CN106041031B - A kind of preparation method of cast(ing) surface high entropy alloy coating - Google Patents

A kind of preparation method of cast(ing) surface high entropy alloy coating Download PDF

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Publication number
CN106041031B
CN106041031B CN201610613482.7A CN201610613482A CN106041031B CN 106041031 B CN106041031 B CN 106041031B CN 201610613482 A CN201610613482 A CN 201610613482A CN 106041031 B CN106041031 B CN 106041031B
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entropy alloy
alloy coating
high entropy
precast body
cast
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CN106041031A (en
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纪秀林
鲍亚运
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Changzhou Campus of Hohai University
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Changzhou Campus of Hohai University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B22D23/04Casting by dipping
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C30/00Alloys containing less than 50% by weight of each constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C30/00Alloys containing less than 50% by weight of each constituent
    • C22C30/02Alloys containing less than 50% by weight of each constituent containing copper

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

The present invention discloses a kind of preparation method of cast(ing) surface high entropy alloy coating, include the following steps: the preparation of S1, precast body: bonding agent is added in high entropy alloy coating raw material powder, it is mixed to form paste, is then pressed into cylindric precast body, then precast body is dried;S2, moulding: making sand mold type chamber using sand, after sand solidified, digs groove in cavity wall part privileged site, the precast body in S1 is placed in a groove;The molten metal of molten state: being poured into that type is intracavitary by S3, casting at normal temperatures and pressures, and under the heat effect of molten metal dissolution diffusion occurs for precast body, forms high entropy alloy coating in cast(ing) surface after solidification.After step s 3, subsequent heat treatment is carried out again to high entropy alloy coating.The high entropy alloy coating consistency that the present invention prepares is good and the metallurgical junction of matrix is right preferably, and required equipment is simple and convenient to operate, production cost is low.

