Mechanical Properties of Coatings

Tushinsky, L.I.; Kovensky, Iliya; Plokhov, Alexandr; Sindeyev, Victor; Reshedko, Peter

doi:10.1007/978-3-662-06276-0_2

Cited by 8 publications

(5 citation statements)

References 51 publications

(2 reference statements)

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“…And here, the method of research into coatings was used, which was used in earlier works of the V.P. Larionov Institute of Physical and Technical Problems of the North, SB RAS [8][9][10][11]. For technical purposes it is advisable to exclude expensive separation of rare-earth metals, therefore, concentrates obtained from samples of the Tomtor deposit by alkaline decomposition with phosphorus elimination and extraction of rare-earth metals containing (in%): Nb2O5 -from 5.03 to 13.56 were used as a modifying additive.…”

Section: Materials and Methods Of Experimental Researchmentioning

confidence: 99%

Application of Complex Concentrate of Rare-Earth Elements for Obtaining Electrometallic Coatings

Struchkov

Vinokurov

Кычкин

2020

MSF

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The unique physical and chemical characteristics of rare earth elements make them attractive for use in a number of existing and innovative production lines. The use of complex concentrates of various deposits to obtain new materials is a promising area of modern materials science. The article presents the results of studies of electroarc metallization coatings of flux-cored wires with modifying additives. As additives, a complex concentrate of rare-earth metals from the deposits of the Republic of Sakha (Yakutia) and other modifying powders were used to obtain hardening phases. To determine the optimal composition of the modifying additives, various compositions of cored wires were made. An analysis of the structure of coatings showed a uniform distribution of the main elements of the cored wire, as well as a local distribution of unmelted particles of the modifying additives. The levels of open porosity and microhardness of the phase components of the coatings are determined. The prospects of using complex concentrate with rare-earth elements from deposits of the Republic of Sakha (Yakutia) as modifying additives for coatings with enhanced performance properties is shown.

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Section: Materials and Methods Of Experimental Researchmentioning

confidence: 99%

Application of Complex Concentrate of Rare-Earth Elements for Obtaining Electrometallic Coatings

Struchkov

Vinokurov

Кычкин

2020

MSF

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“…Microhardness of samples was determined by Vickers indentation method using ПМТ-3 at loads 20 and 100 g. The hardness number (HV, kg•mm -2 ) is determined by the load (F, kg) over the surface area of the indentation (mm 2 ). For a number of samples the value of micro-hardness (H) was determined also by Khrushchev-Berkovich method using the formula Н = (1854×100)/C 2 , where C is the diagonal of impression of micrometer eyepiece at 100 g load [29]. Mechanical properties of fabricated samples were studied by measuring internal friction (Q -1 ) and Young modulus (E) using the acoustic spectrometer (Andronikashvili Institute of Physics, Georgia).…”

Section: Methodsmentioning

confidence: 99%

Fabrication of Cu-W Nanocomposites by Integration of Self-Propagating High-Temperature Synthesis and Hot Explosive Consolidation Technologies

Aydinyan

Kirakosyan

Zakaryan

et al. 2018

Eurasian Chem. Tech. J.

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Manufacturing W-Cu composite nanopowders was performed via joint reduction of CuO and WO3 oxides with various ratios (W:Cu = 2:1, 1:1, 1:3, 1:13.5) using combined Mg–C reducer. Combustion synthesis was used to synthesize homogeneous composite powders of W-Cu and hot explosive consolidation (HEC) technique was utilized to fabricate dense compacts from ultrafine structured W-Cu powders. Compact samples obtained from nanometer sized SHS powders demonstrated weak relation between the susceptibility and the applied magnetic field in comparison with the W and Cu containing micrometer grain size of metals. The density, microstructural uniformity and mechanical properties of SHS&HEC prepared samples were also evaluated. Internal friction (Q-1) and Young modulus (E) of fabricated composites studied for all samples indicated that the temperature 1000 °С is optimal for full annealing of microscopic defects of structure and internal stresses. Improved characteristics for Young modulus and internal friction were obtained for the W:Cu = 1:13.5 composite. According to microhardness measurement results, W-Cu nanopowders obtained by SHS method and compacted by HEC technology were characterized by enhanced (up to 85%) microhardness.

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“…Additionally, the viscosity of coatings may also vary throughout different depths, relative to the free surface, due to gradients in the solvent concentration as it diffuses through the film and evaporates . The reduction in the solvent content with time can result in microstructure formation (i.e., polymer entanglement), leading to sufficient coating elasticity, allowing the material to resist changes in its volume or shape under mechanical stresses such as gravity . Furthermore, the elastic response of a material is related to its yield stress, which can affect the flow properties and formation of sag .…”

Section: Introductionmentioning

confidence: 99%

“…6 The reduction in the solvent content with time can result in microstructure formation (i.e., polymer entanglement), leading to sufficient coating elasticity, 7 allowing the material to resist changes in its volume or shape under mechanical stresses such as gravity. 8 Furthermore, the elastic response of a material is related to its yield stress, which can affect the flow properties and formation of sag. 9 Considering the energy-intensive nature of the application stage for automotive coatings, the need for accurate inspection to enable a priori prediction of the coating performance is crucial.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Sag Tracking in Falling Liquid Films

Issa

Roffin

et al. 2022

Langmuir

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Coating defects often arise during application in the flash stage, which constitutes the ∼10 min interval immediately following film application when the solvent evaporates. Understanding the transient rheology and kinematics of a coating system is necessary to avoid defects such as sag, which results in undesirable appearance. A new technique named variable angle inspection microscopy (VAIM) aimed at measuring these phenomena was developed and is summarized herein. The essence of this new, non-invasive, rheological technique is the measurement of a flow field in response to a known gravitational stress. VAIM was used to measure the flow profile through a volume of a liquid thin film at an arbitrary orientation. Flow kinematics of the falling thin film was inferred from particle tracking measurements. Initial benchmarking measurements in the absence of drying tracked the velocity of silica probe particles in ∼140 μm thick films of known viscosity, much greater than water, at incline angles of 5°a nd 10°. Probe particles were tracked through the entire thickness of the film and at speeds as high as ∼100 μm/s. The sag flow field was well resolved in ∼10 μm thick cross sections, and in general the VAIM measurements were highly reproducible. Complementary profilometer measurements of film thinning were utilized to predict sag velocities with a known model. The model predictions showed good agreement with measurements, which validated the effectiveness of this new method in relating material properties and flow kinematics.

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Mechanical Properties of Coatings

Cited by 8 publications

References 51 publications

Application of Complex Concentrate of Rare-Earth Elements for Obtaining Electrometallic Coatings

Application of Complex Concentrate of Rare-Earth Elements for Obtaining Electrometallic Coatings

Fabrication of Cu-W Nanocomposites by Integration of Self-Propagating High-Temperature Synthesis and Hot Explosive Consolidation Technologies

Three-Dimensional Sag Tracking in Falling Liquid Films

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