A stainless steel slurry, a photocured metal member, and a method for manufacturing the same

Abstract

The present application belongs to the field of additive manufacturing of metal materials, and particularly relates to a stainless steel slurry, a photocured metal component and a preparation method thereof. The stainless steel slurry comprises a stainless steel alloy, a photosensitive resin, a photoinitiator and a dispersant; the photosensitive resin comprises 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl dipropyl acrylate, 2-hydroxyethyl methacrylate phosphate ester and trimethylolpropane triacrylate. The stainless steel slurry has high stability and low production cost, and the product prepared by 3D printing has high printing precision, printing quality and printing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of additive manufacturing metal materials, specifically relating to a stainless steel slurry, a photocurable metal component, and a method for preparing the same. Background Technology

[0002] Additive manufacturing is a molding method that rapidly manufactures complex parts using three-dimensional model data. Metal materials possess excellent mechanical strength, thermal conductivity, corrosion resistance, and electrical conductivity, making them widely used in machinery, automotive, aerospace, and medical fields. Currently, the most mature metal additive manufacturing process is selective laser melting (SLM). However, the powder requires high energy to completely melt, limiting the types of powders that can be printed. The process involves scanning from point to line and from line to surface using a high-energy laser beam. This process is time-consuming, and the equipment is expensive. Furthermore, the parts exhibit anisotropy under thermal stress, making them prone to defects and resulting in poor surface finish.

[0003] Compared to other molding processes, photopolymer 3D printing offers higher material utilization, greater design flexibility, better surface quality, higher printing precision, and the ability to manufacture complex structural parts with internal cavities or suspended structures. The principle of photopolymer 3D printing is that photosensitive resin is irradiated with ultraviolet light of a specific wavelength, causing cross-linking and polymerization, thus solidifying into a solid state. During the printing process, the ultraviolet-illuminated area within the printing region is controllable, allowing the irradiated areas to solidify while the unirradiated areas remain in a liquid state. However, in the photopolymerization process of metal slurries, the different refractive indices of the metal powder and polymer after ultraviolet irradiation affect the curing depth and efficiency, leading to printing difficulties, porosity, cracks, and other defects in the product, resulting in poor mechanical properties. Furthermore, the high density of metals makes the metal slurry prone to sedimentation, causing uneven metal powder distribution, affecting product consistency, and impacting the surface quality and precision of the printed product. While organic coating of metal powder can improve printing quality, its low solid content makes it difficult to achieve high density during subsequent sintering and densification.

[0004] Therefore, there is an urgent need to develop a stainless steel paste that can solve the problems of poor stability, low curing depth, and low printing quality of 3D printing metal pastes. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a stainless steel slurry, a photocurable metal component, and a method for preparing the same. The stainless steel slurry of this invention has high stability and low production cost, and the 3D printed products have high printing accuracy, printing quality, and printing efficiency.

[0006] Specifically, the present invention provides a stainless steel slurry, the stainless steel slurry comprising a stainless steel alloy, a photosensitive resin, a photoinitiator, and a dispersant; the photosensitive resin comprising 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate, 2-hydroxyethyl methacrylate phosphate, and trimethylolpropane triacrylate.

[0007] In one or more embodiments, the stainless steel alloy in the stainless steel slurry has a mass fraction of 70wt%-88wt%.

[0008] In one or more embodiments, the photosensitive resin in the stainless steel slurry has a mass fraction of 10wt%-25wt%.

[0009] In one or more embodiments, the photoinitiator in the stainless steel slurry has a mass fraction of 0.4wt%-3wt%.

[0010] In one or more embodiments, the mass fraction of the dispersant in the stainless steel slurry is 1wt%-4wt%.

[0011] In one or more embodiments, the particle size D50 of the stainless steel alloy is 10-100 μm.

[0012] In one or more embodiments, the stainless steel alloy is a 316L stainless steel alloy.

[0013] In one or more embodiments, the mass ratio of 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate to 2-hydroxyethyl methacrylate phosphate is 1:(0.6-1.2).

[0014] In one or more embodiments, the mass ratio of 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate to trimethylolpropane triacrylate is 1:(0.8-1.4).

[0015] In one or more embodiments, the stainless steel alloy in the stainless steel slurry has a mass fraction of 75wt%-85wt%.

