CN113416898A - Grinding steel ball capable of improving magnetic property of strontium ferrite and method - Google Patents
Grinding steel ball capable of improving magnetic property of strontium ferrite and method Download PDFInfo
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- CN113416898A CN113416898A CN202110681670.4A CN202110681670A CN113416898A CN 113416898 A CN113416898 A CN 113416898A CN 202110681670 A CN202110681670 A CN 202110681670A CN 113416898 A CN113416898 A CN 113416898A
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- strontium ferrite
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- 238000000227 grinding Methods 0.000 title claims abstract description 103
- 229910052712 strontium Inorganic materials 0.000 title claims abstract description 91
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 91
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 81
- 239000010959 steel Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 claims description 66
- 239000002002 slurry Substances 0.000 claims description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 229910001868 water Inorganic materials 0.000 claims description 47
- 238000002156 mixing Methods 0.000 claims description 38
- 238000005266 casting Methods 0.000 claims description 35
- 238000005498 polishing Methods 0.000 claims description 34
- 238000001816 cooling Methods 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 31
- 239000000498 cooling water Substances 0.000 claims description 28
- 239000002994 raw material Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 20
- 238000005245 sintering Methods 0.000 claims description 20
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 8
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 8
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 4
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 6
- 239000000696 magnetic material Substances 0.000 abstract description 5
- 229910052684 Cerium Inorganic materials 0.000 abstract description 4
- 229910052787 antimony Inorganic materials 0.000 abstract description 4
- 229910052746 lanthanum Inorganic materials 0.000 abstract description 4
- 229910052758 niobium Inorganic materials 0.000 abstract description 4
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 13
- 239000013078 crystal Substances 0.000 description 13
- 239000000243 solution Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 9
- 230000004907 flux Effects 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/20—Disintegrating members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/04—Heavy metals
- C23F3/06—Heavy metals with acidic solutions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0286—Trimming
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The application relates to the technical field of magnetic material processing, in particular to a grinding steel ball and a method capable of improving the magnetic property of strontium ferrite. A grinding steel ball capable of improving the magnetic property of strontium ferrite comprises the following components in percentage by weight: 2.5-3.5wt.% Mn; 1.8-2.3 wt.%; 11.0-16.0wt.% Cr; 0.02-0.07wt.% O; si 1.5-2.0 wt.%; ni: 0.3-1.6 wt.%; cu: 0.7-1.1 wt.%; 0.11-0.18wt.% Sb; 0.08-0.12wt.% Nb; 0.42-0.50wt.% Ce; 0.42-0.50wt.% La; the balance being Fe. The grinding steel ball can be applied to a method for improving the magnetic property of strontium ferrite, and has the advantage of improving the magnetic property of strontium ferrite.
Description
Technical Field
The application relates to the technical field of magnetic material processing, in particular to a grinding steel ball and a method capable of improving the magnetic property of strontium ferrite.
Background
Permanent magnetic materials, also known as "hard magnetic materials", i.e. materials that can maintain constant magnetism once magnetized, are widely used in various fields, wherein strontium ferrite in ferrite permanent magnetic materials is taken as an example, and has the advantages of simple structure, convenient use, high temperature resistance, high residual magnetism and magnetic energy product, and the raw materials are cheap and the production cost is low. And with the wide application of automobile motors, household appliances, variable frequency motors, sensors and generators, the demand of the motors is increased year by year, so that the motors are produced in large scale, and the production and preparation process is very important.
The preparation process of the strontium ferrite in the related technology mostly adopts a wet-pressing forming process, and the wet-pressing forming process has the advantages that particles are easier to rotate, the orientation degree is high, the automation is convenient, and the magnetic characteristic result is higher than that of dry-pressing forming. The preparation of the wet-pressing molded slurry is realized through a ball milling process, and the magnetic properties of the slurry are greatly related to those of the pre-sintering material, the additive and the ball milling process. The steel balls used for grinding the slurry in the technology are alloy steel balls with the diameters phi of 6.3, 6.5, 8 and the like, the alloy balls have the advantage of wear resistance, for example, the alloy steel balls with the diameter phi of 6.3 can be used for 6-7 years generally, and the steel balls are replaced after becoming too small.
However, in the above technology, the alloy ball has large surface roughness, and the grain distribution and magnetic properties of the grinding slurry added into the new steel ball in 1-3 years are not good, so that only the slurry with middle and low grade performance can be prepared, and the grain distribution and magnetic properties of the grinding slurry are improved in 4-6 years, which is not ideal for preparing the slurry with high grade performance.
Disclosure of Invention
In order to improve the magnetic properties of the strontium ferrite and slurry in the preparation process, the application provides a grinding steel ball and a method capable of improving the magnetic properties of the strontium ferrite.
