Aluminum-containing particles

Abstract

To provide aluminum-containing particles having improved fluidity.SOLUTION: Aluminum-containing particles include aluminum-containing particles (A) having no satellite particles and aluminum-containing particles (B) having satellite particles, wherein the aluminum-containing particles (B) having the satellite particles include aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less, the content of the aluminum-containing particles (B) having the satellite particles is 26 particle% or more, and the content of the aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less is 60 particle% or less.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to aluminum-containing particles.

Background Art

[0002] As a technology related to aluminum-containing particles, for example, the technology described in Patent Document 1 is known.

[0003] Patent Document 1 describes particles containing an aluminum alloy, which are substantially spherical in the state of primary particles and have a mixed phase of a phase represented by M x Al y and a phase represented by M z Al w Here, M is a metal other than Al, 0 < x < 1, 0 < y < 1, 0 < z < 1, 0 < w < 1, x / y ≥ 1, z / w < 1, x + y = 1, z + w = 1, and the aluminum content is in the range of 8% to 50% by mass. According to the particles described in Patent Document 1, it is described that particles having a mixed phase of two types of aluminum alloys can be provided in the form of primary particles.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides aluminum-containing particles with improved fluidity.

Means for Solving the Problems

[0006] According to the present invention, the following aluminum-containing particles are provided.

[0007] [1] aluminum-containing particles (A) having no satellite particles; and aluminum-containing particles (B) having satellite particles, the aluminum-containing particles (B) having satellite particles include aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less, the content of the aluminum-containing particles (B) having satellite particles is 26% or more, as calculated by the following <Method 1>, Aluminum-containing particles, wherein the content of aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less is 60% or less, as calculated by the following <Method 2>. <Method 1> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of aluminum-containing particles (B) having satellite particles to the total number of aluminum-containing particles observed is defined as the content of aluminum-containing particles (B) having satellite particles. <Method 2> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less to the total number of aluminum-containing particles observed is defined as the content of aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less. [2] the aluminum-containing particles (B) having satellite particles further include aluminum-containing particles (B2) having satellite particles with a particle diameter of 10.0 μm or more, The aluminum-containing particles according to [1] above, wherein the content of aluminum-containing particles (B2) having satellite particles with a particle diameter of 10.0 μm or more, calculated by the following <Method 3>, is 25% or less. <Method 3> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of aluminum-containing particles (B2) having satellite particles with a particle diameter of 10.0 μm or more to the total number of aluminum-containing particles observed is defined as the content of aluminum-containing particles (B2) having satellite particles with a particle diameter of 10.0 μm or more. [3] The aluminum-containing particles (B) having satellite particles further include aluminum-containing particles (B3) having satellite particles with a particle diameter of more than 5.0 μm and less than 10.0 μm, The aluminum-containing particles according to [1] or [2], wherein the content of aluminum-containing particles (B3) having satellite particles with a particle diameter of more than 5.0 μm and less than 10.0 μm, calculated by the following <Method 4>, is 25% or less. <Method 4> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of aluminum-containing particles (B3) having satellite particles with a particle diameter of more than 5.0 μm and less than 10.0 μm to the total number of aluminum-containing particles observed is defined as the content of aluminum-containing particles (B3) having satellite particles with a particle diameter of more than 5.0 μm and less than 10.0 μm. [4] The aluminum-containing particles according to any one of [1] to [3] above, wherein the content of the aluminum-containing particles (B) having satellite particles calculated by the <Method 1> above is 90% or less. [5] D calculated by the particle size measurement below 50 The aluminum-containing particles according to any one of [1] to [4] above, having a particle diameter of 30.0 μm or more and 60.0 μm or less. <Particle size measurement> 3.0 g of aluminum-containing particles were mixed with 40 mL of water and 10 mL of a 1.3% surfactant, and the mixture was dispersed in an ultrasonic bath for 300 seconds. This mixture was used as a measurement sample, and the volume-based particle size distribution of the aluminum-containing particles was measured using a laser diffraction / scattering particle size analyzer. 10 Particle size, D 50 Particle size and D 90The particle size values ​​are obtained for each. [6] D calculated by the particle size measurement below 10 The aluminum-containing particles according to any one of [1] to [5] above, having a particle diameter of 20.0 μm or more and 40.0 μm or less. <Particle size measurement> 3.0 g of aluminum-containing particles were mixed with 40 mL of water and 10 mL of a 1.3% surfactant, and the mixture was dispersed in an ultrasonic bath for 300 seconds. This mixture was used as a measurement sample, and the volume-based particle size distribution of the aluminum-containing particles was measured using a laser diffraction / scattering particle size analyzer. 10 Particle size, D 50 Particle size and D 90 The particle size values ​​are obtained for each. [7] D calculated by the particle size measurement below 90 The aluminum-containing particles according to any one of [1] to [6] above, having a particle diameter of 50.0 μm or more and 100.0 μm or less. <Particle size measurement> 3.0 g of aluminum-containing particles were mixed with 40 mL of water and 10 mL of a 1.3% surfactant, and the mixture was dispersed in an ultrasonic bath for 300 seconds. This mixture was used as a measurement sample, and the volume-based particle size distribution of the aluminum-containing particles was measured using a laser diffraction / scattering particle size analyzer. 10 Particle size, D 50 Particle size and D 90 The particle size values ​​are obtained for each. [8] The aluminum-containing particles according to any one of [1] to [7] above, which have a sphericity of 0.8 or more. [9] The aluminum-containing particles according to any one of [1] to [8] above, which have an angle of repose measured by an injection method of 50.0° or less.

[10] The aluminum-containing particles according to any one of [1] to [9], which have a fluidity of 15.0 sec / 50 g or less in a Hall flow test in accordance with JIS Z2502:2020.

[11] The aluminum-containing particles according to any one of [1] to

[10] above, wherein the aluminum-containing particles include at least one selected from the group consisting of pure aluminum particles and aluminum-based alloy particles.

[12] The aluminum-containing particles according to

[11] , wherein the aluminum-based alloy particles contain at least one element selected from the group consisting of Cu, Mn, Si, Mg, Zn, and Ni.

[13] The aluminum-containing particles according to

[11] or

[12] , wherein the aluminum-based alloy particles comprise at least one selected from the group consisting of Al-Si-based alloys, Al-Cu-based alloys, Al-Mn-based alloys, Al-Mg-based alloys, Al-Si-Mg-based alloys, Al-Si-Cu-based alloys, Al-Zn-Mg-based alloys, Al-Si-Mg-Cu-based alloys, Al-Cu-Ni-Mg-based alloys, and Al-Zn-Mg-Cu-based alloys.

