Ceramic thermal spray material and method of making same

Abstract

Disclosed is a ceramic thermal spray material and a method for manufacturing the same. The ceramic thermal spray material includes: a ceramic particle powder; and an organic compound that modifies a surface of the ceramic particle powder and contains stearic acid containing an ammonium group.

Description

Technical Field

[0001] This invention relates to a ceramic thermal spraying material and its manufacturing method. Background Technology

[0002] Thermal spraying, utilizing single or composite ceramic powders, is applied in a variety of fields. The thermal spraying market is segmented by many companies, and recently, the aerospace and automotive sectors have also seen an increasing demand for coatings. Particularly in the semiconductor component sector, the increasing sophistication of semiconductors necessitates coatings with high density and a certain degree of roughness.

[0003] The properties of ceramic materials used for coating also need to be diversified to meet the characteristics required by industry. When coating with ceramic powder particles of about 30 to 50 μm, it is necessary to ensure that the powder particles are smaller than about 30 μm to compensate for the increase in defects in the coating. When analyzing particle size in order to form a uniform film, it may be necessary to minimize the span value (D90-D10) / D50, which represents the width of the sample distribution.

[0004] In thermal spraying methods, a smooth and constant supply speed of the thermal spraying powder supply unit is required to form a uniform film and execute the process effectively. For uniform supply, powder agglomeration must be minimized to increase flowability. This is necessary not only for coating but also for improving the filling rate of the particulate powder used in the manufacture of sintered bodies. Therefore, research on ensuring the flowability of ceramic powders continues. When the particle size decreases to below approximately 30 μm, the increased surface energy between particles causes small particles to aggregate, thus reducing flowability. This not only reduces the process speed but also leads to blockage of the delivery pipe, reducing the feed rate and consequently lowering production efficiency.

[0005] Currently, plasma treatment is used to improve surface flowability. This method is not only expensive in terms of setup costs but also requires significant energy. Currently, a method using ordinary stearic acid for coating is emerging as an alternative to plasma treatment. However, when using ordinary stearic acid, uniform coating is impossible, and the process cannot be performed at room temperature. Furthermore, when the process is carried out at temperatures above approximately 60°C and ordinary stearic acid is used for coating, residues may remain, reducing flowability and leading to a tendency to aggregate. Therefore, there is a need to research surface treatment methods that can achieve sustained results through simple processes.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Korean Patent No. 10-2302317

[0009] Content of the invention

[0010] The problem the invention aims to solve

[0011] One object of the present invention is to provide a ceramic thermal spraying material with improved flowability and virtually no residue on the surface.

[0012] Another object of the present invention is to provide a method for manufacturing the ceramic thermal spraying material.

[0013] means for solving problems

[0014] To achieve the aforementioned objective, the present invention provides a ceramic thermal spraying material comprising: ceramic particle powder; and an organic compound that modifies the surface of the ceramic particle powder and contains stearic acid containing ammonium groups.

[0015] According to one embodiment of the present invention, the content of the organic compound can be from 0.1 to 5 by weight.

[0016] According to one embodiment of the present invention, the ceramic particle powder may contain elements selected from Y2O3, YF3, YSZ, YOF, Y4Al2O9, and Y3Al5O. 12 One or more of the groups formed with YAlO3.

[0017] According to one embodiment of the present invention, the ceramic particle powder can be an aggregate of raw material powder with a particle size greater than 0 and less than or equal to 1 μm.

[0018] According to one embodiment of the present invention, the median particle size D50 of the ceramic powder can be 5 to 25 μm.

[0019] According to one embodiment of the present invention, the particle size distribution span (D90-D10) / D50 of the ceramic particle powder can be from 0.5 to 4.

[0020] According to one embodiment of the present invention, the stearic acid containing ammonium groups can decompose at 200°C to 400°C.

[0021] Furthermore, the present invention provides a method for manufacturing a ceramic thermal spraying material, comprising the following steps: preparing ceramic particle powder; adding stearic acid containing ammonium groups and the ceramic particle powder to a first solvent to prepare a first mixed solution; evaporating the first solvent from the first mixed solution; and modifying the surface of the ceramic particle powder with an organic compound by evaporating the first solvent.

[0022] According to an embodiment of the present invention, the step of preparing the ceramic particle powder may include the following steps: spraying a composition containing ceramic raw material powder using a spray dryer to form an aggregate of the ceramic raw material powder; and heat-treating the aggregate at 800°C to 1400°C.

