Constrained sintering of alumina stripe patterns on rigid substrates: Effect of stripe geometry

Jamin, Christine; Rasp, Tobias; Kraft, Torsten; Guillon, Olivier

doi:10.1016/j.jeurceramsoc.2013.06.016

Cited by 13 publications

(19 citation statements)

References 28 publications

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“…This is likely due to the in-plane biaxial stresses developed during sintering by the variation in the sintering rates between the two layers, which can influence the sintering potential of each constituent [46]. Investigations by Jamin et al [47], for example, show the sintering behavior of alumina patterns deposited on sapphire substrates, where the biaxial tensile lateral sintering strain reduced the relative density and resulted in a local density gradient. In this configuration, densification occurs primarily through the thickness of the film.…”

Section: A Microstructurementioning

confidence: 99%

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Ayrikyan

Rojas

Molina‐Luna

et al. 2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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The macroscopic electromechanical behavior of lead-free bilayer composites was characterized at room temperature. One layer consisted of a nonergodic relaxor, (Bi1/2Na1/2)TiO3-7BaTiO3, with an electric-field-induced longrange ferroelectric order, whereas the other is understood to be an ergodic relaxor [(Bi1/2Na1/2)TiO3-25SrTiO3] that undergoes a reversible electric-field-induced macroscopic nonpolar-to-polar transition. Microstructural evidence of a bilayer with low diffusion between the two components is also demonstrated. By taking advantage of the different macroscopic strain- and polarization-electric-field responses of the two constituents, internal mechanical and electrical fields can be developed that enhance the unipolar strain over that expected by a rule of mixtures approximation, thereby improving the properties needed for application of such materials to actuator systems. It is possible through further tailoring of the volume fractions and macroscopic properties of the constituents to optimize the electromechanical properties of multilayer lead-free ferroelectrics.

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Section: A Microstructurementioning

confidence: 99%

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Ayrikyan

Rojas

Molina‐Luna

et al. 2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…As sintering is a diffusion‐controlled process, any influence on ionic mobility will also likely influence the microstructure, i.e., grain and pore size and morphology as well as diffusion at the interface. Such effects have been observed in thin ceramic films sintered on dense substrates, where due to the densification of the film, large internal tensile stresses were found that influenced the porosity and grain size.…”

Section: Resultsmentioning

confidence: 73%

Multilayer lead‐free piezoceramic composites: Influence of co‐firing on microstructure and electromechanical behavior

et al. 2017

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In this study lead-free 2-2 and 0-3 ceramic/ceramic composites comprised of the non-ergodic relaxor 0.93(Bi 1/2 Na 1/2 )TiO 3 -0.07BaTiO 3 and ergodic relaxor 0.94Bi 0.5 (Na 0.75 K 0.25 ) 0.5 TiO 3 -0.06BiAlO 3 were investigated. The macroscopic electromechanical behavior was characterized as a function of continuent content, revealing an enhancement in the unipolar strain from the multilayer composite structure. Systematic evaluation of the effects of co-sintering on microstructural properties, such as grain size and porosity, revealed potential mechanisms by which the increase in unipolar strain was achieved. In addition, interdiffusion between the constituents was observed, providing evidence for the formation of a functionally graded ceramic by co-sintering. These data are contrasted with highresolution energy dispersive X-ray microanalysis for measurement of chemical composition across the interface of 2-2 ceramics. These findings provide insight into how synthesis routes can be optimized for tailoring the enhancement of electromechanical properties of lead-free electroceramic composite systems. K E Y W O R D S composites, ferroelectricity/ferroelectric materials, laminates, piezoelectric materials/properties, sinter/ sintering

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“…In a recent paper, the influence of finite lateral dimensions on the constrained sintering has been investigated . The high‐density edge zone has been found to become dominant in narrow film stripes, causing nonzero lateral strain that can reach the same order of magnitude as the vertical, out‐of‐substrate plane strain.…”

Section: Introductionmentioning

confidence: 99%

“…Both experiments and simulations have shown that the effect of imperfect constraints at the film edge exhibit a dependency on the stripe geometry. However, no information on the influence of substrate roughness or material is available.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, the influence of the substrate properties on the degree of constraint and thus on the sintering behavior of ceramic stripes is studied in experiment and simulation by sintering thin stripes of varied geometry on rough substrates. The study consists of two parts: First, experimental data and simulation results are compared to former findings about sintering of thin stripes on smooth substrate from a previously published work regarding strain, delamination and density data. After that, the effect of metallic interlayers on stripe sintering behavior is systematically analyzed and the influence of finite film dimensions on delamination, strain and microstructural anisotropy are described.…”

Section: Introductionmentioning

confidence: 99%

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Constrained Sintering of Alumina Stripes on Rigid Substrates: Effect of Substrate Roughness and Coating

et al. 2015

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Micromolding in capillaries has been used to fabricate alumina stripes on smooth (R a = 0.5 nm) and rough substrates (R a = 900 nm). Different lateral (10-500 lm) and vertical stripe dimensions (8-27 lm) were used to study the influence of substrate roughness (smooth and rough sapphire) and substrate material (platinum coated and plain sapphire) on sintering behavior. Alumina stripes experience edge delamination during sintering on a rigid substrate independent of substrate roughness. However, enhanced substrate roughness reduced delamination length by half and lowered lateral strains by up to 0.10. Grooves in the rough substrate were found to be responsible for this feature as they act as crack propagation barriers and generate local density minima. Accompanying discrete element simulations revealed a localized triaxial stress state at the grooves of a sinusoidal-shaped substrate interface as the main cause of the density minima. Platinum interlayers also resulted in reduced delamination by 40% in some stripe geometries while density was enhanced by 4% and lateral strains doubled in some geometries. Creep of the metal layer during sintering is thought to be the reason for this seemingly contradictory behavior.

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Constrained sintering of alumina stripe patterns on rigid substrates: Effect of stripe geometry

Cited by 13 publications

References 28 publications

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Multilayer lead‐free piezoceramic composites: Influence of co‐firing on microstructure and electromechanical behavior

Constrained Sintering of Alumina Stripes on Rigid Substrates: Effect of Substrate Roughness and Coating

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