Spark plasma sintering of binderless tungsten carbide: Densification, grain growth mechanism and mechanical properties

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-09-16 DOI:10.1016/j.jeurceramsoc.2025.117827

Dapeng Sun , Zhongbiao Tang , Jiuxing Zhang , Cuiliu Han , Guojian Lin , Jian Huang , Jingwen Zhang , Jihua Shang , Yan Wang

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Abstract

The densification and grain growth mechanism of binderless tungsten carbide (WC) during spark plasma sintering (SPS) were investigated by power-law creep and grain growth models. A comprehensive analysis of the phase composition, microstructure and mechanical properties of binderless WC was also implemented. The effective stress exponents (n) and grain growth exponents (m) were determined, and the isothermal densification of binderless WC was mainly controlled by grain boundary diffusion (n = 1.5) and dislocation climbing (n = 3), respectively. The corresponding apparent activation energies of densification (Q_d) were calculated to be 419.87 ± 57.88 kJ/mol and 920.81 ± 126.53 kJ/mol. The grain growth mechanism at higher temperatures (1900–2100℃) was determined to be grain boundary diffusion (m = 2). The binderless WC with well-balanced mechanical properties (HV = 2700 ± 27 kgf/mm², K_Ic = 8.85 ± 0.12 MN/m^3/2) was prepared via SPS at 1750℃.

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火花等离子烧结无粘结剂碳化钨：致密化、晶粒生长机理及力学性能

采用幂律蠕变和晶粒生长模型研究了无粘结剂碳化钨（WC）在放电等离子烧结过程中的致密化和晶粒生长机理。对无粘结WC的相组成、显微组织和力学性能进行了综合分析。测定了有效应力指数(n)和晶粒生长指数(m)，无粘结WC的等温致密化主要受晶界扩散（n = 1.5）和位错爬升（n = 3）控制。相应的致密化表观活化能（Qd）分别为419.87 ± 57.88 kJ/mol和920.81 ± 126.53 kJ/mol。在较高温度下（1900 ~ 2100℃），晶粒的生长机制为晶界扩散（m = 2）。在1750℃下，采用SPS法制备了力学性能均衡的无粘结剂WC （HV = 2700 ± 27 kgf/mm2, KIc = 8.85 ± 0.12 MN/m3/2）。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.