FeMnCrNiBNb amorphous coating) of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire.
Specific example 2:
the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire consists of a coating layer and a powder core, wherein the formula of the powder core wire comprises the following components in percentage by mass: 13% Mn, 12% Cr, 3% Ni, 8% B, 2% Nb and the balance Fe; the high wear-resistant iron-based powder core wire has stronger amorphous forming capability, and an amorphous coating with the thickness of 0.2-2 mm of critical amorphous forming size can be obtained by a high-speed electric arc spraying technology; the coating is 308 stainless steel band.
The preparation method of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire comprises the following steps:
s1: weighing Mn, cr, ni, B, nb and Fe powder according to a proportion;
s2: mn, cr, ni, B, nb and Fe powder are mixed and uniformly mixed in a mixer to obtain amorphous mixed powder;
s3: sieving the mixed powder with 100 meshes to obtain powder core powder;
s4: binding a stainless steel belt into a U shape, and filling the powder core powder obtained in the step S3 into the U-shaped stainless steel belt; then closing the U-shaped stainless steel belt, coating the powder core powder, then sending the powder core powder into a wire drawing die, and drawing and reducing the diameter one by one to obtain a powder core wire; specifically, in the step S4, a 308 stainless steel belt with the width of 12mm and the thickness of 0.3mm is bundled into a U shape in the step S4, and then the obtained powder core powder is filled into the U-shaped stainless steel belt according to the filling rate of 30%; and closing the U-shaped 308 stainless steel belt to cover the powder core powder, so that the powder core powder passes through the following diameters respectively in sequence: drawing and reducing the wire by a wire drawing die of 3.0mm, 2.6mm, 2.4mm, 2.2mm and 2.0mm to obtain a cored wire; the diameter of the obtained cored wire was 2mm.
The high wear-resistant iron-based amorphous high-speed arc spraying powder core wire is applied to the preparation of a powder core wire amorphous coating, and the preparation method specifically comprises the following steps:
(1) Pretreatment is carried out on the surface of a substrate: removing stains and oil stains on the surface of the matrix by adopting absolute ethyl alcohol or acetone, and then carrying out sand blasting roughening treatment on the surface of the matrix by using iron sand; the purpose of the pretreatment of the surface of the matrix is to remove rust matters on the surface of the matrix, and to form a uniform rough surface on the surface of the matrix, so as to improve the adhesive force of the coating; the matrix in the step (1) is a 17CrNiMo6 steel matrix; the iron sand subjected to sand blasting coarsening treatment is 16-18 meshes;
(2) Preparing a coating: adopting a high-speed electric arc spraying technology to spray the powder core wire material on the pretreated base material to prepare a coating, wherein the spraying technological parameters are as follows: air pressure: 0.65MPa, spraying voltage: 36V, spraying current: 200A, spraying distance: 200mm; adopting an intermittent spraying method, and repeatedly spraying for 7 times to obtain a coating of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire; the thickness of the coating (FeMnCrNiBNb amorphous coating) of the obtained high wear-resistant iron-based amorphous high-speed arc spraying powder core wire is 0.5-0.6 mm.
Comparative example 2:
the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire of the comparative example 2 consists of a coating layer and a powder core, wherein the coating layer is a 308 stainless steel belt, and the filling rate of the powder core is 28%; the powder core is prepared from the following substances in percentage by mass: 13% Mn, 12% Cr, 3% Ni, 8% B, 2% Nb and the balance Fe; the preparation method of the high wear-resistant iron-based amorphous high-speed arc spraying cored wire of the embodiment 2 is adopted for rolling into cored wires.
Preparing a coating on the 17CrNiMo6 steel matrix subjected to oil removal, rust removal, sand blasting and coarsening by using the powder core wire prepared by the proportion of the powder core wire through a high-speed electric arc spraying method, wherein the used technological parameters are as follows: air pressure: 0.55MPa, spraying voltage: 36V, spraying current: 230A, spraying distance: 150mm; and (3) adopting an intermittent spraying method, and repeatedly spraying for 7 times to obtain the coating (FeMnCrNiBNb amorphous coating) of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire.