[0023] According to one embodiment of the present invention, in the step of adding stearic acid containing ammonium groups and the ceramic particle powder to the first solvent to prepare a first mixed solution, the molecular weight of the stearic acid containing ammonium groups can be 200 to 400 g / mol.

[0024] According to one embodiment of the present invention, in the step of evaporating the first solvent from the first mixed solution, a spray dryer can be used to evaporate the first solvent.

[0025] According to one embodiment of the present invention, the rotation speed of the spray dryer can be 6000 to 15000 RPM.

[0026] Furthermore, the present invention provides a method for manufacturing ceramic thermal spraying materials, comprising the following steps: preparing ceramic particle powder; adding stearic acid containing ammonium groups to a second solvent to prepare a second mixed solution; feeding the ceramic particle powder and the second mixed solution into a fluidized bed dryer; and modifying the surface of the ceramic particle powder using an organic compound in the fluidized bed dryer.

[0027] According to one embodiment of the present invention, in the step of feeding the ceramic particle powder and the second mixed solution into the fluidized bed dryer, the ceramic particle powder may be fed into the first feeder of the fluidized bed dryer, and the second mixed solution may be fed into the second feeder of the fluidized bed dryer.

[0028] The effects of the invention

[0029] According to the present invention, when comparing the same particulate powder produced under certain conditions before and after surface treatment, compared with the surface treatment, the increased density and decreased angle of repose due to improved filling rate result in improved flowability. Furthermore, it is expected that a sustained effect can be obtained through a simple process without the need for surface treatment methods such as plasma treatment. By improving flowability, uniform feeding can be achieved even with small particles, thereby obtaining the desired coating properties such as high density and roughness adjustment. Attached Figure Description

[0030] Figure 1 This is a flowchart illustrating a method for manufacturing a ceramic thermal spraying material according to an embodiment of the present invention.

[0031] Figure 2This is a schematic diagram of a method for manufacturing a ceramic thermal spraying material according to an embodiment of the present invention.

[0032] Figure 3 This is a flowchart illustrating a method for manufacturing a ceramic thermal spraying material according to another embodiment of the present invention.

[0033] Figure 4 The results are measured by a thermogravimetric analyzer (TGA, General Purpose v4.5a, TA instrument) for ceramic thermal spraying materials according to an embodiment of the present invention.

[0034] Figure 5 The spectrum is obtained from a Fourier transform infrared spectrometer of the ceramic thermal spraying material according to an embodiment of the present invention.

[0035] Figure 6 The result is the angle of repose measurement according to an embodiment of the present invention.

[0036] Figure 7 These are images obtained using a scanning electron microscope (SEM) according to embodiments of the present invention. Detailed Implementation

[0037] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention can be modified and implemented in various ways; therefore, specific embodiments are shown in the drawings and described in detail in this specification. However, it should be understood that this is not limited to specific embodiments, but rather encompasses all variations, equivalents, and even substitutions contained within the spirit and scope of the invention. Similar reference numerals are used for similar constituent elements in the description of the various drawings. In the drawings, for clarity of the invention, the dimensions of structures are shown enlarged compared to actual dimensions.

[0038] While terms such as "first" and "second" can be used to describe various constituent elements, the constituent elements are not limited to these terms. These terms are used only to distinguish one constituent element from others. For example, without departing from the scope of this invention, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element.

[0039] The terminology used in this application is for illustrative purposes only and is not intended to limit the invention. Unless the context clearly specifies otherwise, singular expressions include plural expressions. In this application, terms such as "comprising" or "having" are used to specify the presence of features, numbers, steps, actions, constituent elements, components, or combinations thereof described in the specification, and do not preclude the presence or additional possibilities of more than one other feature, number, step, action, constituent element, component, or combination thereof.

[0040] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art. Terms defined in commonly used dictionaries shall be interpreted as having the same meaning as in the context of the relevant art, and shall not be interpreted as having an ideal or overly formal meaning unless expressly defined in this application.

[0041] Figure 1 This is a flowchart illustrating a method for manufacturing a ceramic thermal spraying material according to an embodiment of the present invention.

