CN109133928B - Special hammer head for hammer crusher and preparation method thereof - Google Patents
Special hammer head for hammer crusher and preparation method thereof Download PDFInfo
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- CN109133928B CN109133928B CN201811106958.3A CN201811106958A CN109133928B CN 109133928 B CN109133928 B CN 109133928B CN 201811106958 A CN201811106958 A CN 201811106958A CN 109133928 B CN109133928 B CN 109133928B
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/5607—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on refractory metal carbides
- C04B35/5626—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on refractory metal carbides based on tungsten carbides
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63444—Nitrogen-containing polymers, e.g. polyacrylamides, polyacrylonitriles, polyvinylpyrrolidone [PVP], polyethylenimine [PEI]
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
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- C04B2235/424—Carbon black
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Abstract
The invention discloses a special hammer head for a hammer crusher, which is prepared by mixing 91-93% of tungsten carbide, 2-2.5% of carbon black, 2-2.5% of a binder, 0.25-0.5% of titanium carbide, 0.25-0.5% of chromium carbide and 2.5-3.5% of pure water and then sintering at a high temperature. The invention has scientific raw material proportion, takes tungsten carbide as a main raw material and is supplemented with carbon black, a binder, titanium carbide, chromium carbide and pure water, the tungsten carbide has super-strong hardness, the carbon black removes oxygen ions in mixed oxygen and other oxides in the material, the product characteristics can be improved, the titanium carbide and the chromium carbide reduce the alloy sintering temperature, the strength and the toughness of a finished product are improved, the pure water ensures the physical blending uniformity and ensures the isostatic pressing of the material together with the binder. When the finished product hammer head is used for crushing hard materials such as carbonized stone and the like, the service life of the finished product hammer head is prolonged by 3-5 times compared with that of common steel, the service life is greatly prolonged, the maintenance cost and the labor intensity of maintenance personnel are saved, and the working efficiency is improved; meanwhile, the paint can be used in complex environmental conditions, and the use effect of the paint is not influenced at the temperature of 150 ℃.
Description
Technical Field
The invention relates to a hammer crusher, in particular to a special hammer head for the hammer crusher, and further comprises a preparation method of the special hammer head for the hammer crusher.
Background
The hammer crusher (hammer crusher) is used for crushing various medium-hard and weak-abrasiveness materials, generally speaking, the compression strength of the materials is not more than 100MPa, the water content is less than 15%, the crushed materials are coal, salt, chalk, gypsum, tiles, limestone, shale and the like, and the hammer crusher is also used for crushing broken wood, paper or waste materials of broken asbestos cement with strong fiber structure, elasticity and toughness to recycle asbestos fibers and the like.
The hammer head is a main working part of the hammer crusher, the hammer head used by the existing hammer crusher is a manganese alloy hammer head, although the hammer head is more wear-resistant than common carbon steel, the hardness is obviously improved, and the effects of crushing kaolin, limestone, slag, marble and cobblestone are obvious, when materials with higher hardness and toughness such as carbo-fossil (such as carbo-silica) and the like are crushed, the hammer head is seriously worn, and the time and labor are wasted when parts are replaced, so that the production efficiency is extremely low.
Disclosure of Invention
The invention aims to provide a special hammer head for a hammer crusher, which can crush materials with higher hardness and toughness, and the hammer head does not influence normal use at the temperature of 150 ℃, thereby greatly improving the working efficiency; the invention also provides a preparation method of the special hammer head for the hammer crusher.
In order to achieve the purpose, the invention can adopt the following technical scheme:
the special hammer head for the hammer crusher is prepared by mixing the raw materials of tungsten carbide, carbon black, a binder, titanium carbide, chromium carbide and pure water according to the following weight percentage and then sintering at a high temperature: 91-93% of tungsten carbide, 2-2.5% of carbon black, 2-2.5% of binder, 0.25-0.5% of titanium carbide, 0.25-0.5% of chromium carbide and 2.5-3.5% of pure water.
The binder is polyvinylpyrrolidone with the viscosity of 39.5-45.8 mpa.s (millipascal seconds).
