Plasma spraying deposition powder feeding device, powder feeding method and deposition equipment

Abstract

The invention provides a plasma spraying deposition powder feeding device, a powder feeding method and deposition equipment. The plasma spraying deposition powder feeding device comprises a powder injection pipeline and a spray gun, the spray gun is used for spraying plasma, and the powder injection pipeline is provided with a discharging port facing the spraying path of the spray gun. The powder injection pipeline comprises a first bending section and a second bending section which are sequentially arranged, the first bending section is provided with a first bending starting end and a first bending tail end, the second bending section is provided with a second bending starting end and a second bending tail end, the pipeline axial direction of the first bending starting end intersects with the pipeline axial direction of the first bending tail end, and the pipeline axial direction of the second bending tail end intersects with the pipeline axial direction of the second bending tail end. And the axial direction of the pipeline at the initial end of the second bend intersects with the axial direction of the pipeline at the tail end of the second bend. Compared with the straight pipe design in the traditional technology, the plasma spraying deposition powder feeding device can skillfully improve the powder material crushing capacity by transforming the structure of the pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of vapor deposition, and in particular to a plasma spray deposition powder feeding device, a powder feeding method and a deposition equipment. Background Art

[0002] Plasma Spray Physical Vapor Deposition (PS-PVD) heats the material to a molten or evaporated state through high-temperature plasma, and then sprays it onto the surface of the substrate to form a solid coating. It is a technology that combines the advantages of traditional atmospheric plasma spraying (APS) and electron beam physical vapor deposition (EB-PVD). Plasma physical vapor deposition technology is developed on the basis of low-pressure plasma spraying by further reducing the vacuum chamber pressure and greatly increasing the power of the plasma spray gun. It can use gas phase, liquid phase, and solid phase as deposition units to prepare coatings. By adjusting the gas phase / liquid phase / solid phase multiphase ratio, coatings with different organizational structures can be deposited. When gas phase deposition is mainly used, the quasi-columnar structure coating deposited has excellent thermal insulation performance and high thermal cycling performance.

[0003] Plasma spray physical vapor deposition technology uses powder materials as deposition raw materials. Plasma spray physical vapor deposition equipment adopts an internal powder feeding method, usually including a powder feeder, a powder feeding pipeline and a spray gun. The powder feeder is used to input the powder material into the powder feeding pipeline and finally enter the spray gun. After the powder material is sprayed out by the spray gun, it is gasified under the action of the plasma jet. At present, agglomerated powder materials formed by the combination of multiple original particles are usually used as raw materials. Compared with single original particles, agglomerated powder materials are easier to enter the plasma jet during the powder feeding process, and agglomerated powder materials can be broken into original particles and gasified in the spray gun and plasma jet. The larger the overall particle size of the agglomerated powder material, the better its fluidity. However, larger agglomerated powder materials are more difficult to crush and have poor gasification performance. Summary of the invention

[0004] Based on this, it is necessary to provide a plasma spray deposition powder feeding device that can improve the crushing ability of powder materials in order to address the problems in the above-mentioned background technology.

[0005] The present invention provides a plasma spray deposition powder feeding device, which comprises a powder injection pipeline and a spray gun, wherein the spray gun is used to spray plasma, and the powder injection pipeline has a discharge port on a spray path facing the spray gun;

[0006] The powder injection pipeline includes a first bending section and a second bending section which are arranged in sequence, the first bending section has a first bending start end and a first bending end end, the second bending section has a second bending start end and a second bending end end, the pipeline axial direction at the first bending start end intersects with the pipeline axial direction at the first bending end, and the pipeline axial direction at the second bending start end intersects with the pipeline axial direction at the second bending end.

[0007] In some embodiments of the present invention, the axial direction of the pipe at the end of the first bend is the same as the axial direction of the pipe at the beginning of the second bend.

[0008] In some embodiments of the present invention, the axial direction of the pipe at the beginning of the first bend is parallel to the axial direction of the pipe at the end of the second bend.

[0009] In some embodiments of the present invention, the bending angle of the powder injection pipe at the first bending section is 45° to 90°; and / or,

[0010] The bending angle of the powder injection pipe at the second bending section is 45°~90°.

