CN110821837A - Slurry pump - Google Patents

Slurry pump Download PDF

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Publication number
CN110821837A
CN110821837A CN201911272296.1A CN201911272296A CN110821837A CN 110821837 A CN110821837 A CN 110821837A CN 201911272296 A CN201911272296 A CN 201911272296A CN 110821837 A CN110821837 A CN 110821837A
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CN
China
Prior art keywords
coating
slurry pump
ceramic
particle size
ceramic particles
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Pending
Application number
CN201911272296.1A
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Chinese (zh)
Inventor
于法静
任文斌
雷刚
朱绪庆
胡海涛
巩庆涛
杨朝稳
马勇
李冰冰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yantai Longyuan Power Technology Co Ltd
CHN Energy Penglai Power Generation Co Ltd
Original Assignee
Yantai Longyuan Power Technology Co Ltd
CHN Energy Penglai Power Generation Co Ltd
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Application filed by Yantai Longyuan Power Technology Co Ltd, CHN Energy Penglai Power Generation Co Ltd filed Critical Yantai Longyuan Power Technology Co Ltd
Priority to CN201911272296.1A priority Critical patent/CN110821837A/en
Publication of CN110821837A publication Critical patent/CN110821837A/en
Pending legal-status Critical Current

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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
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • 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
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • 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
    • C09D7/65—Additives macromolecular
    • 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
    • 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
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/406—Casings; Connections of working fluid especially adapted for liquid pumps
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/611—Coating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to a slurry pump, wherein the overflowing surfaces of an impeller, a volute, a front guard plate and a rear guard plate in the slurry pump are provided with coatings; the coating comprises an alloy coating and a ceramic coating; the alloy coating is an intermediate coating; the ceramic coating is a top coat. According to the invention, the multi-layer coating material is arranged on the overflowing surface in the slurry pump, so that the slurry pump can be used for a long time, and meanwhile, the corrosion resistance, cavitation corrosion resistance and abrasion resistance of the overflowing part are improved; the ceramic coating serving as the surface coating is further used as a hole sealing agent of the alloy coating to fill micropores in the alloy coating, so that a corrosive medium can be prevented from permeating into the coating, and further, the damage of the corrosive medium to bottom metal and even an overflowing surface is remarkably reduced.

Description

Slurry pump
Technical Field
The invention relates to the field of pump machinery, in particular to a slurry pump.
Background
At present, a wet flue gas desulfurization system is generally adopted by a thermal power generating unit, represented by a limestone-gypsum method, and is characterized in that limestone is prepared into slurry with a certain concentration and stored in a desulfurization tower, the slurry circulates to a spraying layer at the top of the desulfurization tower through a plurality of slurry circulating pumps arranged outside the desulfurization tower, after being atomized, the slurry contacts with flue gas flowing upwards in a counter-current manner in the form of fine liquid drops to neutralize SO in the flue gas2。
The desulfurization slurry circulating pump is a core device in a wet flue gas desulfurization system, and whether the desulfurization slurry circulating pump can safely and stably operate or not directly influences the desulfurization efficiency of the desulfurization system, and whether the flue gas emission meets the environmental protection requirement or not. The pH value of the desulfurization slurry is about 5-6, the desulfurization slurry is acidic, the content of chloride ions is as high as 20000-80000ppm, and the slurry contains a large number of solid particles with the particle size ranging from several micrometers to several hundred micrometers. Due to the characteristics of acid and high chloride ions of the slurry, the circulating pump has serious corrosion on the flow passage component in the long-term operation process; in addition to the high speed rotation of the circulating pump impeller during operation, the slurry fluid is inCavitation-like cavitation destruction occurs on the metal surface in contact with the fluid under conditions of high flow and pressure change. The desulfurization slurry adopted by wet desulfurization is a solid-liquid dual-phase flow medium, the main solid components are gypsum crystals and a small amount of limestone, inert substances, fly ash and the like, and the mass concentration is generally 15-20%. If the CaO content in the limestone for preparing the slurry is lower, SiO2Excessive content of MgO and the like, which causes SiO in slurry of the absorption tower2And the content of insoluble substances is higher, the concentration of the slurry is higher for a long time, and more solid particle impurities are generated, so that the abrasion of the slurry circulating pump is aggravated. In conclusion, the overflowing part of the slurry circulating pump has short service life, and the output of the pump is sharply reduced along with the aggravation of corrosion, cavitation and abrasion, so that the desulfurization efficiency is reduced, and the safety and the environmental protection index of the operation of a power plant are seriously influenced. Therefore, the slurry circulating pump needs to be optimized and modified, and the corrosion resistance, cavitation erosion resistance and abrasion resistance of the flow passage component are improved.