In a first aspect, the present application provides a grinding steel ball capable of improving the magnetic property of strontium ferrite, which adopts the following technical scheme:
a grinding steel ball capable of improving the magnetic property of strontium ferrite comprises the following components in percentage by weight:
Mn:2.5-3.5wt.％；
C:1.8-2.3wt.％；
Cr:11.0-16.0wt.％；
O:0.02-0.07wt.％；
Si:1.5-2.0wt.％；
Ni：0.3-1.6wt.％；
Cu：0.7-1.1wt.％；
Sb:0.11-0.18wt.％；
Nb:0.08-0.12wt.％；
Ce:0.42-0.50wt.％；
La:0.42-0.50wt.％；
the balance being Fe;
the diameter of the grinding steel ball is 4.5-5.0 mm.
By adopting the technical scheme, the grinding steel ball has higher Cr content and can form stable martensite by matching with proper Mn, C, O, Si, Ni and Cu, so that the hardness and the surface smoothness of the grinding steel ball are improved, and the hardness of the grinding steel ball can be obviously improved after the Sb and the Nb in the proportion are added into the alloy, the reason is probably that the Sb and the Nb are mutually cooperated to form crystal grains of a trigonal-like system and promote the generation of a small amount of austenite in the preparation process, and then the crystal grains and the La are mutually crosslinked to form a coating layered structure, the addition of the Ce and the La in the proportion plays a role in refining the crystal grains and improving the distribution of the crystal grains, so that the coating structure of the grinding steel ball is more compact and complicated, the reason is that the Ce and the La form a large amount of heterogeneous nucleation in the preparation process, the improvement and the uniform distribution of the shape of the crystal grains are realized by changing the nucleation position and inhibiting the nucleation speed, therefore, the addition of the components improves the toughness and hardness of the grinding steel ball, and is beneficial to improving the magnetic property of products when being applied to the preparation of slurry and strontium ferrite.
Preferably, the composition comprises the following components in percentage by weight:
Mn:2.8-3.2wt.％；
C:1.9-2.1wt.％；
Cr:12.0-15.0wt.％；
O:0.025-0.035wt.％；
Si:1.7-1.8wt.％；
Ni：0.8-1.2wt.％；
Cu：0.8-1.0wt.％；
Sb:0.14-0.18wt.％；
Nb:0.09-0.11wt.％；
Ce:0.45-0.48wt.％；
La:0.45-0.48wt.％；
the balance being Fe;
the diameter of the grinding steel ball is 4.8 mm.
By adopting the technical scheme, the grinding steel ball which has better performance and is formed by crosslinking and coating martensite, trigonal-like crystal grains and a small amount of austenite is obtained by optimizing the distribution ratio of the components, the coating layered structure which is crosslinked mutually can obviously improve the hardness of the grinding steel ball, and is favorable for obtaining slurry and strontium ferrite with better magnetic characteristics.
In a second aspect, the present application provides a method for preparing a grinding steel ball capable of improving the magnetic properties of strontium ferrite, which adopts the following technical scheme:
a preparation method of a grinding steel ball capable of improving the magnetic property of strontium ferrite comprises the following preparation steps:
a. smelting: smelting the components at 1900-2250 ℃ according to the corresponding proportion to prepare a casting liquid;
b. casting: pouring the casting liquid into the mold, wherein the pouring temperature of the casting liquid is 1900-2250 ℃ to prepare a casting;
c. and (3) cooling: slowly cooling the casting by adopting a multi-section water cooling mode, and cooling to room temperature to obtain a ball blank; d. grinding and polishing: and (3) physically polishing an oxide layer and a raised part on the surface of the ball blank by a sand grinding method, then placing the ball blank in polishing solution for secondary polishing, and obtaining the grinding steel ball after polishing.
By adopting the technical scheme, the grinding steel ball prepared by the process steps and conditions is subjected to sectional cooling and multiple polishing treatment, so that the performance is optimal, the hardness is high, the surface is smooth, slurry and strontium ferrite with high magnetic characteristics can be obtained, the preparation method is simple, and various conditions are easy to achieve, therefore, the method is suitable for large-scale batch production, and the grinding steel ball with stable and uniform performance is obtained.
Preferably, the multi-stage water cooling in step c comprises the following specific steps: and (3) adopting any one of a spraying method and a soaking method to enable cooling water to be in contact with the mold, stopping introducing the cooling water for 5-10min when the temperature of the casting is reduced to 1000-1200 ℃, then introducing the cooling water again, stopping introducing the cooling water when the temperature of the casting is reduced to 80-100 ℃, and naturally cooling to room temperature to obtain the ball blank.
By adopting the technical scheme, the multi-section water cooling mode is selected, so that the influence on the plasticity of the casting due to too fast change or too large change amplitude of thermal stress is reduced, the surface precision and hardness of the casting are ensured while the molding quality of the casting is high, and the improvement of the magnetic properties of the prepared strontium ferrite and slurry is facilitated.
Preferably, the polishing solution in the step d is prepared from water, phosphoric acid and nickel sulfate in a weight ratio of 1: (0.3-0.5): (0.05-0.10).
By adopting the technical scheme, the polishing solution aqueous solution formed by mixing the phosphoric acid and the nickel sulfate according to the proportion has a good polishing effect, and the surface smoothness of the grinding steel ball is obviously improved while oxides and protrusions on the surface of the ball blank can be quickly removed by the cooperation of the phosphate radical and the nickel ions.