The content of tungsten carbide in the tungsten carbide raw material is more than or equal to 99%, and the granularity of the tungsten carbide raw material is 8-10 mu m; the carbon black is high-purity carbon black, and the ash content of the carbon black is less than 0.01 percent; the titanium content in the titanium carbide raw material is more than or equal to 99.5%, and the granularity is 5-7 mu m; the chromium content in the chromium carbide raw material is more than or equal to 99.5%, and the particle size is 5-7 mu m; the conductivity of the pure water is less than 10 mu s/cm.
The preparation method of the special hammer head for the hammer crusher comprises the following specific steps:
step one, weighing 90-92% of tungsten carbide, 2-2.5% of carbon black, 2-2.5% of binder, 0.25-0.5% of titanium carbide, 0.25-0.5% of chromium carbide and 3-3.5% of pure water according to weight ratio, and putting the materials into a mixer for uniformly mixing;
secondly, putting the mixed materials into a die, carrying out isostatic pressing under the pressure of 600MPa, naturally drying the formed hammer head blank for 24 hours at room temperature, then drying the hammer head blank for 8 hours at the temperature of 60 +/-5 ℃, and drying the hammer head blank for 3 hours at the temperature of 105 +/-5 ℃;
thirdly, sintering the dried hammer blank for 1.5-2 hours at the temperature of 1500-1650 ℃ under the protection of nitrogen; then the temperature is reduced to room temperature by a temperature reduction gradient of 100 ℃/hour, and a finished product hammer with Vickers hardness of more than 2500HV30, bending strength of more than 850MPa and relative density of more than 98 percent is obtained.
The invention has the advantages that the raw material proportion is scientific, tungsten carbide is taken as a main raw material, and carbon black, a binder, titanium carbide, chromium carbide and pure water are used as auxiliary materials, the tungsten carbide has super hardness, oxygen ions in mixed oxygen and other oxides in the materials are removed by the carbon black, the product characteristics can be improved, the titanium carbide and the chromium carbide reduce the alloy sintering temperature, the strength and the toughness of a finished product are improved, the pure water ensures the physical blending uniformity, and the pure water and the binder ensure the isostatic compaction of the materials. When the finished product hammer head is used for crushing hard materials such as carbonized stone and the like, the service life of the finished product hammer head is prolonged by 3-5 times compared with that of common steel, the service life is greatly prolonged, the maintenance cost and the labor intensity of maintenance personnel are saved, and the working efficiency is improved; meanwhile, the paint can be used in complex environmental conditions, and the use effect of the paint is not influenced at the temperature of 150 ℃.
Drawings
Fig. 1 is a schematic structural view of the hammer head of the present invention.
Detailed Description
The special hammer head for the hammer crusher comprises the following raw materials in parts by weight: 91-93%, 2-2.5% of carbon black, 2-2.5% of binder, 0.25-0.5% of titanium carbide, 0.25-0.5% of chromium carbide and 2.5-3.5% of pure water.
In actual preparation, in order to ensure that the quality of the hammer head meets the use requirement, the content of tungsten carbide in the tungsten carbide raw material is more than or equal to 99 percent, and the granularity of the tungsten carbide raw material is 8-10 mu m; the carbon black is high-purity carbon black, and the ash content of the carbon black is less than 0.01 percent; the titanium content in the titanium carbide raw material is more than or equal to 99.5 percent, and the granularity is 5-7 mu m; the chromium content in the chromium carbide raw material is more than or equal to 99.5 percent, and the particle size is 5-7 mu m; the conductivity of pure water is less than 10 mu s/cm. The binder is polyvinylpyrrolidone with the viscosity of 39.5-45.8 mpa.s.
The preparation method of the special hammer head for the hammer crusher comprises the following specific steps:
firstly, accurately weighing the following raw materials in percentage by weight: 91-93%, 2-2.5% of carbon black, 2-2.5% of binder, 0.25-0.5% of titanium carbide, 0.25-0.5% of chromium carbide and 2.5-3.5% of pure water; putting the mixture into a mixer to be mixed for 45-60 minutes to ensure that the mixture is uniformly mixed;
secondly, putting the mixed materials into a die, carrying out isostatic pressing under the pressure of 600MPa, naturally drying the formed hammer head blank for 24 hours at room temperature, then drying for 8 hours at the temperature of 60 ℃, and drying for 3 hours at the temperature of 105 ℃;
thirdly, sintering the dried hammer head blank at a high temperature for 1.5-2 hours at the temperature of 1500-1650 ℃ under the protection of nitrogen; and then reducing the temperature to room temperature by a temperature reduction gradient of 100 ℃/hour to obtain the finished product hammer head shown in figure 1.
