Additive manufacturing system and method for multi-material, layer-wise deposition, in-situ UV curing, laser debinding, and laser-based melting, fusion, or sintering using multiple jetting heads

Abstract

This invention relates to an advanced additive manufacturing system and method for producing complex, multi-material metal or ceramic parts. The process involves digitally depositing multiple layers of different metallic or ceramic slurries onto a substrate. Each deposited layer is immediately cured using ultraviolet radiation, creating a stable structure. Next, a laser selectively removes the binder from designated regions, exposing the underlying metal or ceramic particles. These exposed particles are subsequently melted, fused, or sintered by another laser, resulting in fully dense regions. The process is repeated layer-by-layer under carefully controlled environmental conditions, with continuous monitoring of temperature, atmosphere composition, layer thickness, and overall process quality through integrated sensors. This invention significantly improves production speed, accuracy, and component quality, enabling the creation of advanced components with tailored multi-material properties suitable for demanding applications in industries such as aerospace, medical implants, energy systems, and electronics.

Description

Additive Manufacturing System and Method for Multi-Material, Layer-wise Deposition, In-Situ UV Curing, Laser Debinding, and Laser-Based Melting, Fusion, or Sintering Using Multiple Jetting Heads

[0001] The present invention relates to the field of additive manufacturing, and more specifically to advanced methods and systems for the layer-by-layer fabrication of three-dimensional objects from metallic and / or ceramic materials. This invention is particularly directed to multi-material additive manufacturing processes that employ multiple jetting heads to deposit metal- or ceramic-containing slurries, followed by in-situ ultraviolet (UV) curing, selective laser debinding, and laser-based melting, fusion, or sintering to produce dense and functionally complex components. The invention further encompasses apparatus and techniques for digitally controlled, sequential processing of different materials within a single build platform, enabling the creation of parts with tailored material properties and intricate internal architectures for use in aerospace, medical, electronic, energy, and industrial applications.

[0002] Additive manufacturing (AM), commonly known as 3D printing, has fundamentally transformed the fabrication of advanced components across aerospace, energy, and medical sectors by enabling layer-wise construction of complex geometries with high material efficiency [1-3]. For metals and ceramics, prevalent AM approaches include binder jetting, direct ink writing (DIW), stereolithography (SLA), and selective laser sintering / melting (SLS / SLM), all of which have achieved notable commercial success for both prototyping and functional part production [1-4].

[0003] Conventional powder-based AM processes, such as binder jetting and powder bed fusion, build parts by selectively joining or melting powder layers. However, these techniques suffer from several limitations, including low green body density, suboptimal powder flowability, and frequent requirements for post-processing such as solvent or thermal debinding and furnace sintering [1-5]. These factors often lead to poor mechanical properties, limited dimensional accuracy, and complex multi-stage workflows.

[0004] To address these challenges, slurry-based 3D printing has emerged as a powerful alternative, utilizing highly filled suspensions of metal or ceramic powders dispersed in a liquid binder to form each layer [1-6]. This strategy offers higher green density, better particle packing, and enhanced feature resolution. Slurry-based methods can yield layers as thin as 50–100 µm and surface roughness suitable for high-performance engineering applications [1, 6].

[0005] Despite these advances, slurry-based AM systems still commonly require multiple separate steps, layer deposition, curing or drying, debinding (usually thermal or solvent-based), and high-temperature densification in external furnaces. Such fragmented workflows increase production complexity, processing time, and handling risks [1, 4-6]. Multi-material fabrication, particularly with precise spatial control within a single layer, remains challenging with current systems.

[0006] Recent innovations have explored laser-based debinding, where a focused laser energy source selectively removes the binder from each layer in situ. This reduces the need for hazardous solvents and lengthy thermal cycles, thus enabling more integrated and efficient workflows [6][8][9]. However, existing laser-debinding solutions typically remain limited to single-material systems or require separate equipment for sintering and densification [7, 8].

[0007] In the context of related art, several patent disclosures address various aspects of additive manufacturing with a focus on debinding and densification:

[0008] US 2017 / 0056974 A1 discloses a method of additive manufacturing involving selective laser sintering (SLS) combined with a post-build debinding step in a separate furnace. While it demonstrates the potential for laser-assisted consolidation of metal powders, it does not integrate in-situ laser debinding or multi-material slurry deposition within the same automated platform [9].

[0009] EP 3569330 A1 describes an additive manufacturing method utilizing paste extrusion to create green bodies that are subsequently subjected to thermal or solvent-based debinding followed by furnace sintering. Although it addresses challenges related to slurry or paste-based AM, it similarly lacks an integrated in-situ laser debinding step and does not support multi-material deposition within a single layer

[0010] .