[0016] In one or more embodiments, the photosensitive resin in the stainless steel slurry has a mass fraction of 12.75wt%-23wt%.

[0017] In one or more embodiments, the particle size D50 of the stainless steel alloy is 10-50 μm.

[0018] In one or more embodiments, the stainless steel alloy in the stainless steel slurry has a mass fraction of 77.5 wt% to 82.5 wt%.

[0019] In one or more embodiments, the photosensitive resin in the stainless steel slurry has a mass fraction of 15wt%-20wt%.

[0020] In one or more embodiments, the particle size D50 of the stainless steel alloy is 20-40 μm.

[0021] In one or more embodiments, the photoinitiator is selected from one or more of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, ethyl 2,4,6-trimethylbenzoylphosphonate, and 1-hydroxycyclohexylphenyl ketone.

[0022] In one or more embodiments, the dispersant is selected from one or more of BYK-102, BYK-180, BYK-9076, BYK-109, BYK-108, BYK-110 and BYK-333.

[0023] This invention provides a method for preparing the stainless steel slurry according to any embodiment of the invention, the method comprising the following steps: (1) Mix the photosensitive resin, photoinitiator and dispersant evenly to obtain a premixed solution; (2) Add the premixed liquid to the stainless steel alloy and ball mill it to obtain the ball milling intermediate; (3) Vacuum degassing treatment is performed on the ball mill intermediate to obtain stainless steel slurry.

[0024] In one or more embodiments, the ball milling speed is 200-1000 r / min.

[0025] In one or more embodiments, the mass ratio of the sum of the premixed liquid and the stainless steel alloy to the mass ratio of the grinding balls used in the ball mill is (1-10):1; In one or more embodiments, the ball milling time is 0.1-10 hours.

[0026] In one or more embodiments, the vacuum degassing rotation speed is 200-2000 r / min.

[0027] In one or more embodiments, the vacuum degassing time is 0.1-1 h.

[0028] The present invention provides photocurable metal components made using the stainless steel slurry described in any embodiment of the present invention.

[0029] The present invention provides a method for preparing photocurable metal components according to any embodiment of the present invention. The method includes the following steps: performing photocurable 3D printing processing on the stainless steel slurry of the present invention, and exposing and curing it layer by layer to obtain photocurable metal components.

[0030] In one or more embodiments, the light source intensity in the photopolymerization 3D printing process is 20,000-40,000 μm / cm. 2 .

[0031] In one or more embodiments, the light source wavelength in the photopolymerization 3D printing process is 380-405nm.

[0032] In one or more embodiments, the photopolymerization 3D printing process has a printing layer thickness of 10-30 μm.

[0033] In one or more embodiments, the exposure time in the photopolymerization 3D printing process is 1-20 seconds.

[0034] Compared with the prior art, the present invention has the following beneficial technical effects: (1) By rationally selecting the particle size of stainless steel alloy powder, the present invention improves the dispersion performance of powder in slurry and effectively enhances the stability of slurry; (2) By using a reasonable ratio of stainless steel alloy and photosensitive resin, the present invention further improves the mass fraction of powder and obtains a 3D printed photocurable preform with higher density; under the action of a reasonably selected photoinitiator and dispersant, the curing characteristics of the slurry are better, and the precision and molding effect of the printed products are better. Attached Figure Description

[0035] Figure 1 This is a magnified microscopic image of the honeycomb sample of the photocurable metal component prepared in Example 1 of the present invention.

[0036] Figure 2 This is a magnified microscopic image of the honeycomb sample of the photocurable metal component prepared in Example 2 of the present invention.

[0037] Figure 3 This is a magnified microscopic image of the honeycomb sample of the photocurable metal component prepared in Example 3 of the present invention.

[0038] Figure 4 This is a magnified microscopic image of the honeycomb sample of the photocurable metal component prepared in Comparative Example 2 of the present invention.

[0039] Figure 5 This is a magnified microscopic image of the honeycomb sample of the photocurable metal component prepared in Comparative Example 3 of the present invention.

[0040] Figure 6This is a magnified microscopic image of the honeycomb sample of the photocurable metal component prepared in Comparative Example 4 of the present invention. Detailed Implementation

[0041] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0042] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0043] In this document, the terms “contains,” “includes,” “containing,” and similar terms encompass the meanings of “basically composed of” and “composed of.” For example, when this document discloses “A contains B and C,” “A is basically composed of B and C” and “A is composed of B and C” should be considered as having been disclosed in this document.

