Growth kinetics of W5Si3 layer in WSi2/W system

Lee, Kyung Hwan; Yoon, Jin Kook; Lee, Jong Kwon; Doh, Jung-Mann; Hong, Kyung Tae; Yoon, Woo Young

doi:10.1016/j.surfcoat.2004.02.039

Cited by 45 publications

(17 citation statements)

References 10 publications

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“…In addition, Raman signal mapping (Micro Raman T64000JobinYvon, λ laser = 532nm,P laser =4.3 mW) analyses were performed in order to get a composition map of each sample. For this purpose, the characteristic Raman signatures of W 5 Si 3 , showing peaks at 117, 170 and 270 cm -1 [7], and of WSi 2 , with peaks at 335 and 456 cm -1 [6,7,21], were used to identify the formed silicide phases. The electric resistance evolution of all tested filaments was monitored in order to find a relationship between the different trends observed in the corresponding R fil (t) curves and the results obtained from the SEM, EDX and Raman measurements.…”

Section: Methodsmentioning

confidence: 99%

“…In this context, some works dealing with the growth process of silicides (WSi 2 and W 5 Si 3 ) in W metal films have been published in the last years [5][6][7]. The study of silicides formation processes in W filaments has also attracted much attention from the scientific community in the context of the hot-wire chemical vapour deposition (HWCVD) of silicon (Si) related materials [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Real-time monitoring of the silicidation process of tungsten filaments at high temperature used as catalysers for silane decomposition

Nos

Frigeri

Bertomeu

2014

Materials Chemistry and Physics

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The scope of this work is the systematic study of the silicidation process affecting tungsten filaments at high temperature (1900ºC) used for silane decomposition in the hot-wire chemical vapour deposition technique (HWCVD). The correlation between the electrical resistance evolution of the filaments, R fil (t), and the different stages of the their silicidation process is exposed. Said stages correspond to: the rapid formation of two WSi 2 fronts at the cold ends of the filaments and their further propagation towards the middle of the filaments; and, regarding the hot central portion of the filaments: a initial stage of silicon dissolution into the tungsten bulk, with a random duration for asmanufactured filaments, followed by the inhomogeneous nucleation of W 5 Si 3 (which is later replaced by WSi 2 ) and its further growth towards the filaments core. An electrical model is used to obtain real-time information about the current status of the filaments silicidation process by simply monitoring their R fil (t) evolution during the HWCVD process. It is shown that implementing an annealing pre-treatment to the filaments leads to a clearly repetitive trend in the monitored R fil (t) signatures. The influence of hydrogen dilution of silane on the filaments silicidation process is also discussed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Real-time monitoring of the silicidation process of tungsten filaments at high temperature used as catalysers for silane decomposition

Nos

Frigeri

Bertomeu

2014

Materials Chemistry and Physics

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“…Adding carbides such as VC and TiC into W matrix is one of the most effective way to grain growth mechanism [4][5][6][7]. They have excellent properties such as high melting point, high modules, high resistance of thermal shock, and high temperature strength [1].…”

Section: Introductionmentioning

confidence: 99%

Assessment on Gamma Attenuation Behavior of W-VC-C and W-VC-TiC-C Composites for Co-60 Radioisotope

et al. 2017

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In this study, tungsten-vanadium carbide-graphite (W-VC-C) and tungsten-vanadium carbide-titanium carbide-graphite composite (W-VC-TiC-C) materials were investigated against Co-60 gamma radioisotope. The composite materials which are used in advanced technological studies and high temperature applications in many various fields especially in the areas of fission and fusion armor materials were produced by mechanical alloying method as in two groups. One of them include 93% tungsten (W), 6% vanadium carbide (VC) and 1% graphite (C) also which has three different alloying times (6-12-24 h). Other group of the samples was composed of 91% tungsten, 6% vanadium carbide (VC), 2% titanium carbide (TiC) and 1% graphite (C) also which has three different alloying times (6-12-24 h) and sintered at 1750• C. Co-60 gamma radioisotope source and gamma transmission technique were used in the experiments to investigate the properties of the composite materials. The mass attenuation coefficients of the samples were determined by using experimental results and theoretical mass attenuation coefficients were calculated from XCOM computer code. It can be concluded that increasing the tungsten ratio causes higher mass attenuation coefficient and the composite materials have provided us benefits better than lead for radiation gamma shielding.

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“…As dispersion strengtheners, refractory carbide, nitride and oxide phases, such as TiC, ZrC, HfC, TiN, Y 2 O 3 , La 2 O 3 , Sm 2 O 3 , ThO 2 , ZrO 2 , etc. have been mainly used to improve the mechanical properties of tungsten and its alloys [6,1,7]. However, their content in tungsten is usually less than 2 vol.% and to date [7], unfortunately, research on tungsten matrix composites reinforced with a higher content of ceramic phase has not been reported.…”

Section: Introductionmentioning

confidence: 99%

“…have been mainly used to improve the mechanical properties of tungsten and its alloys [6,1,7]. However, their content in tungsten is usually less than 2 vol.% and to date [7], unfortunately, research on tungsten matrix composites reinforced with a higher content of ceramic phase has not been reported. Furthermore, there is no literature which reports on tungsten matrix composites reinforced with SiC which is a hard and strong material with low density [8].…”

Section: Introductionmentioning

confidence: 99%

Characterization investigations during mechanical alloying and sintering of W–20 vol% SiC composites

Coşkun¹,

Öveçoğlu²,

Özkal³

et al. 2010

Journal of Alloys and Compounds

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a b s t r a c tThe effect of mechanical alloying and the sintering regime on the microstructural and the physical properties of W-SiC composites were investigated. Powder mixtures of W-20 vol.% SiC were mechanically alloyed (MA'd) using a Spex mill for 3 h, 6 h and 24 h. MA'd powders were characterized by Laser Diffraction Particle Size Analyzer, SEM and XRD investigations. MA'd W-20 vol.% SiC powder composites were sintered under inert Ar and reducing H 2 gas conditions at 1680• C and 1770• C for 1 h. The microstructural and mechanical characterizations of the sintered samples were carried out by scanning electron microscope (SEM) and X-ray diffraction (XRD) and Vickers Hardness analyses. The addition of SiC remarkably increases the hardness of the composites. Hardness is also increased with decreasing grain size and increasing amount of MA.

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Growth kinetics of W5Si3 layer in WSi2/W system

Cited by 45 publications

References 10 publications

Real-time monitoring of the silicidation process of tungsten filaments at high temperature used as catalysers for silane decomposition

Real-time monitoring of the silicidation process of tungsten filaments at high temperature used as catalysers for silane decomposition

Assessment on Gamma Attenuation Behavior of W-VC-C and W-VC-TiC-C Composites for Co-60 Radioisotope

Characterization investigations during mechanical alloying and sintering of W–20 vol% SiC composites

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