Microstructural evolution and mechanical behavior of WC–4wt.%TiC–3wt.%TaC–12wt.%Co refractory cermet consolidated by spark plasma sintering of mechanically activated powder mixtures

IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Advanced Powder Technology Pub Date : 2024-08-21 DOI:10.1016/j.apt.2024.104625
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Abstract

The paper studied the structural features and physicomechanical properties of the WC–4wt.%TiC–3wt.%TaC–12wt.%Co composite refractory hard alloy system obtained by spark plasma sintering (SPS) from a preliminarily mechanically activated powder. It has been shown that preliminary mechanical activation in a planetary mill contributed to the comminution of agglomerates and the formation of a monomodal particle size distribution with a predominance of the submicron fraction, which intensifies the densification processes during subsequent consolidation by the SPS method. Kinetic analysis of the SPS process showed a two-stage sintering pattern with intense densification at temperatures above 790 °C due to rearrangement of WC, TiC, TaC particles and melting of the cobalt binder. It has been found that the SPS method does not lead to the formation of undesirable secondary phases in the entire sintering temperature range. A sintering temperature of 1200 °C is optimal for achieving the best structural homogeneity, density and mechanical properties, providing optimal distribution of carbide phases and the cobalt binder. The microstructure of the sample obtained at 1200 °C represents a refractory skeleton of WC grains with TiC and TaC carbide particles uniformly distributed throughout the volume. Improved fluidity of the melted cobalt binder and its mobile redistribution contribute to increased compactness of the structure and reduced porosity of the material. Samples sintered at 1200 °C possess high physicomechanical characteristics: relative density 99.99 %, hardness HV30 1623.2, bending strength 1125.1 MPa, fracture toughness 10.5 MN⋅m1/2. The abrasive wear resistance of a newly synthesized hard material was evaluated through a turning operation. Results showed durability, indicating promise for cutting tool applications and the need for further research to fully characterize the performance of this novel material.

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机械活化粉末混合物经火花等离子烧结固结成的 WC-4wt.%TiC-3wt.%TaC-12wt.%Co 耐火金属陶瓷的微观结构演变和机械性能
本文研究了从初步机械活化粉末中通过火花等离子烧结(SPS)获得的 WC-4wt.%TiC-3wt.%TaC-12wt.%Co 复合难熔硬质合金体系的结构特征和物理机械性能。研究表明,行星磨中的初步机械活化有助于团聚体的粉碎,并形成以亚微米部分为主的单模态粒度分布,从而在随后的 SPS 方法固结过程中强化了致密化过程。对 SPS 过程的动力学分析表明,由于 WC、TiC、TaC 颗粒的重新排列和钴粘结剂的熔化,烧结模式分为两个阶段,在温度高于 790 ℃ 时会产生强烈的致密化。研究发现,在整个烧结温度范围内,SPS 方法都不会导致不良次生相的形成。1200 °C 的烧结温度最适合实现最佳的结构均匀性、密度和机械性能,并提供碳化物相和钴粘结剂的最佳分布。在 1200 °C 下获得的样品微观结构是由 WC 晶粒组成的耐火骨架,TiC 和 TaC 碳化物颗粒在整个体积中均匀分布。熔融钴粘结剂流动性的改善及其移动性的重新分布有助于提高结构的致密性和降低材料的孔隙率。在 1200 °C 下烧结的样品具有很高的物理机械特性:相对密度 99.99 %、硬度 HV30 1623.2、抗弯强度 1125.1 MPa、断裂韧性 10.5 MN-m1/2。通过车削操作评估了新合成硬质材料的耐磨性。结果表明,这种材料具有耐磨性,有望应用于切削工具,同时也表明有必要开展进一步研究,以全面鉴定这种新型材料的性能。
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来源期刊
Advanced Powder Technology
Advanced Powder Technology 工程技术-工程:化工
CiteScore
9.50
自引率
7.70%
发文量
424
审稿时长
55 days
期刊介绍: The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)
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