[0044] In this document, all features defined in the form of numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0045] Unless otherwise specified, percentages refer to mass percentages and proportions refer to mass ratios in this article.

[0046] In this document, when describing embodiments or examples, it should be understood that it is not intended to limit the invention to those embodiments or examples. Rather, all alternatives, modifications, and equivalents of the methods and materials described herein are covered within the scope defined by the claims.

[0047] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0048] The stainless steel paste of this invention may comprise a stainless steel alloy, a photosensitive resin, a photoinitiator, and a dispersant. The photosensitive resin may comprise 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate, 2-hydroxyethyl methacrylate phosphate, and trimethylolpropane triacrylate. This invention reveals a synergistic effect among the above three photosensitive resins, which can effectively increase the cured thickness of the stainless steel paste and improve printing efficiency. The stainless steel paste containing the above photosensitive resin can achieve 3D printing with micro-nano level precision, and the printed products possess good integrity and molding performance.

[0049] In this invention, the mass ratio of 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate to 2-hydroxyethyl methacrylate phosphate can be 1:(0.6-1.2), for example 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1.0, 1:1.1, 1:1.2. The mass ratio of 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate to trimethylolpropane triacrylate can be 1:(0.8-1.4), for example 1:0.8, 1:0.9, 1:1.0, 1:1.1, 1:1.2, 1:1.3, 1:1.4. In this invention, the mass ratio of 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate, 2-hydroxyethyl methacrylate phosphate, and trimethylolpropane triacrylate is controlled at 1:(0.6-1.2):(0.8-1.4), which is beneficial to improving the curing thickness, printing efficiency, and printing accuracy of stainless steel slurry, and the printed products have good integrity and molding performance.

[0050] In the stainless steel slurry of this invention, the mass fraction of stainless steel alloy can be 70wt%-88wt%, preferably 75wt%-85wt%, more preferably 77.5wt%-82.5wt%, for example 77.5wt%, 78wt%, 78.5wt%, 79wt%, 79.5wt%, 80wt%, 80.5wt%, 81wt%, 81.5wt%, and 82wt%. In this invention, controlling the amount of stainless steel powder within the above-mentioned more preferred range is beneficial in two ways: firstly, considering the influence of slurry viscosity on the printing process, reducing printing defects, and ensuring printing quality and surface accuracy; secondly, increasing the mass fraction of stainless steel powder is beneficial to improving the density of the printed product blank, thereby affecting the final performance of the printed part. In the stainless steel slurry of this invention, the mass fraction of photosensitive resin can be 10wt%-25wt%, preferably 12.75wt%-23wt%, more preferably 15wt%-20wt%, for example 15wt%, 16wt%, 17wt%, 18wt%, 19wt%, and 20wt%. In this invention, photosensitive resin is the main component of the binder. Controlling the mass fraction of the photosensitive resin within the aforementioned preferred range ensures the viscosity and curing performance of the slurry and also significantly affects the mechanical properties of the printed parts. In the stainless steel slurry of this invention, the mass fraction of the photoinitiator can be 0.4wt%-3wt%, for example, 1.0wt%, 1.5wt%, 2.0wt%, 2.5wt%, or 3wt%. In this invention, the photoinitiator absorbs ultraviolet light energy to rapidly generate free radicals in a localized area, initiating cross-linking and curing of the photosensitive monomer or resin. Its addition amount determines the curing depth and speed of the slurry; therefore, controlling the amount of photoinitiator within the aforementioned range is beneficial for improving curing performance. In the stainless steel slurry of this invention, the mass fraction of the dispersant can be 1wt%-4wt%, for example, 1.0wt%, 1.5wt%, 2.0wt%, 2.5wt%, 3.0wt%, 3.5wt%, or 4wt%. In this invention, the addition of a dispersant is to ensure a more uniform distribution of metal powder in the slurry, guaranteeing the stability and rheological properties of the stainless steel slurry, preventing particle sedimentation or agglomeration. Controlling the mass fraction of the dispersant within the aforementioned preferred range allows the printed parts to achieve good surface quality and precision. Through the rational selection of the particle size of the stainless steel pre-alloyed powder and precise component ratio design, printed parts with high printing precision, good surface quality, few defects, and high density are obtained. This invention controls the content of stainless steel alloy, photosensitive resin, photoinitiator, and dispersant within the aforementioned range, resulting in a stainless steel slurry with moderate viscosity and good curing depth. Using this stainless steel slurry is beneficial for obtaining products with high precision and good integrity in 3D printing. Controlling the content of stainless steel alloy, photosensitive resin, photoinitiator, and dispersant within the aforementioned preferred or more preferred range can further improve the obtaining of products with high precision and good integrity in 3D printing.