In a third aspect, the present application provides a method capable of improving the magnetic properties of strontium ferrite, which adopts the following technical scheme: a method for improving the magnetic property of strontium ferrite comprises the following specific preparation steps:
(1) mixing raw materials: uniformly mixing all components in the raw materials according to a corresponding proportion by a wet method to prepare a mixture;
the raw materials comprise the following components in percentage by weight:
SrO 4.7-5.7wt.％；
Ca 1.5-2.8wt.％；
Si 0.1-0.13wt.％；
La2O3 7.0-8.2wt.％；
CaCO3 0.7-1.2wt.％；
Ba 0.05-0.1wt.％；
the balance being Fe2O3Composition is carried out;
(2) pre-burning: pre-burning the mixture in air at 1100-;
(3) crushing: mixing the pre-sintered material, water and the grinding steel ball according to the weight ratio of 1: (1.5-2.0): (8-10) mixing, and grinding at a rotating speed of 20-25r/min for 13-15h to obtain slurry;
(4) molding: drying the slurry, and forming under the action of a magnetic field when the water content of the slurry is controlled to be 30-45%, wherein the magnetizing field during forming is over 12000Oe, so as to obtain a formed body;
(5) and (3) sintering: sintering the formed body at the temperature of 300-500 ℃ for 2-4h, removing water and organic matters in the formed body, then preserving the heat at the temperature of 1100-1300 ℃ for 2-4h in the air, and then grinding, cleaning and detecting to obtain the strontium ferrite.
By adopting the technical scheme, the slurry prepared by the process has good performance, and in the preparation process, the single-domain crystal grains in the slurry can rotate freely and have good orientation, so that the single-domain crystal grains are high in arrangement consistency along the direction from the magnetization axis to the external magnetic field, and the prepared strontium ferrite has the strongest magnetic property.
Preferably, the fine grinding particle size of the slurry is controlled between 0.8 and 0.85 μm, and the concentration of the slurry is controlled between 62 and 68 percent.
By adopting the technical scheme, the slurry with the fine grinding granularity and concentration has the advantages that the single-domain crystal grains in the slurry have the best orientation, the single-domain crystal grains can freely rotate along the direction from the magnetization axis to the external magnetic field, the arrangement consistency is high, and the prepared strontium ferrite has strong magnetic properties.
Preferably, the raw materials consist of the following components in percentage by weight:
SrO 5.0-5.4wt.％；
Ca 1.8-2.5wt.％；
Si 0.11-0.12wt.％；
La2O3 7.4-7.8wt.％；
CaCO3 0.9-1.0wt.％；
Ba 0.06-0.08wt.％；
the balance being Fe2O3And (4) forming.
By adopting the technical scheme, the pre-sintering material prepared by the proportion has the advantages that when the slurry is prepared, the performance of the slurry is optimal, single-domain crystal grains in the slurry can freely rotate along the direction from the magnetization axis to the external magnetic field and are arranged to form a neat crystal grain grid, and the magnetic property of the prepared strontium ferrite is improved.
In summary, the present application has the following beneficial effects:
1. the grinding steel ball adopted by the application has high Cr content, and when a proper amount of Sb, Nb, Ce, La and other elements are added, a small amount of composite layered coating structure of austenite, trigonal-like crystal grains and strip martensite can be formed, so that the toughness and hardness of the grinding steel ball are improved, and when the grinding steel ball is applied to preparation of slurry and strontium ferrite, the magnetic properties of products are improved;
2. the preparation method of the grinding steel balls is simple and easy, and various conditions are easy to achieve, so that large batches of grinding steel balls with balanced performance can be easily obtained, the surface smoothness of the grinding steel balls is greatly improved after the grinding steel balls are subjected to segmented cooling and multiple polishing treatments, and the preparation method is favorable for improving the magnetic properties of products when being applied to preparation of slurry and strontium ferrite;
3. the method is easy to operate, various parameter conditions are easy to control, and meanwhile, the product performance is stable, the magnetic properties are good, and the requirements of actual production are met, so that the method is suitable for large-scale industrial production.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example
Preparation example 1
The grinding steel ball capable of improving the magnetic property of the strontium ferrite comprises the following components and the corresponding weight shown in table 1, and is prepared by the following steps:
a. smelting: smelting the components at 1900-2250 ℃ according to the corresponding proportion to prepare a casting liquid;
b. casting: pouring the casting liquid into the mold, wherein the pouring temperature of the casting liquid is 1900-2250 ℃ to prepare a casting;
c. and (3) cooling: slowly cooling the casting by adopting a multi-section water cooling mode, and cooling to room temperature to obtain a ball blank;
the multi-section water cooling comprises the following specific steps: and (3) enabling cooling water to be in contact with the die by adopting a spraying method, stopping introducing the cooling water for 2.5min when the temperature of the casting is reduced to 800 ℃, then introducing the cooling water again, stopping introducing the cooling water when the temperature of the casting is reduced to 60 ℃, and naturally cooling to room temperature to obtain the ball blank.
d. Grinding and polishing: physically polishing an oxide layer and a raised part on the surface of the ball blank by a sand grinding method, then soaking the ball blank in polishing solution at 60 ℃ for 30min for secondary polishing, and obtaining a grinding steel ball after polishing is finished, wherein the diameter of the grinding steel ball is 4.8 mm;
the polishing liquid was purchased from surface treatment agent, Inc. of Jining Ningpo.