CN202833188A discloses a super wear-resistant and corrosion-resistant composite pump with low cost, high wear resistance, strong corrosion resistance, impact resistance and high temperature resistance, but the process flow of the manufacturing process is more complex, and meanwhile, a welded toughening net is arranged, which is not beneficial to the maintenance of equipment. CN208138186A discloses a silicon carbide desulfurization centrifugal pump which has good corrosion and wear resistance effects, does not need to make a model again, greatly reduces the cost, has better corrosion and wear resistance effects and long service life; but the silicon carbide is integrally manufactured, so that the toughness is poor, and the impact resistance and the cavitation erosion resistance are poor.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a slurry pump, which remarkably improves the corrosion resistance, cavitation erosion resistance, stripping resistance, impact resistance and abrasion resistance of a flow passage component and prolongs the service life of a slurry pump through the synergistic coupling effect of an alloy coating and a ceramic coating on the surface of the flow passage component in the slurry pump.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a slurry pump, wherein the overflowing surfaces of an impeller, a volute, a front guard plate and a rear guard plate in the slurry pump are provided with coatings; the coating comprises an alloy coating and a ceramic coating; the alloy coating is an intermediate coating; the ceramic coating is a top coat.
According to the invention, the multi-layer coating material is arranged on the overflowing surface in the slurry pump, and comprises the alloy coating and the ceramic coating, so that the slurry pump can be used for a long time, the corrosion resistance, cavitation corrosion resistance and abrasion resistance of the overflowing part are improved, the ceramic coating serving as the surface coating is used as a hole sealing agent of the alloy coating to fill micropores in the alloy coating, corrosive media can be prevented from permeating into the coating, and the damage of the corrosive media to bottom metal and even the overflowing surface is obviously reduced.
As a preferable technical scheme of the invention, the alloy coating comprises, by mass, 74.5-84.95% of tungsten carbide, 15-25% of cobalt and 0.05-0.5% of rare earth oxide.
In the present invention, the tungsten carbide content in the alloy coating layer is 74.5 to 84.95% by mass, and may be, for example, 74.5%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 84.95%, or the like, but is not limited to the values listed, and other values not listed in the range are also applicable.
In the present invention, the cobalt content in the alloy coating layer is 15 to 25% by mass, and may be, for example, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, or the like, but is not limited to the values listed, and other values not listed in this range are also applicable.
In the present invention, the content of the rare earth oxide in the alloy coating layer is 0.05 to 0.5% by mass, and may be, for example, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%, but is not limited to the listed values, and other values not listed in this range are also applicable.
The rare earth oxide in the present invention may be cerium oxide, lanthanum oxide, yttrium oxide, or the like, but is not limited to the rare earth oxides listed, and other rare earth oxides that can achieve the same effects and actions may be used.
In a preferred embodiment of the present invention, the tungsten carbide has a particle size of 20 to 44 μm, for example, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, 35 μm, 36 μm, 37 μm, 38 μm, 39 μm, 40 μm, 41 μm, 42 μm, 43 μm or 44 μm, but is not limited to the above-mentioned values, and other values not listed in this range are also applicable.
Preferably, the cobalt has a particle size of 15 to 20 μm, and may be, for example, 15 μm, 15.5 μm, 16 μm, 16.5 μm, 17 μm, 17.5 μm, 18 μm, 18.5 μm, 19 μm, 19.5 μm or 20 μm, but is not limited to the values listed, and other values not listed in this range are equally applicable.
Preferably, the rare earth oxide has a particle size of 10 to 15 μm, and may be, for example, 10 μm, 10.5 μm, 11 μm, 11.5 μm, 12 μm, 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm, or 15 μm, but is not limited to the listed values, and other values not listed in this range are also applicable.