[14] The aluminum-containing particles according to any one of

[11] to

[13] above, wherein the aluminum-based alloy particles contain at least one selected from the group consisting of AlSi10Mg and AlSi12.

[15] The aluminum-containing particles according to any one of [1] to

[14] above, which can be used as a raw material powder for a 3D printer model. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide aluminum-containing particles having improved fluidity. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram schematically illustrating an example of a cross section of an aluminum-containing particle (B) having satellite particles. [Figure 2] 1 is an SEM image of aluminum-containing particles for explaining how to judge each particle. [Figure 3] 1 is an SEM image of aluminum-containing particles for explaining how to judge each particle. [Figure 4] 1 is an SEM image of aluminum-containing particles for explaining how to judge each particle. [Figure 5] 1 is an SEM image of aluminum-containing particles for explaining how to judge each particle. [Figure 6] 1 is an SEM image of aluminum-containing particles of Example 1. [Figure 7] This is a diagram in which the symbols are added to FIG. 6. [Figure 8] 1 is an SEM image of aluminum-containing particles of Example 1. [Figure 9] This is a diagram in which the symbols are added to FIG. 8. [Figure 10] 1 is an SEM image of aluminum-containing particles of Example 1. [Figure 11] This is a diagram with reference numerals added to FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the drawings are simplified and do not correspond to actual dimensional proportions. Numerical ranges "A to B" represent A or more and B or less unless otherwise specified. In this specification, "aluminum-containing particles (A) having no satellite particles" may be abbreviated as "particles (A)." Similarly, "aluminum-containing particles (B) having satellite particles" may also be abbreviated.

[0011] [Aluminum-containing particles] The aluminum-containing particles of this embodiment include aluminum-containing particles (A) that do not have satellite particles and aluminum-containing particles (B) that have satellite particles, and the aluminum-containing particles (B) that have satellite particles include aluminum-containing particles (B1) that have satellite particles with a particle diameter of 5.0 μm or less, and the content of the aluminum-containing particles (B) that have satellite particles is 26% or more, and the content of the aluminum-containing particles (B1) that have satellite particles with a particle diameter of 5.0 μm or less is 60% or less.

[0012] The aluminum-containing particles are used, for example, as raw material powder for 3D printer models, brazing paste powder, etc. The raw material powder used for 3D printer models is required to improve the mechanical strength and modeling accuracy of the resulting model.

[0013] The present inventors have found that a decrease in powder fluidity may cause the powder to become less dense during modeling using a 3D printer, resulting in a decrease in the mechanical strength of the resulting model.The present inventors have also found that a decrease in powder fluidity may cause a decrease in modeling accuracy due to the occurrence of defects inside the resulting model and the manifestation of unevenness on the surface of the resulting model. That is, the present inventors considered that by improving the fluidity of the powder, it is possible to improve the mechanical strength and molding accuracy of the molded object.

[0014] The present inventors have conducted extensive research to obtain aluminum-containing particles with improved fluidity. As a result, the present inventors have found that, in aluminum-containing particles including aluminum-containing particles (A) having no satellite particles and aluminum-containing particles (B) having satellite particles, the fluidity of the aluminum-containing particles can be improved by setting the content of aluminum-containing particles (B) having satellite particles and the content of aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less within specific numerical ranges. That is, the present invention has found that the measures of the content of particles (B) and the content of particles (B1) are effective as design indicators for improving the fluidity of aluminum-containing particles. That is, the aluminum-containing particles of the present invention have improved fluidity, more specifically, improved dynamic fluidity. Furthermore, the aluminum-containing particles of the present invention can improve the mechanical strength and molding accuracy of objects molded using a 3D printer.

[0015] The aluminum-containing particles of the present embodiment include aluminum-containing particles (A) that do not have satellite particles. The content of particles (A) is preferably 10% or more and 74% or less, more preferably 20% or more and 72% or less, even more preferably 30% or more and 70% or less, even more preferably 40% or more and 69% or less, and even more preferably 44% or more and 68% or less. The content of particles (A) means the value calculated by <Method 5>.

[0016] <Method 5> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of particles (A) to the total number of aluminum-containing particles observed is taken as the content of particles (A).

[0017] The aluminum-containing particles of the present embodiment include aluminum-containing particles (B) having satellite particles. FIG. 1 is a diagram schematically illustrating an example of a cross section of an aluminum-containing particle (B) having satellite particles. Particle (B) 100 refers to a particle in which satellite particles 20 are attached to a main particle 10. Here, in this specification, the main particle 10 refers to the particle with the largest particle diameter contained in particle (B), and particles other than the main particle 10 contained in particle (B) are referred to as satellite particles 20. It can also be said that particle (A) is a particle consisting only of main particles 10. The particles (B) may contain a plurality of satellite particles.

[0018] The content of particles (B) is 26% or more. The content of particles (B) is preferably 26% or more and 90% or less, more preferably 28% or more and 80% or less, even more preferably 30% or more and 70% or less, even more preferably 31% or more and 60% or less, and even more preferably 32% or more and 56% or less. The content of particles (B) means the value calculated by <Method 1>.

[0019] <Method 1> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of particles (B) to the total number of aluminum-containing particles observed is taken as the content of particles (B).

[0020] The content of particles (B) can be adjusted to a desired value, for example, by adjusting the production conditions when producing aluminum-containing particles by a disk atomization method, specifically, by adjusting the rotation speed of the rotating disk; by adjusting the oxygen concentration in the atmosphere; etc.

[0021] The aluminum particles of this embodiment include aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less. The particle (B1) is sufficient as long as the particle diameter of the satellite particles 20 is 5.0 μm or less, and the particle diameter of the main particles 10 is not particularly limited. The particle diameter of the satellite particles 20 of the particles (B1) is, for example, 1.0 μm or more.

[0022] The content of the particles (B1) is 60% or less. The content of particles (B1) is preferably 5% or more and 55% or less, more preferably 10% or more and 50% or less, and even more preferably 12% or more and 45% or less. The content of particles (B1) means the value calculated by <Method 2>.

[0023] <Method 2> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of particles (B1) to the total number of aluminum-containing particles observed is taken as the content of particles (B1).

[0024] The content of particles (B1) can be adjusted to a desired value, for example, by adjusting the production conditions when producing aluminum-containing particles by a disk atomization method, specifically, by adjusting the rotation speed of the rotating disk; by adjusting the oxygen concentration in the atmosphere; etc.

