The effect of temperature on the growth and properties of chemical vapor deposited ZrC films on SiC-coated graphite substrates

Kim, Jun Gyu; Park, Si Jung; Park, Ji Yeon; Choi, Doo Jin

doi:10.1016/j.ceramint.2014.08.060

Cited by 18 publications

(9 citation statements)

References 21 publications

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“…Due to its high melting point, high hardness/modulus and good oxidation/ablation performances, ZrC is a promising material used in high temperature extreme environment. The synthesis methods of ZrCNWs mainly include chemical vapor decomposition (CVD), 22 precursor infiltration and pyrolysis (PIP), 23 carbothermal reduction, 18 microwave hydrothermal processing 24 . ZrCNWs synthesized by these methods are mainly hampered by the following aspects.…”

Section: Introductionmentioning

confidence: 99%

Catalyst‐free in situ synthesis of ZrC nanowires with excellent thermal stability

Yan

et al. 2020

J Am Ceram Soc

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No catalyst‐assisted zirconium carbide nanowires (ZrCNWs) were successfully synthesized by thermal evaporation and in situ reaction using carbon nanotubes (CNTs) and ZrCl4 as carbon and zirconium sources. Vapor‐Solid (VS) mechanism was proposed to explain the growth process of ZrCNWs. The ZrCNWs prepared at 1400°C have a single crystal structure with the diameters of 130‐290 nm. The axial growth direction of ZrCNWs is [111] and the yield is 76.5 wt%. After heat treatment at 1700°C, 2100°C, and 2450°C, the diameter of ZrCNWs increased and their aspect ratio decreased. By simulating the thermal stress of a single ZrCNW, it is speculated that the coarsening and fracture of ZrCNWs are caused by the overall slip of the atomic layers and the stress concentration at the dislocations.

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Section: Introductionmentioning

confidence: 99%

Catalyst‐free in situ synthesis of ZrC nanowires with excellent thermal stability

Yan

et al. 2020

J Am Ceram Soc

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“…Below 1100 o C, it seems that the carbon atoms in the coating layer gains insufficient energy to diffuse into zircaloy surface for the formation of carbide phase. By CVD process, on the other hand, ZrC phase is obtained at the temperatures in the range of 1000 o C to 1300 o C [9][10] .…”

Section: Resultsmentioning

confidence: 99%

“…It is used in some hi-tech areas such as coating layer of High Temperature Gas-cooled Reactor (HTGR) nuclear fuel [9][10] , used in aerospace industry and coating of fire line shell in all the longrange missiles [10] . Based on ZrC phase diagram in Figure 1 and yield of ZrC deposition in Figure 2 show that ZrC film will be formed at temperature ranging of 500 o C to 3500 o C [11][12] .…”

Section: Introductionmentioning

confidence: 99%

“…Carbide film in general and zirconium carbide film in particular have preeminent properties such as chemical resistance, heat conductivity, good thermal shock resistance, and high melting point (3450 o C) [9][10] . It is used in some hi-tech areas such as coating layer of High Temperature Gas-cooled Reactor (HTGR) nuclear fuel [9][10] , used in aerospace industry and coating of fire line shell in all the longrange missiles [10] .…”

Section: Introductionmentioning

confidence: 99%

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ZrC COATING ON FUEL ELEMENT CLADDING ZIRCALOY-2

Mutiara

Rachmawati²

2017

urania

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DIP-COATING PROCESS OF ZIRCALOY-2 FUEL CLADDING WITH COLLOIDAL GRAPHITE.The intensive researchs on high discharge burn-up of Light Water Reactor (LWR) fuel element have been continously performed due to the extension of fuel element's utility life. One of these researches was allowing for alteration of the existing zirconium-based clad system through coating. A coating technique with the coating layer thickness of 10 -30 µm will improve the corrosion resistance of cladding without changing the dimension of cladding. The scope of this current research is to obtain the zircaloy-2 cladding coated with ZrC layer by dipping process of zircaloy-2 specimens in colloidal graphite at room temperature. The dip-coated specimens undergo heating process at 700 o C, 900 o C and 1100 o C respectively in Argon gas atmosphere for 1 hour and are subsequently characterized by optical microscope and XRD. The optical microscope images show that the coating layers thickness are increased as the heating temperature increased. The coating layers thickness are 10 μm, 20 -40 μm and 100 μm for the specimens heated at 700 o C, 900 o C and 1100 o C respectively. The calculated diffusivity of carbon into zircaloy-2 cladding for the coated specimens at 700 o C, 900 o C and 1100 o C are 3,10216E-11 cm 2 s -1 ; 3,60479E-11 cm 2 s -1 and 4,00613E-11 cm 2 s -1 respectively. From XRD examination analysis reveals that the ZrC phase appears in the specimens heated at 1100 o C but it is not the case for specimens heated at both 700 o C and 900 o C. The coating layer of specimens heated at both 700 o C and 900 o C mostly consists of carbon. At these heating temperatures, carbon atoms have diffused into zircaloy-2 and substituted the zirconium atoms with a limited occupation to form C-Zr solid solution. At the temperature of 1100 o C, due to the increase in vibration energy, the carbon atoms have enough energy to diffuse to form the carbide phase. Heating process at higher than 700 o C, however, will degrade the zircaloy-2 cladding.. It is concluded that the dip-coating process of zircaloy-2 cladding in graphite colloid with subsequent high temperature heating is not the proper method to gain the ZrC-coated zircaloy-2 cladding. Therefore, as for the future works of this research, the others method should be searched and investigated to obtain the proper ZrC coating process on LWR zircaloy cladding which fulfills the dimension and quality requirements.

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“…Popular precursors for the CVD growth of ZrC are ZrCl 4 and CH 4 in the presence of hydrogen and argon, also used in this study. During the CVD growth of ZrC, there are often inclusions of free carbon [3–5] in the form of turbostratic carbon, i.e. highly disordered graphite [6].…”

Section: Introductionmentioning

confidence: 99%

Graphite phases in chemical vapour deposited grown ZrC/graphite layers

Pretorius

Malherbe

2021

Proc. R. Soc. A.

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The graphitic phases detected in chemical vapour deposited (CVD) ZrC layers were characterized by glancing angle X-ray diffraction. The layers were deposited at different temperatures ranging from 1250 to 1450°C in steps of 50°C. The precursors used were ZrCl 4 and CH 4 in the presence of hydrogen and argon. A total of seven graphitic phases were detected, five of which have been reported in the literature. However, two new hexagonal graphitic phases, P-6m2 (187) and P-62c (190), were also detected. It is proposed that the appearance of these two (new) phases was due to the influence of impurities in the growth region on the growth kinetics. A comprehensive phase identification process was followed to index all observed diffraction lines, followed by Rietveld analysis, to report on phase composition and crystalline properties. A distinct increase in overall graphite phase composition is observed at the higher CVD temperatures, which confirms the impact from graphitization.

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The effect of temperature on the growth and properties of chemical vapor deposited ZrC films on SiC-coated graphite substrates

Cited by 18 publications

References 21 publications

Catalyst‐free in situ synthesis of ZrC nanowires with excellent thermal stability

Catalyst‐free in situ synthesis of ZrC nanowires with excellent thermal stability

ZrC COATING ON FUEL ELEMENT CLADDING ZIRCALOY-2

Graphite phases in chemical vapour deposited grown ZrC/graphite layers

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