Specific example 3:
the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire consists of a coating layer and a powder core, wherein the formula of the powder core wire comprises the following components in percentage by mass: 10% Mn, 15% Cr, 1% Ni, 10% B, 3% Nb; the balance of Fe; the high wear-resistant iron-based powder core wire has stronger amorphous forming capability, and an amorphous coating with the thickness of 0.2-2 mm of critical amorphous forming size can be obtained by a high-speed electric arc spraying technology; the coating is 308 stainless steel band. The preparation method of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire comprises the following steps:
s1: weighing Mn, cr, ni, B, nb and Fe powder according to a proportion;
s2: mn, cr, ni, B, nb and Fe powder are mixed and uniformly mixed in a mixer to obtain amorphous mixed powder;
s3: sieving the mixed powder with 100 meshes to obtain powder core powder;
s4: binding a stainless steel belt into a U shape, and filling the powder core powder obtained in the step S3 into the U-shaped stainless steel belt; then closing the U-shaped stainless steel belt, coating the powder core powder, then sending the powder core powder into a wire drawing die, and drawing and reducing the diameter one by one to obtain a powder core wire; specifically, in the step S4, a 308 stainless steel belt with the width of 12mm and the thickness of 0.3mm is bundled into a U shape in the step S4, and the obtained powder core powder is filled into the U-shaped stainless steel belt according to the filling rate of 32%; and closing the U-shaped 308 stainless steel belt to cover the powder core powder, so that the powder core powder passes through the following diameters respectively in sequence: drawing and reducing the wire by a wire drawing die of 3.0mm, 2.6mm, 2.4mm, 2.2mm and 2.0mm to obtain a cored wire; the diameter of the obtained cored wire was 2mm.
The high wear-resistant iron-based amorphous high-speed arc spraying powder core wire is applied to the preparation of a powder core wire amorphous coating, and the preparation method specifically comprises the following steps:
(1) Pretreatment is carried out on the surface of a substrate: removing stains and oil stains on the surface of the matrix by adopting absolute ethyl alcohol or acetone, and then carrying out sand blasting roughening treatment on the surface of the matrix by using iron sand; the purpose of the pretreatment of the surface of the matrix is to remove rust matters on the surface of the matrix, and to form a uniform rough surface on the surface of the matrix, so as to improve the adhesive force of the coating; the matrix in the step (1) is a 17CrNiMo6 steel matrix; the iron sand subjected to sand blasting coarsening treatment is 16-18 meshes;
(2) Preparing a coating: adopting a high-speed electric arc spraying technology to spray the powder core wire material on the pretreated base material to prepare a coating, wherein the spraying technological parameters are as follows: air pressure: 0.7MPa, spraying voltage: 34V, spraying current: 210A, spray distance: 180mm; adopting an intermittent spraying method, and repeatedly spraying for 8 times to obtain a coating (FeMnCrNiBNb amorphous coating) of the high-wear-resistance iron-based amorphous high-speed arc spraying powder core wire; the thickness of the obtained wire coating (FeMnCrNiBNb amorphous coating) is 0.6-0.7 mm.
Comparative example 3:
the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire of the comparative example 3 consists of a coating layer and a powder core, wherein the coating layer is a 308 stainless steel belt, and the filling rate of the powder core is 28%; the powder core wire material comprises the following substances in percentage by mass: 10% Mn, 15% Cr, 1% Ni, 10% B, 3% Nb and the balance Fe; the preparation method of the high wear-resistant iron-based amorphous high-speed arc spraying cored wire of the embodiment 3 is adopted for rolling into cored wires.
Preparing a coating on the 17CrNiMo6 steel matrix subjected to oil removal, rust removal, sand blasting and coarsening by using the powder core wire prepared by the proportion of the powder core wire through a high-speed electric arc spraying method, wherein the used technological parameters are as follows: air pressure: 0.65MPa, spraying voltage: 40V, spraying current: 170A, spraying distance: 250mm; and (3) adopting an intermittent spraying method, and repeatedly spraying for 8 times to obtain the coating (FeMnCrNiBNb amorphous coating) of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire.
Composition, structure and performance characterization:
(1) And (3) composition and structure analysis:
1) Scanning electron microscope and EDS analysis: the coatings (FeMnCrNiBNb amorphous coatings) of the high wear-resistant iron-based amorphous high-speed arc spraying powder core wires obtained in the examples 1-3 and the comparative examples 1-3 are subjected to scanning electron microscope analysis, and the same morphology is obtained. Fig. 1 shows SEM morphology of the coating layer (femncronib amorphous coating layer) of the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire of example 1, and it can be seen from fig. 1 that the surface of the coating layer (femncronib amorphous coating layer) of the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire shows a state of a flat area after obvious droplet spreading. Fig. 2 shows the cross-sectional morphology of the coating (femncronib amorphous coating) of the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire of example 1, and as can be seen from fig. 2, the coating has a uniform structure and a compact structure, the porosity of the coating is 1.15% by gray scale analysis, and the coating of the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire is tightly mechanically engaged with a substrate, and the combination is good. As shown in fig. 3, as can be seen from the EDS element surface distribution scanning result of the amorphous coating (femncronibnb amorphous coating), the coating of the prepared high wear-resistant iron-based amorphous high-speed arc spraying powder core wire mainly consists of Fe, mn, cr, ni, B, nb total 6 main elements, and as can be seen from the distribution map, the Fe, mn, cr, ni, nb detection amount is large, wherein the B element is difficult to detect due to the smaller atomic number, so that the detection result shows less; but the addition of B and Nb elements enhances the amorphous forming ability of the coating.
