NL2026322A - Wear-resistant material with high strength and toughness, and preparation method and use thereof - Google Patents
Wear-resistant material with high strength and toughness, and preparation method and use thereof Download PDFInfo
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- NL2026322A NL2026322A NL2026322A NL2026322A NL2026322A NL 2026322 A NL2026322 A NL 2026322A NL 2026322 A NL2026322 A NL 2026322A NL 2026322 A NL2026322 A NL 2026322A NL 2026322 A NL2026322 A NL 2026322A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B33/00—Tilling implements with rotary driven tools, e.g. in combination with fertiliser distributors or seeders, with grubbing chains, with sloping axles, with driven discs
- A01B33/08—Tools; Details, e.g. adaptations of transmissions or gearings
- A01B33/10—Structural or functional features of the tools ; Theoretical aspects of the cutting action
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
- B23K35/025—Pastes, creams, slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/228—Selection of materials for cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/302—Cu as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
- B23K35/327—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C comprising refractory compounds, e.g. carbides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/58—Oils
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
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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
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
-
- 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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
- C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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Abstract
The present invention relates to the technical field of ag— ricultural machinery equipment, in particular to a wear— 5 resistant material with high strength and toughness, and a preparation method and a use thereof. The wear—resistant mate— rial with high strength and toughness comprises the following components in parts by weight: 5—25 parts of tungsten carbide, 3—5 parts of vanadium carbide and 70—92 parts of a Cu—Sn—Ti 10 brazing filler metal, and can be used in a cutter, such as a rotary blade. The surface of the cutter is provided with a wear—resistant coating with high strength and toughness; the wear—resistant coating with high strength and toughness is mainly made of the wear—resistant material with high strength 15 and toughness. The method for preparing the cutter comprises steps of coating a pasty wear—resistant material with high strength and toughness onto a surface of a cutter which has subjected to a pretreatment, drying, braze coating, and then performing a vacuum heat treatment. In the present invention, 20 the tungsten carbide and the vanadium carbide are combined in proportion, and the vanadium carbide improves the toughness of a tungsten carbide material; a Cu—Sn—Ti brazing filler metal with a low melting point is used such that the heat loss in the reinforced phase is small, and cracks do not easily occur; 25 as a result, both the high strength and high toughness of a material are improved, and the material can greatly prolong the service life of a rotary blade when used in a cutter such as a rotary blade.
Description
Wear-resistant material with high strength and toughness, and preparation method and use thereof Technical Field The present invention relates to the technical field of ag- ricultural machinery equipment, in particular to a wear- resistant material with high strength and toughness, and a preparation method and a use thereof. Background Agricultural tillage machinery is the machinery used for ploughing, loosening or subsoiling and breaking soil, includ- ing a turnplow, a disc plow, a chisel plow and a rotary cultivator. A rotary blade is the main wear and consumption component of the rotary cultivator, and during the use, the relative movement speed between the rotary blade and soil is extremely high and the rotary blade is in a working environ- ment with high wear and high impact, causing huge losses every year for the wear and replacement of the rotary blade.
With the rapid development of the agricultural machinery industry, the speed of cultivating land of the rotary cultiva- tor is greatly improved, which puts forward stricter requirements on the wear resistance of rotary blade, and thus, there is an urgent need to improve the service life of the ro- tary blade and the preparation process of the coating. In view of the above, the present invention has been pro- posed.
Summary An object of the present invention is to provide a wear-re- sistant material with high strength and toughness to solve the technical problem of a short service life resulting from the fact that the toughness and the wear resistance cannot be bal- anced in the prior art.
A further object of the present invention is to provide a method for preparing the wear-resistant material with high strength and toughness, which is simple to operate, has a low production cost and a high production efficiency.
A still further object of the present invention is to pro- vide a use of the wear-resistant material with high strength and toughness, such as in a rotary blade, wherein said wear- resistant material with high strength and toughness can effec- tively increase the service life of the rotary blade and improve the working efficiency.