[0042] Reference Figure 1 The method for manufacturing ceramic thermal spraying material according to an embodiment of the present invention may include: a first step S110 of preparing ceramic particle powder; a second step S120 of adding stearic acid containing ammonium groups and the ceramic particle powder to a first solvent to prepare a first mixed solution; a third step S130 of evaporating the first solvent from the first mixed solution; and a fourth step S140 of modifying the surface of the ceramic particle powder with an organic compound by evaporating the first solvent.

[0043] In the first step S110, the ceramic particle powder can be manufactured by: spraying a composition containing ceramic raw material powder using a spray dryer to form aggregates of the ceramic raw material powder; and heat-treating the aggregates at approximately 800°C to 1400°C. As an example, ceramic particle powder with a median particle size D50 of approximately 5 to 25 μm can be prepared by spraying a composition containing ceramic raw material powder with a particle size of approximately 1 μm or less using the spray dryer. The ceramic particle powder may contain materials selected from Y2O3, YF3, YSZ, YOF, Y4Al2O9, and Y3Al5O. 12 It may contain one or more of the following, but is not limited to, those in the group consisting of YAlO3. For example, Y2O3 may be used as the ceramic particle powder.

[0044] In the second step S120, the first solvent may include, but is not limited to, one or more of the group consisting of water, methanol, ethanol, toluene, and IPA. For example, ethanol may be used as the first solvent. As an example, the ammonium-containing stearic acid and the ceramic particle powder may be added to the first solvent at a weight ratio of about 1:100 to 250.

[0045] In the third step S130, the first solvent can be evaporated using a spray dryer, and the disc rotation speed of the spray dryer can be approximately 6000 to 15000 RPM. If the disc rotation speed of the spray dryer exceeds approximately 15000 RPM, the amount of particles colliding with the inner wall of the spray dryer chamber may increase. If the disc rotation speed of the spray dryer is less than approximately 6000 RPM, the drying time may increase.

[0046] In the fourth step S140, as Figure 2 As shown in the schematic diagram, stearic acid containing ammonium groups can be coated onto the surface of the ceramic particle powder while the first solvent evaporates.

[0047] Figure 3 This is a flowchart illustrating a method for manufacturing a ceramic thermal spraying material according to another embodiment of the present invention.

[0048] Reference Figure 3 A method for manufacturing a ceramic thermal spraying material according to another embodiment of the present invention may include: a fifth step S150 of preparing ceramic particle powder; a sixth step S160 of adding stearic acid containing ammonium groups to a second solvent to prepare a second mixed solution; a seventh step S170 of feeding the ceramic particle powder and the second mixed solution into a fluidized bed dryer; and an eighth step S180 of modifying the surface of the ceramic particle powder with an organic compound in the fluidized bed dryer.

[0049] In the fifth step S150, the ceramic particle powder can be manufactured by: spraying a composition containing ceramic raw material powder using a spray dryer to form aggregates of the ceramic raw material powder; and heat-treating the aggregates at approximately 800°C to 1400°C. As an example, ceramic particle powder with a median particle size D50 of approximately 5 to 25 μm can be prepared by spraying a composition containing ceramic raw material powder with a particle size of approximately 1 μm or less using the spray dryer. The ceramic particle powder may contain materials selected from Y₂O₃, YF₃, YS₂, YOF, Y₄Al₂O₉, and Y₃Al₅O₂. 12 It may contain one or more of the following, but is not limited to, those in the group consisting of YAlO3. For example, Y2O3 may be used as the ceramic particle powder.

[0050] In the sixth step S160, the molecular weight of the stearic acid containing the ammonium group can be about 200 to 400 g / mol, but is not limited thereto.

[0051] In one embodiment, the second solvent may include and use one or more selected from the group consisting of water, methanol, ethanol, toluene, and IPA. For example, ethanol may be used as the second solvent. As one embodiment, the ammonium-containing stearic acid and the ceramic particle powder may be added to the first solvent at a weight ratio of about 1:100 to 250.

[0052] In the seventh step S170, the ceramic powder particles can be fed into the first feeder of the fluidized bed dryer, and the second mixed solution can be fed into the second feeder of the fluidized bed dryer. The first feeder can be a top feeder, and the second feeder can be a bottom feeder.

[0053] In the eighth step S180, an organic compound can be coated onto the surface of the ceramic particle powder while the second mixed solution is being fed into the second feeder.

