CN108637166B - Preparation method of slurry pump impeller - Google Patents
Preparation method of slurry pump impeller Download PDFInfo
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- CN108637166B CN108637166B CN201810468202.7A CN201810468202A CN108637166B CN 108637166 B CN108637166 B CN 108637166B CN 201810468202 A CN201810468202 A CN 201810468202A CN 108637166 B CN108637166 B CN 108637166B
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- impeller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/18—Measures for using chemical processes for influencing the surface composition of castings, e.g. for increasing resistance to acid attack
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
- C21B11/10—Making pig-iron other than in blast furnaces in electric furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2294—Rotors specially for centrifugal pumps with special measures for protection, e.g. against abrasion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to the technical field of slurry pumps, and particularly relates to a preparation method of a slurry pump impeller, which comprises the following steps: (1) burdening and smelting; (2) resin sand making; (3) pouring; (4) adopting a quenching and tempering treatment process; (5) after the impeller is molded, brushing slurry for forming a corrosion-resistant layer on the surface of the impeller, and drying; (6) firing the surface of the impeller by using a mixed gas of hydrogen and methane, wherein the firing time is 10-15 s, so as to obtain the slurry pump impeller; the invention adopts a mode of compounding micron-grade alumina and nanometer-grade alumina to brush the mixture on the surface of the impeller of the slurry pump, and the alumina with large and small particle size grades ensures the compactness of particle filling in the corrosion-resistant layer; through the high-temperature firing of the mixed gas of the hydrogen and the methane, the combination state of the filling particle interface on the surface of the corrosion-resistant layer is improved, the corrosion resistance and the impact strength of the slurry pump impeller are ensured, and the service life of the slurry pump impeller is prolonged.
Description
Technical Field
The invention belongs to the technical field of slurry pumps, and particularly relates to a preparation method of a slurry pump impeller.
Background
The slurry pump is a machine which increases the energy of a solid-liquid mixed medium by the rotation of an impeller of the pump, and is mainly used in the fields of mines, power plants, dredging, metallurgy, chemical industry, building materials, petroleum and the like. The operation principle of the slurry pump is that under the action of centrifugal force, liquid is thrown from the center of an impeller to the outer edge and obtains energy, and the liquid leaves the edge of the impeller at high speed and enters a volute pump shell. In the volute pump casing, the liquid is decelerated due to the gradual expansion of the flow passage, part of kinetic energy is converted into static pressure energy, and finally the static pressure energy flows into a discharge pipeline at higher pressure and is sent to a required place. When the liquid flows from the center of the impeller to the outer edge, a certain vacuum is formed in the center of the impeller, and the liquid is continuously pressed into the impeller because the pressure above the liquid level of the storage tank is higher than the pressure at the inlet of the pump.
In the running process of an impeller of the slurry pump, due to the fact that the impeller is washed by the high-speed high-temperature pulp slurry carrying hard particles, the abrasion of materials on the surface of the impeller is serious, the service life of the impeller is very short under the harsh working condition, the impeller needs to be frequently replaced to ensure the reliable and stable running of the slurry pump, the frequent replacement of the impeller can inevitably cause the interruption of production, and the production efficiency is greatly reduced. Therefore, research and development of wear-resistant materials for reducing wear of the impeller in the using process and prolonging the service life of the impeller of the slurry pump are very important subjects and are also important contents of research of technicians at home and abroad at present.