In order to achieve the above object of the present inven- tion, the following technical solutions are used: a wear-resistant material with high strength and toughness, comprising the following components in parts by weight: 5-25 parts of tungsten carbide, 3-5 parts of vanadium car- bide and 70-92 parts of a Cu-Sn-Ti brazing filler metal. It is not true that a harder coating material will defi- mnitely bring a better wear resistance. The harder the material, the worse the toughness, and the coating is prone to cracking or even shedding during use, which reduces the ser- vice life of the coating and causes environmental pollution and other disadvantages. According to the wear-resistant mate- rial with high strength and toughness of the present invention, tungsten carbide and vanadium carbide are combined in proportion, such that both high strength and high toughness of the material are improved; and meanwhile, a Cu-Sn-Ti braz- ing filler metal with a low melting point is used such that the heat loss in the reinforced phase of the material is small and cracks does not easily occur, which further improves the strength of the material.
As in different embodiments, the amount of tungsten carbide can be 5 parts, 6 parts, 7 parts, 8 parts, 8 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, etc.
As in different embodiments, the amount of vanadium carbide can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc.
As in different embodiments, the amount of the Cu-Sn-Ti brazing filler metal can be 70 parts, 71 parts, 72 parts, 73 parts, 74 parts, 75 parts, 76 parts, 77 parts, 78 parts, 79 parts, 80 parts, 81 parts, 82 parts, 83 parts, 84 parts, 85 parts, 86 parts, 87 parts, 88 parts, 89 parts, 90 parts, 91 parts, 92 parts, etc. In such a case, Cu-Sn-Ti brazing filler metal powder is prepared by mixing Cu, Sn and Ti metal pow- ders.
In one embodiment of the present invention, the mole per- centages of Cu, Sn, and Ti in the Cu-Sn-Ti brazing filler metal are 754-853, 5%-15%, and 5%-15%, respectively.
In one embodiment of the present invention, the Cu-5n-Ti brazing filler metal is a Cu80Snl0Til0 brazing filler metal. In such a case, the Cu80Snl0Til0 brazing filler metal is ob- tained from Cu, Sn and Ti at a ratio of 80 : 10 : 10 in mole percentage.
The three components in the Cu-Sn-Ti brazing filler metal are within the above range, which can effectively improve the uniformity, and at the same time make the brazing filler metal powder have a suitable melting point. The brazing temperature is below 1000°C, which further reduces the thermal damage of the reinforced phase and reduces cracks. In a preferred embodiment of the present invention, the amount of tungsten carbide in the wear-resistant material with high strength and toughness is 5-15 parts. The tungsten carbide, vanadium carbide and Cu-Sn-Ti brazing filler metal used in the present invention are all in a powder form, and the oxygen element contents of them are all less than 800 ppm, and the impurity contents are all less than 0.6 wt. %. In a preferred embodiment of the present invention, the particle size of the tungsten carbide is 106-150 um. In a preferred embodiment of the present invention, the particle size of the vanadium carbide is 75-106 um. In one embodiment of the present invention, the particle size of the Cu-Sn-Ti brazing filler metal is 48-53 um. Optionally, the wear-resistant material with high strength and toughness further contains a binder.
Optionally, the binder includes one or more of sodium car- boxymethyl cellulose, methyl cellulose, and hydroxypropyl methyl cellulose.
Optionally, the binder is an aqueous solution of one or more of sodium carboxymethyl cellulose, methyl cellulose, and hydroxypropyl methyl cellulose; further, the mass concentra- 5 tion of the aqueous solution is 1% +4 0.5%, preferably 1%.
Optionally, the amount of the binder is 3%-5% of the wear- resistant material with high strength and toughness based on the aqueous solution.
The mixed material is formulated into a paste by using the binder. After being formulated into a paste, the material can be applied onto the surface of the product to be treated and dried to form a coating. In such a case, the product to be treated may be a cutter, etc., such as a rotary blade.
The present invention also provides a method for preparing the above wear-resistant material with high strength and toughness, comprising the following steps: uniformly mixing the raw materials in proportion.
Optionally, mixing can be carried out in a blender mixer, and the mixing time can be 1-3 h, such as 2 h.
Optionally, the mixed material is formulated into a paste by using the binder.
The present invention also provides a use of the above wear-resistant material with high strength and toughness in a cutter, such as in a rotary blade.
The invention also provides a cutter, preferably a rotary blade, the surface of which is provided with a wear-resistant coating with high strength and toughness; The wear-resistant coating with high strength and toughness is mainly made of the wear-resistant material with high strength and toughness.
Optionally, the material of the rotary blade is a 65Mn steel, such as a quenched 65Mn steel.
Preferably, at least one surface at a cutting edge of the rotary blade is provided with the wear-resistant coating with high strength and toughness. For example, the wear-resistant coating with high strength and toughness is provided on the cutting edge, both faces of the cutting edge and the side of the cutting edge.
