具有优异烧结活性的高熵钛酸稀土纳米粉体的简易合成

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-02-03 DOI:10.1016/j.jallcom.2025.178976

Chengguang Lou , Xujing Fu , Jingwen Lv , Guo Zhang , Qiang Tian , Shuai Zhang , Wenjin Li , Xinghua Su

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引用次数: 0

摘要

采用聚丙烯酰胺凝胶法制备了分散性良好的高熵钛酸稀土纳米粉体。丙烯酰胺与钛（AM/Ti）的摩尔比和煅烧温度对纳米热电热粉体的粒径和团聚度有较大影响。随着AM/Ti摩尔比的增大，合成温度降低。制备的纳米热电晶体具有较高的烧结活性，在1500℃下烧结2 h即可烧结成致密体，烧结后的热电晶体在25 ~ 400℃范围内具有较高的硬度（13.45 GPa）、较大的杨氏模量（254 GPa）和较低的导热系数（2.14 ~ 2.29 W/(m·K)）。本研究提供了一种简便的合成方法，可制备出烧结性能优良的高温高压纳米粉体。

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Facile synthesis of high-entropy rare earth titanate nanopowders with excellent sintering activity

High-entropy rare earth titanate (HET) nanopowders with good dispersion were successfully synthesized by a simple polyacrylamide gel method. The particle size and agglomeration degree of the HET nanopowders were greatly influenced by the mole ratio of acrylamide to titanium (AM/Ti) and calcination temperature. Moreover, the synthesis temperature was decreased with the increase of the mole ratio of AM/Ti. The as-synthesized HET nanopowders possessed high sintering activity, which could be sintered into fully dense bulks at 1500 ℃ for 2 h. The sintered HET bulks exhibited the high hardness of 13.45 GPa, large Young’s modulus of 254 GPa, and relatively low thermal conductivity of 2.14–2.29 W/(m·K) in the temperature range of 25–400 ℃. This study provides a facile synthesis method for producing HET nanopowders with excellent sinterability.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.