CN115594525A - Wear-resistant sheet of centrifugal machine and preparation process thereof - Google Patents
Wear-resistant sheet of centrifugal machine and preparation process thereof Download PDFInfo
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- CN115594525A CN115594525A CN202211307069.XA CN202211307069A CN115594525A CN 115594525 A CN115594525 A CN 115594525A CN 202211307069 A CN202211307069 A CN 202211307069A CN 115594525 A CN115594525 A CN 115594525A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5093—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with elements other than metals or carbon
- C04B41/5096—Silicon
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Centrifugal Separators (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention belongs to the technical field of wear-resistant materials, and particularly relates to a centrifuge wear-resistant sheet and a preparation process thereof, wherein the composite wear-resistant sheet prepared by a special preparation process has the characteristics of high toughness, high hardness and low friction coefficient, and can greatly improve the wear resistance of a helical blade, so that the service life of the helical blade is prolonged; meanwhile, the maintenance frequency is reduced, and the working efficiency is well improved; the density of the composite wear-resistant plate is far lower than that of the hard alloy wear-resistant plate, so that the weight of the wear-resistant plate is greatly reduced, and the energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of wear-resistant materials, in particular to a wear-resistant sheet of a centrifugal machine and a preparation process thereof.
Background
The blade of the screw conveyor of the horizontal screw centrifuge, especially the conical end part, is easily worn and corroded by materials when the materials are processed, when the blade is seriously damaged, the gap between the blade and the rotary drum is enlarged, so that the extrusion of the materials is influenced, the water content of discharged dry slag is higher, and the discharge efficiency and quality of the dry slag are influenced. At present, hard alloy wear-resistant pieces are mainly welded at the easy-to-wear parts of the helical blades in the industry, so that the wear of the helical blades is reduced. However, the hard alloy still wears relatively fast in the practical application process, and has heavier weight and higher energy consumption.
Disclosure of Invention
In order to solve the problems in the prior art, the invention mainly aims to provide a wear-resistant plate of a centrifuge and a preparation process thereof.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
a preparation process of a wear-resistant sheet of a centrifuge comprises the following steps:
s1, preparing Si-MoS 2 Mixed powder
Si powder and MoS with the weight ratio of 1 (0.01-0.03) 2 Mixing the powders to obtain mixed powder;
s2, siliconizing treatment
Placing Si-MoS in a crucible 2 Mixing the powder, placing the C/C composite material with the aperture ratio of 26-34% and the carbon content of 45-60wt% on the mixed powder, and then placing the crucible into a siliconizing furnace for processing to obtain the wear-resistant sheet.
The preferable scheme of the preparation process of the wear-resistant sheet of the centrifuge is as follows: the step S1 specifically includes:
s11, adding 40-50 wt% of Si powder and adding the used amount of MoS 2 Powder, finally adding the rest Si powder, and mixing the materials for 1-3 hours by using a ball mill without adding balls after all the Si powder is added, so as to ensure that the element powder is uniformly mixed;
s12, using a ball mill to mill Si-MoS 2 Ball milling the mixed powder according to the ball-to-material ratio of (6-9) to 1 for 6-8h, taking out, sieving, drying and storing.
The preferable scheme of the preparation process of the wear-resistant sheet of the centrifuge is as follows: in the step S12, the ball milling medium is YG8, and includes three media of Φ 4mm, Φ 7mm, and Φ 12mm, and the weight ratio is 1.
As a preferable scheme of the preparation process of the centrifuge wear-resistant sheet, the preparation process comprises the following steps: in the step S11, the ball milling horizontal rotating speed is 400-500r/min, and the overturning rotating speed is 0.5-1.0r/min.
As a preferable scheme of the preparation process of the centrifuge wear-resistant sheet, the preparation process comprises the following steps: in the step S12, the ball milling horizontal rotating speed is 300-500r/min, and the overturning rotating speed is 0.5-1.0r/min.
As a preferable scheme of the preparation process of the centrifuge wear-resistant sheet, the preparation process comprises the following steps: in the step S1, the granularity of the Si powder is 200 meshes, and the purity is more than 99.99%; the MoS 2 The granularity of the powder is 3000 meshes, and the purity is more than 99.99 percent.
The preferable scheme of the preparation process of the wear-resistant sheet of the centrifuge is as follows: in the step S2, the crucible is placed into a siliconizing furnace for treatment, and the process comprises the following steps: vacuumizing to below 200pa, heating for 120-150min, heating to 1600 +/-30 deg.C, and holding for 15-30min.
As a preferable scheme of the preparation process of the centrifuge wear-resistant sheet, the preparation process comprises the following steps: in the step S2, the Si-MoS 2 The amount of the mixed powder used is 2 to 3 times the weight of the abrasion-resistant sheet to be produced.