In a preferred embodiment of the present invention, the thickness of the wear-resistant coating with high strength and toughness is 0.5-1.5 mm.
Preferably, the surface of the rotary blade is provided with a mesh sleeve of metal fiber, and the wear-resistant coating with high strength and toughness is provided at the cutting edge of the rotary blade and fills the gaps of the mesh sleeve of metal fiber.
The mesh sleeve of metal fiber is sleeved on the surface of the rotary blade, and the mesh sleeve of metal fiber is used as a framework material for priming, which has the function of pinning reinforcement, further enhances the toughness and strength of the coating, inhibits the brittle peeling of the coating, and prolongs the service life.
The present invention also provides a method for preparing the cutter, comprising the following steps:
: coating a pasty wear-resistant material with high strength and toughness onto a surface of a cutter which has been sub- jected to a pretreatment, drying, braze coating, and then performing a vacuum heat treatment.
Opticnally, a method of the pretreatment comprises: sleev- ing a mesh sleeve of metal fiber onto a surface-treated cutting edge of the cutter.
In such a case, the mesh sleeve of metal fiber is woven from an appropriate amount of metal fibers, and its shape is similar to the shape of the cutting edge of the rotary blade. The gap size of the mesh sleeve of metal fiber can be selected according to actual needs, preferably 2-8 mm.
Optionally, the metal fiber includes one or more of a stainless steel fiber, a nickel fiber, an iron fiber, and a copper fiber. Optionally, the diameter of the metal fiber is 50-100 Hm.
Optionally, the surface treatment method comprises: shot blasting and sand blasting the surface of a cutter, such as a rotary blade, and then polishing the rotary blade at the cut- ting edge thereof.
Optionally, a method of drying comprises: cooling and air- ing, and then keeping the temperature at 110°C-120°C for 30-60 min, such that the moisture inside the coating can be com- pletely removed by drying.
Braze coating can be carried out in a brazing furnace, such as a continuous mesh belt gas shielded brazing furnace. Op- tionally, the atmosphere of the braze coating is a mixed gas of hydrogen and nitrogen with a volume ratio of (2-4) : 1, such as a mixed gas of hydrogen and nitrogen with a volume ra- tio of 3 : 1. Optionally, the braze coating temperature is 920°C-950°C; and the transmission frequency of the mesh belt is 20-30 Hz.
In the prior art, a mixed gas of hydrogen and nitrogen pro- duced by decomposition of liquid ammonia is used as a protective gas; the storage conditions of liquid ammonia are strict, with potential safety hazard. Moreover, the decomposi- tion of liquid ammonia requires a specific device, which is relatively expensive. In the present invention, it is safe and feasible to directly use a mixture of nitrogen and hydrogen to replace the protective gas produced by ammonia decomposition.
At the same time, the mixing ratio of nitrogen and hydrogen can be adjusted, and properly increasing the proportion of hy- drogen will provide better gas protection and improve the brightness of the coating.
By using the above braze coating method, batch braze coat- ing of a cutter such as a rotary blade can be realized, with a high braze coating efficiency and a good quality stability. At the same time, the protective gas used in the braze coating is a mixed gas of hydrogen and nitrogen with a volume ratio of 3 : 1, which reduces the cost of the braze coating.
Optionally, conditions of the vacuum heat treatment com- prise: quenching at 805°C + 10°C, keeping the temperature for 15-20 min, and oil cooling; tempering at 350°C + 10°C and keeping the temperature for 25-30 min.
After using the above vacuum heat treatment, the hardness of a cutter such as a rotary blade is in the range of 43- 47HRC.
The whole rotary cutter is placed in a tunnel furnace for braze coating. Under the action of thermal cycle, the original heat treatment structure of the steel matrix of the rotary blade is destroyed, and the overall hardness is reduced. Therefore, heat treatment should be carried out again after braze coating to recover the hardness of the steel matrix of the cutter.
In one embodiment of the invention, the method for prepar- ing the rotary blade comprises the following steps: (a) shot blasting and sand blasting a surface of the rotary blade, polishing the rotary blade at a cutting edge thereof, and sleeving a mesh sleeve of metal fiber onto the cutting edge of the rotary blade; (b) coating a pasty wear-resistant material with high strength and toughness onto the cutting edge of the rotary blade with the gaps of the mesh sleeve of metal fiber being filled, followed by drying and braze coating; and (c¢) preforming a vacuum heat treatment to the rotary blade after braze coating.
