Stereolithography paste for manufacturing metal parts and use thereof

Abstract

The application discloses a stereolithography paste for manufacturing metal parts and application thereof, and relates to the technical field of additive manufacturing. The stereolithography paste comprises 90-98.9% of composite metal powder, 1-9.9% of photopolymerization prepolymer and 0.1-1% of photoinitiator by mass fraction. The composite metal powder is prepared by coating a layer of PVP film on the surface of metal powder particles. The photopolymerization prepolymer is at least two kinds of acrylate monomers with different functional groups. The application further provides a method for manufacturing metal parts by using the above stereolithography paste. The stereolithography paste can achieve a stereolithography curing depth of 30-80 microns, and the formed green body can be sintered into a high-surface-quality part after being degreased.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and in particular to a method for preparing a stereolithographic paste for manufacturing metal parts. Background Technology

[0002] As is well known, titanium or titanium alloys possess excellent mechanical properties, high corrosion resistance, low Young's modulus, low density, and good biocompatibility. These properties enable titanium or titanium alloys to meet the specific needs of many fields, such as wearable consumer electronics, aerospace, aviation, or other medical applications, particularly prosthetics.

[0003] In existing technologies, titanium or titanium alloy parts are obtained through additive manufacturing using selective laser melting (SLM). From an industrial perspective, this is one of the most mature technologies. However, like any melt 3D printing technology, this technology has the following drawbacks: (1) Due to the high-temperature melting layer by layer, residual stress exists in the parts, requiring subsequent heat treatment after manufacturing; (2) Poor surface quality, and high surface quality requirements (such as a surface finish of 5 μm) cannot be achieved in subsequent surface treatments (such as polishing); (3) The specific particle size distribution requirements of the powder make the raw material cost considerable; (4) Specific safety and health precautions are required in the polishing and powder grading steps.

[0004] In recent years, the technology of additive manufacturing of titanium or titanium alloy parts by binder jetting (BJ) has gradually matured. However, due to the reactivity of titanium metal powder, additional investment is required in terms of safety assurance. Moreover, in the production of thin-walled high-precision parts, the low strength of the green blank makes it difficult to control sintering crack deformation.

[0005] To address the aforementioned issues, a technique for fabricating metal parts using photolithography (SLA, or Digital Light Processing, DLP) has been developed. This technique involves depositing a paste containing metal powder, photopolymerizable resin, and a photoinitiator onto a support platform. Polymerization is then generated by selectively irradiating one or more areas of this layer with ultraviolet light (e.g., 365 nm / 385 nm / 405 nm). A second layer is then layered on top of the first, and the process is repeated using the same principle until the desired three-dimensional polymer is formed.

[0006] In fact, metal powders have a strong ability to absorb ultraviolet light. The absorption of ultraviolet light by the powder competes with the initiator in the formulation, preventing the cross-linking of the photosensitive resin. Due to the blocking of light by the powder, ultraviolet light cannot reach a greater depth. Since the refractive index of the photosensitive resin (usually acrylic resin) is around 1.5, which is 2-3 times lower than that of some metal powders, the powder acts as a converging lens in the paste, limiting the diffusion of light and reducing the reactivity of the resin.

[0007] To enhance the reactivity of pastes, one or more specific compounds can be added to modify the optical properties of the powder and the behavior of the paste under ultraviolet radiation. Existing technologies disclose pastes comprising a binder composed of at least one photopolymer resin with a viscosity of 3000-7000 mpas, a photoinitiator, or a metal powder. The metal powder can be stainless steel, titanium, nickel, or titanium alloy. To improve the reactivity of the paste, polyethylene or polyamide can be added. Some reports disclose the use of photopolymer components, photoinitiators, and copper metal powder to manufacture copper parts via stereolithography. Since light cannot penetrate deep into the metal paste, only the surface components polymerize. To compensate for this shortcoming, 5% Triton-X dispersant is added to the composition to promote light penetration and diffusion, thereby improving reactivity and allowing for the desired polymerization depth. Some reports disclose the use of high-refractive-index photosensitive monomers or oligomers to improve the curing depth of the paste; however, because gas channels are not easily formed during deesterification, cracking is likely to occur. Some reports also disclose the addition of appropriate optical additives, such as polypropylene, to the paste to improve the depth of light penetration. This method poses a challenge to the uniform dispersion of the additives; if the dispersion is uneven, the degree of photocuring of the green body will vary, leading to inconsistent density distribution or shrinkage deformation in the final metal parts.