[0025] The aluminum-containing particles of this embodiment preferably further contain aluminum-containing particles (B2) having satellite particles with a particle diameter of 10.0 μm or more. The particle (B2) may be any particle as long as the particle diameter of the satellite particles 20 is 10.0 μm or more, and the particle diameter of the main particles 10 is not particularly limited. The particle diameter of the satellite particles 20 of the particles (B2) may be, for example, 50.0 μm or less, or 30.0 μm or less.

[0026] The content of particles (B2) is preferably 1% or more and 25% or less, more preferably 3% or more and 20% or less, and even more preferably 5% or more and 15% or less. The content of particles (B2) means the value calculated by <Method 3>.

[0027] <Method 3> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of particles (B2) to the total number of aluminum-containing particles observed is taken as the content of particles (B2).

[0028] The aluminum-containing particles of this embodiment preferably further include aluminum-containing particles (B3) having satellite particles with a particle diameter of more than 5.0 μm and less than 10.0 μm. The particle (B3) may have a particle diameter of the satellite particles 20 exceeding 5.0 μm and less than 10.0 μm, and the particle diameter of the main particles 10 is not particularly limited.

[0029] The content of particles (B3) is preferably 1% or more and 25% or less, more preferably 2% or more and 23% or less, and even more preferably 3% or more and 20% or less. The content of particles (B3) means the value calculated by <Method 4>.

[0030] <Method 4> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of particles (B3) to the total number of aluminum-containing particles observed is taken as the content of particles (B3).

[0031] Hereinafter, the methods of observing aluminum-containing particles using a scanning electron microscope in <Method 1> to <Method 5> will be specifically explained.

[0032] First, a method for preparing an observation sample for observation using a scanning electron microscope will be described. The observation sample is a sample in which 100 or more aluminum-containing particles are dispersed so as not to overlap one another. The method for preparing the observation sample is not particularly limited, but it can be prepared, for example, by placing double-sided tape on the surface of a pedestal, dropping aluminum-containing particles onto the exposed surface of the double-sided tape, and removing excess aluminum-containing particles with air or the like.

[0033] Next, the observation sample is imaged using a scanning electron microscope to obtain SEM images. At this time, for each level, for example, 20 or more SEM images are obtained while shifting the imaging position. The magnification is not particularly limited as long as it is large enough to confirm satellite particles, but is, for example, 500 times. The scanning electron microscope that can be used is, for example, SU8200 (manufactured by Hitachi High-Technologies Corporation).

[0034] Hereinafter, the method for determining the particles (A), (B), and (B1) to (B3) will be specifically described.

[0035] 2 to 5 are SEM images of aluminum-containing particles for explaining how to determine each particle.

[0036] First, using the obtained SEM image, 100 or more aluminum-containing particles are observed and visually determined whether or not they contain satellite particles. Aluminum-containing particles that do not contain satellite particles and can be determined to be clearly composed of a single particle are designated as aluminum-containing particles (A) that do not contain satellite particles. Aluminum-containing particles that can be determined to clearly contain satellite particles are designated as aluminum-containing particles (B) that contain satellite particles.

[0037] Here, the aluminum-containing particles in FIGS. 2 and 3 are particles in which the coating 30 is attached to at least a part of the main particle 10 (hereinafter also referred to as "coated particles"). Even among such coated particles, aluminum-containing particles that can be clearly determined to have satellite particles 20, as shown in Figure 2, are judged to be aluminum-containing particles (B) that have satellite particles. On the other hand, particles in which satellite particles 20 cannot be confirmed, as shown in Figure 3, are judged to be aluminum-containing particles (A) that do not have satellite particles.

[0038] In the SEM image, only a portion of the aluminum-containing particle is imaged, and the entire particle cannot be grasped. However, the presence or absence of satellite particles cannot be clearly determined, so the aluminum-containing particle is not used as an observation target. Specifically, the aluminum-containing particle in which only a portion is imaged is the particle designated by symbol C in the examples.

[0039] Furthermore, although the observation sample is prepared by dispersing the aluminum-containing particles so that they do not overlap with one another, there are cases where it is unavoidable that some of the aluminum-containing particles overlap with one another. Figure 4 is an SEM image in which parts of the outermost surfaces of aluminum-containing particles overlap each other. As in Figure 4, when the entirety of each aluminum-containing particle can be grasped and the presence or absence of satellite particles can be determined, each aluminum-containing particle may be used as the object of observation. In Figure 4, it is determined that there is one aluminum-containing particle (A) without satellite particles and one aluminum-containing particle (B) with satellite particles. Furthermore, even when most of the aluminum-containing particles overlap each other and the entirety of each aluminum-containing particle cannot be grasped, the particle is still observed, and the group of particles is determined to be aluminum-containing particles (B) having satellite particles. In calculating the particle size of the satellite particles described below, the particle that can be determined to have the largest particle size in the group of particles in the SEM image is treated as the main particle, and the other particles are treated as satellite particles.

[0040] Next, the particle diameter of the satellite particles determined to be aluminum-containing particles (B) having satellite particles is measured, and the particles are classified as aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less, aluminum-containing particles (B2) having satellite particles with a particle diameter of 10.0 μm or more, and aluminum-containing particles (B3) having satellite particles with a particle diameter of more than 5.0 μm but less than 10.0 μm. The particle diameter of the satellite particles means the major axis diameter of the satellite particles. The particle size of the satellite particles can be measured using, for example, image analysis software, such as ImageJ.

[0041] As shown in FIG. 5, the aluminum-containing particle (B) having satellite particles may have a main particle 10 to which a plurality of satellite particles 20 are attached. In the case of particles such as those shown in Figure 5, the particle size of the largest satellite particle is used to determine whether the particle is one of particles (B1) to (B3). For example, an aluminum-containing particle having a satellite particle with a particle size of 12.0 μm and another satellite particle with a particle size of 2.5 μm is determined to be an aluminum-containing particle (B2) having satellite particles with a particle size of 10.0 μm or more, rather than an aluminum-containing particle (B1) having satellite particles with a particle size of 5.0 μm or less.

[0042] Here, particles (B) can be classified into any of particles (B1) to (B3). Therefore, the number of particles (B) is equal to the total number of particles (B1) to (B3). However, the content of particles (B) may not be equal to the total content of particles (B1) to (B3) due to significant digits.

