Thermal Conductivity of YAG:Nd + Mo Ceramic Composites Obtained by Spark Plasma Sintering

IF 0.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Inorganic Materials: Applied Research Pub Date : 2024-10-09 DOI:10.1134/S2075113324701090

L. S. Alekseeva, A. V. Nokhrin, A. I. Orlova, M. S. Boldin, E. A. Lantcev, A. A. Murashov, V. N. Chuvil’deev, N. Yu. Tabachkova, N. V. Sakharov, A. A. Moskvichev

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Abstract

The microstructure and thermophysical properties (specific heat capacity, thermal diffusivity, thermal conductivity) of fine-grained ceramic composites based on yttrium-aluminum garnet Y_2.5Nd_0.5Al₅O₁₂ (YAG:Nd) with different molybdenum contents (10, 20 and 40 vol %) were studied. Submicron garnet powders of Y_2.5Nd_0.5Al₅O₁₂ were obtained by the coprecipitation method; YAG:Nd + Mo powder compositions with the YAG:Nd core–Mo shell structure were obtained by deposition of molybdenum onto the surface of garnet particles; samples of ceramic composites were obtained by the method of spark plasma sintering (SPS). Electron microscopy and X-ray phase analysis were used to study the microstructure and phase composition of the composites. YAG:Nd + Mo composites have a high relative density (98.1–99%) and a uniform fine-grained microstructure with a garnet grain size of 2–3 μm. Sintered YAG:Nd + Mo composites at room and elevated temperatures (up to 1100°C) have a high thermal conductivity coefficient exceeding the thermal conductivity coefficient of uranium dioxide UO₂, which allows using these materials as heat-resistant inert fuel matrices. It was shown that higher thermal conductivity of composites is ensured at a content of at least 20 vol % Mo. In composites with the addition of 20 and 40% Mo, the thermal conductivity coefficient at 1100°C reaches 7.0 and 8.8 W m^–1 K^–1, respectively.

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火花等离子烧结法获得的 YAG:Nd + Mo 陶瓷复合材料的导热性

研究了基于钇铝石榴石 Y2.5Nd0.5Al5O12 (YAG:Nd)和不同钼含量（10、20 和 40 Vol %）的细颗粒陶瓷复合材料的微观结构和热物理性质（比热容、热扩散率和热导率）。通过共沉淀法获得了 Y2.5Nd0.5Al5O12 亚微米石榴石粉末；通过在石榴石颗粒表面沉积钼，获得了具有 YAG:Nd 核-钼壳结构的 YAG:Nd + Mo 粉末成分；通过火花等离子烧结 (SPS) 法获得了陶瓷复合材料样品。电子显微镜和 X 射线相分析用于研究复合材料的微观结构和相组成。YAG:Nd + Mo 复合材料具有较高的相对密度（98.1-99%）和均匀的细粒度微结构，石榴石晶粒大小为 2-3 μm。烧结的 YAG:Nd + Mo 复合材料在室温和高温（高达 1100°C）下的热导率系数很高，超过了二氧化铀的热导率系数，因此可以将这些材料用作耐热惰性燃料基质。研究表明，钼含量至少达到 20 Vol % 时，复合材料的导热系数会更高。在添加了 20% 和 40% Mo 的复合材料中，1100°C 时的导热系数分别达到 7.0 和 8.8 W m-1 K-1。

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来源期刊

Inorganic Materials: Applied Research Engineering-Engineering (all)

CiteScore

0.90

自引率

0.00%

发文量

199

期刊介绍： Inorganic Materials: Applied Research contains translations of research articles devoted to applied aspects of inorganic materials. Best articles are selected from four Russian periodicals: Materialovedenie, Perspektivnye Materialy, Fizika i Khimiya Obrabotki Materialov, and Voprosy Materialovedeniya and translated into English. The journal reports recent achievements in materials science: physical and chemical bases of materials science; effects of synergism in composite materials; computer simulations; creation of new materials (including carbon-based materials and ceramics, semiconductors, superconductors, composite materials, polymers, materials for nuclear engineering, materials for aircraft and space engineering, materials for quantum electronics, materials for electronics and optoelectronics, materials for nuclear and thermonuclear power engineering, radiation-hardened materials, materials for use in medicine, etc.); analytical techniques; structure–property relationships; nanostructures and nanotechnologies; advanced technologies; use of hydrogen in structural materials; and economic and environmental issues. The journal also considers engineering issues of materials processing with plasma, high-gradient crystallization, laser technology, and ultrasonic technology. Currently the journal does not accept direct submissions, but submissions to one of the source journals is possible.