Description

A kind of preparation method of cast(ing) surface high entropy alloy coating
Technical field
The invention belongs to environmental protection technical fields, and in particular to a kind of preparation side of cast(ing) surface high entropy alloy coating Method.
Background technique
Abrasion is that the service life and reliability one of the main reason for causing machine components to fail, to machine components generate Extreme influence will cause a large amount of economic loss while also counteract industrial expansion.With rapid development of economy, its people's warp The continuous improvement that Ji each department requires capability of engineering equipment, develops the better wear-resistant material of performance and reduces production cost, Simplifying process is still material supplier authors major issue to be solved.
High-entropy alloy is made of 5 to 13 kinds of alloying elements and the atomic percent of every kind of constituent content is 5%~35%.It is more The presence of kind element makes its atomic arrangement tend to confusion, by its distinctive high entropy effect, slow diffusion effect etc., can make height Entropy alloy forms simple institutional framework and obtains the comprehensive performances such as high rigidity, high intensity, corrosion-resistant, high temperature oxidation resisting.Due to High-entropy alloy contains more precious metal, higher cost, therefore by high-entropy alloy and material with higher hardness and wearability Material process for modifying surface combines, and cost can be effectively reduced and expand the application of high-entropy alloy.
Currently, the preparation method of high entropy alloy coating mainly has laser melting coating, magnetron sputtering, plasma cladding etc..Laser High-entropy alloy powder is laid in substrate surface by melting and coating technique, is melted using the high temperature of laser, after being quickly cooled down, i.e., One layer of high entropy alloy coating can be formed.The patent application of Chinese patent literature CN201310300255.5, which discloses, to be used to prepare Alloy powder of high entropy alloy coating and its preparation method and application, but it is not noticed in laser cladding process and may produce The case where bioelement is burnt, the high entropy alloy coating and laser melting coating being finally hardly formed truly need large laser Device, this just increases production cost.Although magnetron sputtering technique can preferably control alloy coat ingredient, to matrix with Target it is more demanding, it is difficult to accomplish scale production.High-entropy alloy powder is equally coated in substrate surface by plasma cladding, Make its thawing using plasma beam, obtains high entropy alloy coating by rapid cooling, but the technical process is more complicated, and can Can be excessive due to input heat, the high entropy alloy coating caused is easy to produce that crackle, hardness are lower and Tissue distribution is uneven The defects of even, while plasma apparatus is expensive, considerably increases production cost.
Summary of the invention
In view of the deficiency of the prior art, the present invention provides a kind of required equipment to be simple and convenient to operate, is produced into The method in cast(ing) surface preparation high entropy alloy coating that this low, coating and substrate are firmly combined.
To achieve the above object, the invention adopts the following technical scheme:
A kind of preparation method of cast(ing) surface high entropy alloy coating, includes the following steps:
The preparation of S1, precast body: bonding agent is added in high entropy alloy coating raw material powder, is mixed to form paste, then It is pressed into cylindric precast body, then precast body is dried;
S2, moulding: production sand mold type chamber digs groove in cavity wall part privileged site, in S1 after sand solidified Precast body place in a groove;
The molten metal of molten state: being poured into that type is intracavitary by S3, casting at normal temperatures and pressures, heat of the precast body in molten metal Effect is lower to occur dissolution diffusion, forms high entropy alloy coating in cast(ing) surface after solidification.
Preferably, bonding agent selects polyvinyl alcohol water solution or alcohol in step S1.
Further, when bonding agent selects polyvinyl alcohol water solution in step S1, solutes content is 4~8wt%.
Further, in step S1, the partial size of high entropy alloy coating raw material powder is 50~200 mesh;Using hydraulic type pressure Paste is pressed into 3~5mm of thickness, diameter under 20~40MPa pressure as the cylindric precast body of 10~30 mm by piece machine, and It is that 60~120 DEG C of vacuum ovens dry 1~4 h that the cylindric precast body being pressed into, which is placed on temperature,.
Further, in step S2, T-shape sand mold is made after furan resin-sand, resinon and curing agent are successively mixed Type chamber;Wherein, resinon accounts for the 2% of sand weight, curing agent and accounts for the 1% of sand weight.
Further, it is symmetrical multiple that the groove is opened in the two sides of T-shape sand mold type chamber;The groove is set as or justifies Cylinder, correspondingly, the width of groove or diameter are suitable with the diameter of precast body, thickness is greater than the thickness of precast body.
Further, it is symmetrical 2 that the groove is opened in the two sides of T-shape sand mold type chamber, the groove with a thickness of 6 ~8 mm.
Preferably, after step s 3, the high entropy alloy coating that cast(ing) surface is formed carries out subsequent heat treatment again: S3 is obtained High entropy alloy coating first in 650 DEG C of preheating 2h, then heat to 1000 DEG C of heat preservation 2h, be air-cooled to 260 DEG C of tempering after room temperature Keep the temperature 2h.
The present invention also provides a kind of high-entropy alloy powder in above-mentioned cast(ing) surface high entropy alloy coating preparation method End, by atomic percentage, including Al, Cr, Fe, Co, Ni, Ti, any a variety of combination in Cu Mn element, And each atom percentage content is 5~25%;The purity of each component is 99% or more.
Above-mentioned high-entropy alloy powder the preparation method comprises the following steps: the high-entropy alloy powder raw material passes through 6~48h of ball milling mixing Afterwards, be then placed in again in 60~120 DEG C of drying box dry 2~6h to get.
The beneficial effects of the present invention are:
1), the high entropy alloy coating consistency prepared of the present invention is good and the metallurgical junction of matrix is right preferably, without examining Consider the limitation requirement of substrate and target;And the high entropy alloy coating even tissue prepared, avoids the appearance of crackle, overcomes The problem of being easy to produce defect using plasma cladding and magnetron sputtering preparation method, it is the high rigidity with high-entropy alloy, resistance to Mill performance, which accesses, to be fully played.
2), pouring metal melt temperature of the present invention is relatively easily controllable, avoids in laser cladding process due to moment temperature Spending height causes certain melting loss of elements in high-entropy alloy to further ensure the present invention to cause large effect to comprehensive performance The reliability of preparation method.
3), in preparation method of the present invention needed for the production equipment used it is simple, operation controllability is strong, low in cost, can be into Row rapid, high volume industrialized production has biggish industrial applications prospect.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention.
Fig. 2 is the micro-organization chart of rich chromium cast iron of the present invention and high-entropy alloy composite alloy layer.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, is clearly and completely retouched to the technical solution in the present invention It states.The following examples are only intended to illustrate the technical solution of the present invention more clearly, and cannot be used as a limitation and limit guarantor of the invention Protect range.
Embodiment
The preparation of S1, precast body: it is 50 that partial size, which is added, as bonding agent in the polyvinyl alcohol water solution for being 4~8wt% using concentration ~200 mesh mix the high entropy alloy coating powder raw material A lCrFeCoNiTi0.5(molecular formula meaning by ball mill are as follows: 0.5 Represent the atom relative scale of Ti in component, the atom relative scale of Al, Cr, Fe, Co, Ni be 1 namely Al, Cr, Fe, Co, The atomic percent of Ni is that the atomic percent of 18.18%, Ti is 9%) to be mixed to form paste, then uses hydraulic type tablet press machine It is compressed into 4~5mm thickness, the cylindric precast body of diameter 20mm under 20~40MPa pressure, then precast body is placed on temperature Degree is dry 1~3 h of 60~120 DEG C of vacuum ovens;
S2, moulding: making T-shape sand mold type chamber after mixing using commercially available furan resin-sand and resinon, curing agent, In, resinon accounts for the 2% of sand weight, and curing agent accounts for the 1% of sand weight, and the two not directly mixes;After sand solidified, in T-shape type 2 grooves are symmetrically dug in cavity wall two sides, and the precast body in 2 S1 is individually positioned in groove;
The rich chromium cast iron molten metal of 1650 DEG C of molten state: being poured into casting mold by S3, casting at normal temperatures and pressures, prefabricated Under the heat effect of molten metal dissolution diffusion occurs for body, forms high entropy alloy coating on high-chromium casting surface after solidification;That is, Surface covering is that casting is formed in after liquid metal is poured and is solidified by preset high-entropy alloy powder precast body in the step The surface of privileged site, specific flow chart are as shown in Figure 1.
In addition, the rich chromium cast iron for having generated alloy-layer to surface can carry out subsequent heat treatment: 650 DEG C first preheating 2h prevent Only casting cracks during heating and reduces retained austenite, then heats to 1000 DEG C of heat preservation 2h, is air-cooled to 260 after room temperature DEG C tempering heat preservation 2h.
Wherein, high entropy alloy coating powder raw material is not limited to above-mentioned one kind, by atomic percentage, including Al, Cr, Any a variety of combination in Fe, Co, Ni, Ti, Cu or Mn element, and guarantee each atom percentage content 5~ 25%;Wherein the purity of each component is technical pure or 99% or more.Above-mentioned raw materials are passed through into 6~48h of ball milling mixing Afterwards, dry 2~6h is placed in 60~120 DEG C of drying box again then to get high-entropy alloy powder.
Characterization test is carried out to above-described embodiment
After Overheating Treatment, micro-hardness testing is carried out to final high entropy alloy coating obtained and metallographic structure is observed.
The hardness of micro-hardness testing matrix as the result is shown is 691HV, and the hardness of high entropy alloy coating is 882HV.Metallographic Structure observation is as shown in Fig. 2, display high entropy alloy coating compactness is good, and coating and matrix metallurgical bonding are good, even tissue, The hardness of the generation of flawless, coating is higher than matrix.It overcomes and is easy to produce using plasma cladding and magnetron sputtering preparation method The problem of raw defect, the high rigidity with high-entropy alloy, wear-resisting property are accessed and are fully played.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations Also it should be regarded as protection scope of the present invention.