[0051] It is understood that the stainless steel alloy in the stainless steel slurry of this invention is in powder form. In this invention, the particle size D50 of the stainless steel alloy can be 10-100 μm, preferably 10-50 μm, more preferably 20-40 μm, for example 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, and 100 μm. In this invention, excessively large particle sizes of the stainless steel alloy are detrimental to 3D printing, while smaller particle sizes make the stainless steel powder more prone to agglomeration. In this invention, controlling the particle size D50 of the stainless steel alloy within the aforementioned more preferred range is beneficial for reducing the viscosity of the stainless steel slurry, allowing the metal particles to be more uniformly dispersed in the resin, which is conducive to obtaining products with high precision and good integrity in 3D printing. In this invention, the stainless steel alloy can be 316L stainless steel alloy. In some embodiments, the composition of commercial 316L stainless steel alloy, by weight percentage, meets the following requirements: Cr: 16-18%, Ni: 10-14%, Mo: 2-3%, C≤0.03%, O≤0.06%, Si≤1.0%, Mn≤2.0%, with the balance including Fe and unavoidable impurities. In some embodiments, the balance is Fe and unavoidable impurities.

[0052] In this invention, the photoinitiator can be one or more selected from phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, ethyl 2,4,6-trimethylbenzoylphosphonate, and 1-hydroxycyclohexylphenyl ketone. In this invention, the dispersant can be one or more selected from BYK-102, BYK-180, BYK-9076, BYK-109, BYK-108, BYK-110, and BYK-333. The addition of the dispersant in this invention enables the stainless steel slurry to possess good rheological properties during the printing process, resulting in a stainless steel slurry with good curing properties.

[0053] The method for preparing stainless steel slurry according to the present invention includes the following steps: (1) mixing photosensitive resin, photoinitiator, and dispersant evenly to obtain a premix; (2) adding the premix to a stainless steel alloy and ball milling to obtain a ball-milled intermediate; (3) subjecting the ball-milled intermediate to vacuum degassing to obtain stainless steel slurry. The present invention promotes the uniform distribution of stainless steel powder within the stainless steel slurry through ball milling and vacuum degassing, thereby improving the stability of the stainless steel slurry. The stainless steel slurry of the present invention exhibits high surface precision and complete sample integrity after photopolymerization and 3D printing.

[0054] In this invention, the ball milling speed can be 200-1000 r / min, for example, 200 r / min, 300 r / min, 400 r / min, 500 r / min, 600 r / min, 700 r / min, and 800 r / min. Controlling the ball milling speed within this range allows for effective collision and shear force between the metal powder and the resin slurry, thereby promoting thorough dispersion of the slurry and reducing agglomeration. In this invention, the ratio of the sum of the mass of the premix and the stainless steel alloy to the mass of the grinding balls used in the ball mill can be (1-10):1, for example, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, and 10:1. In this invention, the ball-to-material ratio refers to the ratio of the sum of the mass of the premix and the stainless steel alloy to the mass of the grinding balls used in the ball mill. In this invention, controlling the ball-to-powder ratio within the aforementioned range is beneficial for ensuring sufficient dispersion of the metal powder in the resin slurry, reducing agglomeration, and resulting in uniform distribution of metal particles in the slurry. Furthermore, a reasonable ball-to-powder ratio significantly impacts the subsequent removal of the slurry from the ball mill jar. If the ball-to-powder ratio is too low, the slurry dispersion is insufficient, leading to poor slurry stability; if the ball-to-powder ratio is too high, the slurry viscosity is high, making it difficult to obtain a large quantity of slurry and significantly increasing costs. In this invention, the ball milling time can be 0.1-10 hours, for example, 0.5 hours, 1 hour, 2 hours, 4 hours, 6 hours, 8 hours, or 10 hours. Controlling the ball milling time within the aforementioned range in this invention is beneficial for ensuring sufficient dispersion of the metal powder in the resin slurry, reducing agglomeration, and resulting in uniform distribution of metal particles in the slurry.