Preparation examples 2 to 6
A grinding steel ball capable of improving the magnetic property of strontium ferrite is different from the steel ball prepared in preparation example 1 in that the components and the corresponding weights thereof are shown in Table 1.
TABLE 1 Components and weights (kg) thereof in preparation examples 1-6
Preparation example 7
The difference between the grinding steel ball capable of improving the magnetic property of the strontium ferrite and the preparation example 3 is that the specific steps of the multi-stage water cooling in the step c are as follows: and (3) enabling cooling water to be in contact with the die by adopting a spraying method, stopping introducing the cooling water for 5min when the temperature of the casting is reduced to 1000 ℃, then introducing the cooling water again, stopping introducing the cooling water when the temperature of the casting is reduced to 80 ℃, and naturally cooling to room temperature to obtain the ball blank.
Preparation example 8
The difference between the grinding steel ball capable of improving the magnetic property of the strontium ferrite and the preparation example 3 is that the specific steps of the multi-stage water cooling in the step c are as follows: and (3) enabling cooling water to be in contact with the mold by adopting a spraying method, stopping introducing the cooling water for 7.5min when the temperature of the casting is reduced to 1100 ℃, then introducing the cooling water again, stopping introducing the cooling water when the temperature of the casting is reduced to 90 ℃, and naturally cooling to room temperature to obtain the ball blank.
Preparation example 9
The difference between the grinding steel ball capable of improving the magnetic property of the strontium ferrite and the preparation example 3 is that the specific steps of the multi-stage water cooling in the step c are as follows: and (3) enabling cooling water to be in contact with the die by adopting a spraying method, stopping introducing the cooling water for 10min when the temperature of the casting is reduced to 1200 ℃, then introducing the cooling water again, stopping introducing the cooling water when the temperature of the casting is reduced to 100 ℃, and naturally cooling to room temperature to obtain the ball blank.
Preparation example 10
The difference between the grinding steel ball capable of improving the magnetic property of the strontium ferrite and the preparation example 3 is that the specific steps of the multi-stage water cooling in the step c are as follows: and (3) enabling cooling water to be in contact with the mold by adopting a spraying method, stopping introducing the cooling water for 12.5min when the temperature of the casting is reduced to 1400 ℃, then introducing the cooling water again, stopping introducing the cooling water when the temperature of the casting is reduced to 120 ℃, and naturally cooling to room temperature to obtain the ball blank.
Preparation example 11
A grinding steel ball capable of improving the magnetic property of strontium ferrite is different from the preparation example 3 in that the polishing solution in the step d is prepared from water, phosphoric acid and nickel sulfate in a weight ratio of 1: 0.2: 0.025.
Preparation example 12
A grinding steel ball capable of improving the magnetic property of strontium ferrite is different from the preparation example 3 in that the polishing solution in the step d is prepared from water, phosphoric acid and nickel sulfate in a weight ratio of 1: 0.3: 0.05 composition.
Preparation example 13
A grinding steel ball capable of improving the magnetic property of strontium ferrite is different from the preparation example 3 in that the polishing solution in the step d is prepared from water, phosphoric acid and nickel sulfate in a weight ratio of 1: 0.4: 0.075 composition.
Preparation example 14
A grinding steel ball capable of improving the magnetic property of strontium ferrite is different from the preparation example 3 in that the polishing solution in the step d is prepared from water, phosphoric acid and nickel sulfate in a weight ratio of 1: 0.5: 0.10.
Preparation example 15
A grinding steel ball capable of improving the magnetic property of strontium ferrite is different from the preparation example 3 in that the polishing solution in the step d is prepared from water, phosphoric acid and nickel sulfate in a weight ratio of 1: 0.6: 0.125.
Examples
Example 1
The method for improving the magnetic property of the strontium ferrite comprises the following steps of:
(1) mixing raw materials: adding the components in the raw materials into a wet mixing granulator (model is GHL purchased from Yuchang Dry engineering Co., Ltd., Jiangsu) according to a corresponding ratio, and uniformly mixing by a wet method to obtain a mixture;
(2) pre-burning: presintering the mixture in air at 1100 ℃ for 3h to prepare a presintering material;
(3) crushing: mixing the pre-sintered material, water and the grinding steel balls in the preparation example 1 according to the weight ratio of 1: 1.5: 8, mixing and adding the mixture into a ball mill (purchased from Shandong Yanhua environmental protection science and technology limited), and grinding the mixture for 13 hours at the rotating speed of 20r/min to prepare slurry;
the fine grinding particle size of the slurry is controlled between 0.7 and 0.75 mu m, and the concentration of the slurry is controlled between 56 and 62 percent.