[0043] D of the aluminum-containing particles of this embodiment 50 The particle size is preferably 30.0 μm or more and 60.0 μm or less, more preferably 32.0 μm or more and 55.0 μm or less, and even more preferably 35.0 μm or more and 53.0 μm or less.

[0044] D of the aluminum-containing particles of this embodiment 10 The particle size is preferably 20.0 μm or more and 40.0 μm or less, more preferably 22.0 μm or more and 38.0 μm or less, and even more preferably 25.0 μm or more and 36.0 μm or less.

[0045] D of the aluminum-containing particles of this embodiment 90 The particle size is preferably 50.0 μm or more and 100.0 μm or less, more preferably 52.0 μm or more and 95.0 μm or less, even more preferably 55.0 μm or more and 90.0 μm or less, and even more preferably 56.0 μm or more and 85.0 μm or less.

[0046] Here, D of aluminum-containing particles 10 Particle size, D 50 Particle size and D 90 The particle diameters refer to values ​​calculated by the <Particle diameter measurement> below.

[0047] <Particle size measurement> 3.0 g of aluminum-containing particles were mixed with 40 mL of water and 10 mL of a 1.3% surfactant, and the mixture was dispersed in an ultrasonic bath for 300 seconds. This mixture was used as a measurement sample, and the volume-based particle size distribution of the aluminum-containing particles was measured using a laser diffraction / scattering particle size analyzer. 10 Particle size, D 50 Particle size and D 90 The particle size values ​​are obtained for each. Here, as a surfactant with a concentration of 1.3%, for example, an aqueous solution obtained by diluting the concentrate of Fruit Acid-Blended Fresh Green Apple (manufactured by Rocket Soap Co., Ltd.) 11 times can be used. The surfactant is, for example, linear alkylbenzenesulfonate sodium.

[0048] The sphericity of the aluminum-containing particles of this embodiment is preferably 0.8 or more, more preferably 0.85 or more, and even more preferably 0.9 or more. The sphericity of an aluminum-containing particle means a value calculated by image analysis of an image obtained by a scanning electron microscope. Specifically, the sphericity of a single aluminum-containing particle is calculated by measuring the minor axis length and major axis length of the aluminum-containing particle, calculating the sphericity of the particle using the formula: sphericity = minor axis length / major axis length, and then calculating the arithmetic average of the sphericities of 100 or more aluminum-containing particles.

[0049] The angle of repose of the aluminum-containing particles according to this embodiment, when measured by the injection method, is preferably 50.0° or less, more preferably 45.0° or less, and even more preferably 40.0° or less, from the viewpoint of further improving fluidity. The lower limit is not particularly limited, but may be, for example, 25.0° or more or 30.0° or more. Furthermore, the angle of repose of the aluminum-containing particles according to this embodiment, when measured by the injection method, is preferably 25.0° or more and 50.0° or less, more preferably 25.0° or more and 45.0° or less, and even more preferably 30.0° or more and 40.0° or less, from the viewpoint of further improving fluidity. Here, the angle of repose of aluminum-containing particles by the injection method refers to the angle between the generatrix of a cone obtained by dropping and depositing aluminum-containing particles on a horizontal surface in an environment of 18 to 23°C and 20 to 50% RH, measuring the angle between the generatrix of the left and right cones and the horizontal surface, and averaging the angles between the generatrix of the left and right cones and the horizontal surface. Specifically, the angle of repose of aluminum-containing particles by the injection method can be determined by depositing the aluminum-containing particles on a horizontal surface at a constant speed (2 g / sec) through a funnel (discharge hole diameter 8 mm) and measuring the angle between the deposited powder and the horizontal surface. The distance from the discharge hole of the funnel to the horizontal surface is, for example, 45 mm. The angle of repose of aluminum-containing particles obtained by the injection method can be measured, for example, by taking a photograph of the deposited powder from a horizontal angle and using image processing software (for example, Paint.NET).

[0050] From the viewpoint of further improving fluidity, the fluidity of the aluminum-containing particles of this embodiment, as measured in a hole flow test in accordance with JIS Z2502:2020, is preferably 15.0 sec / 50 g or less, more preferably 13.0 sec / 50 g or less, and even more preferably 12.0 sec / 50 g or less. The lower limit is not particularly limited, but may be, for example, 5.0 sec / 50 g or more, or 7.0 sec / 50 g or more. The fluidity of aluminum-containing particles measured by a Hall flow test means the time it takes for 50 g of aluminum-containing particles to flow through the orifice of a calibrated funnel with specified dimensions, as measured in accordance with JIS Z2502:2020. In this specification, the fluidity of the aluminum-containing particles in the Hall Flow test can be determined by measuring the flow time of the aluminum-containing particles twice and averaging the two measured values. Furthermore, if one of the two measurements is obtained and the other is not obtained, the obtained measured value may be used as the fluidity of the aluminum-containing particles in the Hall Flow test.

[0051] The aluminum-containing particles of the present embodiment are not particularly limited as long as they contain aluminum (Al) element, but preferably contain at least one selected from the group consisting of pure aluminum particles and aluminum-based alloy particles, and more preferably contain aluminum-based alloy particles. Here, the term "pure aluminum particles" refers to particles made of aluminum with a purity of 99.00% or more (so-called 1000 series aluminum), and the term "aluminum alloy particles" refers to aluminum alloys containing Al as the main component.

[0052] The aluminum-based alloy particles of the present embodiment preferably contain at least one element selected from the group consisting of Cu, Mn, Si, Mg, Zn, and Ni, and more preferably contain at least one element selected from the group consisting of Si and Mg. When the aluminum-based alloy particles of this embodiment contain Si, the content of Si in the aluminum-based alloy particles is preferably 7.00 mass% or more and 15.00 mass% or less, more preferably 8.00 mass% or more and 14.00 mass% or less, and even more preferably 9.00 mass% or more and 11.00 mass% or less, when the aluminum-based alloy particles are taken as 100.00 mass%. When the aluminum-based alloy particles of this embodiment contain Mg, the content of Mg in the aluminum-based alloy particles is preferably 0.10 mass% or more and 0.60 mass% or less, and more preferably 0.20 mass% or more and 0.45 mass% or less, when the aluminum-based alloy particles are taken as 100.00 mass%. The content of the other elements is not particularly limited, and may be set to an appropriate amount. The content of each element can be determined by elemental analysis using, for example, solid state emission spectrometry.