[0008] It is evident that existing technologies for manufacturing metal parts using photolithography (SLA / DLP) all have various problems. Summary of the Invention

[0009] This invention provides a stereolithography paste for manufacturing metal parts, its preparation method, and its application. By coating the surface of metal powder particles with a PVP film and using a specific photopolymer prepolymer, the stereolithography paste exhibits significant improvements in UV curing depth, slurry stability, and stability in subsequent deesterification and sintering processes. This invention is specifically achieved through the following techniques.

[0010] A stereolithography paste for manufacturing metal parts comprises, by mass fraction, 90-98.9% composite metal powder, 1-9.9% photopolymer prepolymer and 0.1-1% photoinitiator;

[0011] The composite metal powder is prepared by coating the surface of metal powder particles with a PVP film; the photopolymer prepolymer is at least two acrylate monomers with different functional groups.

[0012] The stereolithography paste prepared by this invention has a reactivity of less than 10 s and can obtain a cross-linked layer of 30 μm-80 μm within 1 s-5 s. Therefore, it overcomes the problems of low printing efficiency caused by the low curing depth (20-30 μm) of existing stereolithography pastes, as well as the low yield of the final product due to uneven photocuring. Compared with selective laser melting (SLM) and binder jetting (BJ), the printing efficiency is comparable. However, SLM suffers from surface roughness of more than 10 μm due to the limitation of laser spot diameter and the difference in laser melting power distribution on the powder surface, making it difficult to achieve the high requirement of less than 5 μm. BJ technology suffers from low yield due to cracking and other difficulties in the printing of thin-walled parts, which is limited by the strength of the green blank. The stereolithography paste provided by this application overcomes the above-mentioned shortcomings of both, and the surface roughness of the product can reach 3 μm. Due to the high photocuring strength, it performs excellently in the printing of thin-walled parts.

[0013] The stereolithography paste prepared by this invention is obtained by mixing one or more viscous or liquid acrylate monomers and / or oligomers with a photoinitiator and composite metal powder, which ensures the uniformity of the paste. Compared with SLM and BJ, the number of powder handling steps is reduced, and the ecological and health risks associated with powder handling are also significantly reduced.

[0014] In the preparation of composite metal powders, polyvinylpyrrolidone (PVP) exhibits excellent performance in photocuring systems due to its unique chemical structure and physical properties. The polar groups and steric hindrance of PVP make the paste system more stable and less prone to sedimentation; it also has good compatibility with photocurable monomers and oligomers; the reflection and refraction effects of the PVP film surface allow ultraviolet light to penetrate deeper.

[0015] When metal powder particles are coated with PVP film, the stereolithography paste exhibits significant improvements in UV curing depth, slurry stability, and stability of subsequent deesterification and sintering processes.

[0016] The mass ratio of composite metal powder and photopolymer mixture can be adjusted according to the mechanical properties required for the metal parts.

[0017] Furthermore, the particle size of the composite metal powder is 10-30 μm, and the thickness of the PVP film is 20-100 nm.

[0018] Furthermore, the PVP membrane uses PVP with a molecular weight of 30,000-1,000,000.

[0019] Furthermore, the metal powder is pure titanium, titanium alloy, or pure copper powder.

[0020] Furthermore, the photopolymer prepolymer is one or more of isobornyl acrylate (IBOA), hexanediol diacrylate, trimethylolpropane triacrylate (TMPTA), ethoxybisphenol A dimethacrylate (BPA4EODMA), and difunctional polyurethane acrylate (CN509).

[0021] In the aforementioned photopolymer prepolymer, the monofunctional monomer isobornyl acrylate (IBOA) and the difunctional monomer hexanediol diacrylate are small molecule compounds that are easily volatile and form deesterification microchannels; the trifunctional monomers trimethylolpropane triacrylate (TMPTA), as well as the high molecular weight monomers ethoxybisphenol A dimethacrylate (BPA4EODMA) and the acrylate oligomer difunctional polyurethane acrylate (CN509) act as the green body skeleton.