[0054] The ceramic thermal spraying material according to the present invention can be manufactured by the manufacturing method described above, and may include: ceramic particulate powder; and an organic compound that modifies the surface of the ceramic particulate powder and contains stearic acid containing ammonium groups.

[0055] In one embodiment, the content of the organic compound may be from about 0.1 to 5 by weight, based on the weight of the ceramic powder particles. If the weight ratio of the organic compound is less than about 0.1 by weight, it may not be possible to uniformly modify the surface of the ceramic powder particles using the organic compound. If the weight ratio of the organic compound exceeds about 5 by weight, the ceramic powder particles may become excessively aggregated due to the organic compound.

[0056] In one embodiment, the ceramic particle powder may include materials selected from Y2O3, YF3, YSZ, YOF, Y4Al2O9, and Y3Al5O. 12 It may contain one or more of YAlO3, but is not limited to them. For example, Y2O3 can be used as the ceramic particle powder.

[0057] In one embodiment, the ceramic particle powder may be an aggregate of raw material powder with a particle size greater than 0 and less than or equal to 1 μm. If the size of the raw material powder exceeds about 1 μm, the roughness value of the ceramic particle powder may increase.

[0058] In one embodiment, the median particle size D50 of the ceramic powder can be about 5 to 25 μm, and the particle size distribution span (D90-D10) / D50 of the ceramic powder can be about 0.5 to 4. If the particle size distribution span of the ceramic powder exceeds about 4, a uniform film may not be formed during thermal spraying.

[0059] In the following description, embodiments will be detailed to aid in understanding the invention. However, the following embodiments are merely illustrative of the invention, and the scope of the invention is not limited to the embodiments described below. The embodiments of the invention are provided to more fully explain the invention to those skilled in the art.

[0060] Example 1

[0061] Y₂O₃ was screened to have an average particle size of less than approximately 20 μm and then heat-treated at approximately 800 to 1400 °C for preparation. Stearic acid containing ammonium groups (approximately 2.5 g, approximately 0.5% by weight) and the Y₂O₃- (approximately 500 g) were added to ethanol (approximately 380 ml) and stirred to prepare a first mixed solution. To evaporate the solvent from the first mixed solution, it was fed into a spray dryer. The disc speed of the spray dryer was set to approximately 6000 to 15000 RPM. Inside the spray dryer, Y₂O₃ was coated with an organic compound to produce a ceramic thermal spray material.

[0062] Example 2

[0063] Except for the use of about 5g (about 1% by weight) of the ammonium-containing stearic acid in Example 1, the ceramic thermal spraying material was manufactured in the same manner as in Example 1.

[0064] Example 3

[0065] Except for the use of about 10g (about 2% by weight) of the ammonium-containing stearic acid in Example 1, the ceramic thermal spraying material was manufactured in the same manner as in Example 1.

[0066] Example 4

[0067] Except for the use of about 25g (about 5% by weight) of the ammonium-containing stearic acid in Example 1, the ceramic thermal spraying material was manufactured in the same manner as in Example 1.

[0068] Example 5

[0069] Y₂O₃ was screened to have an average particle size of less than approximately 20 μm and then heat-treated at approximately 800°C to 1400°C for preparation. A second mixed solution was prepared by adding approximately 2.5 g (approximately 0.5% by weight) of ammonium-containing stearic acid to approximately 380 ml of ethanol and stirring. This second mixed solution was fed into the bottom feeder of a fluidized bed dryer, and approximately 500 g of the Y₂O₃ was fed into the top feeder of the same dryer. The Y₂O₃ was then coated with an organic compound using the fluidized bed dryer to produce a ceramic thermal spray material.

[0070] Comparative Example 1

[0071] Commonly used Y2O3 was prepared.

[0072] Comparative Example 2

[0073] Except that ordinary stearic acid (about 10g) was used instead of stearic acid containing ammonium groups in Example 1 and the temperature of the spray dryer was set to about 90°C, the product was manufactured in the same manner as in Example 1.

[0074] Comparative Example 3

[0075] Except for the use of about 30g (about 6% by weight) of the ammonium-containing stearic acid in Example 1, the ceramic thermal spraying material was manufactured in the same manner as in Example 1.

[0076] Comparative Example 4

[0077] Except for the use of about 35g (about 7% by weight) of the ammonium-containing stearic acid in Example 1, the ceramic thermal spray material was manufactured in the same manner as in Example 1.