[0053] The aluminum-based alloy particles of this embodiment preferably contain at least one selected from the group consisting of Al-Si-based alloys, Al-Cu-based alloys, Al-Mn-based alloys, Al-Mg-based alloys, Al-Si-Mg-based alloys, Al-Si-Cu-based alloys, Al-Zn-Mg-based alloys, Al-Si-Mg-Cu-based alloys, Al-Cu-Ni-Mg-based alloys, and Al-Zn-Mg-Cu-based alloys, and more preferably contain at least one selected from the group consisting of Al-Si-based alloys and Al-Si-Mg-based alloys.

[0054] The composition of the aluminum-based alloy particles of this embodiment is not particularly limited, and may be any composition selected from the group consisting of, for example, aluminum alloys for rolling, aluminum alloys for casting, and aluminum alloys for die casting, but is preferably an aluminum alloy composition for casting. The composition of the aluminum alloy for casting is, for example, the composition specified in JIS H2211:2010.

[0055] The aluminum-based alloy particles of this embodiment preferably contain at least one selected from the group consisting of AlSi10Mg and AlSi12, and more preferably contain AlSi10Mg. Here, AlSi10Mg and AlSi12 refer to alloys that satisfy the composition specified in JIS H2211:2010.

[0056] [Uses of aluminum-containing particles] The use of the aluminum-containing particles of this embodiment is not particularly limited. The aluminum-containing particles of this embodiment are aluminum-containing particles that can be used for, for example, at least one selected from the group consisting of raw material powders for 3D printer models and brazing paste powders, and are preferably aluminum-containing particles that can be used for aluminum-containing particles.

[0057] [Method of manufacturing aluminum-containing particles] A preferred embodiment of the method for producing aluminum-containing particles according to this embodiment will be described.

[0058] The method for producing aluminum-containing particles of this embodiment preferably includes a step (A) of obtaining aluminum-containing particles (a) by disk atomization, and a step (B) of classifying the aluminum-containing particles (a) to obtain aluminum-containing particles (b). The method for producing aluminum-containing particles of this embodiment may further include a step (C) of classifying the aluminum-containing particles (b) after the step (B).

[0059] Hereinafter, each step in the method for producing aluminum-containing particles of this embodiment will be described.

[0060] <Molten metal preparation process> The method for producing aluminum-containing particles of the present embodiment preferably includes, prior to step (A), a step of preparing a molten metal that serves as a raw material for the aluminum-containing particles.

[0061] The method for preparing the molten metal is not particularly limited, and examples thereof include a method in which aluminum alloy ingot is placed in a primary furnace and heated; a method in which aluminum ingot and each element are placed in a primary furnace and heated so as to obtain the desired composition of aluminum-containing particles; and the like. The molten metal of this embodiment may also contain flux. The flux may be, for example, a mixed salt of a chlorine compound (NaCl·KCl) and a fluorine compound (NaF·Na2SiF6). The content of the flux in the molten metal in this embodiment may be, for example, 0.1 parts by mass or more and 1 part by mass or less, or 0.2 parts by mass or more and 0.3 parts by mass or less, when the aluminum alloy base metal (or the total of the aluminum base metal and each element) is taken as 100 parts by mass.

[0062] The heating temperature when preparing the molten metal is not particularly limited, and may be adjusted appropriately taking into consideration the melting point of aluminum or the melting point of the aluminum-based alloy (or the melting point of the aluminum-based alloy derived from the composition of the target aluminum-containing particles). When the aluminum-containing particles of the present embodiment contain AlSi10Mg, the heating temperature is preferably 700°C or higher and 900°C or lower, more preferably 800°C or higher and 850°C or lower.

[0063] The molten metal obtained in the primary furnace may be transferred to a secondary furnace and held in the secondary furnace. The temperature at which the molten metal is maintained is not particularly limited, and may be appropriately adjusted taking into consideration the melting point of aluminum or the melting point of the aluminum-based alloy (or the melting point of the aluminum-based alloy derived from the composition of the target aluminum-containing particles). When the aluminum-containing particles of the present embodiment contain AlSi10Mg, the holding temperature is preferably 600°C or higher and 900°C or lower, more preferably 650°C or higher and 800°C or lower.

[0064] The primary furnace and the secondary furnace are not particularly limited as long as they are melting furnaces that can be used to produce molten metal, and for example, electric furnaces, high-frequency induction furnaces, etc. can be used.

[0065] <Process (A)> The method for producing aluminum-containing particles of the present embodiment preferably includes a step (A) of obtaining aluminum-containing particles (a) by disk atomization.

[0066] In step (A), the diameter of the rotary disk is not particularly limited, but is preferably φ30 mm or more and φ40 mm or less. In step (A), the rotation speed of the rotary disk is preferably 70,000 rpm or more and 90,000 rpm or less, more preferably 75,000 rpm or more and 88,000 rpm or less, and even more preferably 78,000 rpm or more and 85,000 rpm or less, from the viewpoint of adjusting the content of particles (B) and particles (B1) within an appropriate range.

[0067] In step (A), the rate of tapping of the molten metal is preferably 25 kg / h or more and 55 kg / h or less, more preferably 30 kg / h or more and 50 kg / h or less. When the amount of the molten metal tapped is equal to or greater than the lower limit, the production amount per unit time can be improved. On the other hand, when the amount of the molten metal tapped is equal to or less than the upper limit, the proportion of coarse particles in the aluminum-containing particles (a) can be reduced, thereby improving the classification yield. The amount of molten metal discharged can be adjusted, for example, by adjusting the nozzle diameter of the secondary furnace.

[0068] The oxygen concentration in the atmosphere in step (A) is preferably 1500 ppm or less, more preferably 1000 ppm or less, even more preferably 400 ppm or less, even more preferably 100 ppm or less, and even more preferably 30 ppm or less, from the viewpoint of adjusting the content of particles (B) and particles (B1) within an appropriate range.

[0069] The type of disk atomizer used in step (A) is not particularly limited, but for example, a spherical powder manufacturing device (manufactured by Minerva Kiki Co., Ltd.) can be used.

[0070] <Process (B)> The method for producing aluminum-containing particles of the present embodiment preferably includes a step (B) of classifying the aluminum-containing particles (a) to obtain aluminum-containing particles (b). Step (B) is a step carried out after step (A). An optional step may be provided between step (A) and step (B).

[0071] Step (B) is preferably a step of removing coarse particles from aluminum-containing particles (a) to obtain aluminum-containing particles (b), and specifically, it is a step of sieving aluminum-containing particles (a) using a sieve and recovering aluminum-containing particles (a) that have passed through the sieve to obtain aluminum-containing particles (b). Here, the opening diameter of the sieve is, for example, 200 μm or more and 300 μm or less, preferably 250 μm.