[0022] The acrylate monomers selected in the stereolithography paste of this invention include two types of resin monomers. One type is acrylic resin that serves as the backbone, providing support for the part after deesterification; examples include polyurethane acrylate (EM3261), epoxy acrylate, and polyether acrylate. The other type is resin monomers that are easily volatile during deesterification, which helps to increase the deesterification speed and avoid cracking due to expansion during deesterification; examples include monofunctional acrylates (isobornyl acrylate IBOA).

[0023] Further, the photoinitiator is one or more of diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (819), 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), and 2-isopropylthioxanthone (ITX).

[0024] The present invention also provides an application of a stereolithography paste for manufacturing metal parts, wherein the raw materials of the stereolithography paste are mixed evenly, stereolithography is performed to form a green blank, and the green blank is deesterified and sintered to form a finished metal part.

[0025] Furthermore, the thickness of the stereolithography is 30-80 μm.

[0026] Compared with the prior art, the advantages of the present invention are: the stereolithography paste provided by the present invention for manufacturing metal parts has a uniformly dispersed paste slurry system and a high-efficiency printing curing depth; it easily forms good de-esterification channels, ensuring the yield of de-esterification sintering of printed parts; the paste slurry system has good storage stability and is not easy to settle, ensuring the consistency of printed parts. Attached Figure Description

[0027] Figure 1 The graph shows the relationship between curing depth (vertical axis) and exposure time (horizontal axis) for the examples and comparative examples using photolithography SLA process.

[0028] Figure 2 The graph shows the relationship between curing depth (vertical axis) and exposure time (horizontal axis) for the examples and comparative examples using the DLP photolithography process. Detailed Implementation

[0029] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In some embodiments of the present invention, the provided stereolithography paste comprises, by mass fraction, 90-98.9% composite metal powder, 1-9.9% photopolymer prepolymer and 0.1-1% photoinitiator.

[0031] Among them, the composite metal powder is prepared by coating the surface of metal powder particles with a PVP film; the photopolymer prepolymer is at least two acrylate monomers with different functional groups.

[0032] Optionally, in the above-mentioned stereolithography paste, the particle size of the composite metal powder is 10-30 μm, and the thickness of the PVP film is 20-100 nm.

[0033] Optionally, the PVP membrane uses PVP with a molecular weight of 30,000-1,000,000.

[0034] Optionally, the metal powder is pure titanium, titanium alloy, or pure copper powder.

[0035] Optionally, the photopolymer prepolymer is one or more of isobornyl acrylate, hexanediol diacrylate, trimethylolpropane triacrylate, ethoxybisphenol A dimethacrylate, and difunctional polyurethane acrylate.

[0036] Optionally, the photoinitiator is one or more of diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 2-isopropylthioxanthraquinone (ITX).

[0037] The raw material procurement and equipment information used in the following specific implementation cases are shown in Table 1 below.

[0038] Table 1 Raw Material Procurement Information

[0039]

[0040] Example 1

[0041] The stereolithography paste provided in this embodiment comprises, by mass fraction, 90% composite metal powder, 9.5% photopolymer prepolymer and 0.5% photoinitiator.

[0042] The composite metal powder is a titanium alloy powder Ti-6AL-4V coated with PVP K30. The photopolymer prepolymer consists of monofunctional acrylate reactive diluent IBOA (2.7% of the total mass of the stereolithography paste), trifunctional acrylate reactive diluent TMPTA (5% of the total mass of the stereolithography paste), and polyurethane acrylate EM3261 (1.8% of the total mass of the stereolithography paste). The photoinitiator is 1173.

[0043] The composite metal powder (i.e., titanium alloy powder coated with PVP K30) used in this embodiment was prepared as follows: PVP-K30 was added to a solution to prepare a coating solution (containing 75% water, 12% triethylene glycol, 5% 1,2-hexanediol, 3% nonionic surfactant Tego Wet500, and 5% PVP by mass fraction). This coating solution was mixed with titanium alloy powder at a mass ratio of 1:99, thoroughly stirred and impregnated, and then baked at 150°C for 2 hours to obtain a composite metal powder with a PVP-K30 to titanium alloy powder Ti-6AL-4V mass ratio of 0.51:100 and a thickness of 90 nm.

