CN115304380A - Silicon carbide roller rod for roller kiln transmission and preparation method and application thereof - Google Patents
Silicon carbide roller rod for roller kiln transmission and preparation method and application thereof Download PDFInfo
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
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- F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
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Abstract
The invention relates to a silicon carbide roller rod for roller kiln transmission, and a preparation method and application thereof, wherein the mass fraction of silicon carbide in the silicon carbide roller rod for roller kiln transmission is more than 85%, and the density is more than or equal to 3.02kg/m 3 The porosity is less than 0.1%, and the bending strength at 1200 ℃ is 330 MPa-360 MPa. And the straightness reaches 0.1-0.8 per mill. The preparation method of the silicon carbide roller rod comprises the following steps: the method comprises the steps of material mixing, vacuum forming, drying, shaping, reaction sintering, sand blasting, testing, packaging and the like. According to the invention, through reasonable doping proportion of the old material and the raw material and strict control of the material mixing process, the obtained silicon carbide roller rod is used as a transmission device of the lithium battery anode and cathode material sintering roller kiln, has good performance and long service life, and is suitable for popularization and application.
Description
Technical Field
The invention relates to the field of new energy, in particular to a silicon carbide roller rod for roller kiln transmission and a preparation method and application thereof.
Background
With the rapid development of the new energy lithium battery field, the requirements on preparation equipment of related products are higher and higher. In the prior art, the silicon carbide roller rod most commonly used in a lithium electric kiln is poor in thermal shock resistance and easy to crack when used at high temperature, and when the temperature is too high, the high-temperature load of the silicon carbide roller rod can be rapidly reduced along with the temperature rise, so that the service life of the silicon carbide roller rod is short. Although the performance of the silicon carbide roller is improved compared with that of an aluminum oxide roller, the manufacturing cost is also correspondingly improved, and the problems of short service life, incapability of meeting the use requirement of high-temperature performance and the like still exist, so that the large-scale application of the silicon carbide roller is influenced to a certain extent. In addition, silicon carbide waste is generated in the vacuum forming step, and the waste is directly abandoned, so that not only is the environment polluted, but also the waste of raw materials is caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a silicon carbide roller rod for roller kiln transmission and a preparation method and application thereof.
On one hand, the invention provides a silicon carbide roller rod for roller kiln transmission, wherein the mass fraction of silicon carbide in the roller rod is more than or equal to 85%, the density is more than or equal to 3.02kg/m < 3 >, the porosity is less than 0.1%, and the bending strength at 1200 ℃ is 330 MPa-360 MPa.
Furthermore, the silicon carbide roller for the roller kiln transmission is a roller with the straightness of 0.1-0.8 per thousand.
On the other hand, the invention provides a preparation method of the silicon carbide roller rod for transmission of the roller kiln, which comprises the following steps: preparing materials, mixing materials, vacuum forming, drying, shaping, reacting and sintering, sand blasting, testing and packaging; the ingredients comprise 3-5% of graphite powder, 4-7% of carbon black, 1-8% of cellulose and the balance of silicon carbide powder.
The ingredients also comprise 5-50% of old material powder.
The waste material powder is obtained by ball milling and crushing waste materials generated in the vacuum forming step, the waste material powder comprises 85-90% by mass of silicon carbide, graphite powder, carbon black and cellulose, and the D50 particle size of the waste material powder is 20-40 mu m; furthermore, the D50 particle size of the used powder is 30-35 μm.
Further, in the material preparation step of the preparation method, the silicon carbide powder comprises: 8 to 12 parts of silicon carbide powder A with the grain diameter of 150 to 178 mu m, 8 to 12 parts of silicon carbide powder B with the grain diameter of 90 to 104 mu m, 16 to 20 parts of silicon carbide powder C with the grain diameter of 74 to 85 mu m, 16 to 20 parts of silicon carbide powder D with the grain diameter of 58 to 65 mu m and 18 to 22 parts of silicon carbide powder E with the grain diameter of 3 to 5 mu m. By adopting the specific silicon carbide powder with a proper proportion, the problems of low biscuit density, insufficient strength and the like which possibly occur in the subsequent steps can be solved.