Claims (7)

1. a kind of preparation method of cast(ing) surface high entropy alloy coating, it is characterised in that include the following steps:
The preparation of S1, precast body: bonding agent is added in high-entropy alloy powder, paste is mixed to form, is then pressed into cylindric Precast body, then precast body is dried;The high entropy alloy coating raw material presses atomic percentage, including Al, Cr, Fe, Co, Any a variety of combination in Ni, Ti, Cu or Mn element, and each atom percentage content is 5~25%;Each component it is pure Degree is 99% or more;Raw material after 6~48h of ball milling mixing, be then placed in 60~120 DEG C of drying box dry 2 again~ 6h to get arrive high-entropy alloy powder;
S2, moulding: production sand mold type chamber digs groove in cavity bottom, the precast body in S1 is placed on after sand solidified In groove;
The molten metal of molten state: being poured into that type is intracavitary by S3, casting at normal temperatures and pressures, and precast body is acted in the heat of molten metal Lower generation dissolution diffusion, forms high entropy alloy coating in cast(ing) surface after solidification;
After step s 3, the high entropy alloy coating that cast(ing) surface is formed carries out subsequent heat treatment again: the high entropy that S3 is obtained closes Gold plating in 650 DEG C of preheating 2h, then heats to 1000 DEG C of heat preservation 2h first, is air-cooled to 260 DEG C of tempering heat preservation 2h after room temperature.
2. a kind of preparation method of cast(ing) surface high entropy alloy coating according to claim 1, it is characterised in that: step S1 Middle bonding agent selects polyvinyl alcohol water solution or alcohol.
3. a kind of preparation method of cast(ing) surface high entropy alloy coating according to claim 2, it is characterised in that: step S1 When middle bonding agent selects polyvinyl alcohol water solution, solutes content is 4~8wt%.
4. a kind of preparation method of cast(ing) surface high entropy alloy coating according to claim 3, it is characterised in that: step S1 In, the partial size of high entropy alloy coating raw material powder is 50~200 mesh;It will under 20~40MPa pressure using hydraulic type tablet press machine The cylindric precast body that paste is pressed into 3~5mm of thickness, diameter is the cylindric precast body of 10~30mm, and is pressed into is placed It is that 60~120 DEG C of vacuum ovens dry 1~4h in temperature.
5. a kind of preparation method of cast(ing) surface high entropy alloy coating according to claim 4, it is characterised in that: step S2 In, T-shape sand mold type chamber is made after furan resin-sand, resinon and curing agent are successively mixed;Wherein, resinon accounts for sand weight 2%, curing agent accounts for the 1% of sand weight.
6. a kind of preparation method of cast(ing) surface high entropy alloy coating according to claim 5, it is characterised in that: described recessed It is symmetrical multiple that slot is opened in the two sides of T-shape sand mold cavity bottom;The groove is set as cylindrical body, correspondingly, groove is straight Diameter size is suitable with the diameter of precast body, and thickness is greater than the thickness of precast body.
7. a kind of preparation method of cast(ing) surface high entropy alloy coating according to claim 6, it is characterised in that: described recessed It is symmetrical 2 that slot is opened in the two sides of T-shape sand mold cavity bottom, i.e. a groove is opened in side, the groove with a thickness of 6~ 8mm。
CN201610613482.7A 2016-07-29 2016-07-29 A kind of preparation method of cast(ing) surface high entropy alloy coating Expired - Fee Related CN106041031B (en)

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