CN108708873A - A kind of slurry pump impeller of high-strength corrosion-resisting - Google Patents

A kind of slurry pump impeller of high-strength corrosion-resisting Download PDF

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Publication number
CN108708873A
CN108708873A CN201810467837.5A CN201810467837A CN108708873A CN 108708873 A CN108708873 A CN 108708873A CN 201810467837 A CN201810467837 A CN 201810467837A CN 108708873 A CN108708873 A CN 108708873A
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slurry pump
pump impeller
corrosion
corrosion layer
alumina
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杨小民
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Anhui Sanhuan Pump Co Ltd
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Anhui Sanhuan Pump Co Ltd
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Priority to CN201810467837.5A priority Critical patent/CN108708873A/en
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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
    • 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
    • B22C9/04—Use of lost patterns
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D139/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Coating compositions based on derivatives of such polymers
    • C09D139/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
    • C09D139/06—Homopolymers or copolymers of N-vinyl-pyrrolidones
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C09D5/10—Anti-corrosive paints containing metal dust
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • 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
    • C21D1/06—Surface hardening
    • C21D1/08—Surface hardening with flames
    • 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
    • C21D5/00—Heat treatments of cast-iron
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0862—Nickel
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K

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  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention belongs to slurry pump technical fields, and in particular to a kind of slurry pump impeller of high-strength corrosion-resisting, the slurry pump impeller is using rich chromium cast iron as ontology, it is characterised in that：The body surface is provided with the anti-corrosion layer that thickness is 0.1~0.5mm；The anti-corrosion layer includes following raw material：Polyvinylpyrrolidone, micron grade aluminum oxide, alumina in Nano level, surfactant, dispersant, nickel powder；The present invention is brushed in such a way that micron grade aluminum oxide and alumina in Nano level are compound in the surface of slurry pump impeller, the large and small other aluminium oxide of grain-size grade not only ensures compactness particle-filled in anti-corrosion layer, and, pass through the high temperature sintering of hydrogen and methane blended gas, improve the bonding state of the particle filled composite interface on anti-corrosion layer surface, improve the Percentage bound of particle, optimize the stress state of interface, the corrosion resistance and impact strength for ensuring slurry pump impeller, extend the service life of slurry pump impeller.

Description

A kind of slurry pump impeller of high-strength corrosion-resisting
Technical field
The invention belongs to slurry pump technical fields, and in particular to a kind of slurry pump impeller of high-strength corrosion-resisting.
Background technology
Pulp pump typically refers to make the increased one kind of solid, liquid blending agent energy by the turning effort of the impeller by pump Machinery is mainly used for the industry fields such as mine, power plant, dredging, metallurgy, chemical industry, building materials and oil.The operation logic of Pulp pump It is that under the influence of centrifugal force, liquid is thrown to outer rim from impeller center and obtains energy, to leave vane edge entrance at a high speed Volute pump case.In volute pump case, liquid slows down due to being gradually expanded for runner, and part kinetic energy is changed into static energy, Discharge line is finally flowed into higher pressure, is sent to needing place.When liquid flows to outer rim by impeller center, in impeller center Certain vacuum is formed, since the pressure of storage tank ullage is more than the pressure at pump intake, liquid is just continuously pressed into impeller In.
The impeller of Pulp pump is in operation process, due to by high-speed and high-temperature and carrying the ore pulp slurries of hard particles It washes away so that impeller surface material serious wear, under such harsh operating mode, the service life of impeller is very short, needs frequent It replaces to ensure reliable, the stable operation of Pulp pump, and the frequent of impeller replaces the interruption that will necessarily cause production, greatly drops Low production efficiency.Wear-resistant material is researched and developed as a result, to reduce the abrasion of impeller in use, extends Pulp pump leaf The service life of wheel is very important project, and the important content of technical staff's research both at home and abroad at present.
In existing technology, it is wear-resisting that ordinary white cast iron, ni-hard cast iron and rich chromium cast iron Cr15Mo3 etc. are successively used Material, the new materials such as present ceramic material, austempered cast iron ADI, high molecular material and the rich chromium cast iron containing Cr20% or more Start by local use.But the alloy cast irons such as hard nickel, Gao Ge, copper-manganese having now been developed, there is following different to lack It falls into：(1), low-alloy chilled cast iron, at low cost, service life is relatively short；(2), ni-hard cast iron, service life is long, nickel resources Few, price is high, cannot largely use；(3), rich chromium cast iron, wearability are higher than alloy white cast iron, and chromium resource is in abundant, price It is moderate, using than wide；(4), austempered ductile iron ADI, high comprehensive performance, hardness are less than rich chromium cast iron, there is excellent casting Performance is made, heat treatment process is simple, light-weight, is served only for small-sized Pulp pump；(5), composite material, have excellent wearability, Corrosion resistance and impact resistance, while also having the characteristics that manufacturing cost is low, but production technology is relative complex；(6), macromolecule material Material, preparation process is simple and convenient, energy saving, superior performance, but expensive, and production cost can be substantially improved.