The invention also provides a rotary cultivator comprising the above cutter. Compared with the prior art, the beneficial effects of the present invention are: (1) in the wear-resistant material with high strength and toughness of the present invention, the tungsten carbide and the vanadium carbide are combined in proportion, wherein the vanadium carbide is used to enhance the toughness of a tung- sten carbide material, and the Cu-Sn-Ti brazing filler metal with a low melting point is used, such that the heat loss in the reinforced phase of the material is small and cracks does not easily occur, which improves the strength of the material; and both the high strength and high toughness of the material are improved; (2) when the wear-resistant material with high strength and toughness of the present invention is used in a cutter such as a rotary blade, the mesh sleeve of metal fiber is used as a framework material for priming, which has the function of pin- ning reinforcement, further enhances the toughness and strength of the coating, inhibits the brittle peeling of the coating, and greatly prolongs the service life of the rotary blade; and (3) the preparation method of the present invention can be carried out in batches and can achieve a high production effi- ciency and a good quality stability of the product thus obtained.
Brief Description of the Drawings In order to illustrate the technical solutions in the par- ticular embodiments of the present invention or in the prior art more clearly, the accompanying drawings to be used in the description of the particular embodiments or the prior art will be briefly introduced below; obviously, the accompanying drawings in the following description show some of the embodi- ments of the present invention, and those of ordinary skill in the art may still derive other drawings from these accompany- ing drawings without creative effort. Fig. 1 is a microstructure graph of the wear-resistant coating with high strength and toughness provided by Embodi- ment 1 of the present invention;
Fig. 2 is a microstructure graph of the conventional coat- ing provided in Comparative Example 1. Detailed description of the preferred embodiment The technical solutions of the present invention will be described clearly and completely below with reference to the drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are a part of the embodiments of the present invention, but not all the embodiments, these embodiments serve only to illustrate the present invention and are not limiting the scope of the present invention.
Based on the embodiments of the present in- vention, all other embodiments obtained by those of ordinary skill in the art without involving any inventive effort fall within the scope of protection of the present invention.
If the specific conditions are not indicated in the embodiments, the conventional conditions or the conditions suggested by the manufacturer shall be followed.
Any reagents or instruments used, unless the manufacture stated, are conventional products that can be obtained through market purchase.
Embodiment 1 The wear-resistant material with high strength and tough- ness of this embodiment comprises the following components in parts by weight: 10 parts of tungsten carbide, 5 parts of vanadium carbide and 85 parts of a CuB803Snl0Til0 brazing filler metal powder.
In such a case, the particle size of tungsten carbide is 106-150 um, the particle size of vanadium carbide is 75-106 um, and the particle size of the Cu80Snl0Til0 brazing filler metal powder is 48-53 um; the oxygen contents are all less than 800 ppm, and the impurity contents are all lower than 0.6 wi. 2.
A method for preparing the wear-resistant material with high strength and toughness, comprising the following steps: weighing and taking each of the above components in propor- tion respectively, charging the above components into a blender mixer and taking out the mixture after mixing for 2 hours to obtain the wear-resistant material with high strength and toughness.
When used, a binder in an amount of 3% can be used to for- mulate the wear-resistant material with high strength and toughness into a paste form, wherein the binder is an aqueous solution of sodium carboxymethyl cellulose with a mass concen- tration of 1%.
Fmbodiment 2 The wear-resistant material with high strength and tough- ness of this embodiment comprises the following components in parts by weight: 15 parts of tungsten carbide, 4 parts of vanadium carbide and 81 parts of a CuB80Snl0Til0 brazing filler metal powder.
In such a case, the particle size of tungsten carbide is 106-150 um, the particle size of vanadium carbide is 75-106 um, and the particle size of the Cu80Snl0Til0 brazing filler metal powder is 48-53 um; the oxygen contents are all less than 800 ppm, and the impurity contents are all lower than 0.6 wt.%.
A method for preparing the wear-resistant material with high strength and toughness, comprising the following steps:
weighing and taking each of the above components in propor- tion, charging the above components into a blender mixer and taking out the mixture after mixing for 2 hours to obtain the wear-resistant material with high strength and toughness.
