Ablation mechanism of ZrB2-SiC coating for SiC-coated graphite under an oxyacetylene flame

Aliasgarian, Reza; Naderi, M.; Mirsalehi, Seyyed Ehsan

doi:10.1016/j.surfcoat.2018.07.031

Cited by 28 publications

(6 citation statements)

References 27 publications

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“…These cracks act as the channels for oxygen penetration, which result in the oxidation of the SiC inner layer and formation of SiO 2 phase under the surface layer (Figure 15(e,f)). Thus, according to Figure 15, the observation of ZrC and SiC phases under the surface layer confirm the demonstrative effect of ZrO 2 layer as a protective and barrier layer against further oxidation during the ablation test [23,28,30].…”

Section: Ablation Test Resultssupporting

confidence: 72%

Ablation behaviour of ZrC coating by novel solid shielding/shrouded plasma spray

Eshaghi

Valefi

Ehsani

2021

Surface Engineering

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In this study, for the first time, ZrC coating was deposited on SiC coated graphite by optimized atmospheric plasma spray (i.e. solid shielding shrouded plasma spray (SSPS)) method. Then SSPS-ZrC coatings were compared with the atmospheric plasma spray APS-ZrC coatings. The results indicated that the the SSPS-ZrC coated sample had lower porosity compared with APS-ZrC coating (3% and 7.5% respectively) and the ablation test revealed that the linear and mass ablation rates of the ZrC coating applied by APS method were 3.7×10 −3 mm.s −1 and 22×10 −3 g.s −1 , while those for SSPS coating were 2.2×10 −3 mm.s −1 and 14×10 −3 g.s −1 , respectively. The results showed that applying the ZrC coating with the SSPS method can improve the ablation resistance of the equipment used in harsh conditions, significantly. It is attributed to the formation of a continuous zirconia (ZrO 2 ) layer on the surface during the ablation test of the ZrC coating.

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Section: Ablation Test Resultssupporting

confidence: 72%

Ablation behaviour of ZrC coating by novel solid shielding/shrouded plasma spray

Eshaghi

Valefi

Ehsani

2021

Surface Engineering

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“…The results showed that the principal phase in an oxide scale was monoclinic ZrO 2 , while tetragonal zirconia was not found in the torch setting for the samples oxidized at 800 °C. Tetragonal zirconia may be able to form during oxidation but can also be transformed during cooling into monoclinic zirconia [ 14 , 27 ]. In the sample oxidized at 1000 °C and 1200 °C, some traces of zircon (ZrSiO 4 ) were detected.…”

Section: Resultsmentioning

confidence: 99%

“…The XRD spectra obtained from the oxide scales formed during isothermal exposure at 1000 • C and 1200 • C (torch compared to the furnace test) are shown in Figure 10a,b and Figure 11a,b respectively. The results showed that the principal phase in an oxide scale was monoclinic ZrO 2 , while tetragonal zirconia was not found in the torch setting for the samples oxidized at 800 • C. Tetragonal zirconia may be able to form during oxidation but can also be transformed during cooling into monoclinic zirconia [14,27]. In the sample oxidized at 1000 • C and 1200 • C, some traces of zircon (ZrSiO 4 ) were detected.…”

Section: Oxidation Behaviormentioning

confidence: 94%

“…A thermal barrier coating (TBC) is a state-of-the-art ceramic materials device that is deposited on top of a substrate such as metal and carbon fibers to boost their thermal isolation characteristics and achieve greater performance by increasing the accepted operating temperatures; TBCs can also be used in many applications, such as combustion engines (internal burners and gas turbines) [ 14 , 15 ]. TBCs are a practical approach to eliminate the unburned emissions of hydrocarbons resulting from incomplete combustion.…”

Section: Introductionmentioning

confidence: 99%

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The Oxidation Behavior of ZrB2-SiC Ceramic Composites Fabricated by Plasma Spray Process

2021

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Our goal is to develop a structural ceramic for high-temperature applications in which silicon carbide-based materials (SiCs) are used as matrix composites. The potential of SiCs to deposit a mixture of SiC and zirconium diboride (ZrB2) plasma spray coating is analyzed. To deposit thermal barrier layers containing up to 50 vol.% SiC, a high-pressure plasma spray (HPPS) process was used. Although the SiC cannot be deposited by thermal spray, a mixture of SiC and zirconium diboride (ZrB2) was deposited because these two compounds form a eutectic phase at a temperature below SiC decomposition. The preference was two different forms, 3 mm and 1 mm, of graphite substrates with different thickness values. A comparison of the morphology of SiC-ZrB2 coatings before and after thermal treatment was performed by applying heat to the surface of a gas torch and traditional furnace between 800 °C and 1200 °C. The growth of the oxide scale was calculated with X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), and density. The oxide scale consists of a SiO2 layer with ZrO2 groups. The findings indicate a greater potential for the studied material in protecting against high-temperature oxidation and in a wide variety of aerospace applications.

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“…This glass layer efficiently retards the diffusion of oxygen [ 10 , 11 ]. One of the most widely used high-temperature coatings is ZrB 2 -SiC [ 12 , 13 , 14 ], which demonstrates high protective properties and oxidation resistance up to 1500 °C. Over the last five years, there has been a considerable increase of interest toward ZrB 2 -MoSi 2 coatings for the protection of carbon–carbon (C/C) and carbon–ceramic (C/SiC) composites from oxidation [ 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of Zr-Mo-Si-B-(N) Hard Coatings Obtained by d.c. Magnetron Sputtering of ZrB2-MoSi2 Target

Kiryukhantsev-Korneev

Сытченко

Pogozhev

et al. 2021

Materials

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Coatings in a Zr-Mo-Si-B-N system were deposited by the magnetron sputtering of ZrB2-MoSi2 targets in argon and nitrogen. The structure of the coatings was investigated using scanning electron microscopy, X-ray diffraction, energy-dispersive spectroscopy, and glow-discharge optical emission spectroscopy. Mechanical and tribological properties were measured using nanoindentation and pin-on-disc testing. Oxidation resistance and oxidation kinetics were estimated via annealing in air at 1000–1500 °C and precision weight measurements. We found that the coatings deposited in Ar demonstrate a superior combination of properties, including hardness of 36 GPa, elastic recovery of 84%, a friction coefficient of 0.6, and oxidation resistance at temperatures up to 1200 °C. High oxidation resistance is realized due to the formation of the protective (SiO2 + ZrO2)/SiO2 oxide layer, which inhibits the diffusion of oxygen into the coating.

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Ablation mechanism of ZrB2-SiC coating for SiC-coated graphite under an oxyacetylene flame

Cited by 28 publications

References 27 publications

Ablation behaviour of ZrC coating by novel solid shielding/shrouded plasma spray

Ablation behaviour of ZrC coating by novel solid shielding/shrouded plasma spray

The Oxidation Behavior of ZrB2-SiC Ceramic Composites Fabricated by Plasma Spray Process

Structure and Properties of Zr-Mo-Si-B-(N) Hard Coatings Obtained by d.c. Magnetron Sputtering of ZrB2-MoSi2 Target

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