[0055] In this invention, the vacuum degassing speed can be 200-2000 r / min, for example, 200 r / min, 400 r / min, 600 r / min, 800 r / min, 1000 r / min, 1200 r / min, 1400 r / min, 1600 r / min, 1800 r / min, and 2000 r / min. In this invention, excessively high vacuum degassing speeds can generate high energy, potentially causing the slurry to solidify. Therefore, controlling the vacuum degassing speed within the aforementioned range is beneficial for obtaining a uniform stainless steel slurry. In this invention, the vacuum degassing time can be 0.1-1 h, for example, 0.1 h, 0.2 h, 0.3 h, 0.4 h, 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, and 1.0 h. In this invention, excessively long vacuum degassing times can generate high energy, potentially causing the slurry to solidify. Therefore, controlling the vacuum degassing time within the aforementioned range is beneficial for obtaining a uniform stainless steel slurry. The vacuum degassing in this invention is performed under vacuum conditions, effectively absorbing air bubbles in the slurry and preventing defects such as pores and voids during subsequent printing.

[0056] This invention provides a photocurable metal component made using the stainless steel slurry of this invention.

[0057] This invention provides a method for preparing photocurable metal components of this invention, the method comprising the following steps: performing photocurable 3D printing on the stainless steel slurry of this invention, and exposing and curing layer by layer to obtain photocurable metal components.

[0058] In this invention, the light source intensity for photopolymer 3D printing can be 20,000-40,000 μm / cm. 2 For example, 20000μm / cm 2 25000μm / cm 2 30000μm / cm 2 35000μm / cm 2 40000μm / cm 2 In this invention, the wavelength of the light source for photopolymer 3D printing can be 380-405nm, for example, 380nm, 385nm, 390nm, 395nm, 400nm, or 405nm. The thickness of the printed layer in this invention can be 10-30μm, for example, 10μm, 15μm, 20μm, 25μm, or 30μm. The exposure time for this invention can be 1-20s, for example, 2s, 4s, 6s, 8s, 10s, 12s, 14s, 16s, 18s, or 20s.

[0059] The present invention will be described below by way of specific embodiments. It should be understood that these embodiments are merely illustrative and are not intended to limit the scope of the invention. The methods, reagents, and materials used in the embodiments are conventional methods, reagents, and materials in the art, unless otherwise stated. The raw material compounds in the embodiments are all commercially available.

[0060] Example 1

[0061] The specific steps for preparing the stainless steel slurry in this embodiment are as follows: (1) Weigh 85wt% of photosensitive resin (a mixture of 30wt% 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate, 30wt% 2-hydroxyethyl methacrylate phosphate and 40wt% trimethylolpropane triacrylate), 10wt% of dispersant BYK-333 and 5wt% of photoinitiator diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, put it into a vacuum jar, place the vacuum jar in a homogenizer, and mix for 1h at 800rpm under vacuum to obtain a premixed solution; (2) Weigh 85wt% 316L stainless steel alloy powder (D50 is 50μm) and put it into a ball mill jar. Gradually and slowly add 15wt% premixed liquid to the 316L stainless steel alloy powder to mix and obtain ball mill intermediate. The ball milling speed is 400r / min, the ball milling time is 4h, and the ball-to-material ratio (the sum of the mass of the premixed liquid and the stainless steel alloy and the mass of the grinding balls used in the ball mill) is 3:1. (3) The ball mill intermediate was taken out and transferred to a vacuum tank for degassing treatment to obtain stainless steel slurry. The homogeneous vacuum degassing speed was 1000 r / min and the vacuum degassing time was 20 min.

[0062] (4) The stainless steel slurry was subjected to photocuring 3D printing, with each layer exposed and cured. The light source intensity was 30000 μm / cm. 2 The light source wavelength was 380nm, the printing layer thickness was 30μm, and the exposure time was 16s to obtain a photocured metal component.

