Application of atmospheric CVD for internal surface coating of graphite conduit by silicon carbide

Rao, P. Mohan; Jain, Uttam; Mollick, Palash Kumar; Agarwal, Ashish; Chakravartty, J.K.; Kumar, Sanjay

doi:10.1016/j.jnucmat.2014.09.049

Cited by 11 publications

(4 citation statements)

References 21 publications

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“…Graphite is an attractive material for HT application and has been widely used as structural material due to the excellent HT mechanical properties [42,43]. And SiC is being considered as a protective coating to protect the graphite from oxidation [44,45] due to its excellent and superior properties of melting point, thermal shock resistance, and chemical inertness [46]. The mechanical properties of SiC coating are the essential prerequisites for achieving its functionality.…”

Section: Materials and Experimental Processmentioning

confidence: 99%

Evaluating high temperature elastic modulus of ceramic coatings by relative method

et al. 2017

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Abstract:The accurate evaluation of the elastic modulus of ceramic coatings at high temperature (HT) is of high significance for industrial application, yet it is not easy to get the practical modulus at HT due to the difficulty of the deformation measurement and coating separation from the composite samples. This work presented a simple approach in which relative method was used twice to solve this problem indirectly. Given a single-face or double-face coated beam sample, the relative method was firstly used to determine the real mid-span deflection of the three-point bending piece at HT, and secondly to derive the analytical relation among the HT moduli of the coating, the coated and uncoated samples. Thus the HT modulus of the coatings on beam samples is determined uniquely via the measured HT moduli of the samples with and without coatings. For a ring sample (from tube with outer-side, inner-side, and double-side coating), the relative method was used firstly to determine the real compression deformation of a split ring sample at HT, secondly to derive the relationship among the slope of load-deformation curve of the coated ring, the HT modulus of the coating and substrate. Thus, the HT modulus of ceramic coatings can be evaluated by the substrate modulus and the load-deformation data of coated rings. Mathematic expressions of those calculations were derived for the beam and ring samples. CVD-SiC coatings on graphite substrate were selected as the testing samples, of which the measured modulus ranging from room temperature to 2100 ℃ demonstrated the validity and convenience of the relative method.

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Section: Materials and Experimental Processmentioning

confidence: 99%

Evaluating high temperature elastic modulus of ceramic coatings by relative method

et al. 2017

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“…5 The phase structure of the coating was determined using X-ray diffraction (XRD) with Cu Kα radiation. Diffraction patterns were recorded with the diffraction angle (2θ) ranging from 30 to 65° at a scanning rate of 0.02° s −1 .…”

Section: Characterization Of Coatingmentioning

confidence: 99%

“…However, it is difficult to prepare a uniform and continuous coating on the carbon fiber as its especial surface microstructure by traditional techniques including CVD and electro-deposition [4][5][6][7][8]. In addition, coating each fiber within a carbon fiber bundle is a problem for researchers.…”

Section: Introductionmentioning

confidence: 99%

A novel aqueous plasma electrolysis for carbon fiber

Zhang

Chen

et al. 2016

Chemical Engineering Journal

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“…However, it is difficult to prepare a uniform and continuous coating on the carbon fiber as its especial surface microstructure by traditional techniques including CVD and electro-deposition [7][8][9][10][11][12][13][14][15]. In addition, coating each fiber within a carbon fiber bundle is a problem for researchers.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Continuous Al2O3/Y2O3 Coating on Carbon Fiber by a Novel Aqueous Plasma Electrolysis

Zhang

Shen

Chen

et al. 2017

MSF

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A novel aqueous plasma electrolysis applied for depositing a uniform and continuous Al2O3/Y2O3 ceramic coating on each fiber within a carbon fiber bundle are reported in this study. All equally spaced tungsten wires generated plasma arc, where the plasma was overlapped, excluded and extruded each other, finally a cylindrical plasma arc zone was formed, promoting the full coverage of the coating on each fiber. The Al2O3/Y2O3 coating protected the carbon fiber from oxidation above 850oC. Similarly, the coating significantly improved the oxidation resistance of the carbon fiber with the mass loss of ~5% after isothermal oxidation in N2 atmosphere at 800°C for 30 min, compared to ~14% of bare carbon fiber. By the movement of the T300 carbon fiber bundle, 1500 m coated carbon fiber bundle with the high-quality Al2O3/Y2O3 coating deposited on each fiber was successfully realized. It is believed that the novel aqueous plasma electrolysis will find a wide range of applications in modifying the interface of the carbon fiber reinforced composites. The present investigation will also open up a new horizon for preparing a protective coating on each fiber within two/three-dimensional carbon fiber fabric.

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Application of atmospheric CVD for internal surface coating of graphite conduit by silicon carbide

Cited by 11 publications

References 21 publications

Evaluating high temperature elastic modulus of ceramic coatings by relative method

Evaluating high temperature elastic modulus of ceramic coatings by relative method

A novel aqueous plasma electrolysis for carbon fiber

Preparation of Continuous Al<sub>2</sub>O<sub>3</sub>/Y<sub>2</sub>O<sub>3</sub> Coating on Carbon Fiber by a Novel Aqueous Plasma Electrolysis

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