[0011] In some embodiments of the present invention, the axis of the first bending section is in a smooth curve; and / or,

[0012] The axis of the second bending section is in a smooth curve shape.

[0013] In some embodiments of the present invention, the inner side of the first bending section is in an arc shape with a radius of 20 mm to 50 mm, and the pipe diameter of the first bending section is 3 mm to 6 mm; and / or,

[0014] The inner side of the second bending section is in an arc shape with a radius of 20 mm to 50 mm, and the pipe diameter of the second bending section is 3 mm to 6 mm.

[0015] Furthermore, the present invention also provides a plasma spray deposition powder feeding method, which comprises the following steps:

[0016] Using the plasma spray deposition powder feeding device as described in any of the above embodiments to feed agglomerated powder material into the powder injection pipeline;

[0017] The powder material is made to pass through the first bending section and the second bending section and then be ejected from the discharge port, and the spray gun is used to spray plasma toward the agglomerated powder material.

[0018] In some embodiments of the present invention, the D50 particle size of the agglomerated powder material is 20 μm to 25 μm.

[0019] In some embodiments of the present invention, the agglomerated powder material includes primary particles and a binder, and the mass proportion of the binder in the agglomerated powder material is 0.5% to 2%.

[0020] In some embodiments of the present invention, the preparation method of the agglomerated powder material comprises the following steps:

[0021] The raw material and the binder are mixed and dispersed in a solvent to obtain a mixed material, wherein the solid content of the mixed material is 15% to 40%;

[0022] The mixed material is subjected to a spray granulation treatment. During the spray granulation treatment, the pressure of the compressed gas in the atomizer is controlled to be 0.2MPa~0.6MPa, the inlet temperature of the atomizer is controlled to be 210℃~270℃, and the outlet temperature of the atomizer is controlled to be 110℃~120℃.

[0023] Furthermore, the present invention also provides a plasma spray deposition device, which includes a deposition chamber and a plasma spray deposition powder feeding device as described in any of the above embodiments, wherein the spray gun in the plasma spray deposition powder feeding device is arranged in the deposition chamber.

[0024] The plasma spray deposition powder feeding device of the present invention comprises a powder injection pipeline and a spray gun, wherein the spray gun is used to spray plasma. The powder injection pipeline comprises a first bending section and a second bending section arranged in sequence, the first bending section has a first bending start and a first bending end, the second bending section has a second bending start and a second bending end, the pipeline axial direction of the first bending start intersects with the pipeline axial direction of the first bending end, and the pipeline axial direction of the second bending start intersects with the pipeline axial direction of the second bending end. When the powder material passes through the powder injection pipeline, by setting the first bending section and the second bending section, the axial direction of the pipeline can be changed twice, so that a more violent collision occurs between the powder material and the powder injection pipeline, so that the powder material is pre-crushed and split in the pipeline. The particle size of the crushed powder material is relatively small, and it is easier to be further crushed and gasified under the action of plasma after being ejected from the discharge port. Therefore, compared with the straight pipe design in the conventional technology, the plasma spray deposition powder feeding device of the present invention can cleverly improve its ability to crush powder materials by modifying the structure of the pipeline.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a structural schematic diagram of a powder injection pipeline;

[0028] Figure 2 It is a structural schematic diagram of another powder injection pipeline;

[0029] Figure 3 It is a structural schematic diagram of another powder injection pipeline;

[0030] Figure 4 This is a schematic diagram of the structure of the agglomerated powder prepared in Example 1;

[0031] Figure 5 This is a schematic diagram of the structure of the agglomerated powder prepared in Example 2.

[0032] The reference numerals and their meanings are as follows:

[0033] 110, first bending section; 111, first bending start; 112, first bending end; 120, second bending section; 121, second bending start; 122, second bending end; 130, transition section; 210, first bending section; 211, first bending start; 212, first bending end; 220, second bending section; 221, second bending start; 222, second bending end; 230, transition section; 310, first bending section; 311, first bending start; 312, first bending end; 320, second bending section; 321, second bending start; 322, second bending end. DETAILED DESCRIPTION

[0034] To facilitate understanding of the present invention, a more comprehensive description of the present invention is provided below. The preferred embodiments of the present invention are given herein. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the content of the present invention more thorough and comprehensive.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this document pertains. The terms used herein in the specification of this document are only for describing specific embodiments and are not intended to limit this document.