Invention content
For the problems of the prior art, the purpose of the present invention is to provide a kind of high intensity, corrosion resistant Pulp pump leaves Wheel extends the service life of slurry pump impeller, improves the shortcomings that overcoming existing slurry pump impeller intensity deficiency, easily corrode The replacement cycle of slurry pump impeller.
To achieve the goals above, the present invention is achieved by the following scheme：
A kind of slurry pump impeller of high-strength corrosion-resisting, the slurry pump impeller are described using rich chromium cast iron as ontology Body surface be provided with thickness be 0.1~0.5mm anti-corrosion layer；
The anti-corrosion layer includes following raw material：Polyvinylpyrrolidone, micron grade aluminum oxide, alumina in Nano level, Surfactant, dispersant, nickel powder.
Preferably, the grain size of the micron grade aluminum oxide is 0.2~10 μm；
The grain size of the alumina in Nano level is 5~50nm；
The mass ratio of the micron grade aluminum oxide and alumina in Nano level is 1：(3~5).
Preferably, the surfactant is -3 ether of aliphatic alcohol polyethenoxy, -9 fat of lauric acid polyoxyethylene, single 12 One or more kinds of mixtures in any proportion in alkyl phosphate potassium, lecithin, amino acid pattern, betaine type.
Preferably, the dispersant is calcium lignosulfonate, sodium tripolyphosphate, calgon, polysulfonate and poly- carboxylic One or more kinds of mixtures in hydrochlorate.
Preferably, the grain size of the nickel powder is 0.1~5 μm.
Preferably, the anti-corrosion layer includes the raw material of following parts by weight：It is 20~35 parts of polyvinylpyrrolidone, micro- 12~18 parts of meter level aluminium oxide, 36~90 parts of alumina in Nano level, 3~8 parts of surfactant, 0.5~2 part of dispersant, nickel powder 0.05~0.1 part.
In the present invention, the preparation method for being used to form the slurry of anti-corrosion layer includes the following steps：
(1) a micron grade aluminum oxide, alumina in Nano level and nickel powder are weighed by formula ratio, is mixed in high-speed mixer equal It is even, then in blanking to mixing tank, solvent, surfactant and dispersant, 20~30min of ultrasonic disperse is added and is mixed Liquid A；
(2) polyvinylpyrrolidone is added in the state of stirring, continues 10~20min of stirring after adding, is used In the slurry for forming anti-corrosion layer.
In the present invention, the preparation method of the slurry pump impeller of the high-strength corrosion-resisting includes the following steps：
(1) it presses formula as below and carries out dispensing：Foundry returns 25%, high carbon ferro-chrome 15%, low-carbon ferrochromium 15%, steel scrap 40%, The pig iron 5%；
Above-mentioned raw materials are added in electric induction furnace and carry out melting, sample examination are carried out after furnace charge is melting down, according to chemical examination As a result molten iron is adjusted to require ingredient, molten iron is warming up to 1480~1500 DEG C, ferromanganese, ferrosilicon progress deoxidation is then added, It skims, is eventually adding ferrotianium, vanadium iron, rare earth and carries out Metamorphism treatment, final deoxidizing is carried out with aluminium；
(2) sand mold is made using resin, chill, filling moulding is placed at the cut water of sheath die model；After having made type, casting mold applies Brush zirconium English powder alcohol paint, lower core, mould assembling；
(3) it is 1380~1410 DEG C in temperature by the molten iron control in step (1) to pour into a mould；
(4) using quenching add-back fire treatment process, heating rate is controlled in 32~35 DEG C/h, 200~700 DEG C of humidity provinces Between, ladder keeps the temperature 1~2 hour, and hardening heat is 1000~1020 DEG C, and soaking time is 1~3 hour；250 DEG C of temperature, Soaking time is 3~5 hours；
(5) after Impeller Shaping, the slurry for being used to form anti-corrosion layer is brushed on its surface, is subsequently placed in 20~30 DEG C It dries 1~2 hour, is then placed in the vacuum drying chamber that vacuum degree is 0.05~0.30Mpa, temperature is 60~70 DEG C at room temperature Baking 1~3 hour；
(6) mixed gas of hydrogen and methane is used to carry out calcination processing, calcination time to the impeller surface in step (5) It is 10~15s to get the slurry pump impeller of the high-strength corrosion-resisting.