In the prior art, wear-resistant materials such as common white cast iron, nickel hard cast iron, high-chromium cast iron Cr15Mo3 and the like are adopted in sequence, and novel materials such as ceramic materials, austempered cast iron ADI, high polymer materials, high-chromium cast iron containing more than 20% of Cr and the like are also used locally. However, the hard nickel, high chromium, manganese copper and other alloy cast irons which have been developed have different defects as follows: (1) the low-alloy white cast iron has low cost and relatively short service life; (2) the nickel hard cast iron has long service life, less nickel resource, high price and can not be used in large quantity; (3) the wear resistance of the high-chromium cast iron is higher than that of alloy white cast iron, and the chromium resource is rich, the price is moderate and the application is wide; (4) the austempered ductile iron ADI has excellent comprehensive performance, the hardness of the austempered ductile iron ADI is lower than that of high-chromium cast iron, the austempered ductile iron ADI has excellent casting performance, the heat treatment process is simple, the weight is light, and the austempered ductile iron ADI is only used for a small slurry pump; (5) the composite material has the characteristics of excellent wear resistance, corrosion resistance and impact resistance, and low manufacturing cost, but the production process is relatively complex; (6) the polymer material has the advantages of simple and convenient preparation process, energy conservation, excellent performance, high price and greatly improved production cost.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a preparation method of a slurry pump impeller, which overcomes the defects of insufficient strength and easy corrosion of the existing slurry pump impeller, prolongs the service life of the slurry pump impeller, and improves the replacement period of the slurry pump impeller.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a slurry pump impeller comprises the following steps:
(1) the ingredients are prepared according to the following formula: 25% of returned materials, 15% of high-carbon ferrochrome, 15% of low-carbon ferrochrome, 40% of scrap steel and 5% of pig iron;
adding the raw materials into an induction furnace for smelting, sampling and testing after furnace burden is melted down, adjusting molten iron to required components according to the test result, heating the molten iron to 1480-1500 ℃, then adding ferromanganese and ferrosilicon for deoxidation, slagging off, finally adding ferrotitanium, ferrovanadium and rare earth for modification, and finally deoxidizing with aluminum;
(2) adopting resin to make sand mould, placing chilling block at the position of the isolating tongue of the sheath wood mould, and filling sand for moulding; after the mold is manufactured, coating zircon powder alcohol paint on the casting mold, and then core setting and mold assembling;
(3) controlling the temperature of the molten iron in the step (1) to be 1380-1410 ℃ for pouring;
(4) a quenching and tempering treatment process is adopted, the temperature rise speed is controlled to be 32-35 ℃/h, the temperature is kept for 1-2 hours in a step mode within the temperature range of 200-700 ℃, the quenching temperature is 1000-1020 ℃, and the temperature keeping time is 1-3 hours; tempering temperature is 250 ℃, and heat preservation time is 3-5 hours;
(5) after the impeller is formed, brushing slurry for forming a corrosion-resistant layer on the surface of the impeller, then placing the impeller in a room temperature of 20-30 ℃ for airing for 1-2 hours, and then placing the impeller in a vacuum drying oven with the vacuum degree of 0.05-0.30 Mpa and the temperature of 60-70 ℃ for baking for 1-3 hours;
(6) and (3) burning the surface of the impeller in the step (5) by adopting a mixed gas of hydrogen and methane, wherein the burning time is 10-15 s, and thus obtaining the slurry pump impeller.
Preferably, the slurry for forming the corrosion-resistant layer comprises the following raw materials in parts by weight: 20-35 parts of polyvinylpyrrolidone, 12-18 parts of micron-grade alumina, 36-90 parts of nano-grade alumina, 3-8 parts of surfactant, 0.5-2 parts of dispersant and 0.05-0.1 part of nickel powder.
Preferably, the particle size of the micron-grade alumina is 0.2-10 μm;
the grain size of the nano-alumina is 5-50 nm;
the mass ratio of the micron-grade alumina to the nanometer-grade alumina is 1: (3-5).
Preferably, the surfactant is one or a mixture of more than one of fatty alcohol polyoxyethylene-3 ether, lauric acid polyoxyethylene-9 ester, potassium monododecyl phosphate, lecithin, amino acid type and betaine type according to any proportion.
Preferably, the dispersant is one or a mixture of more than one of calcium lignosulphonate, sodium tripolyphosphate, sodium hexametaphosphate, polysulfonate and polycarboxylate.
