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Journal of Advanced Ceramics 2023, 12(6): 1136-1165 https://doi.org/10.26599/JAC.2023.9220744
Research Article | Open Access | Issue | Published: 23 May 2023

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

Show Author's Information 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
Keywords:
microscratch, brittle ceramics, micromechanical properties, instrumented indentation, grid nanoindentation, fracture toughness (KC)
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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Abstract Full text About this article

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.


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About this article

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

Show Author's information 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

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: microscratch, brittle ceramics, micromechanical properties, instrumented indentation, grid nanoindentation, fracture toughness (KC)

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Publication history

Received: 18 August 2022
Revised: 05 March 2023
Accepted: 21 March 2023
Published: 23 May 2023
Issue date: June 2023

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© The Author(s) 2023.

Acknowledgements

This project is supported by the National Natural Science Foundation of China (51705082), Fujian Provincial Minjiang Scholar Program (0020-510759), Development Center of Scientific and Educational Park of Fuzhou University in the city of Jinjiang (2019-JJFDKY-11), and Fujian Provincial Collaborative Innovation Center for High-end Equipment Manufacturing (0020-50006103).

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