Role of impurities on the spark plasma sintering of ZrCx–ZrB2 composites

Goutier, Fabrice; Trolliard, Gilles; Valette, Stéphane; Maı̂tre, Alexandre; Estournès, Claude

doi:10.1016/j.jeurceramsoc.2007.07.013

Cited by 34 publications

(24 citation statements)

References 14 publications

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“…In the case of electrically conductive materials, the heating-up is then mainly due to the Joule effect. Compared to hot-pressing, the SPS technique allows sintering at lower temperatures and shorter soaking times, even for high refractory ceramics such as zirconium carbide-based materials [22]. The oxycarbide powders were placed into a graphite matrix for SPS treatments.…”

Section: Shaping Of Pellet-type Bulk Materials and Comparison With Pomentioning

confidence: 99%

Novel insight into the chemical analysis of light elements in oxycarbides

et al. 2018

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Pure powders of TiCxO(1-x) solid solution were synthesized through the carbothermal route. The chemical analysis of the light elements in the as-obtained TiCxO(1-x) oxycarbides powders were performed by Instrumented Gas Analysis (IGA). The cell parameters of the samples were determined with an accuracy of about 2% by means of X-ray powder diffraction and the internal standard method. As a result, a model correlating the cell parameters to the chemical composition was established. These reference TiCxO(1-x) oxycarbides powders were then sintered in order to obtain pellets of dense ceramics. After having determined that the sintering process does not change the chemical composition of the starting powder, chemical analysis of the different samples of the solid solution were successfully undertaken by Ion Beam Analysis techniques (IBA). The Nuclear Reaction Analysis (NRA) method -that was used to analyse light elements with very high sensitivity -was coupled with Rutherford Back Scattering (RBS) analysis in order to accurately determine the metallic over light elements ratio and to determine the stoichiometry of the phase on massive samples. Exhaustive simulations of the NRA spectra were performed and demonstrated that discrete compositions of the TiCxO(1-x) can be efficiently measured locally for bulk samples. Compared to IGA results, the relative amounts of carbon and oxygen of bulk materials were determined with a bias lower than 5%. This protocol being implemented for the TiCxO(1-x) system was then tested on HfCxO(1-x)with the same success.3

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Section: Shaping Of Pellet-type Bulk Materials and Comparison With Pomentioning

confidence: 99%

Novel insight into the chemical analysis of light elements in oxycarbides

et al. 2018

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“…Compared to hot-pressing, the SPS technique allows sintering at lower temperatures and shorter soaking times, even for highly refractory ceramics such as zirconium-carbide-based materials [7,8]. For SPS, the raw powders are firstly put in a graphite die before being uniaxially pressed while a DC pulse voltage is applied to the compact.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, this way of synthesis was developed to avoid the presence in the starting powders of impurities, e.g. free carbon or silica, which are usually detected in commercial zirconium carbide powders [8]. Secondly, investigations were undertaken to formulate hypotheses about the mechanisms controlling the densification of such ZrC x O y oxycarbide powders during the SPS treatment.…”

Section: Introductionmentioning

confidence: 99%

A study of the densification mechanisms during spark plasma sintering of zirconium (oxy-)carbide powders

2010

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“…It has been reported that carbon promotes removal of surface oxides in ZrB 2 powders and limits grain growth, thus enhancing its sinterability [11][12][13][14] . The beneficial role of carbon in the formation of ZrB 2 -based compounds, however, is not fully understood and few studies have been conducted at the nano-to atomistic scales 13 .…”

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Kinetic Role of Carbon in Solid-State Synthesis of Zirconium Diboride using Nanolaminates: Nanocalorimetry Experiments and First-Principles Calculations

et al. 2015

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Reactive nano-laminates afford a promising route for the low-temperature synthesis of zirconium diboride, an ultrahigh-temperature ceramic with metallic properties. Although the addition of carbon is known to facilitate sintering of ZrB 2 , its effect on the kinetics of the formation reaction has not been elucidated. We have employed a combined approach of nanocalorimetry and first-principles theoretical studies to investigate the kinetic role of carbon in the synthesis of ZrB 2 using B 4 C/Zr reactive nano-laminates. Structural characterization of the laminates by XRD and TEM reveal that the reaction proceeds via inter-diffusion of the B 4 C and Zr layers, which produces an amorphous Zr 3 B 4 C alloy. This amorphous alloy then crystallizes to form a super-saturated ZrB 2 (C) compound. A kinetic analysis shows that carbon lowers the energy barriers for both inter-diffusion and crystallization by more than 20%. Energetic calculations based on first-principles modeling suggest that the reduction of the diffusion barrier may be attributed to the stronger bonding between Zr and C as compared to the bonding between Zr and B.

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Role of impurities on the spark plasma sintering of ZrCx–ZrB2 composites

Cited by 34 publications

References 14 publications

Novel insight into the chemical analysis of light elements in oxycarbides

Novel insight into the chemical analysis of light elements in oxycarbides

A study of the densification mechanisms during spark plasma sintering of zirconium (oxy-)carbide powders

Kinetic Role of Carbon in Solid-State Synthesis of Zirconium Diboride using Nanolaminates: Nanocalorimetry Experiments and First-Principles Calculations

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