Ultrafast high-temperature sintering of aluminum nitride

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-10-28 DOI:10.1016/j.jeurceramsoc.2024.117025

Minwook Kim , Unseo Kim , Seon-Gyu Kim , Yunsang Kwak , Sung-Soo Ryu , Jaehun Cho

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引用次数: 0

Abstract

Ultrafast high-temperature sintering (UHS) has received significant attention due to its effectiveness in consolidating ceramics in a very rapid manner. However, the application of UHS to non-oxide materials has been limited due to their extremely low sinterability. In this study, the UHS technique was applied to AlN to demonstrate its applicability and examine the resulting microstructure evolution and mechanical properties. High densification was achieved using electric currents of 47 A, 50 A, and 53 A for 240 s, with corresponding specimen temperatures of 1807.5 °C, 1872.8 °C, and 1935.6 °C. Vickers hardness increases up to 240 s but decreases at 300 s due to grain growth and sublimation of secondary phases. Fracture toughness decreases with larger grain sizes showing the inverse relationship between grain size and toughness. This study demonstrates that UHS is applicable to non-oxide ceramics, which offers significant potential for energy savings and rapid processing in non-oxide ceramic manufacturing.

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氮化铝的超快高温烧结

超快高温烧结（UHS）因其在快速固结陶瓷方面的有效性而备受关注。然而，由于非氧化物材料的烧结性极低，超高速高温烧结技术在这些材料上的应用一直受到限制。在本研究中，UHS 技术被应用于 AlN，以证明其适用性，并检验由此产生的微观结构演变和机械性能。使用 47 A、50 A 和 53 A 的电流持续 240 秒，相应的试样温度分别为 1807.5 ℃、1872.8 ℃ 和 1935.6 ℃，实现了高致密化。维氏硬度在 240 秒内增加，但在 300 秒时由于晶粒长大和次生相升华而降低。断裂韧性随着晶粒尺寸的增大而降低，这表明晶粒尺寸与韧性之间存在反比关系。这项研究表明，UHS 适用于非氧化物陶瓷，这为非氧化物陶瓷制造的节能和快速加工提供了巨大潜力。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.