[0036] It should be understood that when an element or layer is referred to as being "on, "adjacent to, "connected to, or "coupled to" another element or layer, it may be directly on, adjacent to, connected to, or coupled to the other element or layer, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, "directly adjacent to, "directly connected to, or "directly coupled to" another element or layer, there may be no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion.

[0037] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of one element or feature to other elements or features. It should be understood that the spatially relative terms are intended to also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "over" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used may be interpreted accordingly.

[0038] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be a limitation of the present disclosure. When used herein, the singular forms "a", "an" and "the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0039] The present invention provides a plasma spray deposition powder feeding device, which comprises a powder injection pipeline and a spray gun, the spray gun is used for spraying plasma, and the powder injection pipeline has a discharge port on a spray path facing the spray gun. The powder injection pipeline comprises a first bending section and a second bending section arranged in sequence, the first bending section has a first bending start end and a first bending end end, the second bending section has a second bending start end and a second bending end end, the pipeline axial direction at the first bending start end intersects with the pipeline axial direction at the first bending end end, and the pipeline axial direction at the second bending start end intersects with the pipeline axial direction at the second bending end end.

[0040] The plasma spray deposition powder feeding device of the present invention comprises a powder injection pipeline and a spray gun, wherein the spray gun is used to spray plasma. The powder injection pipeline comprises a first bending section and a second bending section arranged in sequence, the first bending section has a first bending start and a first bending end, the second bending section has a second bending start and a second bending end, the pipeline axial direction of the first bending start intersects with the pipeline axial direction of the first bending end, and the pipeline axial direction of the second bending start intersects with the pipeline axial direction of the second bending end. When the powder material passes through the powder injection pipeline, by setting the first bending section and the second bending section, the axial direction of the pipeline can be changed twice, so that a more violent collision occurs between the powder material and the powder injection pipeline, so that the powder material is pre-crushed and split in the pipeline. The particle size of the crushed powder material is relatively small, and it is easier to be further crushed and gasified under the action of plasma after being ejected from the discharge port. Therefore, compared with the straight pipe design in the conventional technology, the plasma spray deposition powder feeding device of the present invention can cleverly improve its ability to crush powder materials by modifying the structure of the pipeline.

[0041] Figure 1 The schematic diagram of the structure of a powder injection pipeline is shown in FIG. The plasma spray deposition powder feeding device of the present invention may include a spray gun and a Figure 1 The powder injection pipeline shown, wherein the spray gun is used to spray plasma, has a discharge port on the spray path facing the spray gun.

[0042] In some examples of this embodiment, the plasma spray deposition powder feeding device of the present invention may further include a powder feeder, which is connected to the powder injection pipeline and is used to transport the powder material into the powder injection pipeline.

[0043] Reference Figure 1 As shown, in this embodiment, the powder injection pipeline includes a first bending section 110 and a second bending section 120 arranged in sequence, the first bending section 110 has a first bending start end 111 and a first bending end 112, the second bending section 120 has a second bending start end 121 and a second bending end 122, the pipeline axial direction of the first bending start end 111 intersects with the pipeline axial direction of the first bending end 112, and the pipeline axial direction of the second bending start end 121 intersects with the pipeline axial direction of the second bending end 122.

[0044] It can be understood that the powder injection pipe has an axial direction, and for a straight pipe, the axial direction is fixed. Figure 1 In the powder injection pipe shown, the axial direction of the pipe changes at the first bending section 110, so that the axial direction of the pipe at the first bending start end 111 intersects with the axial direction of the pipe at the first bending end 112. The axial direction of the pipe also changes at the second bending section 120, so that the axial direction of the pipe at the second bending start end 121 intersects with the axial direction of the pipe at the second bending end 122.