[0072] The classifier used in step (B) is not particularly limited, but for example, a vibrating sieve with an ultrasonic oscillator (manufactured by Koei Sangyo Co., Ltd.) can be used.

[0073] <Stirring process> The method for producing aluminum-containing particles of the present embodiment preferably includes a step of stirring the aluminum-containing particles (b) between the step (B) and the step (C).

[0074] The method for stirring the aluminum-containing particles (b) is not particularly limited, but may be, for example, a method of stirring the aluminum-containing particles (b) using a mixer. As the mixer, for example, an infinite mixer (manufactured by Tokuju Kogyosho Co., Ltd.) can be used.

[0075] <Process (C)> The method for producing aluminum-containing particles of the present embodiment preferably includes a step (C) of classifying the aluminum-containing particles (b). Step (C) is a step carried out after step (B). An optional step may be provided between step (B) and step (C).

[0076] In the step (C), the method for classifying the aluminum-containing particles (b) is not particularly limited. Step (C) may be, for example, a step of removing coarse particles and fine powder from the aluminum-containing particles (b), a step of removing only coarse particles from the aluminum-containing particles (b), or a step of removing only fine powder from the aluminum-containing particles (b).

[0077] Step (C) is a step of classifying the aluminum-containing particles (b), for example, by sieving the aluminum-containing particles (b) using an upper screen and a lower screen as sieves and recovering the aluminum-containing particles (b) that passed through the upper screen but not the lower screen. Furthermore, step (C) may be, for example, a step of classifying the aluminum-containing particles (b) by sieving the aluminum-containing particles (b) using only the upper mesh as a sieve and recovering the aluminum-containing particles (b) that have passed through the upper mesh, or a step of classifying the aluminum-containing particles (b) by sieving the aluminum-containing particles (b) using only the lower mesh as a sieve and recovering the aluminum-containing particles (b) that have not passed through the lower mesh.

[0078] The opening diameter of the upper screen is, for example, 40 μm to 180 μm, preferably 45 μm to 170 μm, more preferably 50 μm to 70 μm, and the opening diameter of the lower screen is, for example, 5 μm to 30 μm, preferably 10 μm to 20 μm. By appropriately adjusting the opening diameter of the upper screen and the opening diameter of the lower screen, the particle diameter (D 10 Particle size, D 50 Particle size and D 90 The particle size can be adjusted to a desired value.

[0079] The classifier used in step (C) is not particularly limited, but for example, a Hi-Bolter (blow-through type classifier manufactured by Toyo Hightec Co., Ltd.) can be used.

[0080] <Other processes> The method for producing aluminum-containing particles of the present embodiment may include other steps in addition to the steps described above.

[0081] The aluminum-containing particles of the present embodiment may be aluminum-containing particles obtained after step (C) in the method for producing aluminum-containing particles, may be aluminum-containing particles (a), or may be aluminum-containing particles (b) obtained before step (C).

[0082] Although the embodiments of the present invention have been described above, these are merely examples of the present invention, and various other configurations can also be adopted. Furthermore, the present invention is not limited to the above-described embodiment, and modifications and improvements within the scope of achieving the object of the present invention are included in the present invention. [Example]

[0083] The present embodiment will be described in detail below based on examples and comparative examples, but the present embodiment is not limited to the descriptions of these examples.

[0084] [Example 1] <Molten metal preparation process> An aluminum alloy ingot (AlSi10Mg) was placed in a primary furnace (electric furnace manufactured by Ducor Corporation), and a flux (product name: Tsubasa Flux Smokeless manufactured by Tokyo Molex Crucible Co., Ltd.) was added so that the amount was 0.2 parts by mass per 100 parts by mass of the aluminum alloy ingot. The mixture was then heated to 830°C to prepare a molten metal. The obtained molten metal was transferred from the primary furnace to a secondary furnace (high-frequency induction furnace manufactured by High Frequency Systems Co., Ltd.) The molten metal was maintained at a temperature of 700°C in the secondary furnace.

[0085] <Atomization process (process (A))> Using the molten metal in the secondary furnace as a raw material, aluminum-containing particles (a) were obtained by disk atomization under the following conditions. Disk atomizing device: spherical powder manufacturing device (Minerva Machinery Co., Ltd.) Rotating disc diameter: φ35mm Revolutions per minute: 82,000 rpm Molten metal output: 45 kg / h Secondary furnace nozzle diameter: φ2mm Oxygen concentration: 1000±200 ppm

[0086] Here, the oxygen concentration refers to the oxygen concentration in the spray chamber, and refers to the value measured using an oxygen concentration meter (product name: zirconia oxygen concentration meter RF-30, manufactured by Toray Engineering Co., Ltd.) The oxygen concentration was adjusted to the target oxygen concentration by appropriately injecting compressed air or nitrogen gas into the spray chamber.

[0087] <1st classification process (process (B))> The aluminum-containing particles (a) were classified using a vibrating sieve (manufactured by Koei Sangyo Co., Ltd., product name: vibrating sieve with ultrasonic oscillator UB70UR-3S, sieve mesh opening diameter: 250 μm) to obtain aluminum-containing particles (b). Here, the aluminum-containing particles (a) that passed through the sieve mesh were collected and used as aluminum-containing particles (b).

[0088] <Stirring process> The aluminum-containing particles (b) were stirred using a mixer (manufactured by Tokuju Kogyosho Co., Ltd., product name: Infinite Mixer MM-220) at 29 rpm for 5 minutes.

[0089] <Second classification process (process (C))> The aluminum-containing particles (b) were classified using a blow-through classifier (manufactured by Toyo Hightec Co., Ltd., product name: Hibolter NR-600SD type (two-stage)) to obtain the aluminum-containing particles of Example 1. Here, the aluminum-containing particles (b) that passed through the upper screen (opening diameter: vertical 58 μm, horizontal 60 μm) but did not pass through the lower screen (opening diameter: vertical 20 μm, horizontal 20 μm) in Example 1 were collected and used as the aluminum-containing particles.

[0090] [Examples 2 to 5] The aluminum-containing particles (b) were produced under the same conditions as those in the <molten metal preparation step> to <first classification step (step (B))> in Example 1, using the conditions shown in Table 1. The obtained aluminum-containing particles (b) were used as the aluminum-containing particles of Examples 2 to 5. That is, in Examples 2 to 5, the <stirring step> and the <second classification step (step (C))> in Example 1 were not carried out.