Further, the mixing step of the preparation method comprises dry mixing and wet mixing, wherein the wet mixing time is 5-7 times of the dry mixing time, and the dry mixing time is 20-30 min; the dry mixing process comprises the steps of firstly stirring and mixing silicon carbide powder A, silicon carbide powder B and silicon carbide powder C to obtain a mixed material A, and stirring and mixing silicon carbide powder D and silicon carbide powder E to obtain a mixed material B; stirring and mixing the mixed material A and the mixed material B to obtain a mixed material C; and finally, stirring and mixing the mixed material C with graphite powder, carbon black, cellulose and the old material in sequence to obtain a mixed material.
Furthermore, a high-speed stirrer is used in the dry mixing process of the preparation method, the stirring speed is 1300-1500 r/min, and the apparent density of the mixture is 1.0-1.2 g/cm 3 。
Further, a stirring pot which is sealed by a cover is used in the wet mixing process of the preparation method, the wet mixing process specifically comprises the steps of adding a proper amount of polyvinyl alcohol and water for 2-4 times, wherein the mass ratio of the polyvinyl alcohol to the water is 1-1.1; and circulating water is adopted for cooling in the stirring process, so that the temperature of the stirring pot is kept at 25-40 ℃, and the water content of the pug is 10-15%.
The dry mixing and wet mixing processes can also adopt a ball mill mixer for stirring.
Further, the wet mixing process specifically comprises the steps of adding a proper amount of polyvinyl alcohol and water for 3 times, stirring for 40min each time, wherein the mass ratio of the polyvinyl alcohol to the water added each time is (1-1.1) and is 25-27, and stirring for 3 times to obtain the pug.
Because of the doping utilization of the old material, the water content of the pug must be strictly controlled within the range of 10-15% in the material mixing process, otherwise, the high-temperature performance, the qualified density, the porosity, the heat conductivity coefficient and other performances of the high-silicon carbide rod are difficult to realize and improve through the temperature control in the subsequent reaction sintering process.
Furthermore, the vacuum degree of the vacuum forming process of the preparation method is less than-0.085 Pa, the forming pressure is 3-12 MPa, the vacuum forming process also adopts circulating water cooling, the forming temperature is kept at 25-40 ℃, and both ends of the formed roll bar biscuit are inclined planes.
If the temperature is too high in the forming process, the toughness of the pug is affected, so that the setting property is poor and the requirements cannot be met, and on the contrary, if the temperature is lower than 25 ℃, the fluidity and the lubricity of the pug are greatly reduced, and the roll bar biscuit meeting the requirements cannot be produced.
Further, the shaping process includes port cutting and hole punching. And the port cutting step is to cut off inclined planes at two ends of the dried biscuit to enable two ends of the roll bar biscuit to be flush, and then to punch holes at specific positions according to requirements.
Further, si particles coated by carbon black are laid on the upper surface of the silicon carbide roller rod in the reaction sintering process of the preparation method, the carbon black is irregular particles with purity of more than 99.5 percent and has the size of 35-50 mu m, and the content of Fe, al and Ca in the carbon black is not more than 0.3 percent, 0.1 percent and 0.05 percent; the Si particles are also irregular in shape and 1-3 cm in size; the thickness of the carbon black coating layer of the Si particles coated with the carbon black is 0.05-0.3 mm. Wherein the mass of the laid carbon black coated Si particles is 40-60% of the mass of the covered biscuit, although the laying thickness is not more than 5cm, the Si-rich state is always kept in the whole reaction sintering process.
The carbon black layer coated on the surface of the Si particles has the main function of controlling the liquefaction condition of the Si particles, in the reaction sintering process, on one hand, the liquefied Si reacts with carbon elements in a biscuit to generate silicon carbide, on the other hand, the residual Si after the reaction is used for filling pores in the biscuit, so that a compact roller rod with good performance is finally formed, and the size of the roller rod after the reaction sintering can expand by 0.5 per thousand to 0.7 per thousand compared with the biscuit before sintering. The thickness of the carbon black layer coated on the surface of the Si particle needs to be proper, and if the thickness is too thick, the liquefaction and permeation process of Si can be hindered, so that the reaction sintering process is not performed fully, and the waste of the Si particle is caused; on the contrary, the too thin coating layer can lead to the too fast liquefaction speed of the Si particles, and the contact time of the liquefied Si and the biscuit is too short, which also causes incomplete reaction in sintering and influences the product performance.