In a preferred embodiment of the present invention, the thickness of the alloy coating is 0.2 to 0.3mm, and may be, for example, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, or 0.3mm, but is not limited to the values listed, and other values not listed in this range are also applicable.
Preferably, the ceramic coating has a thickness of 0.3 to 1mm, and may be, for example, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1mm, etc., but is not limited to the values listed, and other values not listed in this range are equally applicable.
The alloy coating is deposited by surface engineering techniques such as plasma surfacing, spraying or laser melting.
As a preferred technical scheme of the invention, the ceramic coating comprises a modified binder and ceramic particles.
In a preferred embodiment of the present invention, the content of the modified binder in the ceramic coating is 10 to 30%, for example, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, or 30%, but not limited to the above-mentioned values, and other values not listed in the range are also applicable.
In a preferred embodiment of the present invention, the content of the ceramic particles in the ceramic coating is 70 to 90%, for example, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, or 90%, but not limited to the listed values, and other values not listed in the range are also applicable.
As a preferred technical scheme of the invention, the modified binder comprises nano SiO2And (3) modifying the epoxy resin.
As a preferred embodiment of the present invention, the ceramic particles comprise SiC and/or Cr2O3。
In a preferred embodiment of the present invention, the ceramic particles have a particle size of 0.5 to 500. mu.m, for example, 0.5. mu.m, 1. mu.m, 5. mu.m, 10. mu.m, 20. mu.m, 30. mu.m, 40. mu.m, 50. mu.m, 60. mu.m, 70. mu.m, 80. mu.m, 90. mu.m, 100. mu.m, 150. mu.m, 200. mu.m, 250. mu.m, 300. mu.m, 350. mu.m, 400. mu.m, 450. mu.m or 500. mu.m, but not limited thereto, and other values not listed in this range are also applicable.
Preferably, the ceramic particles have a particle size in the range of 0.5 to 5 μm in the range of 0 to 5% by mass, for example, 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%, etc., but not limited to the values listed, and other values not listed in this range are also applicable.
Preferably, the ceramic particles have a particle size in the range of 5 to 30 μm in the range of 0 to 5% by mass, for example, 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%, etc., but not limited to the values listed, and other values not listed in this range are also applicable.
Preferably, the ceramic particles have a particle size in the range of 30 to 500 μm in the range of 90 to 100% by mass, for example 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% by mass, but not limited to the recited values, and other values not recited in this range are also applicable.
In the invention, the nano ceramic coating is deposited by spraying or brushing, and can be carried out for multiple times (at least 3 times) or once, and the thickness of the nano ceramic coating is ensured to be in accordance with 0.3-1 mm. After the coating deposition of the impeller is finished, secondary processing is carried out by using a lathe so as to ensure the dimensional precision and the roundness of the impeller, and a dynamic balance experiment is carried out so as to ensure the weight uniformity of the impeller.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the slurry pump provided by the invention ensures the performances of stripping resistance, impact resistance, wear resistance, corrosion resistance, cavitation resistance and the like of the coating through the synergistic coupling effect of the alloy coating and the ceramic coating.
(2) The overflowing surface in the slurry pump provided by the invention has high-efficiency corrosion resistance, cavitation corrosion resistance and abrasion resistance, and meanwhile, the service life is also obviously prolonged.
Drawings
Fig. 1 is a metallographic image of a flow-coating layer in a slurry pump according to example 1 of the present invention.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a slurry pump, wherein coating layers are arranged on the overflowing surfaces of an impeller, a volute, a front guard plate and a rear guard plate in the slurry pump; the coating comprises an alloy coating as an intermediate coating and a ceramic coating as a top coating;
the alloy coating comprises 81.5% of tungsten carbide, 18% of cobalt and 0.5% of rare earth oxide by mass percent; the granularity of the tungsten carbide is 25 mu m; the particle size of the cobalt is 20 mu m; the particle size of the rare earth oxide is 10 mu m; the thickness of the alloy coating is 0.3 mm; the thickness of the ceramic coating is 0.5 mm.