[0091] [Comparative Example 1] Aluminum-containing particles of Comparative Example 1 were obtained in the same manner as in Example 1, except that the conditions shown in Table 1 were used.

[0092] In Table 1, "Flux" indicates whether or not flux was added in the molten metal preparation step. In addition, in Table 1, the numerical values ​​shown under "upper screen" and "lower screen" refer to the opening diameter of the screen of the classifier in the second classification step.

[0093] [measurement] The aluminum-containing particles of Examples 1 to 5 and Comparative Example 1 were subjected to the following measurements.

[0094] <Elemental analysis> Using a solid-state optical emission analyzer (manufactured by Thermo Fischer Scientific, product name: ARL-3460), elemental analysis by solid-state optical emission spectrometry was performed on the aluminum-containing particles of Examples 1 to 5 and Comparative Example 1. As a result of the elemental analysis, the composition of each of the aluminum-containing particles was found to be an alloy represented by AlSi10Mg.

[0095] <Content of particles (B), etc.> First, an observation sample was prepared by fixing 100 or more aluminum-containing particles to the surface of a base. Here, the aluminum-containing particles were dispersed so that they did not overlap with each other. Specifically, double-sided tape was placed on the surface of the base, and the aluminum-containing particles were dropped onto the exposed surface of the double-sided tape. The excess aluminum-containing particles were then removed with air to prepare the observation sample. Using a scanning electron microscope (Hitachi High-Tech Corporation, product name: SU8200), SEM images were obtained at 500x magnification of the sample for observation. For each level, more than 20 images were obtained by shifting the imaging position.

[0096] First, using the obtained SEM image, 100 or more aluminum-containing particles were observed to determine the number of aluminum-containing particles (A) without satellite particles and the number of aluminum-containing particles (B) with satellite particles. Then, the ratio of the number of particles (A) and the number of particles (B) to the total number of particles observed was calculated to determine the content of particles (A) and the content of particles (B), respectively.

[0097] Next, the particle size of the satellite particles was measured for the aluminum-containing particles (B) having satellite particles, and the number of aluminum-containing particles (B1) having satellite particles with a particle size of 5.0 μm or less, the number of aluminum-containing particles (B2) having satellite particles with a particle size of 10.0 μm or more, and the number of aluminum-containing particles (B3) having satellite particles with a particle size of more than 5.0 μm and less than 10.0 μm were calculated. Then, the proportions of the number of particles (B1), particles (B2), and particles (B3) to the total number of particles observed were calculated, and the contents of particles (B1), particles (B2), and particles (B3) were calculated.

[0098] The particles (A), (B) and (B1) to (B3) were judged based on the judgment method for the particles (A), (B) and (B1) to (B3) described in the mode for carrying out the invention.

[0099] The number and content of each particle in Examples 1 to 5 and Comparative Example 1 are shown in Table 2. Note that the number and content of particles (B1) to (B3) in Comparative Example 1 were not measured.

[0100] Figures 6, 8 and 10 are SEM images of the aluminum-containing particles of Example 1. Figure 7 is a diagram with the same reference numerals as Figure 6. Figure 9 is a diagram with the same reference numerals as Figure 8. Figure 11 is a diagram with the same reference numerals as Figure 10. 7, 9, and 11, the symbols A, B, and B1 to B3 correspond to particle (A), particle (B), and particles (B1) to (B3), respectively. Symbol C is an aluminum-containing particle in which only a portion of the particle was imaged. The particle marked with symbol C was not observed.

[0101] <Particle size> The measurement sample was prepared by mixing 3.0 g of aluminum-containing particles with 40 mL of water and 10 mL of a 1.3% surfactant, dispersing the mixture in an ultrasonic bath for 300 seconds, and then measuring the concentration of the surfactant. The 1.3% surfactant was prepared by diluting 11 times the original solution of Fresh Green Apple with Fruit Acid (manufactured by Rocket Soap Co., Ltd., surfactant (linear alkylbenzene sulfonate) 14%). Specifically, the 1.3% surfactant was prepared by diluting 50 mL of the original solution of Fresh Green Apple with Fruit Acid with 500 mL of water. The volume-based particle size distribution of aluminum-containing particles was measured using a laser diffraction / scattering particle size analyzer (Microtrac, product name: MT-3300EX II) for the measurement sample, and D 10 Particle size, D 50 Particle size and D 90 The particle size values ​​were obtained respectively.

[0102] <Sphericity> The sphericity of the aluminum-containing particles was determined by image analysis using ImageJ of the SEM images obtained in the above <Content of particles (B), etc.>. Specifically, the minor axis length and major axis length of the aluminum-containing particles were measured, and the sphericity of one aluminum-containing particle was determined using the formula: sphericity = minor axis length / major axis length. The sphericity of 100 or more aluminum-containing particles was then calculated as the arithmetic average, and this value was taken as the sphericity of the aluminum-containing particles.

[0103] <Angle of repose> In an environment of 18-23°C and 20-50% RH, 80 g of aluminum-containing particles were deposited at a constant speed (2 g / sec) on the horizontal surface of a base (φ83 mm) through a funnel (Entec Corporation, product name: 201N, discharge hole diameter: 8 mm), and the angle between the deposited powder and the horizontal plane was measured. The angle between the deposited powder and the horizontal plane was measured by photographing the deposited powder from a horizontal angle and using image processing software (Paint.NET). The distance from the discharge hole of the funnel to the horizontal plane was 45 mm. The angle of repose of the aluminum-containing particles was determined as the average angle between the generatrix of the left and right cones and the horizontal plane.

[0104] <Liquidity> The flowability was measured by a Hall flow test in accordance with JIS Z2502:2020, i.e., the time [sec / 50g] required for 50g of aluminum-containing particles to flow through the orifice of a calibrated funnel with specified dimensions was measured. In Table 3, "ND" means that the powder did not flow even when the orifice was opened, or the flow stopped during measurement, i.e., no measurement value was obtained.

[0105] Table 3 shows the measurement results of the particle size, sphericity, angle of repose, and flowability of the aluminum-containing particles of Examples 1 to 5 and Comparative Example 1, respectively.

[0106] [Table 1]

[0107] [Table 2]

[0108] [Table 3]

[0109] The aluminum-containing particles of the examples were evaluated for fluidity by the Hall flow test to be better than the aluminum-containing particles of the comparative examples. That is, the aluminum-containing particles of the present embodiment can improve dynamic fluidity.