[0010] US 11376788 B2 presents an additive manufacturing apparatus designed for producing ceramic and metal parts via paste extrusion, with separate in-situ debinding and sintering steps. However, this patent remains limited to extrusion-based methods, lacking any jetting-based deposition, UV curing capability, or direct in-situ laser melting and fusion within a fully automated workflow

[0011] .

[0011] Furthermore, patents such as WO2023020907A1 introduce in-situ debinding and sintering methods for filament or paste-based extrusion processes, emphasizing improved process efficiency. Nonetheless, they remain restricted to extrusion-based deposition methods, without digital jetting or multi-material spatial resolution within individual layers [8].

[0012] Thus, despite advancements described in these patents and literature, no existing system or method fully integrates multi-material slurry jetting, in-situ UV curing, laser-based debinding, and laser melting / fusion / sintering in a single automated additive manufacturing platform. The current art still lacks a unified solution capable of digitally controlled, precise, and scalable multi-material fabrication.

[0013] In summary, the state of the art reveals a clear technical gap. While previous inventions and patents have separately addressed aspects of slurry-based deposition, laser debinding, or in-situ sintering, none provide a comprehensive, fully integrated additive manufacturing system and method as disclosed by the present invention.References

[0014] 1- Erhard, P. et al. "Characterization of Slurry-Cast Layer Compounds for 3D Printing of High Strength Casting Cores."Materials2021, 14, 6149.

[0015] 2- Zhu, J. et al. "Engineering 3D-printed aqueous colloidal ceramic slurry for direct ink writing."Green Chemical Engineering4 (2023) 73–80.

[0016] 3- Tian, X. et al. "Net-Shaping of Ceramic Components by Using Rapid Prototyping Technologies."Advances in Ceramics(2011).

[0017] 4- Erhard, P. et al. "Evaluation and optimisation of a slurry-based layer casting process in additive manufacturing."Production Engineering(2022) 16:43–54.

[0018] 5- Ortega Varela de Seijas, M. et al. "Laser debinding of parts produced through material extrusion additive manufacturing."Journal of Manufacturing Processes88 (2023) 1–11.

[0019] 6- Ortega Varela de Seijas, M. et al. "A novel route to produce metal or ceramic parts in space: local debinding and sintering of powdered filaments."CEAS Space Journal(2025) 17:393–405.

[0020] 7- WIPO WO2023020907A1, "Method and apparatus for in situ debinding and sintering of filament or paste extrusion additive manufactured metal or ceramic parts."

[0021] 8- US 2017 / 0056974 A1, "Method and apparatus for additive manufacturing involving selective laser sintering and furnace debinding."

[0022] 9- EP 3569330 A1, "Additive manufacturing of paste-extruded green bodies followed by thermal debinding and sintering."

[0023] 10- US 11376788 B2, "Additive manufacturing apparatus for ceramic and metal parts with in-situ debinding and sintering."

[0024] The present invention provides an integrated additive manufacturing system and method for fabricating complex three-dimensional objects from two or more different metallic and / or ceramic materials in a single, continuous process. This invention addresses longstanding limitations of conventional powder-based, slurry-based, and hybrid additive manufacturing technologies by uniting digital multi-material jetting, in-situ ultraviolet (UV) curing, selective laser debinding, and laser-based melting, fusion, or sintering within a single automated platform.

[0025] In accordance with the invention, multiple print heads are configured to independently deposit distinct, highly filled metal or ceramic slurries in a precise, layer-wise fashion onto a build substrate. Each layer may be composed of different materials placed in defined regions according to a digital design, enabling the creation of parts with engineered, spatially resolved compositions, such as shells, cores, gradients, or functionally graded structures.

[0026] Immediately following deposition, each layer is exposed to an in-situ UV curing process, which rapidly solidifies the photopolymer binder in the deposited slurry. This step produces a mechanically robust green part, allowing for accurate retention of complex features and ensuring sufficient green strength for subsequent processing. The UV curing step is performed without the need for intermediate handling, significantly improving production speed and part quality.

[0027] After UV curing, a selective laser debinding step is carried out in-situ. Using a scanning laser (or lasers) with wavelength and power chosen according to the specific binder and material system, the polymer binder is locally ablated or decomposed in predefined regions of the cured layer. This process cleanly exposes the underlying metal or ceramic powders while minimizing thermal stress, binder residues, and risk of distortion.