[0045] In actual use, the powder material can move in the powder injection pipe with the air flow. The axial direction of the powder injection pipe before the first bending section 110 remains fixed, so the powder material moves stably along the axial direction. When passing through the first bending section 110 and the second bending section 120, due to the two consecutive changes in the axial direction of the pipe, the movement path of the powder material deviates from the axial direction of the pipe and collides with the wall of the powder injection pipe multiple times. During the collision, the part with poor bonding force will be broken first, which can reduce the particle size of the powder material in the pipe without the need for additional equipment.

[0046] Reference Figure 1 As shown, in this embodiment, only two bending sections are provided in the powder injection pipeline. In some other examples, the powder injection pipeline may also include more bending sections. However, too many bending sections will also cause too many collisions between the powder material and the pipe wall, resulting in a significant reduction in its fluidity, which is not conducive to its ejection.

[0047] Reference Figure 1 As shown, in some examples of this embodiment, the pipeline axial direction of the first bending end 112 is the same as the pipeline axial direction of the second bending start 121. The pipeline axial direction of the first bending end 112 is designed to be the same as the pipeline axial direction of the second bending start 121, so that the powder material can enter the second bending part from the first bending part more smoothly, and the fluidity of the powder material is kept relatively good.

[0048] Reference Figure 1 As shown, in some examples of this embodiment, the pipeline axis of the first bend start end 111 is parallel to the pipeline axis of the second bend end 122. Setting the pipeline axis of the first bend start end 111 and the pipeline axis of the second bend end 122 to be parallel to each other can also reduce the energy loss when the powder material collides with the pipe wall as much as possible, and further maintain the relatively good fluidity of the powder material.

[0049] Reference Figure 1 As shown, in some examples of this embodiment, in the powder injection pipe, the pipe axial direction of the portion of the powder injection pipe located before the first bending start end 111 remains fixed and is the same as the pipe axial direction of the first bending start end 111.

[0050] Reference Figure 1 As shown, in some examples of this embodiment, in the powder injection pipe, the pipe axial direction of the portion of the powder injection pipe located after the second bent end 122 is also kept fixed and is the same as the pipe axial direction of the second bent end 122 .

[0051] Reference Figure 1As shown, in some examples of this embodiment, the bending angle of the powder injection pipe at the first bending section 110 is 45° to 90°. The bending angle refers to the angle between the pipe axis at the first bending start end 111 and the pipe axis at the first bending end 112. By setting the bending angle to 45° to 90°, the powder material passing therethrough can be more effectively crushed, and the powder material also has good fluidity.

[0052] In some examples of this embodiment, the bending angle of the powder injection pipe at the first bending section 110 may be 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°. Alternatively, the bending angle of the powder injection pipe at the first bending section 110 may also be in the range between any two of the above bending angles.

[0053] Reference Figure 1 As shown, in some examples of this embodiment, the bending angle of the powder injection pipe at the second bending section 120 is 45°~90°, where the bending angle refers to the angle between the pipe axial direction at the second bending starting end 121 and the pipe axial direction at the second bending end 122.

[0054] In some examples of this embodiment, the bending angle of the powder injection pipe at the second bending section 120 may be 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°. Alternatively, the bending angle of the powder injection pipe at the second bending section 120 may also be in the range between any two of the above bending angles.

[0055] In some examples of this embodiment, the axis of the first bending section 110 may be in a smooth curve shape. For example, the axis of the first bending section 110 may be in an arc shape.

[0056] In some examples of this embodiment, the axis of the second bending section 120 may be in a smooth curve shape. For example, the axis of the second bending section 120 may be in an arc shape.

[0057] By setting the axis of the first bending section 110 and the axis of the second bending section 120 to be in a smooth curve shape, it can be ensured that the powder material can continue to move forward after the first bending section 110 and the second bending section 120 collide with the pipe wall, so that the powder material can maintain a high flow rate.

[0058] It can be understood that, since the axis of the first bending section 110 is curved, the first bending section 110 has an inner side located inside the axis and an outer side located outside the axis, wherein the length of the inner side is shorter than the length of the outer side. In some examples of this embodiment, the inner side of the first bending section 110 is in the shape of an arc with a radius of 20 mm to 50 mm. For example, the radius of the inner side of the first bending section 110 can be 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, or the radius of the inner side of the first bending section 110 can also be between any two of the above radii.