Include that the group of following percentage composition is grouped as using rich chromium cast iron as the slurry pump impeller of ontology in the present invention：C 2.5 ~3.6%, Cr 25~30%, Si 0.3~0.5%, Re 0.02~0.04%, Mo 0.6~1.0%, Cu 0.6~ 0.8%, Mn 0.4~0.7%, Ni 0.6~0.8%, W 1.2~1.8%, B 0.03~0.05%, Ti 0.05~ 0.15%, 0.05~0.15% V, remaining is iron.
Compared with prior art, the present invention has the following technical effects：
In the present invention, the table in slurry pump impeller is brushed in such a way that micron grade aluminum oxide and alumina in Nano level are compound Face, which not only ensures compactness particle-filled in anti-corrosion layer, moreover, passing through hydrogen With the high temperature sintering of methane blended gas, the bonding state of the particle filled composite interface on anti-corrosion layer surface is improved, is improved The Percentage bound of particle optimizes the stress state of interface, to effectively raise the intensity and toughness of anti-corrosion layer, it is ensured that The corrosion resistance and impact strength of slurry pump impeller, extends the service life of slurry pump impeller.
Specific implementation mode
In order to make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, tie below Specific embodiment is closed, the present invention is furture elucidated.
The present invention provides a kind of slurry pump impeller of high-strength corrosion-resisting, the slurry pump impeller is made with rich chromium cast iron For ontology, the body surface is provided with the anti-corrosion layer that thickness is 0.1~0.5mm；
The anti-corrosion layer includes following raw material：Polyvinylpyrrolidone, micron grade aluminum oxide, alumina in Nano level, Surfactant, dispersant, nickel powder.
In the present invention, the polyvinylpyrrolidone is used for micron grade aluminum oxide and nanoscale as binder The preliminary bonding of aluminium, the polyvinylpyrrolidone are a kind of non-ionic macromolecule compounds, can not only be dissolved in water, but also can To be dissolved in most organic solvent, toxicity is very low.Specifically, the polyvinylpyrrolidone can be enumerated such as German BASF K85、K90。
In the present invention, the grain size of the micron grade aluminum oxide is 0.2~10 μm；
The grain size of the alumina in Nano level is 5~50nm；
The mass ratio of the micron grade aluminum oxide and alumina in Nano level is 1：(3~5).
In the present invention, the effect of surfactant is to reduce the surface free energy of alumina powder, improves aluminium oxide Dispersion performance；In addition, the surfactant can also enter in the surface pore of aluminium oxide particles, reduce in calcination The stress concentration in the hole of appearance, the phenomenon that avoiding the occurrence of peeling, crack.Preferably, surfactant of the present invention For -3 ether of aliphatic alcohol polyethenoxy, -9 fat of lauric acid polyoxyethylene, Monododecylphosphate potassium, lecithin, amino acid pattern, sweet tea One or more kinds of mixtures in any proportion in dish alkaline.
In the present invention, in order to further improve the dispersibility of aluminium oxide, it is used to form in the slurry of anti-corrosion layer also Containing dispersant, the dispersant is calcium lignosulfonate, sodium tripolyphosphate, calgon, polysulfonate and polycarboxylic acids One or more kinds of mixtures in salt.
In the present invention, the catalyst of nickel powder acted on as methane cracking, in hydrogen and methane blended gas calcination In the process, the presence based on nickel powder, in the Surface Creation carbon nanotube of anti-corrosion layer, which has higher intensity, During the use of slurry pump impeller, the shield effectiveness to pumped (conveying) medium is further improved, in of the invention, the nickel powder Grain size be 0.1~5 μm, specifically, nickel powder of the present invention is purchased from the super of Changsha Li You metal materials Co., Ltd production Thin globular powdered nickel, the specific trade mark is LNC-I (grain size is 0.4 μm), (grain size is by LNC-II (grain size is 0.8 μm), LNC-III 2.0 μm), LNC-IV (more 4.5 μm of grain size).
In the present invention, the formulation content of the anti-corrosion layer can select in a wider scope, in order to ensure described Anti-corrosion layer has excellent corrosion resistance and impact strength, and the anti-corrosion layer includes the original of following parts by weight Material：12~18 parts of 20~35 part, micron grade aluminum oxide of polyvinylpyrrolidone, 36~90 parts of alumina in Nano level, surface-active 3~8 parts of agent, 0.5~2 part of dispersant, 0.05~0.1 part of nickel powder.