[0028] Following laser debinding, a second, higher-energy laser process is performed in-situ to selectively melt, fuse, or sinter the now-debound powders in each layer. This laser melting / fusion / sintering step achieves high local densification and metallurgical or ceramic bonding, producing dense, functional parts directly from the green body structure. Importantly, the process is fully compatible with the use of multiple materials within a single layer or part, allowing for the formation of strong, well-defined interfaces and advanced material architectures.

[0029] The sequence of deposition, UV curing, laser debinding, and laser melting / fusion / sintering is repeated for each layer until the entire three-dimensional object is built. The system operates under a controlled atmosphere, with real-time monitoring and digital process control to ensure high quality, reproducibility, and process efficiency.

[0030] This invention enables the direct, automated production of dense, multi-material components with minimal post-processing and virtually unlimited geometric complexity. It is applicable to a wide range of materials, including but not limited to stainless steels, copper alloys, refractory metals, ceramics, and their composites, and is suitable for advanced applications in aerospace, medical devices, energy systems, and electronics. The fully integrated, digitally controlled workflow provides significant improvements in productivity, design flexibility, and part performance compared to existing technologies.

[0031] In summary, the invention provides a transformative additive manufacturing platform and process, characterized by:

[0032] - Multi-material, layer-wise slurry jetting using multiple independent print heads;

[0033] - In-situ UV curing for rapid green body formation;

[0034] - Selective, in-situ laser debinding tailored to each material and binder;

[0035] - In-situ laser melting, fusion, or sintering for high-density part fabrication;

[0036] - Digital control and real-time process monitoring for precision and quality;

[0037] - Capability for complex, functionally graded, and multi-material structures within a single automated machine.

[0038] Conventional Despite rapid progress in the field of additive manufacturing, several important technical challenges persist, particularly in the fabrication of high-quality, dense, and complex multi-material components from metals and ceramics.

[0039] First, conventional powder-based techniques such as binder jetting and powder bed fusion face inherent limitations related to powder flowability, low packing density, and the risk of incomplete melting or sintering. These factors often result in parts with suboptimal mechanical properties, high porosity, and rough surfaces. Achieving reliable interfaces between different materials within a single part remains especially difficult, restricting the practical realization of functionally graded or hybrid structures.

[0040] Second, current slurry-based or paste-based additive manufacturing processes, while offering improved packing density and surface quality, still depend on a series of separate and time-consuming process steps. Typically, these include layer deposition, drying or curing, solvent or thermal debinding, and high-temperature densification in a separate furnace. This fragmented workflow increases production times, requires extensive manual handling and transfer between machines, and elevates the risk of part distortion, contamination, or loss of dimensional accuracy. The use of hazardous solvents or lengthy thermal cycles for debinding further complicates process integration and increases environmental and safety concerns.

[0041] Third, there is no widely available solution that provides true layer-wise, digitally controlled deposition of multiple materials within a single build platform. Multi-material printing with spatially resolved composition, such as creating a metallic shell around a ceramic or metallic core, is highly challenging with existing technologies. Most current systems cannot seamlessly transition between different material types, nor can they provide the level of process control required to achieve sharp interfaces, intricate architectures, or functionally graded materials.

[0042] Fourth, while some recent research has demonstrated the use of lasers for in-situ debinding or localized sintering, these methods are typically limited to simple material systems and do not offer a fully integrated process. Current systems still require manual handling between debinding and densification steps or lack the means to digitally coordinate multiple energy sources (e.g., UV curing, laser debinding, laser melting) in an automated, sequential workflow.

[0043] As a result, the technical problems addressed by this invention include:

[0044] - The absence of an integrated, automated process for the layer-wise, multi-material deposition, in-situ curing, selective laser debinding, and high-energy melting or sintering of metal and ceramic slurries.

[0045] - The lack of a scalable system capable of precisely and digitally controlling each step for rapid, solvent-free, and high-fidelity production of dense, multi-material parts.

[0046] - The difficulty of producing complex, multi-material structures, especially those with sharp or graded interfaces, within a single, seamless workflow, without intermediate handling or post-processing in external equipment.

[0047] To sum up, there is a clear unmet need for an advanced additive manufacturing platform and process that can overcome these challenges by enabling fully automated, digitally controlled, multi-material fabrication with integrated in-situ curing, laser debinding, and laser-based melting, fusion, or sintering. This invention directly addresses these technical problems and fills a significant gap in the current state of the art.

[0048] The present invention provides a practical and robust solution to the longstanding technical challenges associated with multi-material additive manufacturing of metals and ceramics. It delivers a fully integrated, digitally controlled platform that unites all critical processing steps, multi-material deposition, in-situ curing, selective laser debinding, and laser-based melting, fusion, or sintering, into a single, automated workflow.

