Principles and applications of CVD powder technology

Vahlas, Constantin; Caussat, Brigitte; Serp, Philippe; Angelopoulos, G.N.

doi:10.1016/j.mser.2006.05.001

Cited by 167 publications

(103 citation statements)

References 177 publications

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“…To deposit coatings on particles, it is difficult to ensure an effective contact between the gaseous phase and growing surface when using the CVD process. 5) Fluidized-bed CVD (FBCVD) is a robust CVD technique to treat powder substrates. There are a number of open literature publications on fabrication of catalytic nanoparticles of Pt, Pd and Rh deposited on powder supports of oxides such as Al 2 O 3 , TiO 2 and SiO 2 by FBCVD.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Vahlas et al suggested that sintered compacts, comprising WC-coated Al 2 O 3 obtained using FBCVD and Co as a binder, were promising materials with effective combinations possessing toughness, hardness and wear resistance. 5) Deposition of Ni and Cu layers on ceramic reinforcing particles, such as Al 2 O 3 and SiC, improved the wettability in metal matrix composites.…”

Section: Introductionmentioning

confidence: 99%

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Coatings on ceramic powders by rotary chemical vapor deposition and sintering of the coated powders

Katsui

Goto

2018

J. Ceram. Soc. Japan

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Rotary chemical vapor deposition (CVD) is a non-line-of-sight-deposition process with excellent coverage and a versatile technique to modify surfaces of ceramic powders. In this paper, potential applications of rotary CVD for coatings on powders are presented; highly dispersive catalytic nanoparticles can be deposited on support powders, while the conformal thin layers can be coated uniformly on particulates, which are advantageous in powder metallurgy for the preparation of sintered bulk materials. Particularly, this paper focuses on the deposition of silicon carbide (SiC) layers on silica (SiO 2 ) and diamond particles using the rotary CVD technique; the resultant core/shell powders are readily sintered using spark plasma sintering at moderate temperatures and pressures. The CVD-SiC layers formed on powders prevent grain growth and act as protective layers against reactions and phase transformations at the sintering temperatures, resulting in the formation of a discriminating microstructure with enhanced mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coatings on ceramic powders by rotary chemical vapor deposition and sintering of the coated powders

Katsui

Goto

2018

J. Ceram. Soc. Japan

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“…materials. In contrast to conventional multi-step wet chemistry techniques, the MOCVD method (metal-organic chemical vapor deposition) (Serp et al, 1999;Vahlas, Juares, Feurer, Serp & Caussat, 2002;Aksoylu et al, 2003;Vahlas, Caussat, Serp & Angelopoulos, 2006) and flame technology (Strobel, 2009;Choi, Lee H, Shim & Lee D., 2010;Sudong Yang et al, 2014) allow preparation of supported of metal nanoparticles of platinum group metals onto nanocarbon supports in a single step. МОСVD methods and traditional flame synthesis rely on volatile metal precursors.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Detonation Nanodiamonds with Platinum and Palladium Nanoparticles

Isakova

Isakov²,

Lyamkin³

et al. 2014

IJC

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Acetylacetonates of platinum group metals (М(асас) n , асас= СН 3 СОСНСОСН 3 , n -oxidation state of metal) are the most suitable precursors for use in highly effective MOCVD (metal-organic chemical vapor deposition) processes because of their thermal properties, low price of initial ligand and accessible synthesis methods. In this study we have developed a simple, scalable inexpensive, MOCVD-like approach to the deposition of Pt and Pd nanoparticle dispersions on powder detonation nanodiamonds (DND) using combustion in air of powder mixtures of DND with Pt and Pd acetylacetonates. This one-step process requires no specialized apparatus, and is conducted at mild temperatures (180 o C -250 o C). The substrate surface of DND initiates chemical thermal destruction of precursor and deposition of nanoparticle networks composed of constituent particles. DND-supported Pd and Pt nanoparticles with their loading being from 10 and 5wt. % were obtained the average of particle size 20-25 nm and 7-10nm decreases with decreasing the metal loading. For additional purification and disaggregation of the commercial detonation-synthesized nanodiamond (DND comm ) the method of annealing of the powder mixtures DND comm with Na(acac) have been used. The purified diamond nanoparticulates (DND), as well as DND comm , Pt/DND and Pd/DND, were subjected to physicochemical characterizations, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analysis.

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“…Vahlas et al [11] applied chemical vapor deposition (CVD) for preparing niobium powder. Fray et al [12][13][14][15][16][17][18] used molten CaCl 2 to develop the "Fray, Farthing, and Chen" (FFC) Cambridge process.…”

Section: Introductionmentioning

confidence: 99%