[0078] Experimental Example 1

[0079] Table 1 below summarizes the density and angle of repose of Examples 3 and 5 to confirm the differences in physical properties caused by different manufacturing equipment for ceramic thermal spray materials. Density and angle of repose were measured using ASTM D6393-08. The powder was dropped from a funnel of approximately 6 to 8 mm and placed into a container of a certain volume (approximately 25 ml). The apparent density was measured, and the dropped powder was piled onto a disc to measure the angle of repose at which stability was achieved. Table 1 shows that Example 3 was manufactured using a spray dryer, and Example 5 was manufactured using a fluidized bed dryer. Despite the different manufacturing equipment, ceramic thermal spray materials with very similar physical properties were produced.

[0080] [Table 1]

[0081] Example 3 Example 5 <![CDATA[Density (g / cm 3 )]]> 1.57 1.51 Angle of repose (°) 28.78 29.02

[0082] Table 2 below summarizes the densities and angles of repose of Examples 1 to 4, Comparative Examples 1, 3, and 4 to confirm the changes in physical properties caused by different addition ratios of stearic acid containing ammonium groups. Measurements showed that the angle of repose for the comparative examples was 35° or higher, while that for Examples 1 to 4 was 35° or lower. The angles of repose confirmed that Examples 1 to 4 exhibited excellent flowability. This confirms that when the addition content of stearic acid containing ammonium groups is approximately 0.1 to 5% by weight, the ammonium groups form particulate powder, thereby improving flowability.

[0083] [Table 2]

[0084]

[0085] Figure 4 The measurements were taken using a thermogravimetric analyzer (TGA, General Electric v4.5a, TA instrument) for the ceramic thermal spraying material according to an embodiment of the present invention. Weight changes were analyzed from approximately 30°C to 800°C. Comparative Example 1 showed almost no mass change within the measurement temperature range. In Example 3, a slight weight change of approximately 0.3% was observed at approximately 285°C. This was caused by the presence of ammonium-containing stearic acid, which has been confirmed to decompose after approximately 350°C.

[0086] Figure 5 The spectrum of the ceramic thermal spraying material according to an embodiment of the present invention was obtained using a Fourier transform infrared spectrometer (VERTEX 70V). Measurements were taken in the wavelength range of approximately 368 to 4000 nm. In Example 3, measurements were taken in the range of approximately 2800 to 3000 cm⁻¹. -1 Approximately 1200 to 1800 cm -1 A slightly more distinct peak was observed compared to Comparative Example 1. This peak was associated with an organic compound, and the presence of an organic compound in Example 3 was confirmed by Fourier transform infrared spectroscopy.

[0087] Figure 6 The results show the angle of repose measurement of the ceramic thermal spraying material according to embodiments of the present invention. It was confirmed that the angle of repose in Comparative Example 1 was approximately 41.07°, the angle of repose in Comparative Example 2 was approximately 38.8°, and the angle of repose in Example 3 was approximately 28.78°. The angle of repose in Example 3 was less than 35°, indicating excellent flowability. It was determined that in Comparative Example 2, a general stearic acid without ammonium groups was used, making it difficult for the powder to aggregate and form particulate powder, thus resulting in a high angle of repose. It was confirmed that the apparent density of Comparative Example 1 was approximately 1.272 g / cm³. 3 The apparent density of Comparative Example 2 was approximately 1.37 g / cm³. 3 The apparent density of Example 3 was approximately 1.57 g / cm³. 3Apparent density is the fill rate based on flowability; therefore, it is predicted that the fill rate of Example 3 will be higher than that of Comparative Examples 1 and 2.

[0088] Figure 7 These are scanning electron microscope (SEM) images (JEOL Ltd., JSM-7500F, JSM-IT200) of the ceramic thermal spraying material according to embodiments of the present invention. It was confirmed that Comparative Example 1 had a particle size of approximately 24 μm, and Example 1 had a particle size of approximately 28 μm. Therefore, it was confirmed that Example 3 had a particle size of approximately 30 μm or less. It was observed that some organic compounds on the surface of Comparative Example 2 were uneven; however, in Example 3, it was confirmed that there were almost no residues on its surface. Therefore, it is predicted that compared to Comparative Example 2, Example 3 has improved flowability and reduced aggregation tendency.