[0049] Firstly, the invention employs multiple independent jetting heads, each capable of depositing distinct, highly loaded metal or ceramic slurries with precise spatial and layer-wise control. This digital, drop-on-demand jetting technology enables true multi-material printing within a single build platform, allowing complex architectures such as shells, cores, or functionally graded regions to be realized in one part. Different materials can be deposited in adjacent or overlapping zones with sharp boundaries or smooth gradients, depending on the design requirements.

[0050] Secondly, immediately after deposition, each layer is exposed to in-situ ultraviolet (UV) curing. This rapid curing step solidifies the photopolymer binder throughout the newly deposited slurry, resulting in a strong and dimensionally stable green body. This approach eliminates the need for lengthy drying cycles or manual transfers between machines, preserves the accuracy of fine features, and provides sufficient strength for subsequent processing steps.

[0051] Thirdly, the invention incorporates a selective, in-situ laser debinding process. By scanning the cured layer with a laser of tailored wavelength and power, the system precisely removes or decomposes the organic binder in specific regions. This process creates clean channels and exposes the metal or ceramic powders for direct densification, while minimizing the risk of part distortion or contamination. The in-situ nature of this step also eliminates the hazards and inefficiencies associated with solvent-based or batch thermal debinding.

[0052] Fourth, following laser debinding, the same build environment enables laser-based melting, fusion, or sintering. Using a separate, high-power laser source, the system selectively consolidates the exposed powder in each layer, achieving dense and metallurgically bonded regions as required by the part design. This capability makes it possible to fabricate dense, functional components with minimal porosity and high structural integrity, directly from the digital model, without the need for post-processing in external furnaces.

[0053] Finally, the entire sequence of deposition, curing, debinding, and densification is repeated for each layer in a digitally controlled, automated cycle. The system maintains a controlled atmosphere throughout, monitors all key process parameters in real time, and provides exceptional flexibility for the fabrication of advanced, multi-material geometries.

[0054] As a result, the invention enables the direct, scalable, and high-quality production of complex parts from two or more materials, with engineered interfaces and tailored properties. It significantly reduces process times, eliminates unnecessary manual handling, and removes the reliance on hazardous solvents or extensive post-processing. The platform is adaptable to a wide range of metals, ceramics, and their composites, and is applicable across demanding fields such as aerospace, energy, electronics, and medical devices.

[0055] In conclusion, this invention offers a transformative solution that addresses the core limitations of prior additive manufacturing techniques. It combines the advantages of digital multi-material deposition, rapid in-situ curing, precise laser debinding, and direct laser melting or sintering, all within a unified and automated manufacturing environment.

[0056] The invention described herein provides several significant and practical advantages over conventional additive manufacturing systems, especially in the field of multi-material fabrication with metals and ceramics.

[0057] - Seamless Multi-Material Integration: The system’s use of multiple jetting heads allows for precise, digitally controlled deposition of different metal and / or ceramic slurries within a single layer and across layers. This enables the fabrication of complex, multi-material parts, such as components with metallic shells and ceramic or metallic cores, functionally graded structures, or embedded features, without the need for separate processing steps or machines. It empowers engineers and designers to realize new material combinations and architectures that were previously impractical or impossible.

[0058] - Enhanced Part Quality and Performance: By employing highly filled slurries and immediate in-situ UV curing, the invention produces green parts with superior density, strength, and dimensional stability. The selective laser debinding and laser melting / fusion / sintering processes further densify and consolidate the material, leading to finished parts with excellent mechanical properties, high surface quality, and minimal porosity. This integrated process also reduces common defects associated with traditional powder-based AM, such as delamination, warping, or poor interlayer adhesion.

[0059] - Drastically Reduced Processing Time and Complexity: Unlike traditional workflows that require multiple transfers between machines for debinding and sintering, this invention executes all steps, deposition, curing, debinding, and densification, in a single, automated system. This not only shortens the overall manufacturing time but also minimizes handling, reduces the risk of part damage or contamination, and improves overall process efficiency.

[0060] - Solvent-Free and Environmentally Friendly Process: The system eliminates the need for hazardous solvents or extended thermal debinding cycles, as all binder removal is performed in-situ using targeted laser energy. This makes the process safer, more environmentally sustainable, and easier to operate in both industrial and research settings.

[0061] - Scalability and Flexibility: Thanks to its modular design and digital process control, the invention can be readily adapted to different part geometries, material combinations, and production volumes. The process can be optimized for various metals, ceramics, or composites, making it attractive for both prototyping and mass production in fields such as aerospace, energy, medical devices, and electronics.