[0110] The 3D printer-produced objects using the aluminum-containing particles of the Examples had better mechanical strength than the 3D printer-produced objects using the aluminum-containing particles of the Comparative Examples. Furthermore, the 3D printer-produced objects using the aluminum-containing particles of the Examples had fewer internal defects and fewer apparent irregularities on the surface of the objects than the 3D printer-produced objects using the aluminum-containing particles of the Comparative Examples, and thus had superior modeling accuracy. [Explanation of symbols]

[0111] 10 main particles 20 Satellite particles 30 Covering 100 particles (B) A particle (A) B particle (B) B1 particle (B1) B2 particle (B2) B3 Particles (B3) C. Only a portion of the aluminum-containing particle is imaged.

Claims

1. aluminum-containing particles (A) having no satellite particles; and aluminum-containing particles (B) having satellite particles, The aluminum-containing particles (B) having satellite particles include aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less, the content of the aluminum-containing particles (B) having satellite particles is 26% or more, as calculated by the following <Method 1>, The content of aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less is 60% or less, as calculated by the following <Method 2>. <Method 1> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of aluminum-containing particles (B) having satellite particles to the total number of aluminum-containing particles observed is defined as the content of aluminum-containing particles (B) having satellite particles. <Method 2> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less to the total number of aluminum-containing particles observed is defined as the content of aluminum-containing particles (B1) having satellite particles with a particle diameter of 5.0 μm or less.

2. the aluminum-containing particles (B) having satellite particles further include aluminum-containing particles (B2) having satellite particles having a particle diameter of 10.0 μm or more, The aluminum-containing particles according to claim 1, wherein the content of the aluminum-containing particles (B2) having satellite particles with a particle diameter of 10.0 μm or more, calculated by the following <Method 3>, is 25% or less. <Method 3> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of aluminum-containing particles (B2) having satellite particles with a particle diameter of 10.0 μm or more to the total number of aluminum-containing particles observed is defined as the content of aluminum-containing particles (B2) having satellite particles with a particle diameter of 10.0 μm or more.

3. The aluminum-containing particles (B) having satellite particles further include aluminum-containing particles (B3) having satellite particles with a particle diameter of more than 5.0 μm and less than 10.0 μm, The aluminum-containing particles according to claim 1 or 2, wherein the content of aluminum-containing particles (B3) having satellite particles with a particle diameter of more than 5.0 μm and less than 10.0 μm, calculated by the following <Method 4>, is 25% or less. <Method 4> The aluminum-containing particles are observed using a scanning electron microscope, and the ratio of the number of aluminum-containing particles (B3) having satellite particles with a particle diameter of more than 5.0 μm and less than 10.0 μm to the total number of aluminum-containing particles observed is defined as the content of aluminum-containing particles (B3) having satellite particles with a particle diameter of more than 5.0 μm and less than 10.0 μm.

4. The aluminum-containing particles according to claim 1 or 2, wherein the content of the aluminum-containing particles (B) having satellite particles calculated by the <Method 1> is 90% or less.

5. D calculated by the following <Particle size measurement> ５０ The aluminum-containing particles according to claim 1 or 2, having a particle diameter of 30.0 μm or more and 60.0 μm or less. <Particle size measurement> 3.0 g of aluminum-containing particles were mixed with 40 mL of water and 10 mL of a surfactant with a concentration of 1.3%, and the mixture was dispersed in an ultrasonic bath for 300 seconds to obtain a measurement sample. The volume-based particle size distribution of the aluminum-containing particles was measured using a laser diffraction / scattering particle size measuring device, and D １０ Particle diameter, D ５０ Particle diameter, and D ９０ The particle size values ​​are obtained for each.

6. D calculated by the following <Particle size measurement> １０ The aluminum-containing particles according to claim 1 or 2, having a particle diameter of 20.0 μm or more and 40.0 μm or less. <Particle size measurement> 3.0 g of aluminum-containing particles were mixed with 40 mL of water and 10 mL of a surfactant with a concentration of 1.3%, and the mixture was dispersed in an ultrasonic bath for 300 seconds to obtain a measurement sample. The volume-based particle size distribution of the aluminum-containing particles was measured using a laser diffraction / scattering particle size measuring device, and D １０ Particle diameter, D ５０ Particle diameter, and D ９０ The particle size values ​​are obtained for each.

7. D calculated by the following <Particle size measurement> ９０ The aluminum-containing particles according to claim 1 or 2, having a particle diameter of 50.0 μm or more and 100.0 μm or less. <Particle size measurement> 3.0 g of aluminum-containing particles were mixed with 40 mL of water and 10 mL of a surfactant with a concentration of 1.3%, and the mixture was dispersed in an ultrasonic bath for 300 seconds to obtain a measurement sample. The volume-based particle size distribution of the aluminum-containing particles was measured using a laser diffraction / scattering particle size measuring device, and D １０ Particle diameter, D ５０ Particle diameter, and D ９０ The particle size values ​​are obtained for each.

8. The aluminum-containing particle according to claim 1 or 2, having a sphericity of 0.8 or more.

9. 3. The aluminum-containing particles according to claim 1, having an angle of repose measured by an injection method of 50.0° or less.

10. The aluminum-containing particle according to claim 1 or 2, having a fluidity of 15.0 sec / 50 g or less in a hole flow test according to JIS Z2502:2020.

11. The aluminum-containing particles according to claim 1 or 2, wherein the aluminum-containing particles comprise at least one selected from the group consisting of pure aluminum particles and aluminum-based alloy particles.

12. 12. The aluminum-containing particle according to claim 11, wherein the aluminum-based alloy particle contains at least one element selected from the group consisting of Cu, Mn, Si, Mg, Zn, and Ni.

13. 12. The aluminum-containing particle according to claim 11, wherein the aluminum-based alloy particle comprises at least one selected from the group consisting of an Al-Si-based alloy, an Al-Cu-based alloy, an Al-Mn-based alloy, an Al-Mg-based alloy, an Al-Si-Mg-based alloy, an Al-Si-Cu-based alloy, an Al-Zn-Mg-based alloy, an Al-Si-Mg-Cu-based alloy, an Al-Cu-Ni-Mg-based alloy, and an Al-Zn-Mg-Cu-based alloy.

14. 12. The aluminum-containing particle according to claim 11, wherein the aluminum-based alloy particle comprises at least one selected from the group consisting of AlSi10Mg and AlSi12.

15. The aluminum-containing particle according to claim 1 or 2, which can be used as a raw material powder for a 3D printer model.

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