Furthermore, irregular silicon carbide powder with the mass fraction of more than 98% is adopted for sand blasting in the sand blasting step, the size of the silicon carbide powder is 0.5-0.8 mm, and the spraying air pressure in the sand blasting step is 0.3-0.8 MPa.
The silicon carbide roller rod is used as a transmission device of a lithium battery anode and cathode material sintering roller kiln.
The beneficial effects of the invention include:
the silicon carbide roller rod for the transmission of the roller kiln is far better than the national standard in use performance, the straightness of the roller rod is 0.1-0.8 thousandth, and the density is more than or equal to 3.02kg/m 3 The porosity is less than 0.1%, and the bending strength at 1200 ℃ is 330MPa to 360MPa. The preparation method of the silicon carbide roller rod can accurately control each step, is simple to operate and is suitable for large-scale production and application. In the burdening link of the preparation method, the old material can be recycled as the waste material generated in the vacuum forming step, and the finally prepared silicon carbide roller rod has excellent thermal shock resistance and oxidation resistance, is very durable when being used as a transmission device of a lithium battery anode and cathode material sintering roller kiln, and has long service life.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below. Those who do not specify specific conditions in the specific embodiment will follow conventional conditions or conditions recommended by the manufacturer.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
The silicon carbide roller rod for roller kiln transmission is characterized in that the mass fraction of silicon carbide in the roller rod is more than 85 percentThe density of the roller rod is more than or equal to 3.02kg/m 3 The porosity is less than 0.1%, the bending strength at 1200 ℃ is 330 MPa-360 MPa, and the straightness reaches 0.1-0.8 per thousand.
Example 2
Embodiment 2 of the invention is a preparation method of a silicon carbide roller rod for roller kiln transmission, which specifically comprises the following steps: proportioning, mixing, vacuum forming, drying, shaping, reaction sintering, sand blasting, testing and packaging.
The burdening step comprises 3-5% of graphite powder, 4-7% of carbon black, 1-8% of cellulose, 5-50% of old material powder and the balance of silicon carbide powder by mass percentage; the waste material powder is obtained by ball milling and crushing waste materials generated in the vacuum forming step, the waste material powder comprises 85-90% of silicon carbide by mass, and the balance of the silicon carbide powder comprises graphite powder, carbon black and cellulose, and in the embodiment, the D50 particle size of the waste material powder is 30-35 microns. The silicon carbide powder comprises: 8 to 12 parts of silicon carbide powder A with the grain diameter of 150 to 178 mu m, 8 to 12 parts of silicon carbide powder B with the grain diameter of 90 to 104 mu m, 16 to 20 parts of silicon carbide powder C with the grain diameter of 74 to 85 mu m, 16 to 20 parts of silicon carbide powder D with the grain diameter of 58 to 65 mu m and 18 to 22 parts of silicon carbide powder E with the grain diameter of 3 to 5 mu m. By adopting the specific silicon carbide powder with a proper proportion, the problems of low biscuit density, insufficient strength and the like which possibly occur in the subsequent steps can be solved.
