应材料科学与工程学院黄陆军教授、张宇特任副研究员的邀请，圣彼得堡海洋国立技术大学Dr. Sci. Stanislav Evlashin、Dr. Andrey Tikhonov和Dr. Julia Bondareva于2025年04月09日来我校进行线下学术讲座，欢迎感兴趣的师生参加。
讲座时间：2025年04月09日，14:00 (北京时间)
讲座地点：材料楼708会议室
Dr. Sci. Stanislav Evlashin
题目为“Multimaterial printing by using the direct energy deposition”
Personal Profiles：Dr. Sci. Stanislav Evlashin graduated from Moscow State University in 2009, defended his PhD thesis in 2014, and completed his doctoral thesis on carbon nanomaterials in 2024. From 2009 to 2017, he actively engaged in nanomaterial research at Moscow State University, after which he joined Skoltech and began studying additive materials. Currently, his main research interests focus on functional gradient materials, high-entropy alloys, and metal-matrix composites. Over the course of his career, more than 100 publications have been published, and his H-index is 24.
Abstract: Additive technologies significantly expand the possibilities for manufacturing complex geometries. Instead of relying on a complex procedure for welding parts, it has become possible to produce components in a single technological cycle. However, additive technologies are still limited in their ability to manufacture multi-material objects with complex geometries and functional properties. Among various printing technologies, the most suitable method for producing functional gradient materials is Direct Energy Deposition (DED) using a powder mixture. This technology enables in situ changes to the chemical composition of the manufactured materials. In this study, we used DED to print functional gradient materials. In a series of experiments, we manufactured gradient magnetic materials and demonstrated that, by varying the composition of additives, it is possible to significantly alter the magnetic and mechanical properties of stainless steel across a wide range. Samples were also fabricated using two types of steel, which allowed for the formation of a continuous layer at the weld boundary and achieved high mechanical characteristics at the joint. In another series of experiments, we investigated the properties of multilayer titanium alloys. Specifically, samples were created from pure titanium with alternating layers, and their mechanical and structural characteristics were analyzed. Additionally, reactive printing of titanium in a nitrogen atmosphere was studied, resulting in a substantial increase in strength characteristics.
Dr. Julia Bondareva
题目为“Thermal and electrical properties of additively manufactured polymer-boron nitride composite”
Personal Profiles：Julia Bondareva graduated from the Chemistry Department of St. Petersburg State University in 2011, where she developed a strong foundation in chemical sciences. She pursued further studies at the Skolkovo Institute of Science and Technology, earning a Master's degree in Materials Science and Technology in 2014. Her master's research focused on production and investigation of thin films made from sulfonimide-based dendrimers. In 2020, she completed her PhD in Chemistry at the same institution, with her doctoral research emphasizing innovative approaches to nanomaterials and thin-film technologies. Since 2020, Julia has been working as a research scientist at the Skolkovo Institute of Science and Technology. Her work involves cutting-edge research in materials chemistry, particularly the synthesis of nanoparticles and graphene-based nanomaterials. She also specializes in the production and characterization of organic and inorganic thin films. Additionally, her research extends to studying the physicochemical and thermal properties of products created through additive manufacturing, contributing to advancements in 3D printing technologies.
Abstract: The efficiency of electronic microchip-based devices has improved significantly with technological advancements, accompanied by a reduction in their size. However, this miniaturization often results in overheating of components such as power transistors, processors, and power diodes, compromising their reliability and lifespan. To address these challenges, researchers are investigating materials with superior heat dissipation properties. One promising solution is the use of polymer–boron nitride composites. We explore the application of 3D printing via digital light processing to create composite radiators with varying concentrations of boron nitride. The thermal conductivity of these composites, measured across a temperature range of 3–300 K, is highly dependent on the boron nitride concentration. Additionally, the incorporation of boron nitride alters the volt–current behavior, potentially due to percolation currents during material deposition. Ab initio calculations further reveal the atomic-level behavior and orientation of boron nitride flakes under external electric fields. These findings highlight the potential of photopolymer-based composites filled with boron nitride, manufactured through additive techniques, for enhanced thermal management in modern electronics.
Dr. Andrey Tikhonov
题目为“Ceramics and hydrogel-ceramic composites as promising materials for stereolithography 3D printing”
Personal Profiles: Andrey Tikhonov achieved his Ph.D. degree from Lomonosov Moscow State University, Moscow, Russia in 2023. From 2012 to 2022, he studied and worked in Lomonosov Moscow State University as a junior engineer and junior research scientist (Moscow, Russia). In 2018, he joined Skolkovo Institute of Science and Technology as an engineer and from 2023 became senior research engineer (Moscow, Russia). His research interests are about synthesis of calcium phosphate powders and bioceramics for regeneration of bone tissue, 3D printing of ceramic and hydrogel-ceramic materials for the broad range of application including machinery, aerospace, medicine, electronics, refractories, etc. Andrey and colleagues have developed a wide range of ceramic-based photocurable compositions for both industrial (SLA) and desktop (mSLA) vat polymerization 3D printers.
Abstract： Stereolithography (SLA) is one of the most precise 3D printing techniques, enabling the fabrication of complex structures with high resolution. However, conventional photopolymer materials have limitations in terms of mechanical strength, thermal stability, and biocompatibility, driving the search for new functional materials.
This presentation will explore the potential of ceramic and hydrogel-ceramic composites in SLA printing. Ceramics, known for their high thermal resistance, mechanical durability, and bioinertness, offer promising applications in aerospace, medicine (implants, dental prosthetics), etc. However, their printing poses challenges, including high slurry viscosity, debindingnecessity, sintering shrinkage, and brittleness. Hydrogel-ceramic composites, which combine ceramic fillers with hydrophilic polymer matrices, can be one alternative material to the commonly used photopolymers or tough ceramics.