In the present invention, the preparation method for being used to form the slurry of anti-corrosion layer includes the following steps：
(1) a micron grade aluminum oxide, alumina in Nano level and nickel powder are weighed by formula ratio, is mixed in high-speed mixer equal It is even, then in blanking to mixing tank, solvent, surfactant and dispersant, 20~30min of ultrasonic disperse is added and is mixed Liquid A；
(2) polyvinylpyrrolidone is added in the state of stirring, continues 10~20min of stirring after adding, is used In the slurry for forming anti-corrosion layer.
The carrier that the solvent is mixed as material, the present invention do not have it special requirement, can select ethyl alcohol, first One kind in alcohol, acetone.
Provided by the present invention for forming the slurry preparation process of anti-corrosion layer, the only mixing of material, the mistake of stirring Journey, it is simple and convenient, it is easily operated.
In the present invention, the preparation method of the slurry pump impeller of the high-strength corrosion-resisting includes the following steps：
(1) it presses formula as below and carries out dispensing：Foundry returns 25%, high carbon ferro-chrome 15%, low-carbon ferrochromium 15%, steel scrap 40%, The pig iron 5%；
Above-mentioned raw materials are added in electric induction furnace and carry out melting, sample examination are carried out after furnace charge is melting down, according to chemical examination As a result molten iron is adjusted to require ingredient, molten iron is warming up to 1480~1500 DEG C, ferromanganese, ferrosilicon progress deoxidation is then added, It skims, is eventually adding ferrotianium, vanadium iron, rare earth and carries out Metamorphism treatment, final deoxidizing is carried out with aluminium；
(2) sand mold is made using resin, chill, filling moulding is placed at the cut water of sheath die model；After having made type, casting mold applies Brush zirconium English powder alcohol paint, lower core, mould assembling；
(3) it is 1380~1410 DEG C in temperature by the molten iron control in step (1) to pour into a mould；
(4) using quenching add-back fire treatment process, heating rate is controlled in 32~35 DEG C/h, 200~700 DEG C of humidity provinces Between, ladder keeps the temperature 1~2 hour, and hardening heat is 1000~1020 DEG C, and soaking time is 1~3 hour；250 DEG C of temperature, Soaking time is 3~5 hours；
(5) after Impeller Shaping, the slurry for being used to form anti-corrosion layer is brushed on its surface, is subsequently placed in 20~30 DEG C It dries 1~2 hour, is then placed in the vacuum drying chamber that vacuum degree is 0.05~0.30Mpa, temperature is 60~70 DEG C at room temperature Baking 1~3 hour；
(6) mixed gas of hydrogen and methane is used to carry out calcination processing, calcination time to the impeller surface in step (5) It is 10~15s to get the slurry pump impeller of the high-strength corrosion-resisting.
Include that the group of following percentage composition is grouped as using rich chromium cast iron as the slurry pump impeller of ontology in the present invention：C 2.5 ~3.6%, Cr 25~30%, Si 0.3~0.5%, Re 0.02~0.04%, Mo 0.6~1.0%, Cu 0.6~ 0.8%, Mn 0.4~0.7%, Ni 0.6~0.8%, W 1.2~1.8%, B 0.03~0.05%, Ti 0.05~ 0.15%, 0.05~0.15% V, remaining is iron.
The advantages of slurry pump impeller provided by the invention, is described further below by way of specific embodiment.
