image: A schematic diagram illustrating the grain growth process during the sintering of pure MgO and developed MgO a with smooth surface (referred to as MgO-SM, which stands for magnesia with a smooth surface)
Credit: Korea Institute of Materials Science (KIMS)
Dr. Cheol-Woo Ahn, leading a research team at the Department of Functional Ceramics within the Ceramic Materials Division at the Korea Institute of Materials Science(KIMS), has developed the world's first heat dissipation material. This material reduces hydrophilicity through a chemical reaction that forms a nanocrystalline composite layer and increases thermal conductivity by controlling point defects. This process occurs during a simple sintering process that does not require surface treatment. KIMS is a government-funded research institute under the Ministry of Science and ICT.
Conventional alumina filler, widely used for heat dissipation, has limitations in enhancing thermal conductivity. Therefore, there is potential in utilizing magnesia, which offers low raw material cost and excellent thermal conductivity and resistivity. However, magnesia’s high sintering temperature of 1,800°C and its hygroscopic nature, which reacts with moisture in the air, have restricted its use as a thermal filler.
The research team utilized additives to create a thin nanocrystalline composite layer during the sintering process, forming a protective layer that reacts with moisture. They succeeded in increasing thermal conductivity by controlling defects through lower sintering temperatures. This breakthrough is seen as overcoming the limitations of existing magnesia materials and opening new possibilities for thermal management materials in next-generation industries.
In recent years, with advancements in high-tech industries, the miniaturization and multi-functionality of electronic components have posed significant challenges for thermal management. This is particularly evident in the high-capacity batteries of electric vehicles and the increased integration of electronic components, necessitating heat dissipation materials with high thermal conductivity to manage rising heat density. Based on electric vehicle sales projections, the market for heat dissipation materials used in the thermal interface materials of electric vehicles is expected to reach approximately 9.7 trillion won in 2025. The results of this research hold significant promise in addressing moisture reaction issues and the high sintering temperatures associated with existing low-cost heat dissipation materials.
Dr. Cheol-Woo Ahn, the lead researcher stated, “We were able to address the moisture reaction issue, which causes mixing with polymers, in a straightforward manner through additives in the manufacturing process of oxide ceramic fillers. We have developed oxide fillers with high thermal conductivity by controlling defects. We anticipate that the developed low-cost, high-quality magnesia heat dissipation filler will dominate the heat dissipation ceramic material market.”
The research received funding from the Ministry of Science and ICT through a fundamental project at KIMS and a pilot project for domestic production of magnesium (Mg) ceramic raw materials from the Ministry of Trade, Industry and Energy. The research findings were published on December 14, 2023, in the prestigious journal Small Methods (IF=15.367), with Dr. Hyun-Ae Cha, Senior Researcher at KIMS, as the first author. Currently, the research team continues to conduct follow-up research to enhance performance, such as increasing the thermal conductivity of magnesia to the level of nitride heat dissipation ceramics. Additionally, KIMS is supporting mass production efforts by participating as a shareholder in SOULMATERIAL Co., Ltd., a research spin-off company established through technology investment.
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About Korea Institute of Materials Science(KIMS)
KIMS is a non-profit government-funded research institute under the Ministry of Science and ICT of the Republic of Korea. As the only institute specializing in comprehensive materials technologies in Korea, KIMS has contributed to Korean industry by carrying out a wide range of activities related to materials science including R&D, inspection, testing&evaluation, and technology support.
Journal
Small Methods
Article Title
Nanocrystalline Composite Layer Realized by Simple Sintering Without Surface Treatment, Reducing Hydrophilicity and Increasing Thermal Conductivity
Article Publication Date
14-Dec-2023