[0044] The method for preparing the stereolithography paste in this embodiment is as follows:

[0045] PVP K30-coated titanium alloy powder Ti-6AL-4V (particle size 20 μm) was added to a liquid mixture of photopolymer prepolymers (IBOA, TMPTA, and EM3261) and a photoinitiator. The mixture was dispersed at high speed at 40°C until homogeneous, and then stirred into a slurry. This slurry was then milled three times using a sand mill to obtain a paste with a viscosity of 3000-4000 mpas. This paste exhibits good thixotropic properties, which is beneficial for forming thin layers in stereolithography.

[0046] The method for preparing metal parts using the stereolithography paste in this embodiment is as follows: the stereolithography paste is subjected to SLA stereolithography (laser power 3 W, layer thickness 60 μm, scanning speed 4000 mm / s); the resulting green blank is degreased at 650-700℃ and then sintered at 1200-1300℃ to obtain a dense metal part with a surface finish of 5 μm.

[0047] Example 2

[0048] The stereolithography paste provided in this embodiment comprises, by volume, 95% composite metal powder, 4.5% photopolymer prepolymer and 0.5% photoinitiator.

[0049] The composite metal powder is pure copper powder (particle size 20 μm) coated with PVP K30. The photopolymer prepolymer consists of monofunctional acrylate reactive diluent IBOA (2.2% of the total mass of the stereolithography paste), trifunctional acrylate reactive diluent TMPTA (1.5% of the total mass of the stereolithography paste), and difunctional polyurethane acrylate CN509 (0.8% of the total mass of the stereolithography paste). The photoinitiator is 819.

[0050] The preparation methods for PVP K30-coated pure copper powder and stereolithography paste are the same as those in Example 1.

[0051] The method for preparing metal parts using the stereolithography paste in this embodiment is as follows: the stereolithography paste is subjected to DLP stereolithography (10000mJ / cm). 2 (40 μm layer thickness, 6 s exposure time); the resulting green body is degreased at 650-700℃ and then sintered at 1200-1300℃ to obtain a dense metal part with a surface finish of 4 μm.

[0052] Example 3

[0053] The stereolithography paste provided in this embodiment comprises, by mass fraction, 95% composite metal powder, 4.5% photopolymer prepolymer and 0.5% photoinitiator.

[0054] The composite metal powder (i.e., titanium alloy powder coated with PVP K30) used in this embodiment is prepared as follows: PVP-K30 is added to a solution to prepare a coating solution (containing 80% water, 10% triethylene glycol, 5% 1,2-hexanediol, 3% nonionic surfactant Tego Wet500, and 7% PVP by mass fraction). The coating solution is mixed with titanium alloy powder at a mass ratio of 1:99, thoroughly stirred and impregnated, and then baked at 150 degrees Celsius for 2 hours to obtain a composite metal powder with a mass ratio of 0.65% and a thickness of 110 nm.

[0055] PVP K30-coated titanium alloy powder Ti-6AL-4V (particle size 15μm) was added to a liquid mixture of photopolymer prepolymers (IBOA, TMPTA, and CN964) and a photoinitiator. The mixture was then dispersed at high speed at 40°C to form a slurry, which was subsequently milled three times using a sand mill to obtain a paste with a viscosity of 3000-4000 mpas. This paste exhibits good thixotropic properties, which is beneficial for forming thin layers in stereolithography.

[0056] The method for preparing metal parts using the stereolithography paste in this embodiment is as follows: the stereolithography paste is subjected to SLA stereolithography (laser power 1 W, layer thickness 50 μm, scanning speed 4000 mm / s); the resulting green blank is degreased at 650-700℃ and then sintered at 1200-1300℃ to obtain a dense metal part with a surface finish of 5 μm.

[0057] Example 4

[0058] The stereolithography paste provided in this embodiment comprises, by weight, 95% composite metal powder, 4.5% photopolymer prepolymer and 0.5% photoinitiator.

