Gradient protective coatings of different application produced by EB-PVD

Movchan, B. A.; Marinski, G. S.

doi:10.1016/s0257-8972(97)00639-7

Cited by 22 publications

(10 citation statements)

References 2 publications

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“…Due to different saturated vapor pressure between Ti and Al elements, Al atoms will precede Ti atoms to evaporate and deposit on substrate surface. According to an empirical parameter proposed by Zinsmeister, 15) Ti-Al alloy's ability to fractionate can be characterizes by K as described with formula (1):…”

Section: Microstructure and Phasementioning

confidence: 99%

Mechanical Properties and Fracture Behavior of Titanium-Aluminum/Titanium Micro-Laminate Sheet Deposited by EB-PVD

Wang

2015

Mater. Trans.

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A 110 µm thick micro-laminate sheet comprising 14 layers of TiAl/Ti 3 Al two phase compound and 15 layers of Ti was prepared by electron beam physical vapor deposition (EB-PVD), and its microstructures and mechanical properties were characterized. Results show that the hardness of interfacial region is about 7.029 GPa, higher than that of either component layer. After densification, room-temperature tensile strength and elongation are improved compared to single Ti-Al compound sample, reaching 656.89 MPa and 2.92%, respectively. Its tensile curve presents a distinct jagged feature. High-temperature tensile strength exhibits an abnormal increase with temperature, exceeding 440 MPa at 1023 K. The presence of Ti layers will lead to cracks stagger along the inter-laminar interface or the crack deflection and the micro-bridge connection caused by Ti layers, due to the TiAl-Ti 3 Al/¡-Ti micro-laminate displaying a fine characteristic of delayed fracture.

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Section: Microstructure and Phasementioning

confidence: 99%

Mechanical Properties and Fracture Behavior of Titanium-Aluminum/Titanium Micro-Laminate Sheet Deposited by EB-PVD

Wang

2015

Mater. Trans.

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“…50,51 Gradients can be established through thermodynamic means, such as the minimization of interfacial energies 50,52 through externally applied forces such as a magnetic field, 51,53 or through specialized manufacturing techniques. 54,55 Our group has recently used a bilayer structure to prepare ice-shedding coatings with low ice adhesion strengths and good mechanical properties. 56 These coatings were made by cross-linking together two polyols, one of which possessed poly(dimethyl siloxane) (PDMS) side chains.…”

Section: ■ Introductionmentioning

confidence: 99%

Robust Polyurethane Coatings with Lightly Cross-Linked Surfaces for Ice Shedding

Becher‐Nienhaus

Liu

Buddingh

et al. 2023

ACS Appl. Polym. Mater.

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A highly cross-linked coating tends to have a high shear modulus and ice adhesion strength, while a lightly crosslinked rubber lacks wear resistance but sheds ice readily. This paper reports a polyurethane (PU) coating that is heavily crosslinked in the bulk but is lightly cross-linked near its surface (LICROS) for ice shedding. To achieve this, two methacrylate polyols (P1 and P2) are synthesized by free radical polymerization. Of the polyols, P1 is rich in cross-linkable 2-hydroxyethyl methacrylate (HEMA) units and P2 is rich in non-cross-linkable 2-ethylhexyl methacrylate (EHMA) units and also contains 4.1 mol % of 2-(perfluorohexyl)ethyl methacrylate (FC 6 -MA) units. Solvent evaporation from a solution mixture of P1, P2, and a hexamethylene diisocyanate trimer (HDIT) causes P2 to stratify to the coating's surface due to the low surface tension of FC 6 -MA. After thermal curing and lubrication with dibutyl phthalate (DBP), the resulting LICROS coatings feature ice adhesion values (τ) that are around one-fourth of those measured on the homogeneous PU coating derived from curing P1 with HDIT. However, the τ values of the DBP-lubricated coatings quickly increase with the number of icing/de-icing cycles presumably due to the shedding of the highly swollen surface layer with ice removal. The lubrication of an optimized LICROS coating with acetyl tributyl citrate (ATBC), which swells the coating much less than DBP, sustains low τ values of ∼60 kPa for 15 icing/de-icing cycles without showing signs of deterioration. LICROS coatings have nanoindentation hardness and wear resistance comparable with those of the cured homogeneous P1 coating but much better than those of the cured P2 coating. Since a robust LICROS coating can be made from P1 and P2 at a mass ratio of 97.5/2.5, the weight fraction of the expensive FC 6 -MA component used in the final coating is only 0.12%. Thus, this paper reports an approach to making inexpensive coatings with low ice adhesions but high wear resistance.

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“…As it is well-known, the mechanical properties and the crack problems are the most uncontrollable problems for the coatings. Furthermore, there is no doubt that the thermal and mechanical mismatches of the interface caused by the differences of atomic structure, chemical composition, and atomic bonding between the reinforcing coating and substrate are the main reasons for damage to the composite [11][12][13]. Although the interface structure's influence on the coating structure cannot be accurately described, the microstructure of the coating has a direct effect on the microstructure of the coating in the process of remelting, thereby affecting the performance of the coating [14].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Laser Power on the Interface Microstructure of a Laser Remelting Nano-SiC Modified Fe-Based Ni/WC Composite Coating

Zhao

et al. 2018

Coatings

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The plasma sprayed Fe-based Ni/WC composite coating on the surface of 45 steel was post-treated by laser remelting with the addition of nano-SiC. The effect of laser power on the interface microstructure of a laser remelting nano-SiC modified Fe-based Ni/WC composite coatings were researched. The metallographic structure, microscopic morphology, phase composition, and microhardness of the remelted layer were visually analyzed by metallographic microscope, scanning electron microscope (SEM), X-ray diffractometer (XRD), and microhardness tester, respectively. The results showed that the nano-SiC modified remelted coating was smooth and compact, and with no fine cracks. The remelted layer was mainly composed of [Fe,Ni], Cr, Fe0.04Ni0.36 phase. The metal elements Fe, Ni, Cr, and Si, and non-metallic element C, appeared to diffuse, and there was metallurgical bonding between the coating and the matrix. With the increase of laser power, the smaller the average grain size, the wider the half-peak height (FWHM), and the more obvious the grain refinement. When the laser power was 500 W, the interface metallurgical showed the best effect. Furthermore, the nano-sized SiC particles served as the core of the heterogeneous nucleation to refine the grains on the one hand, and promoted the formation of a hard intermediate phase in the coating on the other hand. Therefore, the laser remelting and the addition of nano-SiC particles greatly improved the microhardness of the coating. The larger the laser power, the smaller the microstructure characteristics and the fewer the number of holes. With increasing laser power, the hardness increased in general terms and the maximum hardness increased by 51%.

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Gradient protective coatings of different application produced by EB-PVD

Cited by 22 publications

References 2 publications

Mechanical Properties and Fracture Behavior of Titanium-Aluminum/Titanium Micro-Laminate Sheet Deposited by EB-PVD

Mechanical Properties and Fracture Behavior of Titanium-Aluminum/Titanium Micro-Laminate Sheet Deposited by EB-PVD

Robust Polyurethane Coatings with Lightly Cross-Linked Surfaces for Ice Shedding

The Effect of Laser Power on the Interface Microstructure of a Laser Remelting Nano-SiC Modified Fe-Based Ni/WC Composite Coating

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