[0059] In some examples of this embodiment, the pipe diameter of the first bending section 110 is 3 mm to 6 mm. For example, the pipe diameter of the first bending section 110 is 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, or the pipe diameter of the first bending section 110 can also be between any two of the above diameters.

[0060] It can be understood that, since the axis of the second bending section 120 is curved, the second bending section 120 has an inner side located inside the axis and an outer side located outside the axis, wherein the length of the inner side is shorter than the length of the outer side. In some examples of this embodiment, the inner side of the second bending section 120 is in the shape of an arc with a radius of 20 mm to 50 mm. For example, the radius of the inner side of the second bending section 120 can be 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, or the radius of the inner side of the second bending section 120 can also be between any two of the above radii.

[0061] In some examples of this embodiment, the pipe diameter of the second bending section 120 is 3 mm to 6 mm. For example, the pipe diameter of the second bending section 120 is 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, or the pipe diameter of the second bending section 120 can also be between any two of the above diameters.

[0062] In such Figure 1 In the example shown, the pipe axis at the first bend head end is parallel to the pipe axis at the second bend end 122. And along the direction from the first bend section 110 to the second bend section 120, the pipe axis at the first bend head end is the same as the pipe axis at the second bend end 122. Figure 1 In the orientation shown, the axial direction of the pipe at the first bend head end and the axial direction of the pipe at the second bend end 122 are both to the right.

[0063] In such Figure 1In the example shown, the first bending end 112 is spaced from the second bending start 121. The powder injection pipe also includes a transition section 130 between the first bending end 112 and the second bending start 121, and the transition section 130 may be straight to keep the pipe axial direction unchanged. It is understood that in other examples, the first bending end 112 may be directly connected to the second bending start 121, that is, the first bending section 110 is directly connected to the second bending section 120, and the junction between the first bending section 110 and the second bending section 120 serves as both the first bending end 112 and the second bending start 121.

[0064] Figure 2 This is a schematic diagram of the structure of another powder injection pipeline. Figure 2 As shown, the powder injection pipe includes a first bending section 210 and a second bending section 220 arranged in sequence, the first bending section 210 has a first bending start end 211 and a first bending end 212, the second bending section 220 has a second bending start end 221 and a second bending end 222, the pipe axial direction of the first bending start end 211 intersects with the pipe axial direction of the first bending end 212, and the pipe axial direction of the second bending start end 221 intersects with the pipe axial direction of the second bending end 222.

[0065] In such Figure 2 In the example shown, the pipe axis at the first bend head end is parallel to the pipe axis at the second bend end 222. And along the direction from the first bend section 210 to the second bend section 220, the pipe axis at the first bend head end is opposite to the pipe axis at the second bend end 222. Figure 2 In the orientation shown, the pipe at the first bend head end is axially to the right, while the pipe at the second bend end 222 is axially to the left.

[0066] In such Figure 2 In the example shown, the first bending end 212 is spaced from the second bending start 221. The powder injection pipe also includes a transition section 230 between the first bending end 212 and the second bending start 221, and the transition section 230 can be straight to keep the pipe axial direction unchanged. It can be understood that in other examples, the first bending end 212 can be directly connected to the second bending start 221, that is, the first bending section 210 is directly connected to the second bending section 220, and the junction between the first bending section 210 and the second bending section 220 serves as both the first bending end 212 and the second bending start 221.

[0067] Figure 2 The powder injection pipeline shown is Figure 1 The main difference between the powder injection pipes shown is the orientation design of the first bending section 210 and the second bending section 220. Other structural parameters can be referred to Figure 1The corresponding structural parameters in the powder injection pipeline are shown.

[0068] Figure 3 This is a schematic diagram of the structure of another powder injection pipeline. Figure 3 As shown, the powder injection pipe includes a first bending section 310 and a second bending section 320 arranged in sequence, the first bending section 310 has a first bending start end 311 and a first bending end 312, the second bending section 320 has a second bending start end 321 and a second bending end 322, the pipe axial direction of the first bending start end 311 intersects with the pipe axial direction of the first bending end 312, and the pipe axial direction of the second bending start end 321 intersects with the pipe axial direction of the second bending end 322.

