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Research Article | Open Access

Micromechanical characterization of microwave dielectric ceramic BaO–Sm2O3–5TiO2 by indentation and scratch methods

Ming Liu( ), Zhitong Xu
Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
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Abstract

Mechanical characterization of dielectric ceramics, which have drawn extensive attention in wireless communication, remains challenging. The micromechanical properties with the microstructures of dielectric ceramic BaO–Sm2O3–5TiO2 (BST) were assessed by nanoindentation, microhardness, and microscratch tests under different indenters, along with the X-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy. Accurate determination of elastic modulus (EIT) (i.e., 260 GPa) and indentation hardness (HIT) (i.e., 16.2 GPa) of brittle BST ceramic by the instrumented indentation technique requires low loads with little indentation-induced damage. The elastic modulus and indentation hardness were analyzed by different methodologies such as energy-based approach, displacement-based approach, and elastic recovery of Knoop imprint. Consistent values (about 3.1 MPa·m1/2) of fracture toughness (KC) of BST ceramic were obtained by different methods such as the Vickers indenter-induced cracking method, energy-based nanoindentation approaches, and linear elastic fracture mechanics (LEFM)-based scratch approach with a spherical indenter, demonstrating successful applications of indentation and scratch methods in characterizing fracture properties of brittle solids. The deterioration of elastic modulus or indentation hardness with the increase in indentation load (F) is caused by indentation-induced damage and can be used to determine the fracture toughness of material by energy-based nanoindentation approaches, and the critical void volume fraction (f*) is 0.27 (or 0.18) if elastic modulus (or indentation hardness) of the brittle BST ceramic is used. The fracture work at the critical load corresponding to the initial decrease in elastic modulus or indentation hardness can also be used to assess the fracture toughness of brittle solids, opening new venues of the application of nanoindentation test as a means to characterize the fracture toughness of brittle ceramics.

Keywords

brittle ceramicsmicromechanical propertiesinstrumented indentationmicroscratchfracture toughness (KC)grid nanoindentation

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Journal of Advanced Ceramics
Volume 12 Issue 6,
June 2023
Pages 1136-1165
DOI: 10.26599/JAC.2023.9220744
Cite this article:
Liu M, Xu Z. Micromechanical characterization of microwave dielectric ceramic BaO–Sm2O3–5TiO2 by indentation and scratch methods. Journal of Advanced Ceramics, 2023, 12(6): 1136-1165. https://doi.org/10.26599/JAC.2023.9220744

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Received: 18 August 2022
Revised: 05 March 2023
Accepted: 21 March 2023
Published: 23 May 2023
© The Author(s) 2023.

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