[0059] The composite metal powder is pure copper powder (particle size 20 μm) coated with PVP K30. The photopolymer prepolymer consists of monofunctional acrylate reactive diluent IBOA (2.2% of the total mass of the stereolithography paste), trifunctional acrylate reactive diluent TMPTA (1.5% of the total mass of the stereolithography paste), and polyurethane acrylate CN964 (0.8% of the total mass of the stereolithography paste). The photoinitiator is 819.

[0060] The preparation method of PVP K30 coated pure copper powder and the preparation method of stereolithography paste are the same as those in Example 1, except that titanium alloy powder is replaced with copper powder.

[0061] The method for fabricating metal parts using the stereolithography paste in this embodiment is as follows: the stereolithography paste is subjected to DLP stereolithography (10000 mJ / cm). 2 (The layer thickness is 50 μm and the exposure time is 6 s). The resulting green body is degreased at 650-700℃ and then sintered at 1200-1300℃ to obtain a dense metal part with a surface finish of 4 μm.

[0062] Comparative Example 1

[0063] The stereolithography paste provided in this comparative example comprises, by mass, 90% metal powder, 9.5% photopolymer prepolymer and 0.5% photoinitiator.

[0064] The metal powder used was titanium alloy powder (particle size 15 μm). The preparation method of the stereolithography paste was the same as in Example 1.

[0065] The method for preparing the stereolithography paste is as follows: Titanium alloy powder Ti-6AL-4V (particle size 15µm) is added to a liquid mixture of photopolymer prepolymers (IBOA, TMPTA, and CN964) and photoinitiator 819. The mixture is then dispersed at high speed at 40°C until a slurry is formed. After this slurry, it is milled three times using a sand mill to obtain a paste with a viscosity of 3000-4000 mpas. This paste exhibits good thixotropic properties, which is beneficial for forming thin layers in stereolithography.

[0066] The method for preparing metal parts using the stereolithography paste in this embodiment is as follows: the stereolithography paste is subjected to SLA stereolithography (laser power 3 W, layer thickness 30 μm, scanning speed 2500 mm / s); the resulting green blank is degreased at 650-700℃ and then sintered at 1200-1300℃ to obtain a dense metal part with a surface finish of 5 μm.

[0067] Comparative Example 2

[0068] The stereolithography paste provided in this comparative example comprises, by mass, 95% metal powder, 4.5% photopolymer prepolymer and 0.5% photoinitiator.

[0069] The metal powder used was copper powder (particle size 20 μm). The preparation method of the stereolithography paste was the same as in Example 2. Copper powder (particle size 20 μm) was added to a liquid mixture of photopolymer prepolymers (IBOA, TMPTA, and CN964) and photoinitiator 819. The mixture was dispersed uniformly at high speed at 40°C and stirred into a slurry. After being milled three times using a sand mill, a paste with a viscosity of 3000-4000 mpas was obtained. This paste exhibits good thixotropic properties, which is beneficial for forming thin layers in stereolithography.

[0070] The method for preparing metal parts using the stereolithography paste in this embodiment is as follows: the stereolithography paste is subjected to DLP stereolithography (10000mJ / cm). 2 (30 μm layer thickness, 15 s exposure time); the resulting green body is degreased at 650-700℃ and then sintered at 1200-1300℃ to obtain a dense metal part with a surface finish of 4 μm.

[0071] Comparative Example 3

[0072] The stereolithography paste provided in this comparative example comprises, by mass, 94% metal powder, 4.5% photopolymer prepolymer, 1% optical additive HP500N and 0.5% photoinitiator.

[0073] The metal powder used was copper powder (particle size 20 μm). The preparation method of the stereolithography paste was the same as in Example 2. Copper powder (particle size 20 μm) was added to a liquid mixture of photopolymer prepolymers (IBOA, TMPTA, and CN964) and photoinitiator 819. The mixture was dispersed at high speed and stirred into a slurry at 40°C. After stirring, the slurry was milled three times using a sand mill to obtain a paste with a viscosity of 4000-5000 mpas. This paste exhibits good thixotropic properties, which is beneficial for forming thin layers in stereolithography.