Embodiment 1
A kind of slurry pump impeller of high-strength corrosion-resisting, preparation method includes the following steps：
(1) it presses formula as below and carries out dispensing：Foundry returns 25%, high carbon ferro-chrome 15%, low-carbon ferrochromium 15%, steel scrap 40%, The pig iron 5%；
Above-mentioned raw materials are added in electric induction furnace and carry out melting, sample examination are carried out after furnace charge is melting down, according to chemical examination As a result molten iron is adjusted to require ingredient, molten iron is warming up to 1480 DEG C, ferromanganese, ferrosilicon progress deoxidation is then added, skims, most Ferrotianium, vanadium iron, rare earth are added afterwards and carries out Metamorphism treatment, final deoxidizing is carried out with aluminium；
(2) sand mold is made using resin, chill, filling moulding is placed at the cut water of sheath die model；After having made type, casting mold applies Brush zirconium English powder alcohol paint, lower core, mould assembling；
(3) it is 1400 DEG C in temperature by the molten iron control in step (1) to pour into a mould；
(4) using quenching add-back fire treatment process, heating rate control is in 32 DEG C/h, and in 200 DEG C of temperature ranges, ladder is protected Temperature 2 hours, hardening heat are 1000 DEG C, and soaking time is 2 hours；250 DEG C of temperature, soaking time are 4 hours；
(5) after Impeller Shaping, the slurry for being used to form anti-corrosion layer is brushed on its surface, brushing thickness is 0.3mm, so It is placed on 25 DEG C to dry at room temperature 2 hours, then be placed in the vacuum drying chamber that vacuum degree is 0.20Mpa, temperature is 65 DEG C Baking 2 hours；
(6) mixed gas of hydrogen and methane is used to carry out calcination processing, calcination time to the impeller surface in step (5) It is 10s to get the slurry pump impeller of the high-strength corrosion-resisting.
Above-mentioned includes that the group of following percentage composition is grouped as using rich chromium cast iron as the slurry pump impeller of ontology：C 3%, Cr 28%, Si 0.4%, Re 0.03%, Mo 0.8%, Cu 0.7%, Mn 0.5%, Ni 0.7%, W 1.5%, B 0.04%, Ti 0.1%, V 0.1%, remaining is iron；
The anti-corrosion layer slurry that is used to form includes：
Polyvinylpyrrolidone (German BASF K85) 28kg, micron grade aluminum oxide (have purchased from Anhui Ke Run nanosecond science and technology Limit company KR-Al2O3- 3) 15kg, alumina in Nano level (are purchased from Anhui Ke Run nanosecond science and technology Co., Ltd KR-Al2O3-1) 45kg, -9 fat 5kg of surfactant lauric acid polyoxyethylene, dispersant calcium lignosulfonate 1.2kg, nickel powder are (vertical purchased from Changsha Excellent metal material Co., Ltd, the trade mark are LNC-I (grain size is 0.4 μm)) 0.08kg.
The preparation method of the slurry for being used to form anti-corrosion layer is：
S1：A micron grade aluminum oxide, which is weighed, by formula ratio (is purchased from Anhui Ke Run nanosecond science and technology Co., Ltd KR-Al2O3- 3) it, receives Meter level aluminium oxide (is purchased from Anhui Ke Run nanosecond science and technology Co., Ltd KR-Al2O3- 1) and nickel powder (founds excellent metal material purchased from Changsha Co., Ltd, the trade mark are LNC-I (grain size is 0.4 μm)), it is uniformly mixed in high-speed mixer, then in blanking to mixing tank, Ethyl alcohol, -9 fat of surfactant lauric acid polyoxyethylene and dispersant calcium lignosulfonate, ultrasonic disperse 20min is added to obtain Mixed liquor A；
S2：Polyvinylpyrrolidone (German BASF K85) is added in the state of stirring, continues to stir after adding 15min obtains the slurry for being used to form anti-corrosion layer.
Embodiment 2
A kind of slurry pump impeller of high-strength corrosion-resisting, preparation method includes the following steps：
(1) it presses formula as below and carries out dispensing：Foundry returns 25%, high carbon ferro-chrome 15%, low-carbon ferrochromium 15%, steel scrap 40%, The pig iron 5%；
Above-mentioned raw materials are added in electric induction furnace and carry out melting, sample examination are carried out after furnace charge is melting down, according to chemical examination As a result molten iron is adjusted to require ingredient, molten iron is warming up to 1480 DEG C, ferromanganese, ferrosilicon progress deoxidation is then added, skims, most Ferrotianium, vanadium iron, rare earth are added afterwards and carries out Metamorphism treatment, final deoxidizing is carried out with aluminium；
(2) sand mold is made using resin and places chill filling moulding at the cut water of sheath die model；After having made type, casting mold brushing Zirconium English powder alcohol paint, lower core, mould assembling；
(3) it is 1380 DEG C in temperature by the molten iron control in step (1) to pour into a mould；
(4) using quenching add-back fire treatment process, heating rate control is in 32 DEG C/h, and in 300 DEG C of temperature ranges, ladder is protected Temperature 2 hours, hardening heat are 1000 DEG C, and soaking time is 2 hours；250 DEG C of temperature, soaking time are 3 hours；
(5) after Impeller Shaping, the slurry for being used to form anti-corrosion layer is brushed on its surface, brushing thickness is 0.3mm, so It is placed on 20 DEG C to dry at room temperature 1 hour, then be placed in the vacuum drying chamber that vacuum degree is 0.05Mpa, temperature is 60 DEG C Baking 1 hour；
(6) mixed gas of hydrogen and methane is used to carry out calcination processing, calcination time to the impeller surface in step (5) It is 10s to get the slurry pump impeller of the high-strength corrosion-resisting.