In order to solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solutions:
the wear-resistant sheet of the centrifuge is prepared by adopting the preparation process.
As a preferable aspect of the centrifuge wear pad of the present invention, wherein: the wear rate of the wear-resistant sheet is less than or equal to 0.0025mm/km.
The invention has the following beneficial effects:
the invention provides a centrifuge wear-resistant sheet and a preparation process thereof, the composite wear-resistant sheet prepared by the special preparation process has the characteristics of high toughness, high hardness and low friction coefficient, and can greatly improve the wear resistance of helical blades, thereby prolonging the service life of the helical blades; meanwhile, the maintenance frequency is reduced, and the working efficiency is well improved; the density of the composite wear-resistant plate is far lower than that of the hard alloy wear-resistant plate, so that the weight of the wear-resistant plate is greatly reduced, and the energy consumption is reduced.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments, and obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a centrifuge wear-resistant sheet and a preparation process thereof, the composite wear-resistant sheet prepared by a special preparation process has the characteristics of high toughness, high hardness and low friction coefficient, the wear-resistant sheet is a carbon fiber reinforced silicon carbide-based composite material, wherein carbon fibers in the wear-resistant sheet are distributed in three spatial directions of XYZ, and simultaneously, silicon carbide and MoS are filled in the middle of the carbon fibers 2 The matrix and the carbon fiber well provide the strength required by the wear-resistant plate, silicon carbide and MoS 2 The matrix provides the hardness required by the wear-resistant plate, and the wear-resistant plate has high strength, high hardness and low density by combining the matrix, so that the wear resistance of the helical blade can be greatly improved, and the service life of the helical blade is prolonged; meanwhile, the maintenance frequency is reduced, and the working efficiency is well improved; the density of the composite wear-resistant plate is far lower than that of the hard alloy wear-resistant plate, so that the weight of the wear-resistant plate is greatly reduced, and the energy consumption is reduced.
According to one aspect of the invention, the invention provides the following technical scheme:
a preparation process of a wear-resistant sheet of a centrifuge comprises the following steps:
s1, preparing Si-MoS 2 Mixed powder
Si powder and MoS with the weight ratio of 1 (0.01-0.03) 2 Mixing the powders to obtain a mixed powder; mixing may be carried out using a compounder, such as a V-compounder; the granularity of the Si powder is 200 meshes, and the purity is more than 99.99 percent; the MoS 2 The granularity of the powder is 3000 meshes, and the purity is more than 99.99 percent; during mixing, firstly adding 40-50 wt% of Si powder and then adding the amount of MoS 2 Powder, finally adding the rest Si powder, mixing the mixture for 1-3h by using a ball mill without adding balls after all the Si powder is added, wherein the horizontal rotating speed of the ball mill is 400-500r/min, and the overturning rotating speed is 0.5-1.0r/min, so that the element powder is uniformly mixed; the mixing mode enables MoS 2 The powder is placed in Si powder to prevent MoS 2 The powder sticks toThe wall of the mixing barrel is uneven in mixing; si-MoS is treated by a ball mill 2 Ball-milling the mixed powder for 6-8h according to the ball-to-material ratio of (6-9) to 1, taking out, sieving, drying and storing; the ball milling medium is YG8, comprising three mediums of phi 4mm, phi 7mm and phi 12mm, the weight ratio is 1; the screen mesh is 100 meshes.
Specifically, the Si powder and MoS 2 The weight ratio of the powders may be, for example, but not limited to, any one of 1.01, 1, 0.015, 1; the ball-to-feed ratio may be, for example, but is not limited to, 6.
S2, siliconizing treatment
Placing Si-MoS in a crucible 2 Mixing the powder, wherein the crucible can be a graphite crucible; placing the C/C composite material with the aperture ratio of 26-34% and the carbon content of 45-60wt% on the mixed powder, and then placing the crucible into a siliconizing furnace for treatment to obtain a wear-resistant sheet; the treatment process of putting the crucible into the siliconizing furnace comprises the following steps: vacuumizing to below 200pa, heating for 120-150min, heating to 1600 +/-30 ℃ for melt infiltration, and keeping the temperature for 15-30min; the Si-MoS 2 The amount of the mixed powder used is 2 to 3 times the weight of the abrasion-resistant sheet to be produced.
Specifically, the open porosity of the C/C composite material may be, for example, but not limited to, any one of 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, or a range between any two; the carbon content of the C/C composite may be, for example, but not limited to, any one of 45wt%, 50wt%, 55wt%, 60wt%, or a range between any two; the temperature rise time may be, for example, but is not limited to, any one of 120min, 130min, 140min, 150min or a range between any two; the incubation time may be, for example, without limitation, any one of 15min, 20min, 25min, 30min or a range between any two; the Si-MoS 2 The amount of the mixed powder used may be, for example, but not limited to, 2 times the weight of the abrasion-resistant sheet to be produced 2.1 times, 2.2 times, 2.3 times, 2.4 times, 2.5 times, 2.6 times, 2.7 times, 2.8 times, 2.9 times,Any one of 3 times or a range between any two.
