Structure evolutions of the polymer derived medium-/high-entropy metal carbides

被引：8
作者：
Du, Bin [1 ]
Huang, Xingming [1 ]
Wang, Anzhe [2 ]
Liu, Yiran [1 ]
Cheng, Yuan [3 ]
机构：
[1] Guangzhou Univ, Sch Phys & Mat Sci, Guangzhou 510006, Peoples R China
[2] Nanjing Inst Technol, Sch Mat Sci & Engn, Nanjing 211167, Peoples R China
[3] Harbin Inst Technol, Natl key Lab Sci & Technol Adv Composites Special, Harbin 150001, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2023年 / 939卷
基金：
中国国家自然科学基金;
关键词：
Polymer derived ceramics; High-entropy ceramics; Carbides; Phase evolutions; THERMODYNAMIC PROPERTIES; RARE-EARTH; CERAMICS; STABILITY;
D O I：
10.1016/j.jallcom.2023.168737
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ceramic powders with low oxygen content are highly demanded in monolithic ceramics. In this work, a series of medium-/high-entropy ceramic (HEC) particles, including (Zr0.25Ta0.25Nb0.25Ti0.25)C, (Zr0.2Ta0.2Nb0.2Ti0.2W0.2)C, (Zr1/6Ta1/6Nb1/6Ti1/6W1/6Hf1/6)C (Zr1/7Ta1/7Nb1/7Ti1/7W1/7Hf1/7V1/7)C, and (Zr1/ 8Ta1/8Nb1/8Ti1/8W1/8Hf1/8V1/8Mo1/8)C, were successfully fabricated by the polymer-derived ceramic (PDC) route. The structure evolutions of the precursor demonstrated that HEC particles obtained at 1800 degrees C possessed a single phase and rock-salt structure. All the samples had the similar microstructures (hillock structure) and a low oxygen impurity content (less than 2.00 wt%). The results also demonstrated that the as-obtained HEC particles had a disordered distribution of elements from nanoscale to microscale. This work proved a new method to fabricate the HEC powders with low oxygen impurity content and the HEC precursors for further obtaining the nanofibers or ceramic matrix composites. (c) 2023 Elsevier B.V. All rights reserved.
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页数：7
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