Erosion/Oxidation Resistant Coatings for High Temperature Polymer Composites

Ivosevic, M.; Knight, Richard; Kalidindi, Surya R.; Palmese, Giuseppe R.; Sutter, James K.

doi:10.1177/09540083030154007

Cited by 19 publications

(3 citation statements)

References 3 publications

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“…Polyimides are used safely in extreme thermomechanical and chemical conditions, thanks to their high glass transition temperature and low creep properties [21]. Practical uses of polyimide films include electronic circuits, wire insulations, and composite components in aero-engines, turbine blades, and launch vehicles [22][23][24][25]. We elect to test polyimide samples for several reasons.…”

Section: Methodsmentioning

confidence: 99%

Experimental Investigation of Energy Dissipation in Presliding Spherical Contacts Under Varying Normal and Tangential Loads

Usta

Shinde

Eriten

2017

Journal of Tribology

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Interfacial damping in assembled structures is difficult to predict and control since it depends on numerous system parameters such as elastic mismatch, roughness, contact geometry, and loading profiles. Most recently, phase difference between normal and tangential force oscillations has been shown to have a significant effect on interfacial damping. In this study, we conduct microscale (asperity-scale) experiments to investigate the influence of magnitude and phase difference of normal and tangential force oscillations on the energy dissipation in presliding spherical contacts. Our results show that energy dissipation increases with increasing normal preload fluctuations and phase difference. This increase is more prominent for higher tangential force fluctuations, thanks to larger frictional slip along the contact interface. We also show that the energy dissipation and tangential fluctuations are related through a power law. The power exponents we identify from the experiments reveal that contacts deliver a nonlinear damping for all normal preload fluctuation amplitudes and phase differences investigated. This is in line with the damping uncertainties and nonlinearities observed in structural dynamics community.

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Section: Methodsmentioning

confidence: 99%

Experimental Investigation of Energy Dissipation in Presliding Spherical Contacts Under Varying Normal and Tangential Loads

Usta

Shinde

Eriten

2017

Journal of Tribology

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“…The effectiveness and life of the coatings depend on the inherent properties of the coating material (thermal stability, compactness, and uniformity) as well as the interaction between the coating and the PMC. Hard-coated PMCs can also show improved abrasion resistance. , …”

Section: Introductionmentioning

confidence: 99%

Titania Deposition on PMR-15

Pizem¹,

Gershevitz²,

Goffer³

et al. 2005

Chem. Mater.

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The formation, degree of crystallinity, and adherence of dense titania (TiO 2 ) thin film coatings on a high-temperature polyimide resin (PMR-15) can be influenced by the chemical composition of the polymer surface. Furthermore, solution deposition conditions can be adjusted to provide additional control over the morphology and crystallinity of the titania films. Recipes for solution-based titania deposition that used a slowly hydrolyzing titanium fluoride salt in the presence of boric acid as a fluoride scavenger allowed growth of films up to 750 nm thick in 22 h. By adjusting solution pH and temperature, either amorphous titania or oriented crystalline anatase films could be formed. Surface sulfonate groups enhance the adhesion of solution-deposited oxide thin film coatings. While most sulfonation procedures severely damaged the PMR-15 surface, the use of chlorosulfonic acid followed by hydrolysis of the installed chlorosulfonyl groups provided effective surface sulfonation without significant surface damage. In some cases, the oxide deposition solution caused partial hydrolysis of the polymer surface, which itself was sufficient to allow adhesion of the titania film through chelation of titanium ions by exposed benzoic acid groups on the polymer surface.

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“…To reduce the residual stresses between polymer substrate and ceramic coating the use of ceramic TC having the CTE close to that of the polymer substrate would promote thermal shock resistance [372]. The group around Ivosevic [96,[373][374][375] initiated the studies of FGC on PMC substrates. They used HVOF sprayed graded polyamide/WC-Co coatings to improve adhesion between carbon reinforced PMC substrate and WC-Co top coatings [96].…”

Section: Polymers As Substratesmentioning

confidence: 99%

Review of Functionally Graded Thermal Sprayed Coatings

et al. 2020

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The paper briefly describes major thermal spray techniques used to spray functionally graded coatings such as atmospheric plasma spraying, high velocity oxy-fuel spraying, suspension and solution precursor plasma spraying, and finally low and high pressure cold gas spray method. The examples of combined spray processes as well as some examples of post spray treatment including laser and high temperature treatments or mechanical one, are described. Then, the solid and liquid feedstocks used to spray and their properties are shortly discussed. The reviewed properties of functional coatings include: (i) mechanical (adhesion, toughness, hardness); (ii) physical (porosity, thermal conductivity and diffusivity, thermal expansion, photo-catalytic activity), and; (iii) bioactivity and simulated body fluid (SBF) corrosion. These properties are useful in present applications of functionally graded coatings as thermal barriers, the bioactive coatings in prostheses, photo-catalytic coatings in water treatment, coatings used in printing industry (anilox and corona rolls). Finally, some of the future possible fields of functional thermal sprayed coatings applications are discussed, e.g., to coat polymer substrates or to use the cheap technology of low pressure cold gas spray method instead of expensive technology of vacuum plasma spraying to obtain bond coatings.

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Erosion/Oxidation Resistant Coatings for High Temperature Polymer Composites

Cited by 19 publications

References 3 publications

Experimental Investigation of Energy Dissipation in Presliding Spherical Contacts Under Varying Normal and Tangential Loads

Experimental Investigation of Energy Dissipation in Presliding Spherical Contacts Under Varying Normal and Tangential Loads

Titania Deposition on PMR-15

Review of Functionally Graded Thermal Sprayed Coatings

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