The invention also provides a wear-resistant sheet of the centrifuge, which is prepared by adopting the preparation process; the wear rate of the wear-resistant sheet is less than or equal to 0.0025mm/km.
The technical solution of the present invention is further illustrated by the following specific examples.
Example 1
A preparation process of a wear-resistant sheet of a centrifuge comprises the following steps:
s1, preparing Si-MoS 2 Mixed powder
Mixing Si powder and MoS in a weight ratio of 1 2 Putting the powder into a V-shaped batch mixer to be mixed to obtain mixed powder; during mixing, 40wt% of Si powder is added, and then the amount of MoS is added 2 Powder, and finally adding the rest Si powder, and mixing the mixture for 2 hours by using a ball mill without adding balls after all the Si powder is added, wherein the horizontal rotating speed of the ball mill is 400r/min, and the overturning rotating speed is 0.5r/min, so that the element powder is uniformly mixed; si-MoS is treated by a ball mill 2 Ball-milling the mixed powder for 6 hours according to the ball-material ratio of 6; the ball milling medium is YG8, comprising three media of phi 4mm, phi 7mm and phi 12mm, the weight ratio is 1; taking a 100-mesh screen out of the screens;
s2, siliconizing treatment
Placing Si-MoS in a crucible 2 Mixed powder of said Si-MoS 2 The amount of the mixed powder used is 2 times the weight of the abrasion-resistant sheet to be produced; and (2) placing the C/C composite material with the aperture ratio of 26% and the carbon content of 45wt% on the mixed powder, then placing the crucible into a siliconizing furnace, vacuumizing to below 200pa, heating for 120min, heating to 1580 ℃ for melt infiltration, keeping the temperature for 15min, and processing to obtain the wear-resistant sheet A.
Example 2
A preparation process of a wear-resistant sheet of a centrifuge comprises the following steps:
s1, preparing Si-MoS 2 Mixed powder
Mixing Si powder and MoS in a weight ratio of 1 2 Mixing the powders in a V-shaped mixer to obtain a mixtureA powder; during mixing, 45wt% of Si powder is added, and then the used amount of MoS is added 2 Powder, and finally adding the rest Si powder, mixing the materials for 2 hours by using a ball mill without adding balls after all the Si powder is added, wherein the horizontal rotation speed of the ball mill is 450r/min, and the overturning rotation speed is 0.75r/min, so that the element powder is uniformly mixed; si-MoS is treated by a ball mill 2 Ball-milling the mixed powder for 7 hours according to the ball-material ratio of 6; the ball milling medium is YG8, comprising three media of phi 4mm, phi 7mm and phi 12mm, the weight ratio is 1; taking a 100-mesh screen out of the screens;
s2, siliconizing treatment
Placing Si-MoS in a crucible 2 Mixed powder of said Si-MoS 2 The amount of the mixed powder used was 2.5 times the weight of the abrasion-resistant sheet to be produced; and (3) placing the C/C composite material with the aperture ratio of 29% and the carbon content of 52wt% on the mixed powder, then placing the crucible into a siliconizing furnace, vacuumizing to below 200pa, heating for 135min, heating to 1610 ℃ for melt infiltration, and keeping the temperature for 22min to obtain the wear-resistant sheet B.
Example 3
A preparation process of a wear-resistant sheet of a centrifuge comprises the following steps:
s1, preparing Si-MoS 2 Mixed powder
Mixing Si powder and MoS in a weight ratio of 1 2 Mixing the powder in a V-shaped batch mixing machine to obtain mixed powder; when mixing, firstly adding 50wt% of Si powder, and then adding the used amount of MoS 2 Powder, and finally adding the rest Si powder, and mixing the mixture for 2 hours by using a ball mill without adding balls after all the Si powder is added, wherein the horizontal rotating speed of the ball mill is 500r/min, and the overturning rotating speed is 1.0r/min, so that the element powder is uniformly mixed; si-MoS is treated by a ball mill 2 Ball-milling the mixed powder for 8 hours according to the ball-material ratio of 6; the ball milling medium is YG8, comprising three mediums of phi 4mm, phi 7mm and phi 12mm, the weight ratio is 1; taking a 100-mesh screen out of the screens;
s2, siliconizing treatment
Placing Si-MoS in a crucible 2 The powders are mixed and then mixed to obtain a mixture,the Si-MoS 2 The amount of the mixed powder used is 2 times the weight of the abrasion-resistant sheet to be produced; and (3) placing the C/C composite material with the aperture ratio of 34% and the carbon content of 60wt% on the mixed powder, then placing the crucible into a siliconizing furnace, vacuumizing to below 200pa, heating for 150min, heating to 1630 ℃ for melt infiltration, and keeping the temperature for 30min to obtain the wear-resistant sheet C.
