Micromechanical and microstructure characterization of BaO-Sm2O3–5TiO2 ceramic with addition of Al2O3

Liu, Ming; Xu, Zhitong; Fu, Renli

doi:10.1016/j.ceramint.2021.09.184

Cited by 28 publications

(9 citation statements)

References 99 publications

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“…where EIT and ν = 0.2 [7] are elastic modulus and Poisson's ratio of BST ceramic, respectively; Ei = 1141 GPa, and νi = 0.07 are elastic modulus and Poisson's ratio of…”

Section: Oliver and Pharr Methods For Analyzing Instrumented Indentationmentioning

confidence: 99%

“…Gaussian distribution [7]. Since Weibull distribution has been widely used to assess the statistical variation of strength [147] or the measured cracking length of brittle materials (e.g., ceramics [148,149] and glasses [150]), and values of fracture toughness obtained by 40 measurements of 2c under each load were analyzed by the well-known two-parameter Weibull distribution equation [149,151]:…”

Section: J U S T a C C E P T E Dmentioning

confidence: 99%

“…The rapid development of wireless communication with the broadband network has significantly increased the demand for microwave dielectric ceramics of excellent dielectric behaviors (e.g., suitable relative permittivity, high quality factor, and low-temperature drift of resonance frequency [1][2][3]) together with high J u s t A c c e p t e d mechanical properties (e.g., elastic modulus, hardness, and fracture toughness [4][5][6][7]), since excellent mechanical properties (e.g., high cracking resistance [8][9][10][11] and penetration resistance [12,13]) can ensure high structural stability, high reliability and long-term service life of dielectric ceramics, and have drawn extensive attention in the field of dielectric ceramics [4][5][6]14]. Values of Meyer and Knoop hardness of dielectric ceramic (Ba0.9Ca0.1)0.9(Na0.5Bi0.5)0.1TiO3 were found to be almost the same, and both increased with increasing sintering temperature [15].…”

Section: Introductionmentioning

confidence: 99%

“…tensile properties [28], creep behavior [29], low-cycle fatigue [30,31], residual stress [32], and fracture toughness [33,34]) of various materials (e.g., metals [35], glasses [36], metallic glasses [37], ceramics [7,38], polymers [39][40][41], piezoelectric materials [42][43][44][45], thin films [46][47][48][49], and composites [50]). Microscratch test is also an effective technique to investigate scratch resistance of material [51], the structural integrity of multilayer coatings [52], tribological behavior [53,54], contact-induced damage/cracking [55], scratch-induced buckling failure of silicon nitride ceramic films [56], and the scratch behavior of Ce-doped YAG (Yttrium aluminum garnet, Y3Al5O12) coatings [57].…”

Section: Introductionmentioning

confidence: 99%

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Micromechanical characterization of microwave dielectric ceramic BaO–Sm ₂O ₃–5TiO ₂ by indentation and scratch methods

Liu¹,

Xu²

2023

Journal of Advanced Ceramics

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Mechanical characterization of dielectric ceramics, which have drawn extensive attention in wireless communication, remains challenging. Micromechanical properties with microstructures of dielectric ceramic BaO-Sm2O3-5TiO2 (BST) were assessed by nanoindentation, microhardness, and microscratch tests under different indenters, along with X-ray diffraction, scanning electron microscopy, and Raman spectroscopy. Accurate determination of elastic modulus (i.e., 260 GPa) and indentation hardness (i.e., J u s t A c c e p t e d 16.2 GPa) of brittle BST ceramic by instrumented indentation technique requires low loads with little indentation-induced damage. Elastic modulus and indentation hardness were analyzed by different methodologies such as energybased and displacement-based approaches, and elastic recovery of Knoop imprint. Consistent values (about 3.1 MPa·m 1/2 ) of fracture toughness of BST ceramic were obtained by different methods such as Vickers indenter-induced cracking method, energy-based nanoindentation approaches, and linear elastic fracture mechanics-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 is caused by indentation-induced damage, and can be used to determine fracture toughness of material by energy-based nanoindentation approaches, and the critical void volume fraction 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 fracture toughness of brittle solids, opening new venues of application of nanoindentation test as a means to characterize fracture toughness of brittle ceramics.