[0089] Table 3 below summarizes the physical properties according to embodiments of the present invention. Porosity was analyzed using ImagePro Plus (MediaCybernetics) as image analysis software, hardness was measured using a hardness tester (Mitutoyo, HM810-124K), and roughness was measured using a surface roughness meter (Mitutoyo, SJ-210). In Example 3, due to the organic compound, the porosity and roughness values ​​were reduced compared to Comparative Example 2, and the hardness was increased compared to Comparative Example 2. This confirms that the organic compound improves the physical properties of existing ceramic coating materials.

[0090] [Table 3]

[0091] unit Comparative Example 2 Example 3 Porosity ％ 3 to 6 Less than 1.0 hardness Hv 400 to 450 500 to 600 roughness μm 4.6 to 5.3 2.6 to 3.2

[0092] Although the invention has been described above with reference to preferred embodiments, those skilled in the art will understand that various modifications and alterations can be made to the invention without departing from the spirit and scope of the invention as set forth in the appended claims.

Claims

1. A ceramic thermal spraying material, wherein, include: Ceramic particles and powder; as well as Organic compounds are used to modify the surface of the ceramic powder particles. The organic compound contains stearic acid, which contains an ammonium group. The content of the stearic acid containing an ammonium group is 0.1% to 5% by weight. The stearic acid containing ammonium groups decomposes at 200°C to 400°C.

2. The ceramic thermal spraying material according to claim 1, wherein, The ceramic powder particles contain a subset selected from Y2O3, YF3, YSZ, YOF, Y4Al2O9, and Y3Al5O. 12 One or more of the groups formed with YAlO3.

3. The ceramic thermal spraying material according to claim 2, wherein, The ceramic particle powder is an aggregate of raw material powder with a particle size greater than 0 and less than or equal to 1 μm.

4. The ceramic thermal spraying material according to claim 3, wherein, The median particle size D50 of the ceramic powder is 5 to 25 μm.

5. The ceramic thermal spraying material according to claim 4, wherein, The particle size distribution range (D90-D10) / D50 of the ceramic powder is 0.5 to 4.

6. A method for manufacturing a ceramic thermal spraying material, wherein, Includes the following steps: Prepare ceramic granule powder; 0.1 to 5% by weight of stearic acid containing ammonium groups and the ceramic particle powder are added to a first solvent to prepare a first mixed solution; The first solvent is evaporated from the first mixed solution; as well as The surface of the ceramic particle powder is modified using organic compounds by evaporating the first solvent. The stearic acid containing ammonium groups decomposes at 200°C to 400°C.

7. The method for manufacturing ceramic thermal spraying material according to claim 6, wherein, The steps for preparing the ceramic particle powder include the following: Using a spray dryer to spray a composition containing ceramic raw material powder to form aggregates of the ceramic raw material powder; and The aggregate is heat-treated at 800°C to 1400°C.

8. The method for manufacturing ceramic thermal spraying material according to claim 6, wherein, In the step of adding stearic acid containing ammonium groups and the ceramic particle powder to a first solvent to prepare a first mixed solution, The stearic acid containing ammonium groups has a molecular weight of 200 to 400 g / mol.

9. The method for manufacturing ceramic thermal spraying material according to claim 6, wherein, In the step of evaporating the first solvent from the first mixed solution, a spray dryer is used to evaporate the first solvent.

10. The method for manufacturing ceramic thermal spraying material according to claim 9, wherein, The rotation speed of the spray dryer is 6000 to 15000 RPM.

11. A method for manufacturing a ceramic thermal spraying material, wherein, Includes the following steps: Prepare ceramic granule powder; 0.1 to 5% by weight of stearic acid containing ammonium groups is added to the second solvent to prepare the second mixed solution; The ceramic particle powder and the second mixed solution are fed into a fluidized bed dryer; as well as In the fluidized bed dryer, organic compounds are used to modify the surface of the ceramic particle powder. The stearic acid containing ammonium groups decomposes at 200°C to 400°C.

12. The method for manufacturing ceramic thermal spraying material according to claim 11, wherein, In the step of feeding the ceramic particle powder and the second mixed solution into the fluidized bed dryer, the ceramic particle powder is fed into the first feeder of the fluidized bed dryer, and the second mixed solution is fed into the second feeder of the fluidized bed dryer.

Images