(4) Molding: drying the slurry, and forming under the action of a magnetic field when the water content of the slurry is controlled to be 30-45%, wherein the magnetizing field during forming is over 12000Oe, so as to obtain a formed body;
(5) and (3) sintering: and sintering the formed body at 300 ℃ for 2h, removing water and organic matters in the formed body, then preserving the heat at 1100 ℃ in the air for 2h, polishing, cleaning and detecting to obtain the strontium ferrite.
Examples 2 to 6
A method for improving the magnetic property of strontium ferrite, which is different from the method in example 1 in that the components of the raw materials and the corresponding weights thereof are shown in table 2.
TABLE 2 Components and weights (kg) of the raw materials in examples 1-6
Example 7
A method for improving the magnetic property of strontium ferrite, which is different from the method in example 1 in that the strontium ferrite is prepared by the following steps:
(1) mixing raw materials: adding the components in the raw materials into a wet mixing granulator (model is GHL purchased from Yuchang Dry engineering Co., Ltd., Jiangsu) according to a corresponding ratio, and uniformly mixing by a wet method to obtain a mixture;
(2) pre-burning: pre-burning the mixture in air at 1000 ℃ for 1.5h to prepare a pre-burnt material;
(3) crushing: mixing the pre-sintered material, water and the grinding steel balls in the preparation example 1 according to the weight ratio of 1: 1.5: 8, mixing and adding the mixture into a ball mill (purchased from Shandong Yanhua environmental protection science and technology Co., Ltd.), and grinding the mixture for 12 hours at the rotating speed of 15r/min to prepare slurry;
the fine grinding particle size of the slurry is controlled between 0.7 and 0.75 mu m, and the concentration of the slurry is controlled between 56 and 62 percent.
(4) Molding: drying the slurry, and forming under the action of a magnetic field when the water content of the slurry is controlled to be 30-45%, wherein the magnetizing field during forming is over 12000Oe, so as to obtain a formed body;
(5) and (3) sintering: and sintering the formed body at 200 ℃ for 1h, removing water and organic matters in the formed body, then preserving the heat in the air at 1000 ℃ for 1h, polishing, cleaning and detecting to obtain the strontium ferrite.
Example 8
A method for improving the magnetic property of strontium ferrite, which is different from the method in example 1 in that the strontium ferrite is prepared by the following steps:
(1) mixing raw materials: adding the components in the raw materials into a wet mixing granulator (model is GHL purchased from Yuchang Dry engineering Co., Ltd., Jiangsu) according to a corresponding ratio, and uniformly mixing by a wet method to obtain a mixture;
(2) pre-burning: pre-burning the mixture in air at 1200 ℃ for 4.5h to prepare a pre-burnt material;
(3) crushing: mixing the pre-sintered material, water and the grinding steel balls in the preparation example 1 according to the weight ratio of 1: 1.5: 8, mixing and adding the mixture into a ball mill (purchased from Shandong Yanhua environmental protection science and technology Co., Ltd.), and grinding the mixture for 14 hours at the rotating speed of 22.5r/min to prepare slurry;
the fine grinding particle size of the slurry is controlled between 0.7 and 0.75 mu m, and the concentration of the slurry is controlled between 56 and 62 percent.
(4) Molding: drying the slurry, and forming under the action of a magnetic field when the water content of the slurry is controlled to be 30-45%, wherein the magnetizing field during forming is over 12000Oe, so as to obtain a formed body;
(5) and (3) sintering: and sintering the formed body at 400 ℃ for 3h, removing water and organic matters in the formed body, then preserving the heat in the air at 1200 ℃ for 3h, polishing, cleaning and detecting to obtain the strontium ferrite.
Example 9
A method for improving the magnetic property of strontium ferrite, which is different from the method in example 1 in that the strontium ferrite is prepared by the following steps:
(1) mixing raw materials: adding the components in the raw materials into a wet mixing granulator (model is GHL purchased from Yuchang Dry engineering Co., Ltd., Jiangsu) according to a corresponding ratio, and uniformly mixing by a wet method to obtain a mixture;
(2) pre-burning: pre-burning the mixture in air at 1300 ℃ for 6h to prepare a pre-burned material;
(3) crushing: mixing the pre-sintered material, water and the grinding steel balls in the preparation example 1 according to the weight ratio of 1: 1.5: 8, mixing and adding the mixture into a ball mill (purchased from Shandong Yanhua environmental protection science and technology Co., Ltd.), and grinding the mixture for 15 hours at the rotating speed of 25r/min to prepare slurry;
the fine grinding particle size of the slurry is controlled between 0.7 and 0.75 mu m, and the concentration of the slurry is controlled between 56 and 62 percent.
(4) Molding: drying the slurry, and forming under the action of a magnetic field when the water content of the slurry is controlled to be 30-45%, wherein the magnetizing field during forming is over 12000Oe, so as to obtain a formed body;
(5) and (3) sintering: and sintering the formed body at 500 ℃ for 4h, removing water and organic matters in the formed body, then preserving the heat in the air at 1300 ℃ for 4h, polishing, cleaning and detecting to obtain the strontium ferrite.