When used, a binder in an amount of 3% can be used to for- mulate the wear-resistant material with high strength and toughness into a paste form, wherein the binder is an agueous solution of sodium carboxymethyl cellulose with a mass concen- tration of 1%. Fmbodiment 3 The wear-resistant material with high strength and tough- ness of this embodiment comprises the following components in parts by weight: parts of tungsten carbide, 3 parts of vanadium carbide and 77 parts of a Cu80Snl0Til0 brazing filler metal powder. In such a case, the particle size of tungsten carbide is 20 106-150 um, the particle size of vanadium carbide is 75-106 um, and the particle size of the CuB80Snl0Til0 brazing filler metal powder is 48-53 um; the oxygen contents are all less than 800 ppm, and the impurity contents are all lower than 0.6 wWL.&, A method for preparing the wear-resistant material with high strength and toughness, comprising the following steps: weighing and taking each of the above components in propor- tion, charging the above components into a blender mixer and taking out the mixture after mixing for 2 hours to obtain the wear-resistant material with high strength and toughness.
When used, a binder in an amount of 3% can be used to for- mulate the wear-resistant material with high strength and toughness into a paste form, wherein the binder is an aqueous solution of sodium carboxymethyl cellulose with a mass concen- tration of 1%. Embodiment 4 The wear-resistant material with high strength and tough- ness of this embodiment comprises the following components in parts by weight: 22 parts of tungsten carbide, 5 parts of vanadium carbide and 73 parts of a Cu8O0SnlCTil0 brazing filler metal powder. In such a case, the particle size of tungsten carbide is 106-150 um, the particle size of vanadium carbide is 75-106 um, and the particle size of the Cu80Snl0Til0 brazing filler metal powder is 48-53 um; the oxygen contents are all less than 800 ppm, and the impurity contents are all lower than 0.6 wt.%.
A method for preparing the wear-resistant material with high strength and toughness, comprising the following steps: weighing and taking each of the above components in propor- tion, charging the above components into a blender mixer and taking out the mixture after mixing for 2 hours to obtain the wear-resistant material with high strength and toughness. When used, a binder in an amount of 3% can be used to for- mulate the wear-resistant material with high strength and toughness into a paste form, wherein the binder is an aqueous solution of sodium carboxymethyl cellulose with a mass concen- tration of 1%.
Embodiment 5 The wear-resistant material with high strength and tough- ness of this embodiment comprises the following components in parts by weight: 25 parts of tungsten carbide, 4 parts of vanadium carbide and 71 parts of a CuB803Snl0Til0 brazing filler metal powder.
In such a case, the particle size of tungsten carbide is 106-150 um, the particle size of vanadium carbide is 75-106 um, and the particle size of the Cu80Snl0Til0 brazing filler metal powder is 48-53 um; the oxygen contents are all less than 800 ppm, and the impurity contents are all lower than 0.6 wt.#.
A method for preparing the wear-resistant material with high strength and toughness, comprising the following steps: weighing and taking each of the above components in propor- tion, charging the above components into a blender mixer and taking out the mixture after mixing for 2 hours to obtain the wear-resistant material with high strength and toughness.
When used, a binder in an amount of 3% can be used to for- mulate the wear-resistant material with high strength and toughness into a paste form, wherein the binder is an aqueous solution of sodium carboxymethyl cellulose with a mass concen- tration of 1%.
Embodiment 6 For this embodiment, reference is made to the preparation method of Embodiment 1, the difference only lies in that the CuB803nl0Ti10 brazing filler metal is replaced with a CuB85Snl10Ti5 brazing filler metal.
Embodiment 7
For this embodiment, reference is made to the preparation method of Embodiment 1, the difference only lies in that the particle size of tungsten carbide is 1500 um, the particle size of vanadium carbide is 850 um, and the particle size of the Cu80Snl0Til0 brazing filler metal powder is 120 um.