The hardness of the hammer produced by the invention is measured by adopting a microhardness tester, the bending strength of the hammer is measured by adopting a bending strength tester, and the relative density is measured by adopting a method for measuring the density of products in GB/T4472-.
After the detection according to the method, the Vickers hardness of the tungsten carbide hammer head prepared by the invention is more than 2500HV30, the bending strength is more than 850MPa, and the relative density is more than 98%.
The manganese alloy hammer head used by the current hammer crusher and the tungsten carbide hammer head fired by the invention crush the carbo-silica synthetic crystal (a columnar forming body with the diameter of 28mm and the height of 50 mm) under the same environmental condition, the manganese alloy hammer head can be used for 3-5 days (72-120 hours), the tungsten carbide hammer head can be used for 9-15 days (216-360 hours), and the service life of the tungsten carbide hammer head is greatly prolonged.
Claims (2)
1. The preparation method of the special hammer head for the hammer crusher is characterized by comprising the following steps of: the hammer head is formed by mixing the raw materials of tungsten carbide, carbon black, a binder, titanium carbide, chromium carbide and pure water according to the following weight percentage and then sintering at high temperature: 91-93% of tungsten carbide, 2-2.5% of carbon black, 2-2.5% of binder, 0.25-0.5% of titanium carbide, 0.25-0.5% of chromium carbide and 2.5-3.5% of pure water; the binder is polyvinylpyrrolidone with the viscosity of 39.5-45.8 mpa.s; the content of tungsten carbide in the tungsten carbide raw material is more than or equal to 99%, and the granularity of the tungsten carbide raw material is 8-10 mu m; the carbon black is high-purity carbon black, and the ash content of the carbon black is less than 0.01 percent; the granularity of the titanium carbide is 5-7 mu m; the particle size of the chromium carbide is 5-7 mu m; the conductivity of the pure water is less than 10 mu s/cm;
the preparation method comprises the following specific steps:
firstly, weighing tungsten carbide, carbon black, a binder, titanium carbide, chromium carbide and pure water according to the weight ratio, and putting the materials into a mixer for uniform mixing;
secondly, putting the mixed materials into a die, carrying out isostatic pressing under the pressure of 600MPa, naturally drying the formed hammer head blank for 24 hours at room temperature, then drying the hammer head blank for 8 hours at the temperature of 60 +/-5 ℃, and drying the hammer head blank for 3 hours at the temperature of 105 +/-5 ℃;
thirdly, sintering the dried hammer blank for 1.5-2 hours at the temperature of 1500-1650 ℃ under the protection of nitrogen; then the temperature is reduced to room temperature by a temperature reduction gradient of 100 ℃/hour, and a finished product hammer with Vickers hardness of more than 2500HV30, bending strength of more than 850MPa and relative density of more than 98 percent is obtained.
2. A hammer head made according to the method of claim 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811106958.3A CN109133928B (en) | 2018-09-21 | 2018-09-21 | Special hammer head for hammer crusher and preparation method thereof |
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| CN201811106958.3A CN109133928B (en) | 2018-09-21 | 2018-09-21 | Special hammer head for hammer crusher and preparation method thereof |
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| CN109133928A CN109133928A (en) | 2019-01-04 |
| CN109133928B true CN109133928B (en) | 2021-06-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080131621A1 (en) * | 2006-12-05 | 2008-06-05 | Warran Boyd Lineton | Method for fusing hard ceramic-metallic layer on a brake rotor |
| CN102021464B (en) * | 2010-12-15 | 2012-02-01 | 中国铝业股份有限公司 | Material for aluminium electrolysis crust breaking chip |
| CN102600928B (en) * | 2012-02-29 | 2015-07-08 | 中国地质大学（北京） | Inserted tooth hammer of crushing machine |
| CN104451322B (en) * | 2014-11-25 | 2016-11-30 | 广东工业大学 | A kind of tungsten carbide base carbide alloy and preparation method thereof |
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