[0069] In such Figure 3 In the example shown, the pipe axis at the first bend head end is parallel to the pipe axis at the second bend end 322. And along the direction from the first bend section 310 to the second bend section 320, the pipe axis at the first bend head end is opposite to the pipe axis at the second bend end 322. Figure 3 In the orientation shown, the pipe at the first bend head end is axially to the right, while the pipe at the second bend end 322 is axially to the left.

[0070] In such Figure 3 In the example shown, the first bending end 312 is directly connected to the second bending start 321 , that is, the first bending segment 310 is directly connected to the second bending segment 320 , and the boundary between the first bending segment 310 and the second bending segment 320 serves as both the first bending end 312 and the second bending start 321 .

[0071] Figure 3 The powder injection pipeline shown is Figure 2 The main difference between the powder injection pipes shown is that the first bending section 310 and the second bending section 320 are directly connected. Other structural parameters can be referred to Figure 2 The corresponding structural parameters in the powder injection pipeline are shown.

[0072] Furthermore, the present invention also provides a plasma spray deposition powder feeding method, which comprises the following steps: using the plasma spray deposition powder feeding device as described in the above embodiment to deliver agglomerated powder materials into the powder injection pipeline. Also, the powder materials are ejected from the discharge port after passing through the first bending section and the second bending section, and plasma is sprayed toward the agglomerated powder materials using a spray gun.

[0073] In the process of passing through the first bending section and the second bending section, the agglomerated powder material collides with the tube wall due to the change in axial direction, which is equivalent to being crushed. This can reduce the overall particle size of the agglomerated powder material and make the agglomerated powder material flowing out of the discharge port easier to be crushed and gasified in the plasma jet.

[0074] The traditional powder injection pipeline adopts a straight pipe design, which usually only uses agglomerated powder materials with a D50 particle size of 10μm-12μm. When the particle size is too low, the fluidity is poor, and when the particle size is too high, it is difficult to be fully gasified by the plasma jet. The plasma spray deposition powder feeding method of the present invention is particularly suitable for larger agglomerated powder materials.

[0075] In some examples of this embodiment, the D50 particle size of the agglomerated powder material is 20 μm to 25 μm. The agglomerated powder material with a D50 particle size of 20 μm to 25 μm has significantly better fluidity, and is crushed in the powder injection pipeline so that the overall particle size is reduced. The overall particle size of the agglomerated powder material flowing out of the discharge port is also smaller, and can be more fully gasified in the plasma jet.

[0076] In some examples of this embodiment, the agglomerated powder material includes primary particles and a binder, and the mass proportion of the binder in the agglomerated powder material is 0.5% to 2%. The primary particles refer to the smallest particles that make up the agglomerated powder material. A plurality of primary particles are combined by the binder and their own van der Waals forces to form an agglomerated powder material. The agglomerated powder material can be broken and form a plurality of separated primary particles when impacted. By using a binder with a mass proportion of 0.5% to 2%, the bonding strength of the agglomerated powder material can be more matched with the plasma spray deposition powder feeding device in the present invention, so that the agglomerated powder material can be more fully broken.

[0077] In some examples of this embodiment, the mass proportion of the binder in the agglomerated powder material can be 0.5%, 0.7%, 0.9%, 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.8%, 2%, or the mass proportion of the binder in the agglomerated powder material can be controlled between any two of the above mass proportions.

[0078] In some examples of this embodiment, the agglomerated powder material may also include other components, such as a dispersant. In the process of preparing the agglomerated powder material, the dispersant can make the primary particles and the binder mix more evenly and fully. The dispersant can be selected from a surfactant.

[0079] In some examples of this embodiment, the method for preparing the agglomerated powder material may include the following steps: mixing and dispersing primary particles and a binder in a solvent to obtain a mixed material, wherein the solid content of the mixed material is 15% to 40%. And, spray granulating the mixed material. The amount of the primary particles and the binder may be determined by the amount of the corresponding components in the agglomerated powder material to be prepared.