[0063] Example 2

[0064] The specific steps for preparing the stainless steel slurry in this embodiment are as follows: (1) Weigh 89wt% of photosensitive resin (a mixture of 30wt% 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-22-dimethylpropyl diacrylate, 30wt% 2-hydroxyethyl methacrylate phosphate and 40wt% trimethylolpropane triacrylate), 8wt% of dispersant BYK-333 and 3wt% of photoinitiator diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, put them into a vacuum jar, place the vacuum jar in a homogenizer, and mix for 1h at 1000rpm under vacuum to obtain a premixed solution; (2) Weigh 80wt% of 316L stainless steel alloy powder (D50 is 30μm) and put it into a ball mill jar. Gradually and slowly add 20wt% of premixed liquid to the 316L stainless steel alloy powder to mix and obtain ball mill intermediate. The ball milling speed is 600r / min, the ball milling time is 6h, and the ball-to-material ratio (the sum of the mass of the premixed liquid and the stainless steel alloy and the mass of the grinding balls used in the ball mill) is 3.5:1. (3) The ball mill intermediate was taken out and transferred to a vacuum tank for degassing treatment to obtain stainless steel slurry. The homogeneous vacuum degassing speed was 1500 r / min and the vacuum degassing time was 15 min.

[0065] (4) The stainless steel slurry is subjected to photopolymerization 3D printing treatment, and the light source is exposed and cured layer by layer with an intensity of 28000μm / cm. 2 The light source wavelength was 380nm, the printing layer thickness was 25μm, and the exposure time was 14s to obtain a photocured metal component.

[0066] Example 3

[0067] The specific steps for preparing the stainless steel slurry in this embodiment are as follows: (1) Weigh 92wt% photosensitive resin (a mixture of 30wt% 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate, 30wt% 2-hydroxyethyl methacrylate phosphate and 40wt% trimethylolpropane triacrylate), 5wt% dispersant BYK-333 and 3wt% photoinitiator diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, put it into a vacuum jar, place the vacuum jar in a homogenizer, and mix for 1h at 1500rpm under vacuum to obtain a premixed solution; (2) Weigh 75wt% 316L stainless steel alloy powder (D50 is 10μm) and put it into a ball mill jar. Gradually and slowly add 25wt% premixed liquid to the 316L stainless steel alloy powder to mix and obtain ball mill intermediate. The ball milling speed is 600r / min, the ball milling time is 2h, and the ball-to-material ratio (the sum of the mass of the premixed liquid and the stainless steel alloy and the mass of the grinding balls used in the ball mill) is 5:1. (3) The ball mill intermediate was taken out and transferred to a vacuum tank for degassing treatment to obtain stainless steel slurry. The homogeneous vacuum degassing speed was 2000 r / min and the vacuum degassing time was 15 min.

[0068] (4) The stainless steel slurry is subjected to photocuring 3D printing treatment, and the light source is exposed and cured layer by layer with an intensity of 25000μm / cm. 2 The light source wavelength is 380nm, the printing layer thickness is 20μm, and the exposure time is 15s to obtain a photocured metal component.

[0069] Comparative Example 1

[0070] The conditions for this comparative example are the same as those for Example 2, except that the photosensitive resin in this comparative example is a mixture of 40wt% 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate, 30wt% 2-hydroxyethyl methacrylate phosphate, and 30wt% trimethylolpropane triacrylate.

[0071] Comparative Example 2

[0072] The other conditions in this comparative example are the same as those in Example 2, except that the ball milling time in this comparative example is 2 hours.

[0073] Comparative Example 3

[0074] The conditions for this comparative example are the same as those for Example 2, except that the photosensitive resin in this comparative example is a mixture of 30 wt% laurate methacrylate, 30 wt% 2-hydroxyethyl methacrylate phosphate and 40 wt% trimethylolpropane triacrylate.

[0075] Comparative Example 4

[0076] The conditions for this comparative example are the same as those for Example 2, except that the photosensitive resin in this comparative example is a mixture of 50 wt% 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate and 50 wt% trimethylolpropane triacrylate.

[0077] Test case

[0078] Viscosity test: At 40℃, the viscosity of the stainless steel slurries prepared in Examples 1-3 and Comparative Examples 1-4 at different rotation speeds was tested using a digital viscometer. The viscosity of the stainless steel slurries prepared in Examples 1-3 and Comparative Examples 1-2 at a rotation speed of 60 rpm was compared, and the results are shown in Table 1.