Preferably, the particle size of the nickel powder is 0.1-5 μm.
Compared with the prior art, the invention has the following technical effects:
according to the invention, micron-grade alumina and nanometer-grade alumina are adopted to be coated on the surface of the slurry pump impeller in a composite manner, and the alumina with large and small particle size grades not only ensures the compactness of particle filling in the corrosion-resistant layer, but also improves the bonding state of the filling particle interface on the surface of the corrosion-resistant layer through high-temperature firing of the mixed gas of hydrogen and methane, improves the bonding rate of particles, and optimizes the stress state of the interface, so that the strength and toughness of the corrosion-resistant layer are effectively improved, the corrosion resistance and impact resistance of the slurry pump impeller are ensured, and the service life of the slurry pump impeller is prolonged.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified with the specific embodiments.
The invention provides a preparation method of a slurry pump impeller, which comprises the following steps:
(1) the ingredients are prepared according to the following formula: 25% of returned materials, 15% of high-carbon ferrochrome, 15% of low-carbon ferrochrome, 40% of scrap steel and 5% of pig iron;
adding the raw materials into an induction furnace for smelting, sampling and testing after furnace burden is melted down, adjusting molten iron to required components according to the test result, heating the molten iron to 1480-1500 ℃, then adding ferromanganese and ferrosilicon for deoxidation, slagging off, finally adding ferrotitanium, ferrovanadium and rare earth for modification, and finally deoxidizing with aluminum;
(2) adopting resin to make sand mould, placing chilling block at the position of the isolating tongue of the sheath wood mould, and filling sand for moulding; after the mold is manufactured, coating zircon powder alcohol paint on the casting mold, and then core setting and mold assembling;
(3) controlling the temperature of the molten iron in the step (1) to be 1380-1410 ℃ for pouring;
(4) a quenching and tempering treatment process is adopted, the temperature rise speed is controlled to be 32-35 ℃/h, the temperature is kept for 1-2 hours in a step mode within the temperature range of 200-700 ℃, the quenching temperature is 1000-1020 ℃, and the temperature keeping time is 1-3 hours; tempering temperature is 250 ℃, and heat preservation time is 3-5 hours;
(5) after the impeller is formed, brushing slurry for forming a corrosion-resistant layer on the surface of the impeller, then placing the impeller in a room temperature of 20-30 ℃ for airing for 1-2 hours, and then placing the impeller in a vacuum drying oven with the vacuum degree of 0.05-0.30 Mpa and the temperature of 60-70 ℃ for baking for 1-3 hours;
(6) and (3) burning the surface of the impeller in the step (5) by adopting a mixed gas of hydrogen and methane, wherein the burning time is 10-15 s, and thus obtaining the slurry pump impeller.
In the invention, the formula content of the corrosion-resistant layer can be selected in a wide range, and in order to ensure that the corrosion-resistant layer has excellent corrosion resistance and impact strength, the corrosion-resistant layer comprises the following raw materials in parts by weight: 20-35 parts of polyvinylpyrrolidone, 12-18 parts of micron-grade alumina, 36-90 parts of nano-grade alumina, 3-8 parts of surfactant, 0.5-2 parts of dispersant and 0.05-0.1 part of nickel powder.
In the present invention, the method for preparing the slurry for forming the corrosion-resistant layer includes the steps of:
(1) weighing micron-grade aluminum oxide, nanometer-grade aluminum oxide and nickel powder according to the formula ratio, uniformly mixing in a high-speed mixer, then blanking into a mixing barrel, adding a solvent, a surfactant and a dispersant, and performing ultrasonic dispersion for 20-30 min to obtain a mixed solution A;
(2) and adding polyvinylpyrrolidone in a stirring state, and continuing stirring for 10-20 min after the addition is finished to obtain the slurry for forming the corrosion-resistant layer.
The solvent is used as a carrier for mixing materials, and the solvent has no special requirements on the solvent, and can be selected from one of ethanol, methanol and acetone.