Example 10
A method for improving the magnetic property of strontium ferrite, which is different from the method in example 1 in that the strontium ferrite is prepared by the following steps:
(1) mixing raw materials: adding the components in the raw materials into a wet mixing granulator (model is GHL purchased from Yuchang Dry engineering Co., Ltd., Jiangsu) according to a corresponding ratio, and uniformly mixing by a wet method to obtain a mixture;
(2) pre-burning: pre-burning the mixture in air at 1400 ℃ for 7.5h to prepare a pre-burnt material;
(3) crushing: mixing the pre-sintered material, water and the grinding steel balls in the preparation example 1 according to the weight ratio of 1: 1.5: 8, mixing and adding the mixture into a ball mill (purchased from Shandong Yanhua environmental protection science and technology Co., Ltd.), and grinding the mixture for 16 hours at the rotating speed of 30r/min to prepare slurry;
the fine grinding particle size of the slurry is controlled between 0.7 and 0.75 mu m, and the concentration of the slurry is controlled between 56 and 62 percent.
(4) Molding: drying the slurry, and forming under the action of a magnetic field when the water content of the slurry is controlled to be 30-45%, wherein the magnetizing field during forming is over 12000Oe, so as to obtain a formed body;
(5) and (3) sintering: and sintering the formed body at 600 ℃ for 5h, removing water and organic matters in the formed body, then preserving the heat in the air at 1400 ℃ for 5h, polishing, cleaning and detecting to obtain the strontium ferrite.
Example 11
The method for improving the magnetic property of the strontium ferrite is different from the method in the embodiment 3 in that the fine grinding granularity of the slurry in the step (2) is controlled to be 0.8-0.85 mu m, and the concentration of the slurry is controlled to be 62-68%.
Example 12
The method for improving the magnetic property of the strontium ferrite is different from the method in the embodiment 3 in that the fine grinding granularity of the slurry in the step (2) is controlled to be 0.9-0.95 mu m, and the concentration of the slurry is controlled to be 68-74%.
Example 13
A method for improving the magnetic property of strontium ferrite is different from embodiment 3 in that (2) the pre-sintering material, water and grinding steel balls with the grain size of 4.8mm are mixed according to the weight ratio of 1: 1: 6 and mixing.
Example 14
A method for improving the magnetic property of strontium ferrite is different from embodiment 3 in that (2) the pre-sintering material, water and grinding steel balls with the grain size of 4.8mm are mixed according to the weight ratio of 1: 1.75: 9 and mixing.
Example 15
A method for improving the magnetic property of strontium ferrite is different from embodiment 3 in that (2) the pre-sintering material, water and grinding steel balls with the grain size of 4.8mm are mixed according to the weight ratio of 1: 2: 10, and mixing.
Example 16
A method for improving the magnetic property of strontium ferrite is different from embodiment 3 in that (2) the pre-sintering material, water and grinding steel balls with the grain size of 4.8mm are mixed according to the weight ratio of 1: 2.5: 12 and mixing.
Examples 17 to 30
The method for improving the magnetic property of the strontium ferrite is different from the method in embodiment 1 in that the service conditions of the grinding steel balls are different, and the specific corresponding relation is shown in table 3.
TABLE 3 COMPARATIVE TABLE FOR USE OF GRINDED STEEL BALLS IN EXAMPLES 17-30
Comparative example
Comparative example 1
A preparation method of strontium ferrite is different from the embodiment 1 in that the used grinding steel balls are commercially available grinding steel balls with the grain size of 6.3mm, and are purchased from \37075;, kang Da Steel balls, Inc., city county.
Comparative example 2
The difference between the preparation method of the strontium ferrite and the embodiment 1 is that the preparation process of the used grinding steel ball does not contain Sb element.
Comparative example 3
The difference between the preparation method of the strontium ferrite and the embodiment 1 is that the grinding steel ball does not contain Nb element in the preparation process.
Comparative example 4
The difference between the preparation method of the strontium ferrite and the embodiment 1 is that the preparation process of the used grinding steel ball does not contain Sb and Nb elements.
Comparative example 5
The difference between the preparation method of the strontium ferrite and the embodiment 1 is that the preparation process of the used grinding steel ball does not contain Ce element.
Comparative example 6
The difference between the preparation method of the strontium ferrite and the embodiment 1 is that the preparation process of the used grinding steel ball does not contain La element.
Comparative example 7
The difference between the preparation method of the strontium ferrite and the embodiment 1 is that the preparation process of the used grinding steel ball does not contain Ce and La elements.
Comparative example 8
A method for preparing strontium ferrite, which is different from the embodiment 1 in that the preparation process of the grinding steel ball does not comprise a multi-stage water cooling step.
Performance test
Detection method
38 groups of strontium ferrites prepared in examples 1-30 and comparative examples 1-8 were used as test objects, and the specific detection standards and detection procedures were summarized and summarized in GB/T3217-South pointing, testing the remanence B of strontium ferriterMagnetic flux density coercive force HcBIntrinsic coercive force HcJMaximum magnetic energy product (BH)maxThe magnetic properties of the strontium ferrite were evaluated, and the test results are shown in Table 4 below.
