The effect of N vacancy on the synthesis and properties of high-entropy nitride ceramics (Ti0.25V0.25Cr0.25Nb0.25)N0.825

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Journal of Solid State Chemistry Pub Date : 2025-04-01 Epub Date: 2025-01-10 DOI:10.1016/j.jssc.2025.125202

Peixun Wang , Zilin Yu , Peicheng Mo , Jun Zhang , Yi Wu , Chao Chen

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Abstract

High-entropy ceramics (HECs) have gained significant attention in ceramics research due to their unique single-crystal structure, extensive composition range, and exceptional physicochemical properties. In this study, TiN_0.3 with anionic vacancies was prepared using mechanical alloying, while high-entropy nitride ceramics (Ti_0.25V_0.25Cr_0.25Nb_0.25)N_0.825 were synthesized using the Spark Plasma Sintering (SPS) process, utilizing TiN_0.3 as a sintering aid. The microstructure and mechanical properties of the high-entropy nitride ceramics at different sintering temperatures were thoroughly investigated. The results indicate that (1) non-stoichiometric TiN_0.3 was formed after 48 h of high-energy ball milling of Ti and TiN due to the concentration gradient, (2) single-phase Face-Centered Cubic (FCC) structured high-entropy nitride ceramics (Ti_0.25V_0.25Cr_0.25Nb_0.25)N_0.825 were synthesized using TiN_0.3 as a sintering accelerator, and (3) the maximum values of flexural strength (925 ± 46 MPa), hardness (16.88 ± 1.50 GPa), and fracture toughness (3.02 ± 0.15 MPa m^1/2) of the high-entropy nitride ceramics (Ti_0.25V_0.25Cr_0.25Nb_0.25)N_0.825 were achieved at a temperature of 1700 °C. This paper presents an innovative approach that combines vacancies with high-entropy ceramics, providing a novel synthetic pathway for high-entropy nitride ceramics. This new synthesis method opens up opportunities for exploring fresh directions in the research and application of ceramic materials, holding significant scientific importance and promising application prospects.

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N空位对高熵氮化陶瓷（Ti0.25V0.25Cr0.25Nb0.25）N0.825合成及性能的影响

高熵陶瓷以其独特的单晶结构、广泛的组成范围和优异的物理化学性质在陶瓷研究中备受关注。本研究采用机械合金化法制备了具有阴离子空位的TiN0.3，并以TiN0.3为助烧结剂，采用火花等离子烧结（SPS）法制备了高熵氮化陶瓷（Ti0.25V0.25Cr0.25Nb0.25）N0.825。研究了不同烧结温度下高熵氮化陶瓷的显微组织和力学性能。结果表明：(1)由于浓度梯度作用，Ti和TiN经48 h高能球磨后形成非化学量的TiN0.3;(2)以TiN0.3为烧结促进剂，合成了单相面心立方（FCC）结构的高熵氮化陶瓷（Ti0.25V0.25Cr0.25Nb0.25）N0.825;(3)抗折强度（925±46 MPa）、硬度（16.88±1.50 GPa）、在1700℃下，高熵氮化陶瓷（Ti0.25V0.25Cr0.25Nb0.25）N0.825的断裂韧性为3.02±0.15 MPa m1/2。本文提出了一种将空位与高熵陶瓷相结合的创新方法，为高熵氮化陶瓷的合成提供了一条新的途径。这种新的合成方法为陶瓷材料的研究和应用开辟了新的方向，具有重要的科学意义和广阔的应用前景。

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来源期刊

Journal of Solid State Chemistry 化学-无机化学与核化学

CiteScore

6.00

自引率

9.10%

发文量

848

审稿时长

25 days

期刊介绍： Covering major developments in the field of solid state chemistry and related areas such as ceramics and amorphous materials, the Journal of Solid State Chemistry features studies of chemical, structural, thermodynamic, electronic, magnetic, and optical properties and processes in solids.