The preparation process of the slurry for forming the corrosion-resistant layer, provided by the invention, is only a process of mixing and stirring materials, and is simple and convenient and easy to operate.
In the invention, the polyvinylpyrrolidone is used as a binder and is used for primary binding of micron-scale alumina and nanometer-scale alumina, and the polyvinylpyrrolidone is a non-ionic high molecular compound, can be dissolved in water and most of organic solvents, and has low toxicity. Specific examples of the polyvinylpyrrolidone include BASFK85 and K90 in germany.
In the invention, the particle size of the micron-grade alumina is 0.2-10 μm;
the grain size of the nano-alumina is 5-50 nm;
the mass ratio of the micron-grade alumina to the nanometer-grade alumina is 1: (3-5).
In the present invention, the surfactant functions to lower the surface free energy of the alumina powder and to improve the dispersibility of the alumina; in addition, the surfactant can enter surface pores of the alumina particles, so that stress concentration of pores generated during firing is reduced, and the phenomena of peeling and cracking are avoided. Preferably, the surfactant provided by the invention is one or a mixture of more than one of fatty alcohol polyoxyethylene-3 ether, lauric acid polyoxyethylene-9 ester, potassium monododecyl phosphate, lecithin, amino acid type and betaine type according to any proportion.
In the invention, in order to further improve the dispersing ability of the alumina, the slurry for forming the corrosion-resistant layer also contains a dispersing agent, wherein the dispersing agent is one or a mixture of more than one of calcium lignosulphonate, sodium tripolyphosphate, sodium hexametaphosphate, polysulfonate and polycarboxylate.
In the invention, the nickel powder is used as a catalyst for cracking methane, and based on the existence of the nickel powder, a carbon nano tube is generated on the surface of a corrosion-resistant layer in the burning process of hydrogen and methane mixed gas, the nano tube has higher strength, and the shielding effect on a conveying medium is further improved in the using process of a slurry pump impeller.
In the invention, the slurry pump impeller taking high-chromium cast iron as a body comprises the following components in percentage: 2.5 to 3.6% of C, 25 to 30% of Cr, 0.3 to 0.5% of Si, 0.02 to 0.04% of Re, 0.6 to 1.0% of Mo, 0.6 to 0.8% of Cu, 0.4 to 0.7% of Mn, 0.6 to 0.8% of Ni, 1.2 to 1.8% of W, 0.03 to 0.05% of B, 0.05 to 0.15% of Ti, 0.05 to 0.15% of V, and the balance of Fe.
The advantages of the slurry pump impeller provided by the present invention are further illustrated by the following specific examples.
Example 1
The preparation method of the slurry pump impeller comprises the following steps:
(1) the ingredients are prepared according to the following formula: 25% of returned materials, 15% of high-carbon ferrochrome, 15% of low-carbon ferrochrome, 40% of scrap steel and 5% of pig iron;
adding the raw materials into an induction furnace for smelting, sampling and testing after furnace burden is melted down, adjusting molten iron to required components according to the test result, heating the molten iron to 1480 ℃, then adding ferromanganese and ferrosilicon for deoxidation, slagging off, finally adding ferrotitanium, ferrovanadium and rare earth for modification treatment, and finally deoxidizing with aluminum;
(2) adopting resin to make sand mould, placing chilling block at the position of the isolating tongue of the sheath wood mould, and filling sand for moulding; after the mold is manufactured, coating zircon powder alcohol paint on the casting mold, and then core setting and mold assembling;
(3) controlling the molten iron in the step (1) to be poured at the temperature of 1400 ℃;
(4) adopting a quenching and tempering treatment process, controlling the temperature rise speed at 32 ℃/h, carrying out step heat preservation for 2 hours in a temperature range of 200 ℃, carrying out quenching temperature at 1000 ℃, and carrying out heat preservation for 2 hours; tempering temperature is 250 ℃, and the heat preservation time is 4 hours;
(5) after the impeller is formed, coating slurry for forming a corrosion-resistant layer on the surface of the impeller, wherein the coating thickness is 0.3mm, then placing the impeller in a room temperature of 25 ℃ for airing for 2 hours, and then placing the impeller in a vacuum drying oven with the vacuum degree of 0.20Mpa and the temperature of 65 ℃ for baking for 2 hours;
(6) and (3) burning the surface of the impeller in the step (5) by adopting a mixed gas of hydrogen and methane, wherein the burning time is 10s, and thus the slurry pump impeller is obtained.