TABLE 4 results of magnetic property test
It can be seen from the combination of examples 1-6 and comparative example 1 and table 4 that the strontium ferrites prepared by the preparation methods of examples 1-6 have high magnetic properties, and the strontium ferrite prepared by the raw material composition ratio of example 3 has good magnetic properties and remanence Br4294Gs, its magnetic flux density coercive force HcB4025Oe, its intrinsic coercivity HcJ4924Oe, its maximum magnetic energy product (BH)maxIs 4.4KJ/m3。
It can be seen from the combination of example 1, examples 7 to 10 and table 4 that the strontium ferrite prepared by using the process of example 8 as the optimal process has good magnetic properties and a remanence Br4194Gs, its magnetic flux density coercive force HcB3889Oe, its intrinsic coercivity HcJ4757Oe, its maximum magnetic energy product (BH)maxIs 4.2KJ/m3。
It can be seen from the combination of examples 1, 11-12 and table 4 that the strontium ferrite prepared in example 11 with the optimum grain size and slurry concentration has good magnetic properties and a good remanence Br4337Gs, its magnetic flux density coercive force HcB4065Oe, its intrinsic coercivity HcJIs 4973Oe, maximum energy product (BH) thereofmaxIs 4.4KJ/m3。
It can be seen from the combination of examples 3, 13-16 and table 4 that the ratio of the pre-sintered material, the milled steel balls with a particle size of 4.8mm and water in example 14 is the optimum ratio, and the strontium ferrite prepared under the condition of the optimum ratio has good magnetic properties and a remanence Br4363Gs, its magnetic flux density coercive force HcB4089Oe, its intrinsic coercivity HcJ5003Oe, maximum magnetic energy product (BH)maxIs 4.5KJ/m3。
It can be seen from the combination of examples 1, 17 to 21, and comparative examples 2 to 7 and the combination of table 4 that example 18 is the most preferred example, that is, the composition ratio of the steel balls for grinding in preparation example 3 is the most preferred ratio, and the addition amounts of Sb, Nb, Ce, and La elements are the most preferred addition amounts, so that the strontium ferrite has the best improvement effect, and the residual magnetism B of the strontium ferrite prepared by the preparation method is the bestr4378Gs, its magnetic flux density coercive force HcB4104Oe, intrinsic coercivity HcJ5020Oe, maximum magnetic energy product (BH)maxIs 4.4KJ/m3。
It can be seen from the combination of examples 1, 22-25, and 8 and table 4 that example 23 is the most preferred example, that is, the multi-stage water cooling process in preparation example 8 is the most preferred process, and by using the water cooling method, the improvement effect on the strontium ferrite is the best, and the remanence B of the prepared strontium ferrite is the bestr4220Gs, its magnetic flux density coercive force HcBIs 3955Oe, its intrinsic coercive force HcJ4838Oe, its maximum magnetic energy product (BH)maxIs 4.3KJ/m3。
It can be seen from the combination of examples 1, 26-30 and table 4 that example 28 is the most preferred example, that is, the polishing solution ratio in preparation example 13 is the most preferred ratio, and the polished steel balls prepared from the polishing solution have the best effect of improving strontium ferrite, and the remanence B of the prepared strontium ferrite is the bestr4258Gs, its magnetic flux density coercive force HcB3991Oe, its intrinsic coercivity HcJ4882Oe, its maximum energy product (BH)maxIs 4.3KJ/m3。
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A grinding steel ball capable of improving the magnetic property of strontium ferrite is characterized by comprising the following components in percentage by weight:
Mn: 2.5-3.5wt.%；
C: 1.8-2.3wt.%；
Cr: 11.0-16.0wt.%；
O: 0.02-0.07wt.%；
Si:1.5-2.0wt.%；
Ni：0.3-1.6wt.%；
Cu：0.7-1.1wt.%；
Sb: 0.11-0.18wt.%；
Nb: 0.08-0.12wt.%；
Ce:0.42-0.50wt.%；
La:0.42-0.50wt.%；
the balance being Fe;
the diameter of the grinding steel ball is 4.5-5.0 mm.
2. The grinding steel ball capable of improving the magnetic property of the strontium ferrite as claimed in claim 1, is characterized by comprising the following components in percentage by weight:
Mn: 2.8-3.2wt.%；
C: 1.9-2.1wt.%；
Cr: 12.0-15.0wt.%；
O: 0.025-0.035wt.%；
Si:1.7-1.8wt.%；
Ni：0.8-1.2wt.%；
Cu：0.8-1.0wt.%；
Sb: 0.14-0.18wt.%；
Nb: 0.09-0.11wt.%；
Ce:0.45-0.48wt.%；
La:0.45-0.48wt.%；
the balance being Fe;
the diameter of the grinding steel ball is 4.8 mm.
3. The preparation method of the grinding steel ball capable of improving the magnetic property of the strontium ferrite as claimed in any one of claims 1 to 2, which is characterized by comprising the following preparation steps:
a. smelting: smelting the components at 1900-2250 ℃ according to the corresponding proportion to prepare a casting liquid;
b. casting: pouring the casting liquid into the mold, wherein the pouring temperature of the casting liquid is 1900-2250 ℃ to prepare a casting;
c. and (3) cooling: slowly cooling the casting by adopting a multi-section water cooling mode, and cooling to room temperature to obtain a ball blank;
d. grinding and polishing: and (3) physically polishing an oxide layer and a raised part on the surface of the ball blank by a sand grinding method, then placing the ball blank in polishing solution for secondary polishing, and obtaining the grinding steel ball after polishing.
