Synthesis, microstructure, mechanical and tribological properties of high-entropy carbides (WZrNbTaTi)C-SiCw

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-10-01 DOI:10.1016/j.ceramint.2024.09.423

Jiatai Zhang, Weili Wang, Zhixuan Zhang, Sijie Wei, Qiang Zhang, Zongyao Zhang, Weibin Zhang

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Abstract

In this work, composite high-entropy carbides (WZrNbTaTi)C-x SiCw (x = 0, 5 %, 10 %, 15 %, 20 %) are prepared using the two-step fast hot-pressing sintering (TSFHPS) method. The whiskers in the samples are evenly dispersed and well integrated with the ceramic matrix, forming high density materials. The mechanical properties and tribological properties at room temperature are studied, revealing that the addition of SiCw improves the performance of the materials. When the whisker content is 15 %, the hardness and fracture toughness of composite ceramics are the highest, which are 22.6 GPa and 6.8 MPa m^1/2, respectively. The bending strength of the samples increases monotonically with the increase of whisker content, and reaches 639.2 MPa at 20 % content. At the same time, the addition of an appropriate amount of SiCw prevents the propagation of micro-cracks and the expansion of oxidative wear, thereby reducing the friction coefficient and wear rate, and improving the wear resistance of high-entropy carbides.

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高熵碳化物 (WZrNbTaTi)C-SiCw 的合成、微观结构、力学和摩擦学特性

本研究采用两步快速热压烧结（TSFHPS）法制备了复合高熵碳化物（WZrNbTaTi）C-x SiCw（x = 0、5 %、10 %、15 %、20 %）。样品中的晶须分散均匀，与陶瓷基体结合良好，形成了高密度材料。对室温下的机械性能和摩擦学性能进行了研究，结果表明 SiCw 的加入提高了材料的性能。当晶须含量为 15% 时，复合陶瓷的硬度和断裂韧性最高，分别为 22.6 GPa 和 6.8 MPa m1/2。样品的抗弯强度随晶须含量的增加而单调增加，在晶须含量为 20% 时达到 639.2 MPa。同时，加入适量的 SiCw 可以防止微裂纹的扩展和氧化磨损的扩大，从而降低摩擦系数和磨损率，提高高熵碳化物的耐磨性。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.