Calculation and synthesis of ZrC by CVD from ZrCl4–C3H6–H2–Ar system with high H2 percentage

Zhu, Yanchao; Cheng, Laifei; Ma, Baisheng; Gao, Shuang; Feng, Wei; Liu, Yongsheng; Zhang, Litong

doi:10.1016/j.apsusc.2015.01.175

Cited by 23 publications

(9 citation statements)

References 22 publications

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“…The effect of reactor total pressure on the growth and structure of ZrC layers has also been reported by Zhu et al [17]. However, to our knowledge, no study has been reported on the effect of ZrCl 4 partial pressure on the growth and structure of ZrC grown by thermal CVD.…”

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confidence: 66%

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The role of ZrCl4 partial pressure on the growth characteristics of chemical vapour deposited ZrC layers

Biira

Crouse

Hlatshwayo

et al. 2017

Ceramics International

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ZrC layers were deposited in a chemical vapour deposition (CVD) reactor on graphite substrates using a ZrCl 4-ArCH 4-H 2 precursor mixture. The deposition was conducted at different ZrCl 4 partial pressures at a constant substrate temperature of 1400 °C for 2 h at atmospheric pressure. The deposited ZrC layers were characterised using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The effect of ZrCl 4 partial pressure on the growth rate, microstructure and surface morphology of the deposited layers was studied. The ZrCl 4 partial pressure was manipulated by changing the flow rate of the argon carrier gas through the sublimation chamber. The boundary layer thickness decreased as ZrCl 4 partial pressures increased due increased argon flows. The increased ZrCl 4 partial pressure increased the growth rate of ZrC layers linearly. It was found that the transport process of the source materials was laminar and forced convection flow. The flow process of source materials through the boundary layer to the reacting surface was also 2 illustrated using a model. The average crystallite size increased with ZrCl 4 partial pressures, whereas the lattice parameter, lattice strain and dislocation density decreased as ZrCl 4 partial pressure increased. The surface morphology of the as-deposited ZrC layers varied with the ZrCl 4 partial pressure. The size of crystals grew larger and the cavities surrounding them decreased in number and size as the ZrCl 4 partial pressure increased.

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confidence: 66%

“…The influence of substrate-inlet gap on the growth characteristics of ZrC layers has been reported in [13]. Several researchers have studied the effect of the carbon source (especially CH 4 and C 3 H 6 ) [14,17,18] and hydrogen flow rates [17,19] on the properties of ZrC layers.…”

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confidence: 99%

The role of ZrCl4 partial pressure on the growth characteristics of chemical vapour deposited ZrC layers

Biira

Crouse

Hlatshwayo

et al. 2017

Ceramics International

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“…The layer is composed of ZrC (COD 96-900-8778) and amorphous carbon. In the comparison with the research done by Yan Zhu et al [12] , ZrC will start to be formed at the temperature of 750 K (500 o C). 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.…”

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] . Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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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“…These exceptional properties, which include ultra-high melting point (3540 °C), good resistance to high-speed gas or particle erosion and good ablation resistance 2 , make ZrC suitable for many applications, such as cutting tools, wear resistant components, field emitters, thermophotovoltaic radiators and diffusion barrier coatings on nuclear particle fuels for the nuclear industry 3 . On the other hand, silicon carbide (SiC) is a ceramic already widely used, particularly as an abrasive and in composites used for high-temperature structural applications 4 , with potential applications in field emitters, FETs, NEMS devices, catalysts and microwave absorbers 5 .…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted Synthesis of a ZrC-SiC Nanocomposite by Carbothermal Reduction and its Effect on Mean Particle Size

Gaviría

Kiminami

2016

Mat. Res.

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ZrC-SiC nanopowders were prepared by carbothermal reduction of ZrO 2 and SiO 2 with carbon black in argon gas atmosphere, using microwave energy as an alternative heating source. The samples were characterized by XRD, SEM and BET surface area analysis. The results indicate that highly crystalline ZrC-SiC composites with a mean particle size of about 80 nm can be synthesized at a relatively low temperature (~1420 °C). Microwave-assisted heating to obtain the ZrC-SiC nanopowders significantly reduces the synthesis time to only 40 min when compared with the long reaction times involved in conventional carbothermal reduction, which requires about 8 hours to obtain ZrC and 2 hours to obtain SiC.

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Calculation and synthesis of ZrC by CVD from ZrCl4–C3H6–H2–Ar system with high H2 percentage

Cited by 23 publications

References 22 publications

The role of ZrCl4 partial pressure on the growth characteristics of chemical vapour deposited ZrC layers

The role of ZrCl4 partial pressure on the growth characteristics of chemical vapour deposited ZrC layers

ZrC COATING ON FUEL ELEMENT CLADDING ZIRCALOY-2

Microwave-assisted Synthesis of a ZrC-SiC Nanocomposite by Carbothermal Reduction and its Effect on Mean Particle Size

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