[0062] - Precision and Design Freedom: Digital control of the deposition, curing, debinding, and melting steps provides exceptional resolution and repeatability. The system can produce intricate internal features, sharp or graded interfaces, and highly customized material layouts, all directly from a digital design, with minimal manual intervention.

[0063] - Cost-Effectiveness: By consolidating multiple processes into a single automated workflow, the invention reduces capital investment, operational labor, and maintenance costs. The efficient use of materials and energy further contributes to cost savings over the lifecycle of production.

[0064] - Compatibility with Advanced Materials and Applications: The platform’s flexibility supports advanced alloys, ceramics, and composite formulations, and can accommodate evolving material innovations. It is well suited to the manufacture of high-performance components for critical applications, including those requiring high thermal conductivity, corrosion resistance, or tailored mechanical and functional properties.

[0065] . Schematic of the materials jetting step which it illustrates:

[0066] [NO. 1] Shows the print substrate, which is the build plate of the system and the print job would be done on top of that.

[0067] [NO. 2] Shows the print jetting head for drop on demand depositing of slurry, which 2A presents the print jetting head of the material A and 2B presents the print jetting head of the material B.

[0068] [NO.3] Shows the slurry of material A, which is dropping from the print jetting head of material A to deposit a layer.

[0069] [NO. 4] Shows the slurry of material B, which is dropping from the print jetting head of material B to deposit a layer.

[0070] [NO. 5] Shows the deposited layer of the slurries of material A and B.

[0071] [NO. 6] Shows the particles (ceramic or metallic powders) of Material A inside the deposited slurry.

[0072] [NO. 7] Shows the binder in the slurry of Material A.

[0073] [NO. 8] Shows the particles of Material B inside the deposited slurry.

[0074] [NO. 9] Shows the binder in the slurry of Material B.

[0075] [NO. 10] Shows the interface of two deposited slurries.

[0076] . Schematic of the curing step which it illustrates:

[0077] [NO. 1] Shows the print substrate, which is the build plate of the system and the print job would be done on top of that.

[0078] [NO. 2] Shows the UV source or lamp or laser, which shines on the deposited layer to initiate polymerization and cure the slurry.

[0079] [NO. 3] Shows the deposited and cured layer of Material A.

[0080] [NO. 4] Shows the deposited and cured layer of Material B.

[0081] . Schematic of the laser debinding step of cured layer which it illustrates:

[0082] [NO. 1] Shows the print substrate, which is the build plate of the system and the print job would be done on top of that.

[0083] [NO. 2] Shows the laser source for laser debinding, which opt to the binder material can be CO2, Diode, Fiber, Nd:YAG or other types of laser with different wave length.

[0084] [NO.3] Shows the 3D galvanometer, which is connected to the laser source and moves the laser beam to scan the surface of deposited layer.

[0085] [NO. 4] Shows the laser beam, which is focused on deposited layer.

[0086] [NO. 5] Shows the particles of material A, which are debinded.

[0087] [NO. 6] Shows the particles of material B, which are debinded.

[0088] . Schematic of the laser melting or sintering of debinded layer of particles or powders which it illustrates:

[0089] [NO. 1] Shows the print substrate, which is the build plate of the system and the print job would be done on top of that.

[0090] [NO. 2] Shows the laser source for laser melting or sintering, which opt to the material of particles can be CO2, Diode, Fiber, Nd:YAG or other types of laser with different wave length. The Continuous Wave (CW) ytterbium-doped fiber laser (Yb-fiber laser) with 1070–1080 nm (near-infrared) is common for the laser powder bed fusion systems.

[0091] [NO.3] Shows the 3D galvanometer, which is connected to the laser source and moves the laser beam to scan the surface of deposited layer.

[0092] [NO. 4] Shows the laser beam, which is focused on deposited layer.

[0093] [NO. 5] Shows the printed layer of material A, which is laser processed.

[0094] [NO. 6] Shows the printed layer of material B, which is laser processed.

[0095] [NO. 7] Shows the melt pool or laser affected area through the deposited layer.

[0096] . Schematic of the depositing the second or new layer and the start of repeating the steps 1 to 4, which it illustrates:

[0097] [NO. 1] Shows the print substrate, which is the build plate of the system and the print job would be done on top of that.

[0098] [NO. 2] Shows the print jetting head for drop on demand depositing of slurry, which 2A presents the print jetting head of the material A, and 2B presents the print jetting head of the material B.

[0099] [NO.3] Shows the slurry of material A, which is dropping from the print jetting head of material A to deposit a layer.

[0100] [NO. 4] Shows the slurry of material B, which is dropping from the print jetting head of material B to deposit a layer.