The material mixing step comprises dry mixing and wet mixing, wherein the wet mixing time is 5-7 times of the dry mixing time, and the dry mixing time is 20-30 min; the dry mixing process comprises the steps of firstly stirring and mixing silicon carbide powder A, silicon carbide powder B and silicon carbide powder C to obtain a mixed material A, and stirring and mixing silicon carbide powder D and silicon carbide powder E to obtain a mixed material B; stirring and mixing the mixed material A and the mixed material B to obtain a mixed material C; and finally, stirring and mixing the mixed material C with graphite powder, carbon black, cellulose and the old material part in sequence to obtain a mixed material. The dry mixing process uses a high-speed stirrer, the stirring speed is 1300-1500 r/min, and the apparent density of the mixture is 1.0-1.2 g/cm 3 。
A stirring pot which is covered and sealed is used in the wet mixing process, the wet mixing process specifically comprises the steps of adding a proper amount of polyvinyl alcohol and water for 2-4 times, wherein the mass ratio of the polyvinyl alcohol to the water is 1-1.1; the stirring process adopts circulating water for cooling, so that the temperature of the stirring kettle is kept between 25 and 40 ℃. In this embodiment, the wet mixing process specifically includes adding an appropriate amount of polyvinyl alcohol and water 3 times, stirring for 40min each time, wherein the mass ratio of the polyvinyl alcohol to the water added each time is 1.
In the embodiment, the pug is required to be refined and aged within 24 hours, and the aging process is aged for 2-5 days in spring and autumn; in summer, the mixture is aged for 1 to 2 days; and in winter, the mixture is aged for 3 to 8 days.
The vacuum degree of the vacuum forming process is less than-0.085 Pa, the forming pressure is 3-12 MPa, the vacuum forming process also adopts circulating water cooling, the forming temperature is kept at 25-40 ℃, and both ends of the formed roll bar biscuit are inclined planes.
The heating rate of the drying process is 5 ℃/h, the heat preservation temperature is 45 ℃, the heat preservation time is 10h, and then the product is naturally cooled.
The shaping process includes port cutting and puncturing. And the port cutting step is to cut off inclined planes at two ends of the dried biscuit to enable two ends of the roll bar biscuit to be flush, and then to punch holes at specific positions according to requirements.
The sintering temperature in the reaction sintering process is 1680-1850 ℃, and the sintering time is 160-200 min; si particles coated by carbon black need to be laid on the upper surface of the silicon carbide roller in the reaction sintering process, the carbon black is irregular particles with the purity of more than 99.5 percent and the size of 35-50 mu m, and the content of Fe, al and Ca in the carbon black is not more than 0.3 percent, 0.1 percent and 0.05 percent; the Si particles are also irregular in shape and 1-3 cm in size; the thickness of the carbon black coating layer of the Si particles coated with carbon black was 0.05mm. Wherein the mass of the laid carbon black coated Si particles is 40-60% of the mass of the covered biscuit, although the laying thickness is not more than 5cm, the Si-rich state is always kept in the whole reaction sintering process.
In the sand blasting step, irregular silicon carbide powder with the mass fraction of more than 98% is adopted for sand blasting, the size of the silicon carbide powder is 0.5-0.8 mm, and the jet air pressure in the sand blasting step is 0.3-0.8 MPa.
The testing process comprises the steps of detecting the strength and the straightness of the roller. The bending strength of the roll bar of example 2 at room temperature was 300MPa, the bending strength of the roll bar at 1200 ℃ was 330MPa, the straightness was 0.8 ‰, and the density was 3.02kg/m 3 The porosity was 0.09%.
Example 3:
this embodiment differs from embodiment 2 only in that: the batching step comprises 4% of graphite powder, 5% of carbon black, 5% of cellulose, 45% of old material powder and the balance of silicon carbide powder by mass.
The bending strength of the roll bar of example 3 at room temperature was 300MPa, the bending strength of the roll bar at 1200 ℃ was 350MPa, the straightness was 0.2 ‰, and the density was 4.28kg/m 3 The porosity was 0.05%.
Example 4:
the present embodiment is different from embodiment 2 only in that: the batching step comprises 4.5% of graphite powder, 5% of carbon black, 7.5% of cellulose, 30% of old material powder and the balance of silicon carbide powder by mass.
The bending strength of the roll bar in example 4 at room temperature was 315MPa, the bending strength at 1200 ℃ was 349MPa, the straightness was 0.3 ‰, and the density was 3.86kg/m 3 The porosity was 0.05%.