The ceramic coating comprises a modified binder and ceramic particles; the content of the modified binder in the ceramic coating is 18%; the content of ceramic particles in the ceramic coating is 82%; the modified binder comprises nano SiO2Modified epoxy resin; the ceramic particles comprise SiC; the particle size of the ceramic particles is 0.5-500 μm; the mass percentage content of the ceramic particles with the granularity range of 0.5-5 mu m is 3 percent; the mass percentage content of the ceramic particles with the granularity range of 5-30 mu m is 5%; the mass percentage content of the ceramic particles with the particle size range of 30-500 mu m is 82%.
The slurry pump is subjected to a hardness test (GB/T4340.1-2009), an abrasion resistance test (GB/T23988-.
Example 2
The embodiment provides a slurry pump, wherein coating layers are arranged on the overflowing surfaces of an impeller, a volute, a front guard plate and a rear guard plate in the slurry pump; the coating comprises an alloy coating as an intermediate coating and a ceramic coating as a top coating;
the alloy coating comprises 83.7% of tungsten carbide, 16% of cobalt and 0.3% of rare earth oxide by mass percent; the granularity of the tungsten carbide is 30 mu m; the particle size of the cobalt is 16 mu m; the particle size of the rare earth oxide is 12 mu m; the thickness of the alloy coating is 0.3 mm; the thickness of the ceramic coating is 1 mm.
The ceramic coating comprises a modified binder and ceramic particles; the content of the modified binder in the ceramic coating is 15%; the content of ceramic particles in the ceramic coating is 85%; the modified binder comprises nano SiO2Modified epoxy resin; the ceramic particles comprise SiC; the particle size of the ceramic particles is 0.5-500 μm; the mass percentage content of the ceramic particles with the granularity range of 0.5-5 mu m is 2%; particle size range in the ceramic particlesThe mass percentage content of the enclosure of 5-30 mu m is 8 percent; the mass percentage content of the ceramic particles with the particle size range of 30-500 mu m is 90%.
The slurry pump is subjected to a hardness test (GB/T4340.1-2009), an abrasion resistance test (GB/T23988-.
Example 3
The embodiment provides a slurry pump, wherein coating layers are arranged on the overflowing surfaces of an impeller, a volute, a front guard plate and a rear guard plate in the slurry pump; the coating comprises an alloy coating as an intermediate coating and a ceramic coating as a top coating;
the alloy coating comprises 75.5% of tungsten carbide, 24% of cobalt and 0.5% of rare earth oxide by mass percent; the granularity of the tungsten carbide is 20 mu m; the particle size of the cobalt is 15 mu m; the particle size of the rare earth oxide is 10 mu m; the thickness of the alloy coating is 0.25 mm; the thickness of the ceramic coating is 0.3 mm.
The ceramic coating comprises a modified binder and ceramic particles; the content of the modified binder in the ceramic coating is 20%; the content of ceramic particles in the ceramic coating is 80%; the modified binder comprises nano SiO2Modified epoxy resin; the ceramic particles comprise SiC; the particle size of the ceramic particles is 0.5-500 μm; the mass percentage content of the ceramic particles with the granularity range of 0.5-5 mu m is 4%; the mass percentage content of the ceramic particles with the granularity range of 5-30 mu m is 4%; the mass percentage content of the ceramic particles with the particle size range of 30-500 mu m is 92%.
The slurry pump is subjected to a hardness test (GB/T4340.1-2009), an abrasion resistance test (GB/T23988-.
Example 4
The embodiment provides a slurry pump, wherein coating layers are arranged on the overflowing surfaces of an impeller, a volute, a front guard plate and a rear guard plate in the slurry pump; the coating comprises an alloy coating as an intermediate coating and a ceramic coating as a top coating;
the alloy coating comprises 78.5% of tungsten carbide, 21% of cobalt and 0.5% of rare earth oxide by mass percent; the granularity of the tungsten carbide is 40 mu m; the particle size of the cobalt is 20 mu m; the particle size of the rare earth oxide is 15 mu m; the thickness of the alloy coating is 0.2 mm; the thickness of the ceramic coating is 0.8 mm.