[0080] In some examples of this embodiment, during the spray granulation process, the pressure of the compressed gas in the atomizer is controlled to be 0.2MPa~0.6MPa, the inlet temperature of the atomizer is controlled to be 210℃~270℃, and the outlet temperature of the atomizer is controlled to be 110℃~120℃.

[0081] In some examples of this embodiment, during the spray granulation process, a peristaltic pump is also required to feed the material, and the rotation speed of the peristaltic pump can be 33 rpm to 40 rpm.

[0082] In some examples of this embodiment, the step of mixing and dispersing the primary particles and the binder in a solvent may further include a step of adding a dispersant, where the dispersant is used to make the primary particles and the binder mix more fully.

[0083] In some examples of this embodiment, the step of ball milling the mixed material may be further included so that the mixed material forms a slurry with uniform components. The ball milling time may be 2 hours to 12 hours. The ball milling method may be drum ball milling.

[0084] Through the above preparation process, an agglomerated powder material with suitable particle size and bonding strength can be prepared.

[0085] Furthermore, the present invention also provides a plasma spray deposition device, which includes a deposition chamber and a plasma spray deposition powder feeding device as described in the above embodiment, wherein a spray gun in the plasma spray deposition powder feeding device is arranged in the deposition chamber.

[0086] It should be understood that the directional terms such as "front" and "rear" are used in describing the powder injection pipe herein, wherein the first bending section is located before the second bending section, but this is only for the convenience of explaining the structure of each part in the powder injection pipe, and does not implicitly limit the movement direction of the powder material in the powder injection pipe. When the powder injection pipe is actually used, the powder material may also move in the direction from the second bending section toward the first bending section, which depends on the position of the discharge port, and will not be described in detail here.

[0087] In order to facilitate understanding of the technical solution of the present invention, more specific embodiments are provided below. Through the description of the embodiments, the specific implementation of the present invention will be easier to understand, and the advantages of the present invention will also be more obvious.

[0088] Example 1

[0089] Yttria stabilized zirconia (YSZ) particles are provided as primary particles, polyacrylic amine is used as a binder, and polyvinyl alcohol is used as a dispersant. The yttria stabilized zirconia particles, the binder, and the dispersant are mixed in a solvent to obtain a mixed material, wherein the solid content of the mixed material is 20%, the content of the dispersant in the solid component is 0.5%, and the content of the binder is 1%.

[0090] The mixed material was ball milled for 4 h to form a slurry.

[0091] The slurry was placed in an atomizer, the inlet temperature was set to 210°C, the outlet temperature was set to 110°C, and spray granulation was performed to obtain agglomerated powder material with a D50 particle size of 24 μm. The morphology of the agglomerated powder material can be seen in Figure 4 .

[0092] The agglomerated powder material is fed into the powder injection pipeline through the feeder. The powder injection pipeline is equipped with a Figure 1 The first bending section and the second bending section are shown, wherein the first bending section and the second bending section are both in the shape of a quarter arc, the inner radius of the first bending section and the second bending section are both 35 mm, and the inner diameter of the first bending section and the second bending section are both 5 mm.

[0093] Plasma is sprayed by a spray gun, and the agglomerated powder material flows out from the discharge port and enters the plasma center. After vaporization, it is coated on the substrate with a deposition efficiency of 25.62μm / min.

[0094] Example 2

[0095] Ytterbium-doped gadolinium zirconate (GYbz) particles are provided as primary particles, polyacrylamide is used as a binder, and polyvinyl alcohol is used as a dispersant. Yttria-stabilized zirconium oxide particles are mixed with the binder and the dispersant in a solvent to obtain a mixed material, wherein the solid content of the mixed material is 20%, the content of the dispersant in the solid component is 0.04%, and the content of the binder is 0.7%.

[0096] The mixed material was ball milled for 4 h to form a slurry.

[0097] The slurry was placed in an atomizer, the inlet temperature was set to 270°C, the outlet temperature was set to 120°C, and the pressure of the compressed air was set to 0.4 MPa. Spray granulation was performed to obtain agglomerated powder material with a D50 particle size of 22 μm. The morphology of the agglomerated powder material can be seen in Figure 5 .