2) XRD characterization analysis: fig. 4 is an XRD pattern of the surface of the arc spray coating of example 1, and as can be seen from fig. 4, a diffuse scattering peak appears at 2θ=44°, which is an XRD pattern of a typical amorphous structure, illustrating that the powder core wire coating forms an amorphous structure during deposition; no reflection peaks corresponding to the crystalline phases are found in fig. 4, indicating that the prepared cored wire coating is amorphous; the FeMnCrNiBNb component meets the main principle of preparing amorphous alloy: (1) Multicomponent alloy composed of three or more elements, the composition of which is close to deep eutectic; (2) the atomic radius difference of the elements between the components is more than 12%; (3) the negative mixing enthalpy between the main components is relatively large. The addition of the B element and the Nb element not only can increase the atomic radius difference between the components, but also can increase the negative mixing enthalpy between the components, reduce the critical cooling speed of the amorphous alloy, improve the glass forming capability of the system and widen the amorphous forming range. In addition, the XRD pattern of FIG. 4 shows no oxide peaks present, demonstrating that the coating rarely oxidizes during deposition.
(2) Performance test: performance tests included porosity, hardness, wear rate. The coatings prepared in examples 1-3 and comparative examples 1-3 were subjected to gray scale test to calculate the porosity of the coating using ImageJ software, 10 areas were selected for each example for calculation, and the average value was obtained; the hardness of the coating is measured by a Duramin-40A1 microhardness meter, the load is 100g, and the loading time is 15s; the frictional wear performance of the coating is tested by using a CFT-I type material surface performance comprehensive tester, and the abrasive piece is Si with the diameter of 4mm 3 N 4 Load 6N, reciprocating speed 900t/min, test time 30min and reciprocating stroke 4mm; the tensile bond strength of the FeMnCrNiBNb amorphous coating is measured by adopting a tensile method, E-7 glue is selected as a binder, and a DDL100 type electronic universal tester is used for testing at the speed of 1 mm/min. The performance test data for the coating of the high wear resistant iron-based amorphous high speed arc spray powder core wire of all examples (femncronibnb amorphous coating) are shown in table 1.
Table 1 results of the porosity, hardness and wear rate tests for all examples
| Porosity (%) | Hardness (HV) 0.1 ) | Bond Strength (MPa) | Wear rate (mm) 3 /N·m) | |
| Example 1 | 1.15 | 1444 | 49 | 8.27×10 -6 |
| Comparative example 1 | 1.75 | 1199 | 37 | 9.98×10 -6 |
| Example 2 | 1.21 | 1520 | 47 | 8.52×10 -6 |
| Comparative example 2 | 1.62 | 1239 | 39 | 10.19×10 -6 |
| Example 3 | 1.10 | 1417 | 51 | 9.01×10 -6 |
| Comparative example 3 | 2.01 | 1125 | 43 | 10.22×10 -6 |
Reasonable technological parameters are the basis for ensuring good performance of the coating, wherein the spraying voltage, the spraying current, the spraying distance and the spraying air pressure can influence the temperature, the size distribution and the flying speed of molten particles in the spraying process and the oxidation rate of the molten particles in the flying process, so that the density, the uniformity and the stress distribution of the coating are different, and the performances such as the porosity, the hardness, the bonding strength and the wear resistance of the coating are indirectly influenced. According to the performance test results, the powder core wire manufactured according to the specification is applied to the preparation coating, can form a continuous and compact arc spraying amorphous coating on a 17CrNiMo6 steel substrate, has the advantages of low porosity, high hardness and good wear resistance, and can be applied to the technical fields of surface wear resistance of parts in a large scale.
It will be apparent to those skilled in the art that the present invention has been described in detail by way of illustration only, and it is not intended to be limited by the above-described embodiments, as long as various insubstantial modifications of the method concepts and aspects of the invention are employed or the inventive concepts and aspects of the invention are directly applied to other applications without modification, all within the scope of the invention.