Above-mentioned includes that the group of following percentage composition is grouped as using rich chromium cast iron as the slurry pump impeller of ontology：C 2.5%, Cr 25%, Si 0.3%, Re 0.02%, Mo 0.6%, Cu 0.6%, Mn 0.4%, Ni 0.6%, W 1.2%, B 0.03%, Ti 0.05%, V 0.05%, remaining is iron；
The anti-corrosion layer slurry that is used to form includes：
Polyvinylpyrrolidone (German BASF K85) 20kg, micron grade aluminum oxide (have purchased from Anhui Ke Run nanosecond science and technology Limit company KR-Al2O3- 3) 12kg, alumina in Nano level (are purchased from Anhui Ke Run nanosecond science and technology Co., Ltd KR-Al2O3-1) 36kg, -9 fat 3kg of surfactant lauric acid polyoxyethylene, dispersant calcium lignosulfonate 0.5kg, nickel powder are (vertical purchased from Changsha Excellent metal material Co., Ltd, the trade mark are LNC-I (grain size is 0.4 μm)) 0.05kg.
The preparation method of the slurry for being used to form anti-corrosion layer is：
S1：A micron grade aluminum oxide, which is weighed, by formula ratio (is purchased from Anhui Ke Run nanosecond science and technology Co., Ltd KR-Al2O3- 3) it, receives Meter level aluminium oxide (is purchased from Anhui Ke Run nanosecond science and technology Co., Ltd KR-Al2O3- 1) and nickel powder (founds excellent metal material purchased from Changsha Co., Ltd, the trade mark are LNC-I (grain size is 0.4 μm)), it is uniformly mixed in high-speed mixer, then in blanking to mixing tank, Ethyl alcohol, -9 fat of surfactant lauric acid polyoxyethylene and dispersant calcium lignosulfonate, ultrasonic disperse 20min is added to obtain Mixed liquor A；
S2：Polyvinylpyrrolidone (German BASF K85) is added in the state of stirring, continues to stir after adding 10min obtains the slurry for being used to form anti-corrosion layer.
Embodiment 3
A kind of slurry pump impeller of high-strength corrosion-resisting, preparation method includes the following steps：
(1) it presses formula as below and carries out dispensing：Foundry returns 25%, high carbon ferro-chrome 15%, low-carbon ferrochromium 15%, steel scrap 40%, The pig iron 5%；
Above-mentioned raw materials are added in electric induction furnace and carry out melting, sample examination are carried out after furnace charge is melting down, according to chemical examination As a result molten iron is adjusted to require ingredient, molten iron is warming up to 1500 DEG C, ferromanganese, ferrosilicon progress deoxidation is then added, skims, most Ferrotianium, vanadium iron, rare earth are added afterwards and carries out Metamorphism treatment, final deoxidizing is carried out with aluminium；
(2) sand mold is made using resin, chill, filling moulding is placed at the cut water of sheath die model；After having made type, casting mold applies Brush zirconium English powder alcohol paint, lower core, mould assembling；
(3) it is 1410 DEG C in temperature by the molten iron control in step (1) to pour into a mould；
(4) using quenching add-back fire treatment process, heating rate control is in 35 DEG C/h, and in 700 DEG C of temperature ranges, ladder is protected Temperature 2 hours, hardening heat are 1020 DEG C, and soaking time is 3 hours；250 DEG C of temperature, soaking time are 5 hours；
(5) after Impeller Shaping, the slurry for being used to form anti-corrosion layer is brushed on its surface, brushing thickness is 0.3mm, so It is placed on 30 DEG C to dry at room temperature 2 hours, then be placed in the vacuum drying chamber that vacuum degree is 0.30Mpa, temperature is 70 DEG C Baking 3 hours；
(6) mixed gas of hydrogen and methane is used to carry out calcination processing, calcination time to the impeller surface in step (5) It is 15s to get the slurry pump impeller of the high-strength corrosion-resisting.