Embodiment 8
This embodiment provides a method for preparing a rotary blade, comprising the following steps:
(a) shot blasting and sand blasting a surface of the rotary blade to remove oil stains and oxide skin therefrom, and then polishing a cutting edge of the rotary blade;
(b) taking an appropriate amount of stainless steel metal fibers and weaving them into a mesh sleeve having a shape sim- ilar to that of the cutting edge of the rotary blade, and sleeving the mesh sleeve onto the cutting edge of the rotary blade treated in step (a);
(¢) uniformly applying the wear-resistant material with high strength and toughness in a paste form prepared in Embod- iment 1 onto both faces and the side of the cutting edge, with the thickness of the coating being controlled to be about 1 mm, and then cooling and airing the coating to obtain a coated rotary blade;
{d) placing the coated rotary blade obtained in step (c) into a drying oven, keeping the temperature at 110°C-120°C for 30-60 min such that the moisture inside the coating can be completely removed by drying, placing the dried rotary blade into a continuous mesh belt gas shielded braze coating furnace and heating the same therein, and then preforming a braze coating to the coating,
wherein the temperature of the braze coating is 920°C- 950°C, the transmission frequency of the mesh belt is 20-30
Hz; the atmosphere of braze coating is a mixed gas of hydrogen and nitrogen with a volume ratio of 3 : 1; and (e) performing a vacuum heat treatment to the rotary blade braze coated in step (d), such that the hardness of the rotary blade after treatment is 43-47 HRC, wherein conditions of the vacuum heat treatment comprise: quenching at 805°C + 10°C, keeping the temperature for 15-20 min, and oil cooling; tempering at 350°C + 10°C and keeping the temperature for 25-30 min.
Embodiment 9 For this embodiment, reference is made to the preparation method of the rotary blade of Embodiment 8, the difference only lies in that: in step (c¢): uniformly applying the wear-resistant material with high strength and toughness in a paste form prepared in Embodiment 2 onto both faces and the side of the cutting edge, with the thickness of the coating being controlled to be about 1 mm, cooling and airing the coating to obtain a coated rotary blade.
Embodiment 10 For this embodiment, reference is made to the preparation method of the rotary blade of Embodiment 8, the difference only lies in that: in step {c): uniformly applying the wear-resistant material with high strength and toughness in a paste form prepared in Embodiment 3 onto both faces and the side of the cutting edge, with the thickness of the coating being controlled to be about 1 mm, cooling and airing the coating to obtain a coated rotary blade.
Embodiment 11
For this embodiment, reference is made to the preparation method of the rotary blade of Embodiment 8, the difference only lies in that: in step (¢): uniformly applying the wear-resistant material with high strength and toughness in a paste form prepared in Embodiment 4 onto both faces and the side of the cutting edge, with the thickness of the coating being controlled to be about 1 mm, cooling and airing the coating to obtain a coated rotary blade.
Embodiment 12 For this embodiment, reference is made to the preparation method of the rotary blade of Embodiment 8, the difference only lies in that: in step (c¢): uniformly applying the wear-resistant material with high strength and toughness in a paste form prepared in Embodiment 5 onto both faces and the side of the cutting edge, with the thickness of the coating being controlled to be about 1 mm, cooling and airing the coating to obtain a coated rotary blade.
Embodiment 13 For this embodiment, reference is made to the preparation method of the rotary blade of Embodiment 8, the difference only lies in that: in step {c): uniformly applying the wear-resistant material with high strength and toughness in a paste form prepared in Embodiment 6 onto both faces and the side of the cutting edge, with the thickness of the coating being controlled to be about 1 mm, cooling and airing the coating to obtain a coated rotary blade.
Embodiment 14
For this embodiment, reference is made to the preparation method of the rotary blade of Embodiment 8, the difference only lies in that: in step (¢): uniformly applying the wear-resistant material with high strength and toughness in a paste form prepared in Embodiment 7 onto both faces and the side of the cutting edge, with the thickness of the coating being controlled to be about 1 mm, cooling and airing the coating to obtain a coated rotary blade.
Embodiment 15 For this embodiment, reference is made to the preparation method of the rotary blade of Embodiment 8, the difference only lies in that: no step (b) is included, and no mesh sleeve of metal fiber is provided. Comparative Example 1 For Comparative Example 1, reference is made to the prepa- ration method of Embodiment 1, the differences lie in that the coating materials used are a BNi2 brazing filler metal and tungsten carbide, a mesh sleeve of metal fiber is contained in the coating material, and the mass percentage of tungsten car- bide is 25%.
Comparative Example 2 For Comparative Example 2, reference is made to the prepa- ration method of Embodiment 1, the differences lie in that no mesh sleeve of metal fiber is included, and the wear-resistant material with high strength and toughness is replaced with a material having the following components: 5 parts of tungsten carbide, 10 parts of vanadium carbide and 85 parts of a Cu-Sn-Ti brazing filler metal.