[0079] Curing depth test: at a light source power of 30000μw / cm 2 Under the conditions, the stainless steel ceramic slurries prepared in Examples 1-3 and Comparative Examples 1-4 were scanned for 15 seconds using a 380nm light source to form corresponding solidified monolayers. The thickness of the monolayers was measured using a micrometer screw gauge, and the results are shown in Table 1.

[0080] Table 1: Viscosity, curing depth, and printing performance of stainless steel slurries prepared in Examples 1-3 and Comparative Examples 1-4 .

Claims

1. A stainless steel slurry, characterized in that, The stainless steel slurry comprises a stainless steel alloy, a photosensitive resin, a photoinitiator, and a dispersant; the photosensitive resin comprises 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate, 2-hydroxyethyl methacrylate phosphate, and trimethylolpropane triacrylate; the mass ratio of 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate to 2-hydroxyethyl methacrylate phosphate is 1:(0.6-1.2); the mass ratio of 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl diacrylate to trimethylolpropane triacrylate is 1:(0.8-1.4).

2. The stainless steel slurry according to claim 1, characterized in that, The stainless steel slurry has one or more of the following characteristics: In the stainless steel slurry, the mass fraction of the stainless steel alloy is 70wt%-88wt%. In the stainless steel slurry, the mass fraction of the photosensitive resin is 10wt%-25wt%; In the stainless steel slurry, the mass fraction of the photoinitiator is 0.4wt%-3wt%; In the stainless steel slurry, the mass fraction of the dispersant is 1wt%-4wt%; The particle size D of the stainless steel alloy 50 10-100μm; The stainless steel alloy is 316L stainless steel alloy.

3. The stainless steel slurry according to claim 1, characterized in that, The stainless steel slurry has one or more of the following characteristics: In the stainless steel slurry, the mass fraction of the stainless steel alloy is 75wt%-85wt%. In the stainless steel slurry, the mass fraction of the photosensitive resin is 12.75wt%-23wt%. The particle size D of the stainless steel alloy 50 It is 10-50μm.

4. The stainless steel slurry according to claim 1, characterized in that, The stainless steel slurry has one or more of the following characteristics: In the stainless steel slurry, the mass fraction of the stainless steel alloy is 77.5 wt%-82.5 wt%. In the stainless steel slurry, the mass fraction of the photosensitive resin is 15wt%-20wt%; The particle size D of the stainless steel alloy 50 It is 20-40μm.

5. The stainless steel slurry according to claim 1, characterized in that, The photoinitiator is selected from one or more of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, ethyl 2,4,6-trimethylbenzoylphosphonate, and 1-hydroxycyclohexylphenyl ketone; and / or The dispersant is selected from one or more of BYK-102, BYK-180, BYK-9076, BYK-109, BYK-108, BYK-110 and BYK-333.

6. A method for preparing the stainless steel slurry according to any one of claims 1-5, characterized in that, The method includes the following steps: (1) Mix the photosensitive resin, photoinitiator and dispersant evenly to obtain a premixed solution; (2) Add the premixed liquid to the stainless steel alloy and ball mill it to obtain the ball milling intermediate; (3) Vacuum degassing treatment is performed on the ball mill intermediate to obtain stainless steel slurry.

7. The method according to claim 6, characterized in that, The method has one or more of the following characteristics: The ball milling speed is 200-1000 r / min; The mass ratio of the sum of the premixed liquid and the stainless steel alloy to the mass of the grinding balls used in the ball mill is (1-10):1; The ball milling time is 0.1-10 hours; The rotation speed of the vacuum degassing is 200-2000 r / min; The vacuum degassing time is 0.1-1h.

8. A photocurable metal component, characterized in that, The photocurable metal component is made from the stainless steel slurry according to any one of claims 1-5.

9. A method for preparing the photocurable metal component of claim 8, characterized in that, The method includes the following steps: performing photocuring 3D printing on the stainless steel slurry according to any one of claims 1-5, and exposing and curing it layer by layer to obtain a photocured metal component.

10. The method as described in claim 9, characterized in that, The method has one or more of the following characteristics: In the aforementioned photopolymerization 3D printing process, the light source wavelength is 380-405nm; In the aforementioned photopolymerization 3D printing process, the printing layer thickness is 10-30μm; In the aforementioned photopolymerization 3D printing process, the exposure time is 1-20 seconds.

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