感应等离子球化技术制备喷涂用高熵硼化物粉体

doi:10.15541/jim20250008

摘要/Abstract

摘要： 原料粉体的制备是直接影响等离子喷涂涂层结构与性能的关键技术之一。目前,普遍用于的制备高熵硼化物粉体的方法——硼热还原法存在制备周期长、产物含杂质及无法直接得到用于喷涂的粉体等缺点。本工作采用感应等离子球化工艺(Induction plasma spheroidization, IPS)制备了喷涂用(Zr_1/4Hf_1/4Ta_1/4Ti_1/4)B₂高熵粉体,并与两种传统粉体制备工艺进行了比较。研究表征了不同工艺粉体的形貌、内部结构以及粒径、密度等基本性能,研究了不同粉体制备工艺高熵硼化物粉体显微结构及基本性能的影响,并验证了该工艺制备高熵硼化物粉体的普适性。结果表明,以商用微米级硼化物粉体为原料,通过混合-造粒-烧结-感应等离子球化的工艺可制备元素分布均匀的高熵粉体,该粉体还具有表面光滑、球形形状、内部致密度,且松装密度和振实密度高的特征。采用该工艺制备不同组元种类和含量的高熵硼化物粉体的结果,进一步验证了该工艺具有良好的普适性。结合第一性原理计算和IPS技术的特点,深入分析了粉体组元固溶高熵化的形成机制。本工作有望为喷涂用高熵陶瓷粉体的制备提供一条新的方法。

关键词: 感应等离子球化, 高熵陶瓷粉体, 硼化物, 喷涂用粉体

Abstract: The fabrication of feedstock powders is a critical technology that directly influences the microstructure and performance of plasma-sprayed coatings. Conventional boron thermal reduction methods for synthesizing high-entropy boride powders encounter several limitations such as prolonged processing time, impurity contamination, and inability to obtain spray-ready powders. In this work, an induction plasma spheroidization (IPS) process was employed to fabricate (Zr_1/4Hf_1/4Ta_1/4Ti_1/4)B₂ high-entropy powders for plasma spraying, while also comparing with the other two traditional powder preparation routes. The morphology, internal structure, particle size distribution, density, and other fundamental properties of powders were systematically characterized. The effects of different powder fabricating processes on the microstructure and fundamental properties of high-entropy boride powders were systematically investigated, thereby validating the broad applicability of this methodology for synthesizing high-entropy boride powders. The results demonstrate that using commercial micron-sized boride powders as precursors, a hybrid process combining mixing, spraying drying, sintering with IPS faciltates the fabrication of high-entropy powders with homogeneous elemental distribution. The resulting powders exhibit spherical morphology, smooth surfaces, high internal density, and high apparent/tap density. Further experiments synthesizing different high-entropy borides with varied compositions confirm the extensive applicability of this method. The formation mechanism of high-entropy solid solutions is elucidated through first-principles calculations combined with the unique characteristics of IPS process. This work proposes a promising method for fabricating high-entropy ceramic powders suitable for plasma-spray coatings.

Key words: Induction plasma spheroidization, high entropy ceramic powders, boride, powders for spray

中图分类号:

TQ174

余乐洋阳, 赵芳霞, 张舒心, 徐以祥, 牛亚然, 张振忠, 郑学斌. 感应等离子球化技术制备喷涂用高熵硼化物粉体[J]. 无机材料学报, DOI: 10.15541/jim20250008.

YU Leyangyang, ZHAO Fangxia, XU Yixiang, ZHANG Shuxin, FAN Dong, NIU Yaran, ZHANG Zhenzhong, ZHENG Xuebin. Preparation of High-entropy Boride Powders for Plasma Spraying by Inductive Plasma Spheroidization[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250008.

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