Example 5:
this embodiment differs from embodiment 2 only in that: the batching step comprises 3.2% of graphite powder, 4.5% of carbon black, 1.5% of cellulose, 10% of old material powder and the balance of silicon carbide powder by mass.
The bending strength of the roll bar of example 5 at room temperature was 320MPa, the bending strength at 1200 ℃ was 355MPa, the straightness was 0.2 ‰, and the density was 5.20kg/m 3 The porosity was 0.01%.
Example 6:
this embodiment differs from embodiment 2 only in that: and adding a proper amount of polyvinyl alcohol and water for 3 times in the wet mixing process, stirring for 40min each time, wherein the mass ratio of the polyvinyl alcohol to the water added for each time is 1.
The bending strength of the roll bar of example 6 at room temperature was 320MPa, the bending strength at 1200 ℃ was 350MPa, the straightness was 0.2 ‰, and the density was 4.05kg/m 3 The porosity was 0.03%.
Example 7:
this embodiment differs from embodiment 2 only in that: and adding a proper amount of polyvinyl alcohol and water for 3 times in the wet mixing process, stirring for 40min each time, wherein the mass ratio of the polyvinyl alcohol to the water added for each time is 1.
The bending strength of the finally obtained roll rod in the embodiment 7 at normal temperature is 315MPa, the bending strength at 1200 ℃ is 335MPa, the straightness is 0.5 per mill, and the density is 3.30kg/m 3 The porosity was 0.05%.
Example 8:
this embodiment differs from embodiment 6 only in that: in the reaction sintering process, si particles coated by carbon black are required to be laid on the upper surface of the silicon carbide roller rod, and the thickness of a carbon black coating layer of the Si particles coated with the carbon black is 0.2mm.
The bending strength of the finally obtained roll bar in example 8 at room temperature was 330MPa, the bending strength at 1200 ℃ was 350MPa, the straightness was 0.15 ‰, and the density was 3.62kg/m 3 The porosity was 0.05%.
Example 9:
this embodiment differs from embodiment 6 only in that: in the reaction sintering process, si particles coated by carbon black are required to be laid on the upper surface of the silicon carbide roller, and the thickness of a carbon black coating layer of the Si particles coated by the carbon black is 0.3mm.
The bending strength of the finally obtained roll bar in example 9 at room temperature was 310MPa, the bending strength at 1200 ℃ was 330MPa, the straightness was 0.7 ‰, and the density was 4.53kg/m 3 The porosity was 0.03%.
Comparative example 1:
this comparative example differs from example 3 only in that: the batching step comprises the step of mixing the old material powder with the mass fraction of 2%.
The properties of the finally obtained roll bar were also examined. The roll bar of comparative example 1 was measured to have a bending strength of 280mpa at room temperature, a bending strength of 250MPa at 1200 c, and a porosity of 0.5%.
Comparative example 2:
this comparative example differs from example 4 only in that: the batching step comprises 55% of old powder by mass.
The properties of the finally obtained roll bar were also examined. The roll bar of comparative example 2 was found to have a flexural strength of 220MPa at room temperature, a flexural strength of 180MPa at 1200 ℃ and a porosity of 0.8%.
Comparative example 3:
this comparative example differs from example 5 only in that: the batching step comprises 3.2% of graphite powder, 4.5% of carbon black, 1.5% of cellulose, 60% of old material powder and the balance of silicon carbide powder by mass.
The properties of the finally obtained roll bar were also examined. The roll bar of comparative example 3 was measured to have a bending strength of 200MPa at room temperature, a bending strength of 150MPa at 1200 ℃ and a porosity of 0.85%.
Comparative example 4:
this comparative example differs from example 8 only in that: the water content of the wet-mixed pug is 8%.
The properties of the finally obtained roll bar were also examined. The roll bar of comparative example 4 was found to have a low bending strength at both normal and high temperatures of 280MPa at normal temperature, 290MPa at 1200 ℃ and 0.8% o of straightness, with a density of 2.89kg/m 3 The porosity was 0.13%.
Comparative example 5:
this comparative example differs from example 8 only in that: and the water content of the wet-mixed pug is 20%.