[0101] [NO. 5] Shows the newly deposited layer of the slurries of material A and B.

[0102] [NO. 6] Shows the particles (ceramic or metallic powders) of Material A inside the deposited slurry.

[0103] [NO. 7] Shows the binder in the slurry of Material A.

[0104] [NO. 8] Shows the particles of Material B inside the deposited slurry.

[0105] [NO. 9] Shows the binder in the slurry of Material B.

[0106] [NO. 10] Shows the interface of two deposited slurries.

[0107] [NO. 11] Shows the previously printed layer of material A, which serving as the substrate of new deposited layer.

[0108] [NO. 12] Shows the last printed layer of material B, which is the substrate of new deposited layer.

[0109] The present invention provides an integrated additive manufacturing system and method capable of producing complex, dense, and multi-material three-dimensional components. The system brings together multiple jetting heads for precise slurry deposition, in-situ ultraviolet (UV) curing, selective laser debinding, and laser-based melting, fusion, or sintering, all within a single automated build environment.

[0110] General System Overview

[0111] In one embodiment, the system includes a build platform or print substrate that is housed within a controlled-atmosphere chamber. Multiple independently controlled jetting heads are mounted on a gantry or robotic arm, each head dedicated to dispensing a highly filled slurry of specific metallic or ceramic powder suspended in a photopolymerizable binder. The jetting heads can deposit their respective materials in a spatially programmed manner, allowing different regions of each layer to be constructed from different materials according to a digital design file.

[0112] Layer-wise Deposition and Curing

[0113] For each build layer, the system operates as follows:

[0114] A. The jetting heads move across the build platform and selectively deposit droplets or strips of their respective slurries onto predetermined regions, building up a patterned layer that reflects the desired multi-material structure.

[0115] B. Once the entire layer is deposited, a UV source (such as a Digital Light Projection (DLP) projector, Liquid Crystal Display (LCD) panel, or scanning UV lamp) irradiates the layer, curing the binder and forming a strong, dimensionally accurate green body. The UV curing step is completed rapidly, ensuring mechanical stability of the layer and preserving fine feature definition.

[0116] Laser Debinding

[0117] After curing, a laser source is activated to scan across selected areas of the cured layer. The laser may be a CO₂, fiber, diode, Nd:YAG, or another type appropriate to the binder and powder composition. The laser beam is delivered to the workpiece via a galvanometer scanning system, enabling rapid, precise movement of the focused beam. The energy from the laser ablates or decomposes the organic binder in selected regions, exposing the underlying metal or ceramic powders and preparing them for consolidation.

[0118] Laser Melting, Fusion, or Sintering

[0119] A separate, higher-powered laser system is then used to melt, fuse, or sinter the exposed powder within the debound regions. This laser is also delivered through a scanning system, ensuring accurate coverage of the targeted zones. Melting or sintering achieves high local densification and metallurgical or ceramic bonding of the material, resulting in a robust and fully consolidated structure.

[0120] Layer Repetition and Part Completion

[0121] After processing one layer, the build platform is lowered by one increment, and the process is repeated: the jetting heads deposit the next layer, UV curing is performed, followed by laser debinding and laser melting or sintering. This sequence continues until the entire three-dimensional part is fabricated according to the digital design.

[0122] Multi-Material and Functional Grading

[0123] The system is particularly well-suited to fabricating multi-material or functionally graded parts. For example, a part may have a core of one material (such as copper for high thermal conductivity) and a shell of another (such as stainless steel for corrosion resistance). Sharp interfaces, graded transitions, or intricate embedded features can all be achieved by programming the deposition pattern and adjusting the process parameters for each material.

[0124] Atmosphere and Process Control

[0125] Throughout the process, the atmosphere within the chamber is carefully controlled, typically using inert or reducing gases to prevent oxidation or contamination. Sensors are used to monitor temperature, atmosphere composition, layer thickness, and process quality, enabling real-time adjustments for optimal results.

[0126] Detailed Sensor Integration and Process Monitoring

[0127] The system integrates multiple sensor types placed strategically within the build chamber to precisely and continuously monitor critical process parameters, ensuring consistent part quality and repeatability. Specifically, the system uses:

[0128] Temperature Monitoring:

[0129] Non-contact infrared (IR) pyrometers and IR thermal cameras measure the temperature of each layer and the melt pool formed during laser melting or sintering. These sensors continuously provide real-time data, enabling the system to adjust laser power, scanning speed, or cooling rates to maintain optimal temperature conditions.

