Study on microstructure and arc ablation performance of WCu composites prepared by Ni-decorated W powders

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

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-09-03 DOI:10.1016/j.ijrmhm.2025.107416

Nan Deng , Zhongxin Xu , Qiao Zhang , Zheng Chen , Yang Wang , Shuhua Liang

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引用次数: 0

Abstract

The development of high-performance tungsten‑copper (WCu) contact materials is hindered by severe mass loss under coupled thermal-electrical-mechanical stresses, particularly due to inhomogeneous microstructures and weak sintering necks in conventional composites. Here, we propose a scalable strategy utilizing Ni-decorated W powders to engineer rapid diffusion pathways during infiltration, addressing these limitations synergistically. The 250 nm Ni particle activates tungsten particles through interfacial diffusion, enabling robust sintering neck formation while maintaining structural integrity of the W skeleton. This microstructure engineering produced Nickel-activated WCu composites, which reduced the mass loss by 51.8 % compared with the unmodified materials. This work not only deciphers the role of decorated interfaces in microstructural homogenization but also establishes a paradigm for designing durable electrical contact materials via nano-scale surface activation.

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ni修饰W粉制备WCu复合材料的微观结构及电弧烧蚀性能研究

高性能钨铜（WCu）接触材料的发展受到热-电-机械耦合应力下严重质量损失的阻碍，特别是由于传统复合材料的不均匀微观结构和弱烧结颈。在这里，我们提出了一种可扩展的策略，利用ni装饰的W粉末来设计渗透过程中的快速扩散途径，协同解决这些限制。250 nm的Ni颗粒通过界面扩散激活钨颗粒，在保持W骨架结构完整性的同时，实现了强劲的烧结颈形成。该微结构工程制备的镍活化WCu复合材料与未改性材料相比，质量损失降低了51.8%。这项工作不仅解释了装饰界面在微观结构均质化中的作用，而且还通过纳米级表面活化建立了设计耐用电接触材料的范例。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.