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“…where EIT and ν = 0.2 [7] are elastic modulus and Poisson's ratio of BST ceramic, respectively; Ei = 1141 GPa, and νi = 0.07 are elastic modulus and Poisson's ratio of…”

Section: Oliver and Pharr Methods For Analyzing Instrumented Indentationmentioning

confidence: 99%

Section: J U S T a C C E P T E Dmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Micromechanical characterization of microwave dielectric ceramic BaO–Sm ₂O ₃–5TiO ₂ by indentation and scratch methods

Liu¹,

Xu²

2023

Journal of Advanced Ceramics

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show abstract

“…Another technique to evaluate the fracture toughness of a wide range of materials including ceramics, metals, and polymers is the nano-scratch test [22]. Four scratchbased methods have been utilized to calculate the fracture toughness: one is derived from linear-elastic fracture mechanics (LEFM), and the other three methods are developed on microscopic energetic size effect laws (MESEL) [24]. It is well-established that LEFM is applicable to brittle materials such as ceramics and glasses [24].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Fracture Toughness of Plasma Electrolytic Oxidized Al2O3-ZrO2 Coatings Utilizing Nano-Scratch Technique

et al. 2023

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Al2O3 coatings, which can be produced by plasma electrolytic oxidation (PEO) on aluminum substrates, provide an excellent protection against corrosion and wear. However, due to the brittle nature of the oxide ceramic, the fracture toughness is limited. One approach to enhance the tolerance to fracture is the incorporation of ZrO2 to form zirconia toughened alumina (ZTA). In addition to its use as a bulk material, the application as a coating material enables a broader field of application. In this study, an Al2O3-ZrO2 composite coating was applied on a 6082 aluminum alloy using an aluminate-phosphate-based electrolytic solution containing a Zr-based salt. Polarization measurement as an indicator of the passivability of a given system revealed that Zr-based salt improves the passivation of the aluminum alloy. The coatings’ characteristics were evaluated by SEM, EDS, and XRD. ZrO2 incorporated into alumina as a metastable high-temperature modification led to a thicker coating with new morphologies including lamellar and dendritic structures. Nano-indentation showed that the incorporated Zr increase the average hardness of the compact layer from 16 GPa to 18 GPa. The fracture toughness of the coatings was investigated locally with nano-scratches applied on the compact outer layer of the coatings’ cross-sections. The Zr-containing electrolytic solution resulted in a coating with significantly higher fracture toughness (6.9 MPa∙m1/2) in comparison with the Zr-free electrolytic solution (4.6 MPa∙m1/2). Therefore, it is shown, that the PEO process stabilized a high-temperature allotrope of zirconia at room temperature without the need for rare-earth dopants such as Y2O3. Furthermore, it was demonstrated that the nano-scratch method is a suitable and accurate technique for the investigation of the fracture toughness of coatings with inherent cracks.

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Effects of sliding velocity on microscratch responses of thermoplastics by Berkovich indenter

Liu

Wang

2022

Polym. Bull.

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Micromechanical and microstructure characterization of BaO-Sm2O3–5TiO2 ceramic with addition of Al2O3

Cited by 28 publications

References 99 publications

Micromechanical characterization of microwave dielectric ceramic BaO–Sm ₂O ₃–5TiO ₂ by indentation and scratch methods

Micromechanical characterization of microwave dielectric ceramic BaO–Sm ₂O ₃–5TiO ₂ by indentation and scratch methods

Evaluation of Fracture Toughness of Plasma Electrolytic Oxidized Al2O3-ZrO2 Coatings Utilizing Nano-Scratch Technique

Effects of sliding velocity on microscratch responses of thermoplastics by Berkovich indenter

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Micromechanical and microstructure characterization of BaO-Sm2O3–5TiO2 ceramic with addition of Al2O3

Cited by 28 publications

References 99 publications

Micromechanical characterization of microwave dielectric ceramic BaO–Sm 2O 3–5TiO 2 by indentation and scratch methods

Micromechanical characterization of microwave dielectric ceramic BaO–Sm 2O 3–5TiO 2 by indentation and scratch methods

Evaluation of Fracture Toughness of Plasma Electrolytic Oxidized Al2O3-ZrO2 Coatings Utilizing Nano-Scratch Technique

Effects of sliding velocity on microscratch responses of thermoplastics by Berkovich indenter

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Micromechanical characterization of microwave dielectric ceramic BaO–Sm ₂O ₃–5TiO ₂ by indentation and scratch methods

Micromechanical characterization of microwave dielectric ceramic BaO–Sm ₂O ₃–5TiO ₂ by indentation and scratch methods