[0098] The agglomerated powder material is fed into the powder injection pipeline through the feeder. The powder injection pipeline is equipped with a Figure 2The first bending section and the second bending section are shown, wherein the first bending section and the second bending section are both 1 / 4 arc-shaped, the inner radius of the first bending section and the second bending section are both 35mm, and the inner diameter of the first bending section and the second bending section are both 5mm.

[0099] Plasma is sprayed by a spray gun, and the agglomerated powder material flows out from the discharge port and enters the plasma center. After vaporization, it is coated on the substrate with a deposition efficiency of 26.447μm / min.

[0100] Please note that the above embodiments are for illustrative purposes only and are not meant to be limiting of this document.

[0101] It should be understood that, unless otherwise specified herein, there is no strict order restriction for the execution of the steps, and the steps may be executed in other orders. Moreover, at least a portion of the steps in the preparation process may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, and the execution order of these sub-steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0102] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0103] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A plasma spray deposition powder feeding device, characterized in that: It comprises a powder injection pipeline and a spray gun, wherein the spray gun is used to spray plasma, and the powder injection pipeline has a discharge port on a spray path facing the spray gun; The powder injection pipeline includes a first bending section and a second bending section which are arranged in sequence, the first bending section has a first bending start end and a first bending end end, the second bending section has a second bending start end and a second bending end end, the pipeline axial direction at the first bending start end intersects with the pipeline axial direction at the first bending end, and the pipeline axial direction at the second bending start end intersects with the pipeline axial direction at the second bending end.

2. The plasma spray deposition powder feeding device according to claim 1, characterized in that: The axial direction of the pipe at the end of the first bend is the same as the axial direction of the pipe at the beginning of the second bend.

3. The plasma spray deposition powder feeding device according to claim 2, characterized in that: The axial direction of the pipe at the beginning of the first bend is parallel to the axial direction of the pipe at the end of the second bend.

4. The plasma spray deposition powder feeding device according to any one of claims 1 to 3, characterized in that: The bending angle of the powder injection pipe at the first bending section is 45° to 90°; and / or, The bending angle of the powder injection pipe at the second bending section is 45°~90°.

5. The plasma spray deposition powder feeding device according to any one of claims 1 to 3, characterized in that: The axis of the first bending section is in a smooth curve shape; and / or, The axis of the second bending section is in a smooth curve shape.

6. The plasma spray deposition powder feeding device according to claim 5, characterized in that: The inner side of the first bending section is in an arc shape with a radius of 20 mm to 50 mm, and the pipe diameter of the first bending section is 3 mm to 6 mm; and / or, The inner side of the second bending section is in an arc shape with a radius of 20 mm to 50 mm, and the pipe diameter of the second bending section is 3 mm to 6 mm.

7. A plasma spray deposition powder feeding method, characterized in that: The steps include: Using the plasma spray deposition powder feeding device according to any one of claims 1 to 6 to feed agglomerated powder materials into the powder injection pipeline; and, The powder material is made to pass through the first bending section and the second bending section and then be ejected from the discharge port, and the spray gun is used to spray plasma toward the agglomerated powder material.

8. The plasma spray deposition powder feeding method according to claim 7, characterized in that: The D50 particle size of the agglomerated powder material is 20 μm to 25 μm; and / or, The agglomerated powder material includes primary particles and a binder, and the mass proportion of the binder in the agglomerated powder material is 0.5% to 2%.

9. The plasma spray deposition powder feeding method according to any one of claims 7 to 8, characterized in that: The preparation method of the agglomerated powder material comprises the following steps: The primary particles and the binder are mixed and dispersed in a solvent to obtain a mixed material, wherein the solid content of the mixed material is 15% to 40%; The mixed material is subjected to a spray granulation treatment. During the spray granulation treatment, the pressure of the compressed gas in the atomizer is controlled to be 0.2MPa~0.6MPa, the inlet temperature of the atomizer is controlled to be 210℃~270℃, and the outlet temperature of the atomizer is controlled to be 110℃~120℃.

10. A plasma spray deposition device, characterized in that: It comprises a deposition chamber and a plasma spray deposition powder feeding device as claimed in any one of claims 1 to 6, wherein the spray gun in the plasma spray deposition powder feeding device is arranged in the deposition chamber.

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