The slurry pump impeller taking the high-chromium cast iron as the body comprises the following components in percentage: c3%, Cr 28%, Si 0.4%, Re 0.03%, Mo 0.8%, Cu 0.7%, Mn 0.5%, Ni 0.7%, W1.5%, B0.04%, Ti 0.1%, V0.1%, and the balance of iron;
the slurry for forming a corrosion-resistant layer includes:
28kg of polyvinylpyrrolidone (BASF K85, Germany) and micron-sized alumina (available from KR-Al, Inc., nano technology, Inc., Run, Ki, of Anhui Ke
2O
3-3)15kg of nano-alumina (available from KR-Al, Inc., of nano-technology, Inc., Runzi, Ohio, Kagaku, Ltd.)
2O
3-1)45kg, 5kg of surfactant lauric acid polyoxyethylene-9 fat, 1.2kg of dispersant calcium lignosulfonate, and 0.08kg of nickel powder (available from Changshajuyu metal materials Co., Ltd., trade name LNC-I (particle size of 0.4 μm)).
The preparation method of the slurry for forming the corrosion-resistant layer comprises the following steps:
s1: weighing micrometer aluminum oxide (KR-Al from Anhui Kerun nanometer technology Co., Ltd.)
2O
3-3), nano-alumina (available from KR-Al, a science and technology ltd, lub, Anhui, Inc
2O
3-1) and nickel powder (purchased from Changsha Liyou metal materials Co., Ltd., under the brand name LNC-I (particle size of 0.4 μm)), uniformly mixing in a high-speed mixer, then blanking into a mixing barrel, adding ethanol, surfactant lauric acid polyoxyethylene-9 ester and dispersant calcium lignosulfonate, and performing ultrasonic dispersion for 20min to obtain a mixed solution A;
s2: polyvinylpyrrolidone (BASF K85, germany) was added with stirring, and after the addition, stirring was continued for 15min to obtain a slurry for forming a corrosion-resistant layer.
Example 2
The preparation method of the slurry pump impeller comprises the following steps:
(1) the ingredients are prepared according to the following formula: 25% of returned materials, 15% of high-carbon ferrochrome, 15% of low-carbon ferrochrome, 40% of scrap steel and 5% of pig iron;
adding the raw materials into an induction furnace for smelting, sampling and testing after furnace burden is melted down, adjusting molten iron to required components according to the test result, heating the molten iron to 1480 ℃, then adding ferromanganese and ferrosilicon for deoxidation, slagging off, finally adding ferrotitanium, ferrovanadium and rare earth for modification treatment, and finally deoxidizing with aluminum;
(2) adopting resin to make sand mould, placing chilling block at the position of the isolating tongue of the sheath wood mould, and filling sand for moulding; after the mold is manufactured, coating zircon powder alcohol paint on the casting mold, and then core setting and mold assembling;
(3) controlling the temperature of the molten iron in the step (1) to be 1380 ℃ for pouring;
(4) adopting a quenching and tempering treatment process, controlling the temperature rise speed at 32 ℃/h, carrying out step heat preservation for 2 hours in a temperature range of 300 ℃, wherein the quenching temperature is 1000 ℃, and the heat preservation time is 2 hours; tempering temperature is 250 ℃, and the heat preservation time is 3 hours;
(5) after the impeller is formed, coating slurry for forming a corrosion-resistant layer on the surface of the impeller, wherein the coating thickness is 0.3mm, then placing the impeller in a vacuum drying oven at 20 ℃ for drying for 1 hour, and then placing the impeller in a vacuum drying oven at 60 ℃ and the vacuum degree of 0.05Mpa for baking for 1 hour;
(6) and (3) burning the surface of the impeller in the step (5) by adopting a mixed gas of hydrogen and methane, wherein the burning time is 10s, and thus the slurry pump impeller is obtained.