Comparative example 1
The difference from example 1 is that no MoS was added to the mixed powder 2 And (5) grinding to obtain the wear-resistant sheet D.
Comparative example 2
The difference from example 1 is that the Si powder and MoS in the mixed powder 2 The specific weight ratio of the powder was 1, and abrasion-resistant sheet E was prepared.
The abrasion resistant sheets of each example and comparative example were tested and the results are shown in the following table:
| sample(s) | Rate of wear |
| Wear-resisting piece A | 0.0014mm/km |
| Wear-resisting piece B | 0.0021mm/km |
| Wear-resisting piece C | 0.0017mm/km |
| Wear-resisting piece D | 0.027mm/km |
| Wear-resistant sheet E | 0.15mm/km |
Therefore, the composite wear-resistant sheet prepared by the special preparation process has the characteristics of high toughness, high hardness and low friction coefficient, and the wear rate of the wear-resistant sheet is less than or equal to 0.0025mm/km; the wear-resistant sheet is a carbon fiber reinforced silicon carbide-based composite material, wherein carbon fibers in the wear-resistant sheet are distributed in three XYZ spatial directions, and silicon carbide and MoS are filled in the middle of the carbon fibers 2 The matrix and the carbon fiber well provide the strength required by the wear-resistant sheet, silicon carbide and MoS 2 The matrix provides the hardness required by the wear-resistant plate, and the wear-resistant plate has high strength, high hardness and low density by combining the matrix, so that the wear resistance of the helical blade can be greatly improved, and the service life of the helical blade is prolonged; meanwhile, the maintenance frequency is reduced, and the working efficiency is well improved; the density of the composite wear-resistant plate is far lower than that of the hard alloy wear-resistant plate, so that the weight of the wear-resistant plate is greatly reduced, and the energy consumption is reduced.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The preparation process of the wear-resistant sheet of the centrifuge is characterized by comprising the following steps of:
s1, preparing Si-MoS 2 Mixed powder
Si powder and MoS with the weight ratio of 1 (0.01-0.03) 2 Mixing the powders to obtain mixed powder;
s2, siliconizing treatment
Placing Si-MoS in a crucible 2 Mixing the powder, placing the C/C composite material with the aperture ratio of 26-34% and the carbon content of 45-60wt% on the mixed powder, and then placing the crucible into a siliconizing furnace for processing to obtain the wear-resistant sheet.
2. The preparation process according to claim 1, wherein the step S1 specifically comprises:
s11, adding 40-50 wt% of Si powder and adding the used amount of MoS 2 Powder, finally adding the rest Si powder, and mixing the materials for 1-3 hours by using a ball mill without adding balls after all the Si powder is added, so as to ensure that the element powder is uniformly mixed;
s12, using a ball mill to mix Si-MoS 2 Ball-milling the mixed powder according to the ball-material ratio of (6-9) to 1 for 6-8h, taking out, sieving, drying and storing.
3. The preparation process according to claim 2, wherein in step S12, the ball milling medium is YG8, and comprises three media of Φ 4mm, Φ 7mm, and Φ 12mm, in a weight ratio of 1.
4. The preparation process according to claim 2, wherein in the step S11, the ball milling horizontal rotation speed is 400 to 500r/min, and the overturning rotation speed is 0.5 to 1.0r/min.
5. The preparation process according to claim 2, wherein in the step S12, the ball milling horizontal rotation speed is 300 to 500r/min, and the overturning rotation speed is 0.5 to 1.0r/min.
6. The preparation process according to claim 1, wherein in the step S1, the Si powder has a particle size of 200 meshes and a purity of > 99.99%; the MoS 2 The granularity of the powder is 3000 meshes, and the purity is more than 99.99 percent.
7. The preparation process according to claim 1, wherein in the step S2, the crucible is placed in a siliconizing furnace for treatment, and the process comprises the following steps: vacuumizing to below 200pa, heating for 120-150min, heating to 1600 +/-30 deg.C, and holding for 15-30min.
8. The process according to claim 1, wherein in step S2, the Si-MoS is used 2 The mixed powder is used in an amount to prepare2-3 times the weight of the abrasion resistant sheet.
9. A centrifuge wearpad prepared by the process of any one of claims 1-8.
10. The centrifuge wearpad of claim 9, wherein the wear rate of the wearpad is less than or equal to 0.0025mm/km.
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| CN115594525B (en) | 2023-08-18 |
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