The ceramic coating comprises a modified binder and ceramic particles; the content of the modified binder in the ceramic coating is 25%; the content of ceramic particles in the ceramic coating is 75%; the modified binder comprises nano SiO2Modified epoxy resin; the ceramic particles comprise SiC; the particle size of the ceramic particles is 0.5-500 μm; the mass percentage content of the ceramic particles with the granularity range of 0.5-5 mu m is 2%; the mass percentage content of the ceramic particles with the granularity range of 5-30 mu m is 5%; the mass percentage content of the ceramic particles with the particle size range of 30-500 mu m is 93%.
The slurry pump is subjected to a hardness test (GB/T4340.1-2009), an abrasion resistance test (GB/T23988-.
Comparative example 1
The only difference from example 2 is that the slurry pump in this comparative example is provided with an alloy coating only; the slurry pump is subjected to a hardness test (GB/T4340.1-2009), an abrasion resistance test (GB/T23988-.
Comparative example 2
The only difference from example 2 is that the slurry pump in this comparative example is provided with only a ceramic coating; the slurry pump is subjected to a hardness test (GB/T4340.1-2009), an abrasion resistance test (GB/T23988-.
TABLE 1 test results of Performance in examples and comparative examples
By combining the results of the above embodiments and comparative examples, it can be found that the slurry pump provided by the present invention realizes the long-term use of the slurry pump by the synergistic coupling effect of the alloy coating and the ceramic coating on the surface of the flow passage component in the slurry pump, and simultaneously improves the corrosion resistance, cavitation corrosion resistance and wear resistance of the flow passage component, and meanwhile, the ceramic coating as the top coating is used as the hole sealing agent of the alloy coating to fill the micropores in the alloy coating, so as to prevent corrosive media from permeating into the coating, and significantly reduce the damage of the corrosive media to the bottom metal and even the flow passage surface.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (10)

1. A slurry pump is characterized in that coating layers are arranged on the overflowing surfaces of an impeller, a volute, a front guard plate and a rear guard plate in the slurry pump; the coating comprises an alloy coating and a ceramic coating; the alloy coating is an intermediate coating; the ceramic coating is a top coat.
2. The slurry pump of claim 1 wherein the alloy coating comprises, in mass percent, 74.5-84.95% tungsten carbide, 15-25% cobalt, and 0.05-0.5% rare earth oxide.
3. The slurry pump according to claim 2, wherein the tungsten carbide has a particle size of 20-44 μm;
preferably, the cobalt has a particle size of 15-20 μm;
preferably, the particle size of the rare earth oxide is 10-15 μm.
4. The slurry pump according to any of claims 1 to 3, characterized in that the thickness of the alloy coating is 0.2 to 0.3mm,
preferably, the thickness of the ceramic coating is 0.3-1 mm.
5. The slurry pump according to any of claims 1 to 4, wherein the ceramic coating comprises a modified binder and ceramic particles.
6. The slurry pump according to claim 5, wherein the modified binder content of the ceramic coating is 10-30%.
7. The slurry pump according to claim 5 or 6, characterized in that the ceramic coating has a ceramic particle content of 70-90%.
8. The method as claimed in any one of claims 5 to 7The slurry pump is characterized in that the modified binder comprises nano SiO2And (3) modifying the epoxy resin.
9. The slurry pump according to any of claims 5 to 8, characterized in that the ceramic particles comprise SiC and/or Cr2O3。
10. The slurry pump according to any of claims 5 to 9, characterized in that the ceramic particles have a particle size of 0.5 to 500 μm;
preferably, the mass percentage content of the ceramic particles with the particle size range of 0.5-5 μm is 0-5%;
preferably, the mass percentage content of the ceramic particles with the particle size range of 5-30 μm is 0-5%;
preferably, the mass percentage content of the ceramic particles with the particle size range of 30-500 mu m is 90-100%.
CN201911272296.1A 2019-12-12 2019-12-12 Slurry pump Pending CN110821837A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113999593A (en) * 2021-10-21 2022-02-01 山东鑫海矿业技术装备股份有限公司 Coating for impeller of vortex crushing device and preparation process thereof

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CN101481800A (en) * 2008-01-08 2009-07-15 通用电气公司 Erosion and corrosion-resistant coating system and process therefor
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