The slurry pump impeller taking the high-chromium cast iron as the body comprises the following components in percentage: 2.5% of C, 25% of Cr, 0.3% of Si, 0.02% of Re, 0.6% of Mo, 0.6% of Cu, 0.4% of Mn, 0.6% of Ni, 1.2% of W, 0.03% of B, 0.05% of Ti, 0.05% of V and the balance of Fe;
the slurry for forming a corrosion-resistant layer includes:
20kg of polyvinylpyrrolidone (BASF K85, Germany) and micron-sized alumina (available from KR-Al, Inc. of Nano science and technology, Inc. of Anhui Kerun
2O
3-3)12kg of nano-alumina (available from KR-Al, Inc., of Nano science and technology, Inc., of Anhui Kerun
2O
3-1)36kg, 3kg of surfactant lauric acid polyoxyethylene-9 fat, 0.5kg of dispersant calcium lignosulfonate, and 0.05kg of nickel powder (available from Changshajou metallic materials Co., Ltd., trade name LNC-I (particle size of 0.4 μm)).
The preparation method of the slurry for forming the corrosion-resistant layer comprises the following steps:
s1: weighing micrometer aluminum oxide (KR-Al from Anhui Kerun nanometer technology Co., Ltd.)
2O
3-3), nano-alumina (available from KR-Al, a science and technology ltd, lub, Anhui, Inc
2O
3-1) and nickel powder (purchased from Changsha Liyou metal materials Co., Ltd., under the brand name LNC-I (particle size of 0.4 μm)), uniformly mixing in a high-speed mixer, then blanking into a mixing barrel, adding ethanol, surfactant lauric acid polyoxyethylene-9 ester and dispersant calcium lignosulfonate, and performing ultrasonic dispersion for 20min to obtain a mixed solution A;
s2: polyvinylpyrrolidone (BASF K85, germany) was added with stirring, and after the addition was completed, stirring was continued for 10min to obtain a slurry for forming a corrosion-resistant layer.
Example 3
The preparation method of the slurry pump impeller comprises the following steps:
(1) the ingredients are prepared according to the following formula: 25% of returned materials, 15% of high-carbon ferrochrome, 15% of low-carbon ferrochrome, 40% of scrap steel and 5% of pig iron;
adding the raw materials into an induction furnace for smelting, sampling and testing after furnace burden is melted down, adjusting molten iron to required components according to the test result, heating the molten iron to 1500 ℃, then adding ferromanganese and ferrosilicon for deoxidation, slagging off, finally adding ferrotitanium, ferrovanadium and rare earth for modification treatment, and finally deoxidizing with aluminum;
(2) adopting resin to make sand mould, placing chilling block at the position of the isolating tongue of the sheath wood mould, and filling sand for moulding; after the mold is manufactured, coating zircon powder alcohol paint on the casting mold, and then core setting and mold assembling;
(3) controlling the temperature of the molten iron in the step (1) to be 1410 ℃ for pouring;
(4) adopting a quenching and tempering treatment process, controlling the temperature rise speed at 35 ℃/h, carrying out step heat preservation for 2 hours in a temperature range of 700 ℃, carrying out quenching temperature at 1020 ℃, and carrying out heat preservation for 3 hours; tempering temperature is 250 ℃, and the heat preservation time is 5 hours;
(5) after the impeller is formed, coating slurry for forming a corrosion-resistant layer on the surface of the impeller, wherein the coating thickness is 0.3mm, then placing the impeller in a vacuum drying oven at the room temperature of 30 ℃ for drying for 2 hours, and then placing the impeller in the vacuum drying oven at the vacuum degree of 0.30Mpa and the temperature of 70 ℃ for baking for 3 hours;
(6) and (3) burning the surface of the impeller in the step (5) by adopting a mixed gas of hydrogen and methane, wherein the burning time is 15s, and thus the slurry pump impeller is obtained.
