Compressive stress in nano-crystalline titanium dioxide films by aerosol deposition

Adamczyk, Jesse M.; Fuierer, Paul

doi:10.1016/j.surfcoat.2018.07.015

Cited by 29 publications

(20 citation statements)

References 33 publications

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“…Owing to the strong impaction during deposition, PAD films may exhibit certain distorted crystal regions up to a degree of complete amorphization. [ 33,66 ] Furthermore, there are high internal compressive strains that are present as isotropic biaxial stresses [ 71 ] and that can reach values of up to 2 GPa. [ 72 ] A more detailed description of the aerosol deposition process, its deposition mechanism, and the resulting film properties can be found in overview articles of Akedo's group from 2008 [ 12 ] and more recently of our group from 2015.…”

Section: Powder Aerosol Depositionmentioning

confidence: 99%

What Happens during Thermal Post‐Treatment of Powder Aerosol Deposited Functional Ceramic Films? Explanations Based on an Experiment‐Enhanced Literature Survey

et al. 2020

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Powder aerosol deposition (PAD) is a unique ceramic spray coating method that produces dense and well‐adhering thick‐films directly at room temperature, without requiring any heating or sintering. After the successful film formation, mechanical film properties like hardness or plasma resistance are remarkably good. However, when it comes to electrical properties like permittivity or electrical conductivity, the nanocrystalline structure of PAD films combined with high internal strains deteriorates partly the characteristic properties. The electrical conductivity may already be present within the as‐deposited films. However, it is mostly lowered by several orders of magnitude. Therefore, a thermal post‐deposition annealing is oftentimes required. In this work, electrically conducting films produced by powder aerosol deposition are surveyed based on published data. Their microstructural and electrical behavior during the post‐deposition annealing treatment is summarized and reasons for the lowered electrical conductivity are identified. Additionally, the processes taking place during annealing, which eventually allow to regain bulk‐like functional properties, are examined. A universal annealing behavior is found that leads to a quantitative recommendation for the suitable film annealing temperatures to regain the electrical conductivities.

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Section: Powder Aerosol Depositionmentioning

confidence: 99%

What Happens during Thermal Post‐Treatment of Powder Aerosol Deposited Functional Ceramic Films? Explanations Based on an Experiment‐Enhanced Literature Survey

et al. 2020

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“…Several up-to-now-used AD materials, mainly metal oxides resemble lunar soil or dust in their particle size distributions [15,22]. Examples for the successful application of the AD method for the processing of metal oxide powders include, e.g., Fe 2 O 3 [23], SiO 2 [24,25], TiO 2 , [26,27], and Al 2 O 3 [16,28,29], or high temperature superconductors [30]. To the best of the authors’ knowledge, AD is the only process to produce dense ceramic coatings in the specified particle size range directly from dry powder and without any heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing Dense Thick Films of Lunar Regolith Simulant EAC-1 at Room Temperature

et al. 2019

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The Aerosol Deposition (AD, also known as gas kinetic spraying or vacuum deposition) method is a rather novel coating process to produce dense thick films directly from dry ceramic (or metal) powders on a variety of substrates without any heat treatment. Because of the similarity of the up to now used powders and lunar regolith, it is imaginable to use AD systems for future in situ resource utilization missions on the Moon planned by several space agencies. To test the feasibility of such an endeavor, the processability of lunar mare simulant EAC-1 by the AD method has been examined in this study. Three regolith films with an area of 25 × 10 mm2, and thicknesses between 2.50 µm and 5.36 µm have been deposited on steel substrates using a standard AD setup. Deposited films have been investigated by Laser Scanning Microscopy (LSM) and Scanning Electron Microscopy (SEM). Moreover, the roughness and Vickers hardness of the deposited films and the underlying substrates have been measured. It has been shown that dense consolidated films of regolith simulant can be produced within minutes by AD. The deposited films show a higher roughness and, on average, a higher hardness than the steel substrates. Since on the Moon, naturally available regolith powders are abundant and very dry, and since the required process vacuum is available, AD appears to be a very promising method for producing dense coatings in future Moon exploration and utilization missions.

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“…Due to intensive research in the past years, it is now possible to deposit a large number of ceramic powders on various substrate materials (ceramics, 12,13 metals, 1,14 polymers, [15][16][17]. Besides familiar ceramics for the AD such as Al 2 O 3 , 5,[18][19][20] PZT, 2,17,21 BaTiO 3 , [22][23][24] and TiO 2 , 25 further functional ceramics, [26][27][28][29][30][31][32][33][34] and partly exotic materials, such as lunar regolith, 35 can be deposited today. In addition, more and more powder mixtures are being used.…”

Section: Introductionmentioning

confidence: 99%

Powder aerosol deposition method — novel applications in the field of sensing and energy technology

Schubert

Hanft

Nazarenus

et al. 2019

Funct. Mater. Lett.

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The Aerosol Deposition (AD) method is a dry spray coating process for the production of dense ceramic coatings at room temperature directly from the ceramic raw powder. In order to avoid confusion with liquid aerosol technology, the term powder aerosol deposition (PAD) is introduced here, to highlight that the aerosol consists only of ceramic powder and carrier gas. Especially in the field of functional ceramics, PAD is a promising alternative to conventional sinter-based production processes. This review focuses on the PAD of functional ceramics in the field of sensing and energy technology. In this context, especially current developments and trends are presented. On the part of the sensors, gas and temperature sensors are especially considered, whereas in the field of energy technology, the focus is on vibration energy harvesting, thermoelectric generators, superconductors, and solar cells as well as on all solid-state batteries and fuel cells. Besides the different applications of PAD films, this review also highlights opportunities for influencing the film properties by the used powder or the process parameters.

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Compressive stress in nano-crystalline titanium dioxide films by aerosol deposition

Cited by 29 publications

References 33 publications

What Happens during Thermal Post‐Treatment of Powder Aerosol Deposited Functional Ceramic Films? Explanations Based on an Experiment‐Enhanced Literature Survey

What Happens during Thermal Post‐Treatment of Powder Aerosol Deposited Functional Ceramic Films? Explanations Based on an Experiment‐Enhanced Literature Survey

Manufacturing Dense Thick Films of Lunar Regolith Simulant EAC-1 at Room Temperature

Powder aerosol deposition method — novel applications in the field of sensing and energy technology

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