Claims (8)
1. The high wear-resistant iron-based amorphous high-speed electric arc spraying powder core wire is characterized by comprising a coating layer and a powder core, wherein the formula of the powder core wire comprises the following components in percentage by mass: mn: 10-15%; cr: 8-15%; ni:1 to 5 percent; b: 6-10%; nb:1 to 3 percent; the balance being Fe; the high wear-resistant iron-based powder core wire can obtain an amorphous coating with the thickness of 0.2-2 mm of critical amorphous forming size by a high-speed electric arc spraying technology;
the preparation method of the high-wear-resistance iron-based amorphous high-speed electric arc spraying powder core wire comprises the following steps:
s1: weighing Mn powder, cr powder, ni powder, B powder, nb powder and Fe powder according to the proportion for later use;
s2: mixing Mn powder, cr powder, ni powder, B powder, nb powder and Fe powder, and uniformly mixing in a mixer to obtain powder core mixed powder;
s3: sieving the mixed powder of the powder cores to obtain powder core powder;
s4: filling the powder core powder in the step S3 into a coating layer, closing the coating layer to enable the coating layer to coat the powder core powder, then sending the powder core powder into a wire drawing die, and carrying out drawing and reducing in a way by way to obtain a powder core wire;
the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire is applied to preparing a powder core wire amorphous coating, and the preparation method specifically comprises the following steps:
(1) Pretreatment is carried out on the surface of a substrate: removing stains and oil stains on the surface of the matrix by adopting absolute ethyl alcohol or acetone, and then carrying out sand blasting roughening treatment on the surface of the matrix by using iron sand;
(2) Preparing a coating: adopting a high-speed electric arc spraying technology to spray the powder core wire material on the pretreated base material to prepare a coating, wherein the spraying technological parameters are as follows: air pressure: 0.6-0.7 MPa, spraying voltage: 34-38V, spraying current: 190-210A, spraying distance: 180-220 mm; adopting an intermittent spraying method, and repeatedly spraying for 6-8 times to obtain a coating of the high-wear-resistance iron-based amorphous high-speed arc spraying powder core wire; the high wear-resistant iron-based amorphous high-speed arc spraying powder core wire coating is an amorphous coating.
2. The high wear resistant iron-based amorphous high speed arc spraying cored wire of claim 1 wherein the coating layer is 308 stainless steel strip and step S4 is specifically: binding a stainless steel belt into a U shape, and filling the powder core powder obtained in the step S3 into the U shape; and closing the U-shaped stainless steel belt, coating the powder core powder, feeding the powder core powder into a wire drawing die, and drawing and reducing the diameter one by one to obtain the powder core wire.
3. The high wear-resistant iron-based amorphous high-speed arc spraying cored wire of claim 2, wherein in the step S4, a 308 stainless steel band with a width of 12mm and a thickness of 0.3mm is bundled into a U shape, and the obtained cored powder is filled into the U-shaped stainless steel band according to a filling rate of 28% -32%.
4. The high wear resistant iron-based amorphous high speed arc spraying cored wire of claim 3 wherein in step S4, the U-shaped 308 stainless steel band is closed to encase the cored powder, in order to pass through diameters: drawing the powder core wire materials by drawing the powder core wire materials one by a wire drawing die with the diameter of 3.0mm, 2.6mm, 2.4mm, 2.2mm and 2.0 mm.
5. The powder core wire for high-wear-resistant iron-based amorphous high-speed arc spraying according to claim 3, wherein the diameter of the powder core wire obtained in the step S4 is 2mm.
6. The high wear resistant iron-based amorphous high speed arc spraying cored wire of claim 5 wherein the matrix in step (1) is a 17CrNiMo6 steel matrix; the iron sand treated by sand blasting coarsening is 16-18 meshes.
7. The high wear resistant iron-based amorphous high speed arc spraying cored wire of claim 6 wherein the thickness of the coating of the high wear resistant iron-based amorphous high speed arc spraying cored wire obtained in step (2) is 0.4 to 0.7mm.
8. The high wear resistant iron-based amorphous high speed arc spraying cored wire of claim 6 wherein the porosity of the coating of the high wear resistant iron-based amorphous high speed arc spraying cored wire obtained in step (2) is less than or equal to 1.5%, the bonding strength is less than or equal to 45MPa and the vickers hardness is 1400HV 0.1 -1500HV 0.1 。
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