Thermal conductivity and microstructure of Ti-doped graphite

Qiu, Hong-zhi; Song, Young-Chae; Liü, Lang; Zhai, Gengtai; Shi, Jingli

doi:10.1016/s0008-6223(02)00429-3

Cited by 66 publications

(31 citation statements)

References 9 publications

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“…Additionaly, the Si formed by the decomposition of SiC may react with disordered carbon, and the C precipitated by the decomposition of this carbide has a high graphitization degree [10], contributing to increase the thermal conductivity, as demonstrates the high thermal conductivity achieved (195 W/mK at room temperature) compared to AT-175, Fig. 2.…”

Section: Resultsmentioning

confidence: 97%

“…As main dopant TiC (APS 130 nm) has been selected because it leads to a considerable reduction of chemical erosion by hydrogen bombardment [3,5], and it contributes to a significant increase in thermal conductivity and improvement of mechanical strength due to the catalytic effect of this carbide on the graphitization [6,7]. Some samples were additionally doped with α-SiC, (APS 20 nm) to obtain a further improvement of the thermal conductivity due to the high graphitization degree of the carbon precipitated by the decomposition of SiC [10].…”

Section: Materials Manufacturingmentioning

confidence: 99%

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Improvement of thermal shock resistance of isotropic graphite by Ti-doping

Lopez‐Galilea¹,

Ordás²,

Garcı́a-Rosales³

et al. 2009

Journal of Nuclear Materials

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Ti-doped isotropic graphite is a promising candidate material for the strike point area of the ITER divertor due to its reduced chemical erosion by hydrogen bombardment and its high thermal shock resistance, mainly due the catalytic effect of TiC on the graphitization leading to an increase of thermal conductivity and to higher mechanical strength. Several manufacturing parameters such as oxidative stabilization treatment, carbonization cycle, graphitization temperature and dwell time during graphitization have been investigated in order to establish a relationship between these parameters and the final properties.

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Section: Resultsmentioning

confidence: 97%

Section: Materials Manufacturingmentioning

confidence: 99%

Improvement of thermal shock resistance of isotropic graphite by Ti-doping

Lopez‐Galilea¹,

Ordás²,

Garcı́a-Rosales³

et al. 2009

Journal of Nuclear Materials

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show abstract

“…December 2007, Nice, France graphitic material with ~4 at.% Ti. Several samples were also produced containing, in addition to TiC, also a small amount of SiC (∼0.5 at.% Si), with the aim to further increase the thermal conductivity, taking advantage of the high graphitization degree of the carbon precipitated by the decomposition of SiC (2540°C [11]), as reported in [12]. The average particle size of the initial SiC powder was 20 nm.…”

Section: Methodsmentioning

confidence: 99%

Ti-doped isotropic graphite: A promising armour material for plasma-facing components

Garcı́a-Rosales

Lopez‐Galilea

Ordás

et al. 2009

Journal of Nuclear Materials

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Finely dispersed Ti-doped isotropic graphites with 4 at% Ti have been manufactured using synthetic mesophase pitch "AR" as raw material. These new materials show a thermal conductivity at room temperature of ∼200 W/mK and flexural strength close to 100 MPa. Measurement of the total erosion yield by deuterium bombardment at ion energies and sample temperatures for which pure carbon shows maximum values, resulted in a reduction of at least a factor of 4, mainly due to dopant enrichment at the surface caused by preferential erosion of carbon. In addition, ITER relevant thermal shock loads were applied with an energetic electron beam at the JUDITH facility. The results demonstrated a significant improved performance of Ti-doped graphite compared to pure graphite. Finally, Ti-doped graphite was successfully brazed to a CuCrZr block using a Mo interlayer. These results let assume that Ti-doped graphite can be a promising armour material for divertor plasma-facing components.

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“…Even in composites a very small amount of CNTs can induce significant changes in the material's properties. At present much work continues on the development of CNTs reinforced polymer, ceramic and metal matrix composites (Peigney et al 2000;Ning et al 2003;Qiu et al 2003). However, very little work is carried out on carbon-reinforced carbon composites (Gao et al 2005;Song et al 2007;Song et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Strengthening of semicoke based carbon composites through multi-wall carbon nanotubes

2013

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The present investigation explored the possibility of developing carbon composites using semicoke as matrix precursor and multi-walled carbon nanotubes (MWCNTs) as reinforcement. The different weight fraction of MWCNTs was incorporated in semicoke-based composites, and these composites were heat treated at 1,000, 1,400 and 2,500°C. The MWCNTs carbon composite was characterized for electrical, thermal and mechanical properties. It was observed that the bulk density of composites with 1 wt% of MWCNTs was 1.92 g/cc, whereas without nanotubes it was 1.87 g/cc. The bending strength of carbonized composites was increased by 78 % and that of graphitized ones by 69 % at 1 wt% of MWCNTs. This value of bending strength was three times higher than that of conventional graphite. The electrical and thermal conductivity increased by 12 and 33 %, respectively. The Raman spectroscopic studies showed that intensity ratio of D and G band (ID)/(IG) ratio minimum deflects the lower level of defects and higher degree of graphitization in carbon composites at 1 wt% of MWCNTs. This demonstrates that in case of MWCNTs, semicoke-based carbon composites with 1 wt% of MWCNTs were sufficient for strengthening carbon composites, if MWCNTs were well dispersed in semicoke.

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Thermal conductivity and microstructure of Ti-doped graphite

Cited by 66 publications

References 9 publications

Improvement of thermal shock resistance of isotropic graphite by Ti-doping

Improvement of thermal shock resistance of isotropic graphite by Ti-doping

Ti-doped isotropic graphite: A promising armour material for plasma-facing components

Strengthening of semicoke based carbon composites through multi-wall carbon nanotubes

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