The slurry pump impeller taking the high-chromium cast iron as the body comprises the following components in percentage: 3.6 percent of C, 30 percent of Cr, 0.5 percent of Si, 0.04 percent of Re, 1.0 percent of Mo, 0.8 percent of Cu, 0.7 percent of Mn, 0.8 percent of Ni, 1.8 percent of W, 0.05 percent of B, 0.15 percent of Ti, 0.15 percent of V and the balance of Fe;
the slurry for forming a corrosion-resistant layer includes:
35kg of polyvinylpyrrolidone (BASF K85, Germany) and micron-sized alumina (available from KR-Al, Inc., nano technology, Inc., Run, Ki, of Anhui Ke
2O
3-3)18kg of nano-alumina (available from KR-Al, Inc., of Nano science and technology, Inc., of Anhui Kerun
2O
3-1)90kg, 8kg of surfactant lauric acid polyoxyethylene-9 fat, 2kg of dispersant calcium lignosulfonate, and 0.1kg of nickel powder (available from Changsha Liyou metallic materials Co., Ltd., brand LNC-I (particle size of 0.4 μm)).
The preparation method of the slurry for forming the corrosion-resistant layer comprises the following steps:
s1: weighing micrometer aluminum oxide (KR-Al from Anhui Kerun nanometer technology Co., Ltd.)
2O
3-3), nano-alumina (available from KR-Al, a science and technology ltd, lub, Anhui, Inc
2O
3-1) and nickel powder (fromChangsha Liyou metal material Co., Ltd, the trade name of LNC-I (particle size of 0.4 μm)), and the materials are uniformly mixed in a high-speed mixer, then the materials are fed into a mixing barrel, ethanol, surfactant lauric acid polyoxyethylene-9 ester and dispersant calcium lignosulfonate are added, and ultrasonic dispersion is carried out for 30min to obtain a mixed solution A;
s2: polyvinylpyrrolidone (BASF K85, germany) was added with stirring, and after the addition was completed, stirring was continued for 20min to obtain a slurry for forming a corrosion-resistant layer.
Comparative example 1
This example was substantially the same as the slurry pump impeller of example 1, except that the slurry for forming the corrosion-resistant layer contained no micron-scale alumina, only nanometer-scale alumina, and the remainder was unchanged, to obtain the slurry pump impeller.
Comparative example 2
This example was substantially the same as the slurry pump impeller of example 1, except that the slurry for forming the corrosion-resistant layer contained no nano-alumina, only micron-alumina, and the remainder was unchanged, to give the slurry pump impeller.
Comparative example 3
The present embodiment is substantially the same as the preparation method of the slurry pump impeller of embodiment 1, except that, in step (6), the slurry pump impeller is prepared without burning the surface of the impeller with a mixed gas of hydrogen and methane, and the remainder is unchanged.
And respectively carrying out erosion abrasion tests on the slurry pump impeller obtained in the embodiment, wherein the erosion conditions are as follows: the erosion speed is 10m/s, the erosion angle is 70 degrees, and the erosion time is continuous for 48 hours, then the surface condition of the slurry pump impeller is observed, and whether the stripping phenomenon exists is observed.
Tests show that the impeller of the slurry pump prepared in the embodiment 1-3 has a perfect surface and does not have a stripping phenomenon;
the impeller of the slurry pump prepared in the comparative example 1-2 has a small amount of stripping phenomenon after 48 hours;
the impeller of the slurry pump prepared in the comparative example 3 has more peeling phenomenon after 48 hours.
