Comparative Analysis of the Structure and Properties of Alumina Ceramics Obtained by Conventional Pressureless Sintering and Spark Plasma Sintering

IF 0.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Inorganic Materials: Applied Research Pub Date : 2025-07-15 DOI:10.1134/S2075113325700492

M. S. Boldin, D. A. Tikhonova, A. D. Borkova, S. I. Udachin, E. A. Lantsev, A. V. Voronin, A. A. Murashov, O. A. Belkin, A. V. Nokhrin, V. N. Chuvil’deev

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Abstract

The effect of the initial size of alumina particles on the density, microstructure, hardness, and fracture toughness of ceramics obtained by conventional and spark plasma sintering (SPS) has been studied. We studied ceramics obtained from commercial Al₂O₃ powders with an initial particle size of 40 to 50 nm, 0.2 μm, and 1 μm and domestic fine powders with an initial particle size of 0.2 to 3 mm, and Al₂O₃ + 0.25 vol % MgO and Al₂O₃ + 10 vol % ZrO₂. It is shown that the density of alumina ceramics nonmonotonically depends on the initial size of Al₂O₃ powder particles. It has been established that an increase in the grain size leads to a nonmonotonic change in the hardness of alumina ceramics. It has been established that the addition of 0.25 vol % MgO accelerates the sintering of alumina. The addition of 10 vol % ZrO₂ makes it possible to provide an optimal combination of hardness and fracture toughness. It is shown that fine-grained ceramics obtained by the SPS method have a higher hardness. It has been suggested that SPS of submicron alumina powders with an amorphous layer on the surface, additionally stabilized by zirconia particles, is promising for further increasing the hardness of alumina ceramics.

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传统无压烧结与放电等离子烧结氧化铝陶瓷的结构与性能比较分析

研究了氧化铝颗粒初始尺寸对传统和放电等离子烧结陶瓷的密度、显微组织、硬度和断裂韧性的影响。我们研究了初始粒径为40 ~ 50nm、0.2 μm和1 μm的商用Al2O3粉末和初始粒径为0.2 ~ 3mm、Al2O3 + 0.25 vol % MgO和Al2O3 + 10 vol % ZrO2的国产细粉制备的陶瓷。结果表明，氧化铝陶瓷的密度与Al2O3粉末颗粒的初始尺寸呈非单调关系。晶粒尺寸的增大导致氧化铝陶瓷硬度的非单调变化。结果表明，添加0.25%体积分数的MgO能加速氧化铝的烧结。添加10 vol % ZrO2可以提供硬度和断裂韧性的最佳组合。结果表明，SPS法制备的细晶陶瓷具有较高的硬度。研究结果表明，表面有非晶层的亚微米氧化铝粉末，外加氧化锆颗粒的稳定，有望进一步提高氧化铝陶瓷的硬度。

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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.