Comparison of ZrB2-MoSi2 Composite Coatings Fabricated by Atmospheric and Vacuum Plasma Spray Processes

Niu, Yaran; Zhong, Wang; Zhao, Jun; Zheng, Xiaofeng; Zeng, Yi; Ding, Chuanxian

doi:10.1007/s11666-016-0490-9

Cited by 29 publications

(6 citation statements)

References 20 publications

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“…The spraying process was carried out in air, and the powder materials reacted with the oxygen to form new phases. ZrO 2 is a reaction product of ZrB 2 particles with oxygen during the deposition process [25,26]. MoO 3 and B 2 O 3 could hardly be detected in the XRD.…”

Section: Resultsmentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure and Phase Composition of ZrB2–MoSi2 Coating

et al. 2019

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Composite ZrB 2 -MoSi 2 coating modified by Y 2 O 3 and Al was prepared by a new multi-chamber detonation accelerator (MCDS) on carbon/carbon composites. Postdeposition heat treatment of the samples at 1500 • C for 1 and 6 h was carried out in air. The effect of heat treatment on the microstructure and phase composition of the ZrB 2 -MoSi 2 coating was investigated by scanning electron microscopy and X-ray diffraction phase analysis. The as-sprayed coating presented as a dense lamellar structure, composed of m-ZrO 2 , t-ZrO 2 , some hexagonal ZrB 2 , and cubic Al phases. The m-ZrO 2 , c-ZrO 2 , and h-(α-Al 2 O 3 ) formed at 1500 • C. The coatings after heat treatment (1 and 6 h) exhibited a structure without cracks. The porosity (~1%) of the coating did not change after heat treatment. Thin, continuous, silica-rich film covered the surfaces of ZrO 2 and Al 2 O 3 particles, and could have played a role during heat treatment by acting as a grain lubricant for particle rearrangement.

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Section: Resultsmentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure and Phase Composition of ZrB2–MoSi2 Coating

et al. 2019

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“…In contrast to other methods, the plasma spray coating technique provides freedom in selecting the substrate and coating powders. Depending on the requirements, the feedstock powder and substrate might be the same material, such as copper on copper or different materials. − These benefits, along with the freedom to choose different materials, make it possible to tune the characteristics of surfaces for various applications, including thermal barrier coating, wear-resistant, antifriction materials, , and more.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics of Pool Boiling with Scalable Plasma-Sprayed Aluminum Coatings

et al. 2023

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To ensure adequate reliability in two-phase cooling systems involving boiling, it is essential to enhance the heat transfer coefficient and maximize the critical heat flux (CHF) limit. A key technique to avoid surface burnout and increase the CHF limit in pool boiling is the frequent coolant supply to the probable dry-out locations. In the present work, we have explored the plasma-spray coating as a surface modification technique for enhancing heat transfer coefficient and CHF value in pool boiling applications. Three plasma-coated aluminum surfaces (C-15, C-20, and C-25) are fabricated on a copper substrate at three different plasma powers of 15, 20, and 25 kW, respectively. Detailed surface morphologies of the plasma-sprayed coatings are presented, and their roles in pool boiling heat transfer mechanisms are analyzed. Plasma-coated surfaces exhibit wickability characteristics and enhanced wettability compared to the plain copper surface. Saturated pool boiling experiments are performed with DI (deionized) water at atmospheric pressure. Plasma spray-coated surfaces show favorable boiling incipience with less wall superheat and more active nucleation sites than the plain copper surface. Compared to the plain copper surface, enhancement values of nearly 68, 60.7, and 55.5% in the heat transfer coefficient are observed for C-15, C-20, and C-25 plasma-coated surfaces, respectively. Experiments could not be performed beyond the heat flux of 197 W/cm 2 due to repeated failure of the cartridge heaters. Based on the experimental measurement of wickabilities, the CHF values of plasma-coated surfaces have been theoretically calculated. Compared to the plain copper surface, a maximum 2.39 times higher CHF value is observed for C-15 plasma-coated surface. Improved wettability and wickability are responsible for CHF enhancement in the case of plasma-coated surfaces. At higher heat flux, capillary wicking and frequent rewetting of the dryout locations delay the burnout phenomenon, enhancing CHF in plasma-coated surfaces. The plasma-spray coating is a robust and scalable process, which can be a potential candidate for high heat flux dissipation in various industrial applications. ■ HIGHLIGHTS • Plasma-sprayed aluminum coatings are fabricated on the copper substrate. • Surface characteristics of plasma-coated surfaces are explored. • Plasma-coated surfaces exhibit enhanced wettability and wickability behavior. • Pool boiling heat transfer characteristics of plasmacoated surfaces are analyzed. • Plasma-coated surfaces have enhanced CHF and HTC than the plain copper surface.

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“…The introduction of MoSi 2 into ZrB 2 -MoSi 2 coatings increases the compactness of ZrB 2 and effectively reduces the oxidation consumption of ZrB 2 [23,24]. Coatings of the ZrB 2 -MoSi 2 system are obtained via electrolytic and electrophoretic deposition from solutions [25], pack cementation [17,26], slurry methods [17,[27][28][29], plasma spraying [30,31], etc. All of these methods require special preliminary surface preparation or the formation of a bonding sublayer between the coating material and the substrate [17,[25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior and Microstructural Evolution of ZrB2–35MoSi2–10Al Composite Coating

et al. 2021

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The problem of creating and implementing high-temperature coatings for the protection of carbon–carbon (C/C) composites remains relevant due to the extremely low or insufficient heat resistance of C/C composites in an oxygen-containing environment. In the present work, detonation spraying was used for preparing new ZrB2–35MoSi2–10Al coatings on the surface of C/C composites without a sublayer. As a stabilizer of high-temperature modification of zirconia, and to increase the wettability of the surface of C/C composites, 5 wt.% Y2O3 and 10 wt.% Al were added to the initial powder mixture, respectively. The structure of the as-sprayed coating presents many lamellae piled up one upon another, and is composed of hexagonal ZrB2 (h- ZrB2), tetragonal MoSi2 (t-MoSi2), monoclinic ZrO2 (m-ZrO2), tetragonal ZrO2 (t-ZrO2), monoclinic SiO2 (m-SiO2), and cubic Al phases. The oxidation behavior and microstructural evolution of the ZrB2–35MoSi2–10Al composite coating were characterized from RT to 1400 °C in open air. During oxidation at 1400 °C, a continuous layer of silicate glass was formed on the coating surface. This layer contained cubic ZrO2 (c-ZrO2), m-ZrO2, and small amounts of mullite and zircon. The results indicated that a new ZrB2–35MoSi2–10Al composite coating could be used on the surface of C/C composites as a protective layer from oxidation at elevated temperatures.

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Comparison of ZrB2-MoSi2 Composite Coatings Fabricated by Atmospheric and Vacuum Plasma Spray Processes

Cited by 29 publications

References 20 publications

Effect of Heat Treatment on the Microstructure and Phase Composition of ZrB2–MoSi2 Coating

Effect of Heat Treatment on the Microstructure and Phase Composition of ZrB2–MoSi2 Coating

Heat Transfer Characteristics of Pool Boiling with Scalable Plasma-Sprayed Aluminum Coatings

Oxidation Behavior and Microstructural Evolution of ZrB2–35MoSi2–10Al Composite Coating

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