[0130] Atmosphere Composition Monitoring:

[0131] Electrochemical or zirconia-based oxygen analyzers and capacitive moisture sensors accurately measure oxygen and humidity levels inside the chamber. Maintaining low levels of oxygen and humidity is critical to preventing oxidation, contamination, and ensuring the quality of metallic and ceramic materials. The sensors' data are integrated into a feedback loop that automatically controls inert gas flow and purity.

[0132] Layer Thickness Monitoring:

[0133] Laser displacement sensors or optical profilometers scan the surface of each newly deposited layer immediately after curing. These sensors precisely measure deviations from the intended layer thickness, allowing real-time adjustments to slurry deposition parameters, including jetting speed, droplet volume, and nozzle height, ensuring dimensional accuracy and layer uniformity.

[0134] Process Quality and Integrity Monitoring:

[0135] High-resolution cameras and optical inspection systems capture detailed images of deposited, cured, debound, and densified layers, assessing the overall integrity of each step. Advanced image processing software analyzes captured images, identifies potential defects (e.g., cracks, uneven surfaces, incomplete debinding), and provides instant quality feedback. The system dynamically adjusts process parameters, such as UV exposure time, laser scanning speed, or power, based on these analyses to continually enhance the manufacturing quality.

[0136] Integration and Feedback Control

[0137] All sensor systems described above are integrated into a central control unit, which digitally orchestrates the entire process. Real-time data from these sensors allow the system to adaptively control all process parameters. This integration significantly enhances component quality, process reliability, and reproducibility, ensuring that each manufactured component meets precise specifications. The sensor data also provide thorough documentation and traceability for rigorous quality assurance in regulated industries such as aerospace, medical devices, and electronics manufacturing.

[0138] Scalability and Adaptability

[0139] The described system can be adapted for various sizes and production scales, from small research or prototyping setups to industrial-scale manufacturing lines. The modular design of the jetting heads and energy sources allows for customization based on material requirements, desired part complexity, or throughput targets.

[0140] ApplicabilityThe invention is suitable for use with a broad range of metallic, ceramic, or composite powders and binders. It is applicable to fabricating components for aerospace, energy, electronics, tooling, biomedical implants, and other demanding fields where design freedom, multi-material integration, and superior part quality are required.

[0141] The present invention is highly applicable to a wide range of industrial sectors that require the precise, efficient, and cost-effective manufacture of complex multi-material components from metals, ceramics, or their combinations. Its unique integration of multi-material jetting, in-situ UV curing, selective laser debinding, and laser-based melting, fusion, or sintering makes it suitable for both high-mix, low-volume production and large-scale manufacturing environments.

[0142] Aerospace and Aviation: In aerospace, there is a continual demand for lightweight, high-strength, and functionally integrated components. The invention enables the production of parts with tailored material distributions, such as metallic structures with embedded heat sinks or graded interfaces, that meet stringent weight, strength, and thermal management requirements. The system’s ability to fabricate intricate internal cooling channels, graded structures, and bonded joints within a single build process is highly valuable for turbine components, engine parts, and airframe structures.

[0143] Energy and Power Generation: For the energy sector, the invention supports the fabrication of advanced heat exchangers, fuel cells, power electronics, and other critical components that require both thermal and structural optimization. Its capability to process copper, stainless steel, ceramics, and novel alloys in a single workflow addresses the increasing complexity and performance needs of modern energy systems.

[0144] Medical Devices and Implants: Medical applications benefit from the system’s precision and flexibility in producing custom implants, surgical instruments, and prosthetics. The process allows for the integration of biocompatible metals and ceramics in complex shapes with controlled porosity, tailored mechanical properties, and functional gradients, important for osseointegration, wear resistance, and patient-specific performance.

[0145] Electronics and Microfabrication: The invention is well-suited for the production of multi-material electronic components, including printed circuit boards, connectors, microelectromechanical systems (MEMS), and sensor housings. The ability to combine conductive, insulating, and structural materials in a single, automated process offers significant advantages in miniaturization and design integration.

[0146] Tooling, Molds, and Industrial Equipment: Manufacturers of dies, molds, and industrial tooling can use the system to produce parts with localized reinforcement, conformal cooling channels, and multi-material inserts, reducing lead times and improving tool life and performance.

[0147] Research, Development, and Custom Manufacturing: Beyond large-scale industries, the invention is highly applicable to research labs, prototyping centers, and custom manufacturers seeking rapid turnaround of advanced parts from digital designs, with full freedom to experiment with new materials and geometries.

[0148] Production Efficiency and Adaptability: The system’s digital control, rapid cycling, and minimal manual intervention make it compatible with modern smart manufacturing and Industry 4.0 environments. It is easily adaptable for batch or continuous production and can be scaled or configured for specific industrial needs.

