Room Temperature Deformation Mechanisms of Alumina Particles Observed from In Situ Micro-compression and Atomistic Simulations

Sarobol, Pylin; Chandross, Michael; Carroll, Jay; Mook, William; Bufford, Daniel Charles; Boyce, Brad Lee; Hattar, Khalid Mikhiel; Kotula, Paul Gabriel; Hall, Aaron Christopher.

doi:10.1007/s11666-015-0295-2

Cited by 40 publications

(27 citation statements)

References 32 publications

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“…[ 19–21 ] Particle fracturing occurs along the grain boundaries and within the grains generating temporarily unsaturated surface bonds that cause an excellent adherence of the particles. [ 22 ]…”

Section: Introductionmentioning

confidence: 99%

Laser‐Annealing of Thermoelectric CuFe_0.98Sn_0.02O₂ Films Produced by Powder Aerosol Deposition Method

Nazarenus

Kita

Moos

et al. 2020

Adv Materials Inter

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of thermal to electrical energy and vice versa. The state-of-the-art material for thermoelectric generators (TEG) is bismuth telluride (Bi 2 Te 3); however, its application is limited due to its high costs and tendency to oxidize at elevated temperatures. Copper-iron-oxides are a thermally stable promising alternative due to the low costs of the raw materials, their high Seebeck coefficient, and their high electrical conductivity. The PAD method enables to form dense nanocrystalline ceramic films on a variety of substrates with high deposition rates. [16-18] In contrast to all other ceramic processing routes, even moisture-sensitive ceramics, or ceramics with high sintering temperatures can be fabricated at room temperature (RT). [11] Besides the dry ceramic powder, neither additional binders nor other liquids are needed. The ceramic particles are accelerated towards a substrate by a pressure difference. The kinetic energy of the particles is converted into bonding energy during their impact on the substrate and comes along with the reduction of the crystallite size and formation of microstrain within the atomic lattice. [19-21] Particle fracturing occurs along the grain boundaries and within the grains generating temporarily unsaturated surface bonds that cause an excellent adherence of the particles. [22] Despite all the positive aspects of the powder aerosol deposition summarized in Figure 1, a major disadvantage in the as-deposited state that all PAD films have in common is the reduced electrical conductivity of the films. A thermal annealing step is necessary to reduce the mechanical stress of the film and to restore the electrical properties so that they reach bulk values. Exner et al. recently found out that the required annealing temperature in the furnace depends on the melting point of the functional ceramic materials, though it is significantly lower than the typical sintering temperatures. [23] In contrast, laser-based annealing could provide additional advantages like a reduced annealing time or a targeted local property change as it was shown by Palneedi et al. for PZT (Pb(Zr,Ti)O 3) [24-30] and Shinonaga et al. for TiO 2. [31-33] In this study, we investigated the influence of laser irradiation on the properties of a nanocrystalline thermoelectric film. Tin doped copper-iron-oxide respectively copper delafossite (CuFe 0.98 Sn 0.02 O 2), which is known for its good thermoelectric properties and is processability by PAD, [15,34] was synthesized by the mixed-oxide-route. Films were fabricated by powder aerosol deposition method. After deposition, the films were annealed with a frequency tripled Nd:YAG laser (λ = 355 nm) and its influence on the microstructure and the electrical properties was examined by optical and electrical measurements. Powder aerosol deposition (PAD) is a unique coating method that allows the fabrication of dense ceramic films on a variety of substrates at room temperature. This spraying process can produce film thicknesses of several micrometers within minutes without the use of...

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Section: Introductionmentioning

confidence: 99%

Laser‐Annealing of Thermoelectric CuFe_0.98Sn_0.02O₂ Films Produced by Powder Aerosol Deposition Method

Nazarenus

Kita

Moos

et al. 2020

Adv Materials Inter

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show abstract

“…For more than a decade, an increasing number of publications report plastic-like deformation in quasi-static micro-pillar compression as soon as the respective pillar diameters fall below material-dependent critical sizes (Ref [1][2][3][4][5]. A similar behavior is observed during the quasi-static compression testing of ceramic powder particles (Ref [6][7][8].…”

Section: General Aspects In Deformation Of Brittle Materialsmentioning

confidence: 70%

Kinetic Spraying of Brittle Materials: From Layer Formation to Applications in Aerosol Deposition and Cold Gas Spraying

2021

J Therm Spray Tech

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This special issue of the Journal of Thermal Spray Technology focuses on kinetic spraying processes of mainly brittle materials. The definition of ''kinetic spraying'' involves the impact of materials in the solid state as expressed by technical terms as ''aerosol deposition'' (AD), ''vacuum kinetic spray,'' ''granule spray in vacuum,'' as well as ''cold gas spraying.'' Applying kinetic spraying to brittle materials covers the deposition of ceramics and 123

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“…However, when the particle diameter was 0.3¯m, significant plastic deformation and cracking without fragmentation were observed. 42) In molecular dynamics simulations, it was found that in the compressive deformation of an Al 2 O 3 single crystal having a diameter of 10 nm, undergoes plastic deformation due to the activation of two slip systems. 42) From these observations, it was considered that plastic deformation occurred in the particles.…”

Section: Texture Formation In ¡-Al 2 O 3 Coating By Ad Methodsmentioning

confidence: 99%

“…42) In molecular dynamics simulations, it was found that in the compressive deformation of an Al 2 O 3 single crystal having a diameter of 10 nm, undergoes plastic deformation due to the activation of two slip systems. 42) From these observations, it was considered that plastic deformation occurred in the particles. 5),6),42) Furthermore, in an investigation of the texture of a coating obtained by deposition of Ni powder by AD at a nozzle angle of 90°, a {011} fiber texture was produced, which is almost the same as that obtained by uniaxial deformation of Ni bulk material.…”

Section: Texture Formation In ¡-Al 2 O 3 Coating By Ad Methodsmentioning

confidence: 99%

Formation mechanism of texture in α-alumina coatings produced by aerosol deposition

Hasegawa

Komuro

Kimura

et al. 2021

J. Ceram. Soc. Japan

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Room Temperature Deformation Mechanisms of Alumina Particles Observed from In Situ Micro-compression and Atomistic Simulations

Cited by 40 publications

References 32 publications

Laser‐Annealing of Thermoelectric CuFe_0.98Sn_0.02O₂ Films Produced by Powder Aerosol Deposition Method

Laser‐Annealing of Thermoelectric CuFe_0.98Sn_0.02O₂ Films Produced by Powder Aerosol Deposition Method

Kinetic Spraying of Brittle Materials: From Layer Formation to Applications in Aerosol Deposition and Cold Gas Spraying

Formation mechanism of texture in α-alumina coatings produced by aerosol deposition

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Room Temperature Deformation Mechanisms of Alumina Particles Observed from In Situ Micro-compression and Atomistic Simulations

Cited by 40 publications

References 32 publications

Laser‐Annealing of Thermoelectric CuFe0.98Sn0.02O2 Films Produced by Powder Aerosol Deposition Method

Laser‐Annealing of Thermoelectric CuFe0.98Sn0.02O2 Films Produced by Powder Aerosol Deposition Method

Kinetic Spraying of Brittle Materials: From Layer Formation to Applications in Aerosol Deposition and Cold Gas Spraying

Formation mechanism of texture in α-alumina coatings produced by aerosol deposition

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Product

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Laser‐Annealing of Thermoelectric CuFe_0.98Sn_0.02O₂ Films Produced by Powder Aerosol Deposition Method

Laser‐Annealing of Thermoelectric CuFe_0.98Sn_0.02O₂ Films Produced by Powder Aerosol Deposition Method