The bending strength of the finally obtained roller rod in the comparative example 5 at normal temperature and high temperature is lower, and is similar to that of the comparative example 1, but the straightness is only 1.5 per mill, and the density is 2.75kg/m 3 The porosity was 0.2%.
Comparative example 6:
this comparative example differs from example 8 only in that: in the reaction sintering process, the thickness of the carbon black coating layer of the Si particles coated with the carbon black is 0.01mm. The bending strengths of the finally obtained roll bar in comparative example 6 at normal temperature and high temperature were measured to be 270MPa and 295MPa, respectively, and the strength was low. Measured straightness is 1.0 per mill, and density is 2.96kg/m 3 The porosity was 0.15%.
Comparative example 7:
this comparative example differs from example 8 only in that: in the reaction sintering process, the thickness of the carbon black coating layer of the Si particles coated with the carbon black is 0.5mm. The strength and straightness of the finally obtained roll bar were also measured. The bending strengths of the finally obtained roll bar in comparative example 7 at normal temperature and high temperature were measured to be 265MPa and 280MPa, respectively, and the strength was low. Measured straightness is 1.0 per mill, and density is 2.60kg/m 3 The porosity was 0.12%.
The silicon carbide roller rod is used as a transmission device of a lithium battery anode and cathode material sintering roller kiln, has good performance during use, does not have adverse conditions such as midway fracture and the like, and has long service life which can reach 3 years.
Claims (10)
1. The silicon carbide roller rod for roller kiln transmission is characterized in that the mass fraction of silicon carbide in the roller rod is more than or equal to 85%, and the density of the silicon carbide in the roller rod is more than or equal to 3.02kg/m 3 The porosity is less than 0.1%, and the bending strength at 1200 ℃ is 330 MPa-360 MPa.
2. The silicon carbide roller for the track roller kiln transmission according to claim 1, wherein the roller has a straightness of 0.1 to 0.8%.
3. A method for preparing the silicon carbide roller rod for the transmission of the roller kiln according to any one of claims 1 or 2, comprising the following steps: preparing materials, mixing materials, vacuum forming, drying, shaping, reacting and sintering, sand blasting, testing and packaging; the ingredients comprise 3-5% of graphite powder, 4-7% of carbon black, 1-8% of cellulose and the balance of silicon carbide powder by mass percentage;
the method is characterized in that: the ingredients also comprise 5 to 50 percent of old material powder;
the waste material powder is obtained by ball milling and crushing waste materials generated in the vacuum forming step, the waste material powder comprises 85-90% by mass of silicon carbide, graphite powder, carbon black and cellulose, and the D50 particle size of the waste material powder is 20-40 mu m.
4. The method for preparing the silicon carbide roller rod for the transmission of the roller kiln according to claim 3, which is characterized in that: in the step of compounding, the silicon carbide powder comprises: 8 to 12 parts of silicon carbide powder A with the grain diameter of 150 to 178 mu m, 8 to 12 parts of silicon carbide powder B with the grain diameter of 90 to 104 mu m, 16 to 20 parts of silicon carbide powder C with the grain diameter of 74 to 85 mu m, 16 to 20 parts of silicon carbide powder D with the grain diameter of 58 to 65 mu m and 18 to 22 parts of silicon carbide powder E with the grain diameter of 3 to 5 mu m.
5. The method for preparing the silicon carbide roller rod for the transmission of the roller kiln according to claim 4, which is characterized in that: the material mixing step comprises dry mixing and wet mixing, wherein the wet mixing time is 5-7 times of the dry mixing time, and the dry mixing time is 20-30 min; the dry mixing process comprises the steps of firstly stirring and mixing silicon carbide powder A, silicon carbide powder B and silicon carbide powder C to obtain a mixed material A, and stirring and mixing silicon carbide powder D and silicon carbide powder E to obtain a mixed material B; stirring and mixing the mixed material A and the mixed material B to obtain a mixed material C; and finally, stirring and mixing the mixed material C with graphite powder, carbon black, cellulose and the old material part in sequence to obtain a mixed material.