Based on the test results, the impeller of the slurry pump provided by the invention has excellent impact resistance and corrosion resistance.
The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A preparation method of a slurry pump impeller is characterized by comprising the following steps: the method comprises the following steps:
(1) the ingredients are prepared according to the following formula: 25% of returned materials, 15% of high-carbon ferrochrome, 15% of low-carbon ferrochrome, 40% of scrap steel and 5% of pig iron;
adding the raw materials into an induction furnace for smelting, sampling and testing after furnace burden is melted down, adjusting molten iron to required components according to the test result, heating the molten iron to 1480-1500 ℃, then adding ferromanganese and ferrosilicon for deoxidation, slagging off, finally adding ferrotitanium, ferrovanadium and rare earth for modification, and finally deoxidizing with aluminum;
(2) adopting resin sand for molding, placing chilling blocks at the position of the isolating tongue of the sheath wood model, and filling sand for molding; after the mold is manufactured, coating zircon powder alcohol paint on the casting mold, and then core setting and mold assembling;
(3) controlling the temperature of the molten iron in the step (1) to be 1380-1410 ℃ for pouring;
(4) a quenching and tempering treatment process is adopted, the temperature rise speed is controlled to be 32-35 ℃/h, the temperature is kept for 1-2 hours in a step mode within the temperature range of 200-700 ℃, the quenching temperature is 1000-1020 ℃, and the temperature keeping time is 1-3 hours; tempering temperature is 250 ℃, and heat preservation time is 3-5 hours;
(5) after the impeller is formed, brushing slurry for forming a corrosion-resistant layer on the surface of the impeller, then placing the impeller in a room temperature of 20-30 ℃ for airing for 1-2 hours, and then placing the impeller in a vacuum drying oven with the vacuum degree of 0.05-0.30 MPa and the temperature of 60-70 ℃ for baking for 1-3 hours;
(6) firing the surface of the impeller in the step (5) by using a mixed gas of hydrogen and methane, wherein the firing time is 10-15 s, so as to obtain the slurry pump impeller;
the slurry for forming the corrosion-resistant layer comprises the following raw materials in parts by weight: 20-35 parts of polyvinylpyrrolidone, 12-18 parts of micron-grade alumina, 36-90 parts of nano-grade alumina, 3-8 parts of surfactant, 0.5-2 parts of dispersant and 0.05-0.1 part of nickel powder.
2. The method for preparing an impeller of a slurry pump according to claim 1, wherein: the grain size of the micron-grade alumina is 0.2-10 mu m;
the grain size of the nano-alumina is 5-50 nm;
the mass ratio of the micron-grade alumina to the nanometer-grade alumina is 1: (3-5).
3. The method for preparing an impeller of a slurry pump according to claim 1, wherein: the surfactant is one or more of fatty alcohol polyoxyethylene-3 ether, lauric acid polyoxyethylene-9 ester, potassium monododecyl phosphate, lecithin, amino acid type and betaine type according to any proportion.
4. The method for preparing an impeller of a slurry pump according to claim 1, wherein: the dispersant is one or a mixture of more than one of calcium lignosulphonate, sodium tripolyphosphate, sodium hexametaphosphate, polysulfonate and polycarboxylate.
5. The method for preparing an impeller of a slurry pump according to claim 1, wherein: the particle size of the nickel powder is 0.1-5 mu m.
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| CN110666468A (en) * | 2019-08-23 | 2020-01-10 | 徐州东坤耐磨材料有限公司 | Preparation method of wear-resistant impeller |
| CN111334791B (en) * | 2020-04-08 | 2022-04-05 | 江苏拜欧尼克智能科技有限公司 | Bionic design-based slurry pump blade surface non-uniform strengthening method |
| CN112779457A (en) * | 2020-12-21 | 2021-05-11 | 河北领启机械设备有限公司 | Preparation method of slurry pump impeller |
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