Understanding the lower fracture resistance of cold sintered ceramics

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-10-03 DOI:10.1016/j.jeurceramsoc.2024.116968

Abdullah Jabr , Elija Ribul , David Salamon , Raul Bermejo

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引用次数: 0

Abstract

The cold sintering process (CSP) enables densification of ceramics at unprecedented low temperatures, unlocking unique opportunities in microstructural design. However, the mechanical behaviour of cold sintered ceramics remains unexplored. This study aims to compare the mechanical strength and fracture resistance of cold sintered (140°C) with conventionally sintered (1000°C) ZnO. The effect of grain size is investigated in samples sintered using conventional, cold and rapid sintering. It was found that cold sintered ZnO exhibits ∼50 % lower strength compared to conventionally sintered parts (∼120 vs. ∼240 MPa). This is explained by the lower fracture toughness of the former (0.57 vs. 1.15 MPa·m^1/2), resulting from a grain size effect that favours intergranular fracture along nanometric grains. This grain size effect is supported by the higher hardness measured on cold vs. conventionally sintered ZnO (4.5 vs. 1.8 GPa). The lower toughness of cold sintered ceramics is demonstrated to be related to their nanocrystalline nature.

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了解冷烧结陶瓷较低的抗断裂性

冷烧结工艺（CSP）能使陶瓷在前所未有的低温下致密化，为微结构设计带来了独特的机遇。然而，冷烧结陶瓷的机械性能仍有待探索。本研究旨在比较冷烧结（140°C）和传统烧结（1000°C）氧化锌的机械强度和抗断裂性。研究了传统烧结、冷烧结和快速烧结样品中晶粒大小的影响。研究发现，冷烧结氧化锌的强度比传统烧结零件低 50%（120 兆帕比 240 兆帕）。这是因为前者的断裂韧性较低（0.57 vs. 1.15 MPa-m1/2），这是晶粒尺寸效应造成的，有利于沿纳米晶粒发生晶间断裂。冷烧结 ZnO 与传统烧结 ZnO 相比测得的硬度更高（4.5 GPa 对 1.8 GPa），这也证明了晶粒尺寸效应。冷烧结陶瓷的韧性较低与它们的纳米结晶性质有关。

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

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.