6. The method for preparing the silicon carbide roller rod for the transmission of the roller kiln according to claim 5, wherein a high-speed stirrer is used in the dry mixing process, the stirring speed is 1300-1500 r/min, and the bulk density of the mixture is 1.0-1.2 g/cm 3 。
7. The preparation method of the silicon carbide roller rod for the transmission of the roller kiln according to claim 6, wherein a stirring pot which is sealed by a cover is used in the wet mixing process, and the wet mixing process comprises the following specific steps: adding a proper amount of polyvinyl alcohol and water for 2-4 times, wherein the mass ratio of the polyvinyl alcohol to the water is (1-1.1); the stirring process adopts circulating water for cooling, so that the temperature of the stirring kettle is kept between 25 and 40 ℃, and the water content of the pug is 10 to 15 percent.
8. The method for preparing the silicon carbide roller rod for the transmission of the roller kiln according to claim 7, wherein the vacuum degree of the vacuum forming process is less than-0.085 Pa, the forming pressure is 3-12 MPa, the vacuum forming process also adopts circulating water cooling, so that the forming temperature is kept at 25-40 ℃, and both ends of the formed roller rod blank are inclined planes; the shaping process includes port cutting and puncturing.
9. The method for preparing the silicon carbide roller rod for the transmission of the roller kiln according to claim 8, which is characterized in that: si particles coated by carbon black are laid on the upper surface of the silicon carbide roller rod in the reaction sintering process, the carbon black is irregular particles with the purity of more than 99.5 percent and the size of 35-50 mu m, and the contents of Fe, al and Ca in the carbon black are not more than 0.3 percent, 0.1 percent and 0.05 percent; the Si particles are also irregular in shape and 1-3 cm in size; the thickness of the carbon black coating layer of the Si particles coated with the carbon black is 0.05-0.3 mm;
in the sand blasting step, irregular silicon carbide powder with the mass fraction of more than 98% is adopted for sand blasting, the size of the silicon carbide powder is 0.5-0.8 mm, and the spraying air pressure in the sand blasting step is 0.3-0.8 MPa.
10. Use of a silicon carbide roller bar for roller kiln transmission, characterized in that the silicon carbide roller bar according to any of claims 1 to 9 is used as a transmission device of a lithium battery anode and cathode material sintering roller kiln.
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| DE2549637A1 (en) * | 1974-11-11 | 1976-05-20 | Norton Co | HIGH DENSITY SILICON CARBIDE SHAPED BODY AND PROCESS FOR THEIR PRODUCTION |
| CN101081740A (en) * | 2007-04-24 | 2007-12-05 | 山东金鸿集团有限公司 | Process for production of reaction-sintered silicon carbide |
| CN105461306A (en) * | 2015-11-16 | 2016-04-06 | 石婷 | High-strength silicon carbide ceramic pipe and manufacturing method thereof |
| CN106116614A (en) * | 2016-06-30 | 2016-11-16 | 佛山市盈通黑金碳材料股份有限公司 | The preparation method of re-crystallized silicon carbide roller rod |
| CN113773094A (en) * | 2021-09-30 | 2021-12-10 | 中国航发北京航空材料研究院 | Method for treating silicon powder for melt siliconizing |
| CN114213131A (en) * | 2022-02-22 | 2022-03-22 | 鼎固新材料(天津)有限公司 | Silicon carbide roller material for roller kiln and preparation method thereof |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2549637A1 (en) * | 1974-11-11 | 1976-05-20 | Norton Co | HIGH DENSITY SILICON CARBIDE SHAPED BODY AND PROCESS FOR THEIR PRODUCTION |
| CN101081740A (en) * | 2007-04-24 | 2007-12-05 | 山东金鸿集团有限公司 | Process for production of reaction-sintered silicon carbide |
| CN105461306A (en) * | 2015-11-16 | 2016-04-06 | 石婷 | High-strength silicon carbide ceramic pipe and manufacturing method thereof |
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| CN113773094A (en) * | 2021-09-30 | 2021-12-10 | 中国航发北京航空材料研究院 | Method for treating silicon powder for melt siliconizing |
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