[0074] The method for preparing metal parts using the stereolithography paste in this embodiment is as follows: the stereolithography paste is subjected to DLP stereolithography (10000mJ / cm). 2 (40μm layer thickness, 10s exposure time); the resulting green body is degreased at 650-700℃ and then sintered at 1200-1300℃ to obtain a dense metal part with a surface finish of 8μm.

[0075] Experimental Example: Performance Testing of Photolithographic Paste

[0076] This test example is used to test the UV curing depth, slurry stability, and stability of the subsequent deesterification and sintering process of the photolithographic paste prepared in the commercial examples and comparative examples.

[0077] 1. UV curing depth test

[0078] The testing method was as follows: Under the set process parameters, a 10 mm × 10 mm sheet was formed by single exposure on the forming platform, and the sheet thickness was measured using electronic calipers. The SLA process parameters were: power 1 W, scanning speed 2000 mm / s, 4000 mm / s; the DLP process parameters were: power 10000 mJ / cm². 2 Exposure times were 5 seconds and 10 seconds.

[0079] The results are shown in Table 1. Figure 1 and Figure 2 As shown, it can be seen that composite metal powders coated with PVP and slurries containing optical additives have a greater curing depth, while pure metal powder slurries have a smaller curing depth.

[0080] Table 1

[0081]

[0082] 2. Slurry stability test

[0083] The test method is as follows: Store the prepared slurry in a transparent glass bottle, away from light, and observe it once a week (7 days) to check the overall uniformity of the slurry. A stable state of 0-5 indicates that the slurry has completely settled to a uniform state with no settling.

[0084] The results are shown in Table 2. It can be seen that the slurry containing PVP-coated composite metal powder is stable within 4 weeks of storage, while the slurry containing pure metal powder is significantly uneven within 2 weeks, and the slurry containing optical additives is significantly uneven within 3 weeks.

[0085] Table 2

[0086]

[0087] 3. Stability of subsequent deesterification and sintering processes

[0088] The testing method is as follows: Use the slurry of each example to print test strips of 10 mm × 50 mm × 2 mm. After cleaning the surface, place them in a degreasing furnace, degrease and sinter according to the set process curve, and observe the appearance, density and surface smoothness of the printed parts.

[0089] The results are shown in Table 3. It can be seen that the composite metal powder slurry containing PVP coating exhibits stable physical properties after deesterification and sintering.

[0090] Table 3

[0091]

[0092] The above detailed embodiments describe the implementation of the present invention; however, the present invention is not limited to the specific details described in the above embodiments. Within the scope of the claims and technical concept of the present invention, various simple modifications and changes can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A stereolithographic paste for manufacturing metal parts, characterized in that, It comprises, by mass fraction, 90-98.9% composite metal powder, 1-9.9% photopolymer prepolymer and 0.1-1% photoinitiator; The composite metal powder is prepared by coating the surface of metal powder particles with a PVP film; the photopolymer prepolymer is at least two acrylate monomers with different functional groups.

2. The stereolithographic paste for manufacturing metal parts according to claim 1, characterized in that, The composite metal powder has a particle size of 10-30 μm, and the PVP film has a thickness of 20-100 nm.

3. The stereolithographic paste for manufacturing metal parts according to claim 1, characterized in that, The PVP membrane used has a PVP molecular weight of 30,000-1,000,000.

4. The stereolithographic paste for manufacturing metal parts according to claim 1, characterized in that, The metal powder is pure titanium, titanium alloy, or pure copper powder.

5. The stereolithographic paste for manufacturing metal parts according to claim 1, characterized in that, The photopolymer prepolymer is one or more of isobornyl acrylate, hexanediol diacrylate, trimethylolpropane triacrylate, ethoxybisphenol A dimethacrylate, and difunctional polyurethane acrylate.

6. The stereolithographic paste for manufacturing metal parts according to claim 1, characterized in that, The photoinitiator is one or more of diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 2-isopropylthioxanthraquinone (ITX).

7. An application of the stereolithographic paste according to any one of claims 1-6 for manufacturing metal parts, characterized in that, After the raw materials of the stereolithography paste are mixed evenly, stereolithography is performed to produce a green blank; The green blank is degreased and sintered into finished metal parts.

8. The application of the stereolithographic paste for manufacturing metal parts according to claim 7, characterized in that, The thickness of the stereolithography is 30-80 μm.

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