4. The preparation method of the grinding steel ball capable of improving the magnetic property of the strontium ferrite as claimed in claim 3, wherein the specific steps of the multi-stage water cooling in the step c are as follows: and (3) adopting any one of a spraying method and a soaking method to enable cooling water to be in contact with the mold, stopping introducing the cooling water for 5-10min when the temperature of the casting is reduced to 1000-1200 ℃, then introducing the cooling water again, stopping introducing the cooling water when the temperature of the casting is reduced to 80-100 ℃, and naturally cooling to room temperature to obtain the ball blank.
5. The method for preparing a grinding steel ball capable of improving the magnetic property of strontium ferrite according to claim 3, wherein the polishing solution in the step d is prepared from water, phosphoric acid and nickel sulfate in a weight ratio of 1: (0.3-0.5): (0.05-0.10).
6. A method for improving the magnetic property of strontium ferrite, which is applied to grinding steel balls according to any one of claims 1 to 5, and is characterized by comprising the following specific steps:
(1) mixing raw materials: uniformly mixing all components in the raw materials according to a corresponding proportion by a wet method to prepare a mixture;
the raw materials comprise the following components in percentage by weight:
SrO 4.7-5.7wt.%；
Ca 1.5-2.8wt.%；
Si 0.1-0.13wt.%；
La2O3 7.0-8.2wt.%；
CaCO3 0.7-1.2wt.%；
Ba 0.05-0.1wt.%；
the balance being Fe2O3 Composition is carried out;
(2) pre-burning: pre-burning the mixture in air at 1100-;
(3) crushing: mixing the pre-sintered material, water and the grinding steel ball according to the weight ratio of 1: (1.5-2.0): (8-10) mixing, and grinding at a rotating speed of 20-25r/min for 13-15h to obtain slurry;
(4) molding: drying the slurry, and forming under the action of a magnetic field when the water content of the slurry is controlled to be 30-45%, wherein the magnetizing field during forming is over 12000Oe, so as to obtain a formed body;
(5) and (3) sintering: sintering the formed body at the temperature of 300-500 ℃ for 2-4h, removing water and organic matters in the formed body, then preserving the heat at the temperature of 1100-1300 ℃ for 2-4h in the air, and then grinding, cleaning and detecting to obtain the strontium ferrite.
7. The method for improving the magnetic property of strontium ferrite according to claim 6, wherein the fine grinding particle size of the slurry is controlled to be between 0.8-0.85 μm, and the concentration of the slurry is controlled to be between 62% -68%.
8. The method for improving the magnetic properties of strontium ferrite according to claim 6, wherein the raw materials comprise the following components by weight percent:
SrO 5.0-5.4wt.%；
Ca 1.8-2.5wt.%；
Si 0.11-0.12wt.%；
La2O3 7.4-7.8wt.%；
CaCO3 0.9-1.0wt.%；
Ba 0.06-0.08wt.%；
the balance being Fe2O3 And (4) forming.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01201441A (en) * | 1987-06-11 | 1989-08-14 | Aichi Steel Works Ltd | Alloy steel having excellent wear resistance |
| JPH0586435A (en) * | 1991-09-27 | 1993-04-06 | Hitachi Metals Ltd | Tool parts material having high corrosion resistance and high wear resistance |
| JP2006316309A (en) * | 2005-05-12 | 2006-11-24 | Nachi Fujikoshi Corp | High wear resistant tough steel having excellent fatigue strength |
| CN103265277A (en) * | 2013-06-14 | 2013-08-28 | 南通飞来福磁铁有限公司 | Preparation method of permanent magnetic ferrite |
| CN106756467A (en) * | 2017-01-09 | 2017-05-31 | 岳阳市金扶羊新材料技术有限公司 | Cylinder mill lining plate, new high chromium cast iron high-abrasive material and preparation method thereof |
-
2021
- 2021-06-19 CN CN202110681670.4A patent/CN113416898B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01201441A (en) * | 1987-06-11 | 1989-08-14 | Aichi Steel Works Ltd | Alloy steel having excellent wear resistance |
| JPH0586435A (en) * | 1991-09-27 | 1993-04-06 | Hitachi Metals Ltd | Tool parts material having high corrosion resistance and high wear resistance |
| JP2006316309A (en) * | 2005-05-12 | 2006-11-24 | Nachi Fujikoshi Corp | High wear resistant tough steel having excellent fatigue strength |
| CN103265277A (en) * | 2013-06-14 | 2013-08-28 | 南通飞来福磁铁有限公司 | Preparation method of permanent magnetic ferrite |
| CN106756467A (en) * | 2017-01-09 | 2017-05-31 | 岳阳市金扶羊新材料技术有限公司 | Cylinder mill lining plate, new high chromium cast iron high-abrasive material and preparation method thereof |
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