Above-mentioned includes that the group of following percentage composition is grouped as using rich chromium cast iron as the slurry pump impeller of ontology：C 3.6%, Cr 30%, Si 0.5%, Re 0.04%, Mo 1.0%, Cu 0.8%, Mn 0.7%, Ni 0.8%, W 1.8%, B 0.05%, Ti 0.15%, V 0.15%, remaining is iron；
The anti-corrosion layer slurry that is used to form includes：
Polyvinylpyrrolidone (German BASF K85) 35kg, micron grade aluminum oxide (have purchased from Anhui Ke Run nanosecond science and technology Limit company KR-Al2O3- 3) 18kg, alumina in Nano level (are purchased from Anhui Ke Run nanosecond science and technology Co., Ltd KR-Al2O3-1) 90kg, -9 fat 8kg of surfactant lauric acid polyoxyethylene, dispersant calcium lignosulfonate 2kg, nickel powder (are stood excellent purchased from Changsha Metal material Co., Ltd, the trade mark are LNC-I (grain size is 0.4 μm)) 0.1kg.
The preparation method of the slurry for being used to form anti-corrosion layer is：
S1：A micron grade aluminum oxide, which is weighed, by formula ratio (is purchased from Anhui Ke Run nanosecond science and technology Co., Ltd KR-Al2O3- 3) it, receives Meter level aluminium oxide (is purchased from Anhui Ke Run nanosecond science and technology Co., Ltd KR-Al2O3- 1) and nickel powder (founds excellent metal material purchased from Changsha Co., Ltd, the trade mark are LNC-I (grain size is 0.4 μm)), it is uniformly mixed in high-speed mixer, then in blanking to mixing tank, Ethyl alcohol, -9 fat of surfactant lauric acid polyoxyethylene and dispersant calcium lignosulfonate, ultrasonic disperse 30min is added to obtain Mixed liquor A；
S2：Polyvinylpyrrolidone (German BASF K85) is added in the state of stirring, continues to stir after adding 20min obtains the slurry for being used to form anti-corrosion layer.
Comparative example 1
The preparation method of the present embodiment and the slurry pump impeller of embodiment 1 is essentially identical, unlike, it is described to be used to form Micron grade aluminum oxide is not contained in the slurry of anti-corrosion layer, only contains alumina in Nano level, remaining is constant, obtains the slurry Impeller of pump.
Comparative example 2
The preparation method of the present embodiment and the slurry pump impeller of embodiment 1 is essentially identical, unlike, it is described to be used to form Alumina in Nano level is not contained in the slurry of anti-corrosion layer, only contains micron order aluminium oxide, remaining is constant, obtains the slurry Impeller of pump.
Comparative example 3
The preparation method of the present embodiment and the slurry pump impeller of embodiment 1 is essentially identical, unlike, in step (6), no Calcination processing is carried out to impeller surface using the mixed gas of hydrogen and methane, remaining is constant, and the Pulp pump is prepared Impeller.
Slurry pump impeller is obtained to above-described embodiment and carries out erosion resistance tests respectively, the condition of erosion is：Erosion speed Be 70 ° for 10m/s, erosion angle, the erosion time is continuous 48 hours, then observe the surface condition of slurry pump impeller, observation is It is no to have peeling.
It is found through overtesting, the surface for the slurry pump impeller that embodiment 1-3 is prepared is intact, has no peeling；
There is a small amount of peeling after 48 hrs in the slurry pump impeller that the comparative example 1-2 is prepared；
There is more peeling after 48 hrs in the slurry pump impeller that the comparative example 3 is prepared.
Based on above-mentioned test result, slurry pump impeller provided by the invention has excellent protecting against shock, corrosion resistance.
The basic principles and main features and the features of the present invention of the present invention have been shown and described above.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes Change and improvement is both fallen in the range of claimed invention.The scope of protection of present invention is by appended claims And its equivalent thereof.

Claims (6)

1. a kind of slurry pump impeller of high-strength corrosion-resisting, the slurry pump impeller is using rich chromium cast iron as ontology, feature It is：The body surface is provided with the anti-corrosion layer that thickness is 0.1~0.5mm；
The anti-corrosion layer includes following raw material：Polyvinylpyrrolidone, micron grade aluminum oxide, alumina in Nano level, surface Activating agent, dispersant, nickel powder.
2. the slurry pump impeller of high-strength corrosion-resisting according to claim 1, it is characterised in that：The micron grade aluminum oxide Grain size be 0.2~10 μm；
The grain size of the alumina in Nano level is 5~50nm；
The mass ratio of the micron grade aluminum oxide and alumina in Nano level is 1：(3~5).
