无真空直流电弧等离子体法制备高熵二硼化物TiZrNbHfTaB2

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-18 DOI:10.1016/j.ijrmhm.2025.107417

A.Ya. Pak, P.V. Povalyaev, A.V. Vlasov, R.D. Gerasimov, Zh.S. Bolatova, A.A. Svinukhova, A.V. Spodina, Y.Z. Vassilyeva

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引用次数: 0

摘要

该研究首次展示了利用真空电弧法合成高熵硼化物（HEB） TiZrNbHfTaB2微纳米级粒子的潜力。电弧诱导一氧化碳和二氧化碳的形成，提供了反应体积不受大气氧气影响的自屏蔽效应，使反应转向硼化物的形成。合成产物为alb2型六方晶格固溶体，含有钛、锆、铌、铪和钽原子。HEB TiZrNbHfTaB2相的晶格参数为a = 3.1045 Å， c = 3.3775 Å。对合成产物的分析显示，微米大小的颗粒团块由单个颗粒组成，以及纳米大小的颗粒。采用火花等离子烧结法制备了大块陶瓷样品。最佳烧结参数为：2000℃，10 MPa, 5 min，升温速率为100℃/min。研究进行了确定的机械和热物理性质的散装HEB样品。

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Synthesis of high-entropy diboride TiZrNbHfTaB2 by vacuum-free direct current arc plasma method

The study is the first to demonstrate the potential for synthesizing micro- and nanosized particles of high-entropy boride (HEB) TiZrNbHfTaB₂ by vacuum-free electric arc method. Arcing induces the formation of carbon monoxide and carbon dioxide, providing a self-shielding effect of the reaction volume from atmospheric oxygen, which shifts the reaction towards boride formation. The synthesis product was identified as a solid solution with the AlB₂-type hexagonal lattice, containing atoms of titanium, zirconium, niobium, hafnium, and tantalum. The lattice parameters of the HEB TiZrNbHfTaB₂ phase were a = 3.1045 Å and c = 3.3775 Å. The analysis of the synthesis product revealed agglomerates of micron-sized particles consisting of individual particles, as well as nanosized particles. Bulk ceramic samples were fabricated by spark plasma sintering. The optimal sintering parameters were as follows: 2000 °C, 10 MPa, 5 min at a heating rate of 100 °C/min. Studies were conducted to determine the mechanical and thermophysical properties of the bulk HEB sample.

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.