Claims

An additive manufacturing method for producing a multi-material three-dimensional component, the method comprising the steps of:a. depositing, by means of at least two independently controlled jetting heads, multiple distinct slurries composed of metallic or ceramic particles suspended in a photopolymerizable binder onto a build platform to form a patterned layer, wherein each slurry corresponds to a different material composition;b. curing the patterned layer in situ using ultraviolet (UV) radiation to polymerize the binder, thereby forming a mechanically stable green body layer;c. selectively removing the polymerized binder from specific regions of the cured layer using a focused laser beam (laser debinding), thereby exposing the underlying metallic or ceramic particles in targeted areas;d. subsequently melting, fusing, or sintering the exposed particles within the debound regions using a second focused laser beam to achieve localized densification and form bonded regions within the layer; ande. repeating steps (a) through (d) sequentially for each successive layer, building up the three-dimensional component until completion.The method of claim 1, wherein the jetting heads deposit the slurries digitally and independently according to a predetermined spatial pattern defined by a digital design file, thereby enabling the fabrication of components with multiple distinct materials in discrete or graded zones within the same layer.The method of claim 1 or claim 2, wherein the UV curing step employs digital light projection (DLP), liquid crystal display (LCD), or scanning UV exposure to cure the entire deposited layer rapidly and uniformly.The method of any preceding claim, wherein the laser debinding step utilizes a laser selected from a group comprising CO₂ lasers, diode lasers, fiber lasers, and Nd:YAG lasers, with wavelength and power chosen according to the binder and particle material compositions.The method of any preceding claim, wherein the laser melting, fusion, or sintering step employs a continuous-wave (CW) ytterbium-doped fiber laser (Yb-fiber laser) operating in the near-infrared range (approximately 1070–1080 nm), or another suitable laser selected according to the material being processed.The method of any preceding claim, wherein all steps are performed within a single, enclosed build environment containing an inert or reducing gas atmosphere to prevent oxidation and contamination during deposition, curing, debinding, and densification.The method of any preceding claim, further comprising the step of monitoring process parameters in real-time, including layer thickness, curing effectiveness, temperature distribution, and debinding quality, and dynamically adjusting subsequent steps accordingly.The method of any preceding claim, wherein the resulting three-dimensional component includes distinct material regions such as a metallic shell surrounding a ceramic or metallic core, graded transition zones, or embedded features tailored to specific structural or functional requirements.An additive manufacturing apparatus for fabricating multi-material three-dimensional components, comprising:a. at least two independent jetting heads configured to deposit distinct slurries of metallic or ceramic particles suspended in photopolymerizable binders onto a build platform according to digitally controlled patterns;b. a UV curing unit configured to irradiate deposited layers and initiate polymerization of the binders immediately after deposition;c. a first laser system equipped with galvanometer-controlled optics for selective removal (debinding) of the polymerized binder from predetermined areas of cured layers;d. a second laser system equipped with galvanometer-controlled optics for selective melting, fusion, or sintering of the metallic or ceramic particles exposed during the debinding step; ande. an integrated control unit programmed to coordinate and automate the deposition, curing, debinding, and densification processes sequentially and layer-wise within a single enclosed build environment.The apparatus of claim 9, further comprising a controlled-atmosphere enclosure that provides inert or reducing gas conditions during the entire manufacturing process to minimize oxidation, contamination, and material degradation.The apparatus of claim 9 or claim 10, further including process-monitoring sensors for real-time measurement of key process parameters such as temperature, layer thickness, curing completeness, and debinding effectiveness, integrated with a feedback control system for adaptive process adjustments.The apparatus of any of claims 9 to 11, wherein the UV curing unit comprises a digital light projection (DLP) or liquid crystal display (LCD) panel capable of providing rapid, uniform UV exposure across the entire deposited layer surface.The apparatus of any of claims 9 to 12, wherein the laser systems for debinding and melting / fusion / sintering utilize laser types selected from a group comprising CO₂ lasers, diode lasers, fiber lasers, and Nd:YAG lasers, chosen based on specific material and binder characteristics.The apparatus of any of claims 9 to 13, wherein the jetting heads, UV curing unit, and laser systems are mounted on a common gantry or robotic assembly configured to ensure precise, repeatable, and programmable motion relative to the build platform.A multi-material three-dimensional component fabricated by the method of any of claims 1 through 8, or by using the apparatus of any of claims 9 through 14, wherein the component exhibits at least two distinct materials integrated within the same structural component, and wherein the materials are bonded at clearly defined interfaces or smoothly graded transitional regions, exhibiting dense, substantially defect-free microstructures throughout.

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