3. the slurry pump impeller of high-strength corrosion-resisting according to claim 1, it is characterised in that：The surfactant For -3 ether of aliphatic alcohol polyethenoxy, -9 fat of lauric acid polyoxyethylene, Monododecylphosphate potassium, lecithin, amino acid pattern, sweet tea One or more kinds of mixtures in any proportion in dish alkaline.
4. the slurry pump impeller of high-strength corrosion-resisting according to claim 1, it is characterised in that：The dispersant is wooden One or more kinds of mixtures in plain sulfoacid calcium, sodium tripolyphosphate, calgon, polysulfonate and polycarboxylate.
5. the slurry pump impeller of high-strength corrosion-resisting according to claim 1, it is characterised in that：The grain size of the nickel powder is 0.1~5 μm.
6. the slurry pump impeller of high-strength corrosion-resisting according to claim 1, it is characterised in that：The anti-corrosion layer packet Include the raw material of following parts by weight：12~18 parts of 20~35 part, micron grade aluminum oxide of polyvinylpyrrolidone, alumina in Nano level 36~90 parts, 3~8 parts of surfactant, 0.5~2 part of dispersant, 0.05~0.1 part of nickel powder.
CN201810467837.5A 2018-05-16 2018-05-16 A kind of slurry pump impeller of high-strength corrosion-resisting Pending CN108708873A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111136217A (en) * 2020-03-05 2020-05-12 无锡市灵通铸造有限公司 Casting process of generator impeller
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

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1597617A (en) * 2004-09-29 2005-03-23 哈尔滨工业大学 Sintered metal powder coating material and method of preparing metal ceramic anti corrosive coating
CN103556042A (en) * 2013-10-23 2014-02-05 德州宏森机械有限公司 Casting and thermal treatment technology for high-chromium iron on flow passage component of slurry pump
CN104403381A (en) * 2015-01-07 2015-03-11 苏州大学 Corrosion resistant ceramic paint and preparation method thereof
CN104446396A (en) * 2014-12-11 2015-03-25 中国石油大学(华东) Preparation method of micro-nano composite aluminum oxide-titanium nitride-zirconium oxide-nickel-molybdenum ceramic material
CN104496430A (en) * 2014-12-25 2015-04-08 江苏晶晶新材料有限公司 Method for solving water bursting of alumina of different properties after mixing, shaping and roasting
CN105294137A (en) * 2015-12-08 2016-02-03 武汉科技大学 Disperse alumina micro powder and preparation method thereof
CN105602356A (en) * 2016-02-17 2016-05-25 合肥爱诺伟机械设备有限公司 Wear and corrosion resisting centrifugal pump impeller coating layer and preparation method and application thereof
CN107989822A (en) * 2017-12-29 2018-05-04 上海英佛曼纳米科技股份有限公司 A kind of hot-rolling water circulating pump impeller with high-performance antiscour wear-resistant nano coating resistant to chemical etching

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1597617A (en) * 2004-09-29 2005-03-23 哈尔滨工业大学 Sintered metal powder coating material and method of preparing metal ceramic anti corrosive coating
CN103556042A (en) * 2013-10-23 2014-02-05 德州宏森机械有限公司 Casting and thermal treatment technology for high-chromium iron on flow passage component of slurry pump
CN104446396A (en) * 2014-12-11 2015-03-25 中国石油大学(华东) Preparation method of micro-nano composite aluminum oxide-titanium nitride-zirconium oxide-nickel-molybdenum ceramic material
CN104496430A (en) * 2014-12-25 2015-04-08 江苏晶晶新材料有限公司 Method for solving water bursting of alumina of different properties after mixing, shaping and roasting
CN104403381A (en) * 2015-01-07 2015-03-11 苏州大学 Corrosion resistant ceramic paint and preparation method thereof
CN105294137A (en) * 2015-12-08 2016-02-03 武汉科技大学 Disperse alumina micro powder and preparation method thereof
CN105602356A (en) * 2016-02-17 2016-05-25 合肥爱诺伟机械设备有限公司 Wear and corrosion resisting centrifugal pump impeller coating layer and preparation method and application thereof
CN107989822A (en) * 2017-12-29 2018-05-04 上海英佛曼纳米科技股份有限公司 A kind of hot-rolling water circulating pump impeller with high-performance antiscour wear-resistant nano coating resistant to chemical etching

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
姚广春，刘宜汉等编著: "《先进材料制备技术》", 31 December 2006, 东北大学出版社 *
王月 等编著: "《功能材料概论[M]》", 31 December 2017, 冶金工业出版社 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111136217A (en) * 2020-03-05 2020-05-12 无锡市灵通铸造有限公司 Casting process of generator impeller
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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