Fluidized bed chemical vapor deposition

KAERI uses the fluidized bed chemical vapor deposition (FB-CVD) technology for TRISO coating (Kim et al., 2009a). Fig. 13.15 shows the arrangement of the FB-CVD furnace with the gas supply and off-gas system. Continuous coating techniques for SiC TRISO layers have been developed, and the optimization of the coating procedure has been completed at the 20—30g/batch scale. Fig. 13.16 shows KAERTs pilot SiC TRISO-coated fuel particle. 

The multiwalled nanotubes as well as the herringbone type carbon nanofibers were synthesized in-house in a quartz glass fluidized bed reactor via chemical vapor deposition (CVD). The method is described in detail elsewhere.19 The platelet nanofibers, in contrast, were purchased from the company FutureCarbon GmbH (Bayreuth, Germany). 

The pigments are then dried and calcined at 700-900 °C. The titration (chloride) process is preferred for interference pigments with thick Ti02 layers because it is easier to control. Chemical vapor deposition in a fluidized bed has also been proposed ... 

C.C. Chen and S.W. Chen, Nickel and Copper Deposition on Al Oj and SiC Particulates by Using the Chemical Vapor Deposition Fluidized Bed Reactor Technique, Journal of Materials Science, Vol.32, 1997, pp.4429-4435. 

E. Willing, F. Holub, E. Horl, Chemical Vapor Deposition of NbjSn in a Fluidized Bed, Proc. 4th Eur. Conf. on CVD, Phillips Center for Manufacturing Technoloy, Eindhoven, The Netherlands, 1983, pp. 156-63. 

Abstract Supported ruthenium catalysts have been synthesized by organometallic chemical vapor deposition using using Ru3(CO)i2 as ruthenium precursor. The results show that the ruthenium particles are distributed uniformly on the supports in the fluidized-bed conditions. Under the static conditions, various differently loaded ruthenium catalysts were prepared by controlling the initial amount of the ruthenium precursor under high-vacuum conditions. The size of the ruthenium particles can be controlled by changing the support. The as-prepared catalysts were highly catalytically active and stable for the CO oxidation reaction. 

Coatings formed by chemical vapor deposition are produced by the pack, fluidized bed [35,36] and vapor streaming methods. Pack cementation techniques have been discussed extensively by Aves and... 

Figure 4.11.25 Energy-dispersive X-ray image of herringbone-carbon nanofibers synthesized by catalytic chemical vapor deposition in a fluidized bed reactor (Department of Chemical Engineering, University of Bayreuth) from an ethylene-nitrogen mixture ( ung, 2005).

However, it is really more complex and proceeds via the formation of benzene, various polyaromatic hydrocarbons and is finally deposited as carbon [34], Other CVD deposition techniques use a fluidized bed [35] and plasma [36], A variation of the CVD process used for the production of carbon-carbon employs a chemical vapor infiltration (CVI) technique, where the reactive medium diffuses into a porous substrate, such as a 3-D fiber construction, but any by-products formed must be allowed to diffuse outwards, rendering the process extremely slow. 

Preparation of Catalysts by Chemical Vapor-Phase Deposition and Decomposition on Support Materials in a Fluidized-Bed Reactor... 

Reactor, fluidized bed (CVD) A means of floating, stirring, and mixing parts in a heated chamber using a flow of gas containing the chemical vapor precursor. Vibratory action can also be used to aid in moving the parts. Particles can be added to the parts to keep them separated during deposition. See also Pack cementation. 

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