Comparative Example 3 For Comparative Example 3, reference 1s made to the prepa- ration method of Embodiment 1, the differences lie in that no mesh sleeve of metal fiber is included, and the wear-resistant material with high strength and toughness is replaced with a material having the following components: 5 parts of tungsten carbide, 10 parts of vanadium carbide and 85 parts of a BNi2 brazing filler metal.
Experimental Example 1 In order to compare and explain the performance difference of the coatings obtained by the materials of the embodiments of the present invention and the comparative examples, coat- ings with a thickness of 0.8 mm are respectively prepared from the materials of Embodiments 1-7 and Comparative Examples 1-3 on quenched 65Mn steel with a specification of 25 mm x 5 mm x 100 mm using the same process (refer to the process of Embodi- ment 8), as well as Embodiment 15, a coating wear test is carried out. During the wear test, a house-made test platform is used, and one end of a 25 mm x 5 mm x 100 mm test sample is punched and fixed on a rotatable shaft, which is then placed in a mixed environment of sand and water, rotated for 8 h at 200 r/min, and weighed for obtaining its mass change before and after the test; the test results are shown in Table 1. Table 1: The weight changes of the test sample before and after the wear test
Wear test/1 h
115.280 111.024 4.256 Example 1 mesi |e |e |e
114.230 109.373 4.857 Example 2 mees | ee [een |e
113.660 109.376 4.284 Example 3 Embodiment 1 and Comparative Example 1 are taken as exam- ples, coatings with a thickness of 0.8 mm are prepared on the quenched 65Mn steel using the above process, and the micro- structures of the coatings are shown in Fig. 1 and Fig. 2, respectively, with the same magnification. It can be seen from the figures that the coating obtained by using the wear-resistant material with high strength and toughness of Embodiment 1 has a good toughness and is a dense coating. However, the coating obtained by using the coating material of Comparative Example 1 is brittle and hard, and has many cracks. Experimental Example 2 In order to compare and explain the performance difference of the coatings obtained by the materials of the embodiments of the present invention and the comparative examples, coat- ings with a thickness of 0.8 mm are respectively prepared from the materials of Embodiments 1-7 and Comparative Examples 1-3 on the same rotary blade substrate using the same process (re- fer to the process of Embodiment 8), as well as Embodiment 15, a rotary blade with a coating is obtained, the rotary blade is directly mounted on a rotary cultivator for the tillage opera- tion in the farmland, and the service life of the rotary blade is tested; the actual farming results of the rotary blade in the farmland are shown in Table 2. Table 2: Farming results of rotary blade in farmland It can be seen from the above table that the actual test service life of the rotary blade coated with the wear-re- sistant coating with high strength and toughness of the present invention is at least 1.99 times longer than that of a rotary blade with a traditional coating.
It should be finally noted that, the above embodiments are merely used for illustrating, rather than limiting, the tech- nical solutions of the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of or- dinary skill in the field that: the technical solutions specified in the foregoing embodiments could still be modi- fied, or some or all of the technical features thereof may be equivalently replaced; and the modifications or replacements do not make the essence of corresponding technical solutions depart from the scope of the technical solution of the embodi- ments of the present invention.
Claims (10)
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| CN113319404B (en) * | 2021-06-18 | 2022-09-30 | 哈尔滨焊接研究院有限公司 | Hollow tungsten argon arc welding method for nickel-saving austenitic stainless steel |
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| US20100196734A1 (en) * | 2008-10-09 | 2010-08-05 | H.C. Starck Ceramics Gmbh & Co. Kg | Wear protection sheets, processes for producing the same, and uses thereof |
| CN109487266A (en) * | 2018-12-13 | 2019-03-19 | 郑州机械研究所有限公司 | A kind of rotary tillage cutter high-bearing capacity wear-resistant coating |
| CN109663922A (en) * | 2018-12-13 | 2019-04-23 | 郑州机械研究所有限公司 | A kind of rotary tillage cutter wear-resistant coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100196734A1 (en) * | 2008-10-09 | 2010-08-05 | H.C. Starck Ceramics Gmbh & Co. Kg | Wear protection sheets, processes for producing the same, and uses thereof |
| CN109487266A (en) * | 2018-12-13 | 2019-03-19 | 郑州机械研究所有限公司 | A kind of rotary tillage cutter high-bearing capacity wear-resistant coating |
| CN109663922A (en) * | 2018-12-13 | 2019-04-23 | 郑州机械研究所有限公司 | A kind of rotary tillage cutter wear-resistant coating |
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