Syntheses and crystal structures of Si-bearing layered carbides ZrAl8C7 and ZrAl4C4

Iwata, Tatsuya; Hattori, Eizou; Sugiura, Keita; Hashimoto, Shinobu; Nakano, Hiromi; Fukuda, Koichiro

doi:10.2109/jcersj2.117.37

Cited by 6 publications

(6 citation statements)

References 14 publications

(5 reference statements)

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“…Qualitative compositional analyses suggested a Si content of as high as ~1.7 at.% (x=0.102 assuming that the Al + Si content is 1/6), in agreement with the maximum solubility of Si in the targeted Zr 3 (Al 1–x Si x )C 2 phase as suggested by lattice parameters calculated from XRD results in Table . It is also noteworthy that the previously reported Si solubility in other Zr‐Al‐C‐based ternary laminar carbides at a similar level: for example, maximum solubilities of (ZrC) m [Al 1–z Si z ] 8 C 6 and (ZrC) m [Al 1–z Si z ] 4 C 3 are 0.07 and 0.11, respectively . In addition, no Si was detected in all Zr 3 AlC 2 grains studied in the composition without Si, which confirms that Si is not a major impurity in the ZrH 2 , Al or C powders (Table ).…”

Section: Resultsmentioning

confidence: 99%

Experimental synthesis and density functional theory investigation of radiation tolerance of Zr₃(Al_1‐_xSi_x)C₂MAX phases

Zapata-Solvas

Christopoulos

et al. 2017

J Am Ceram Soc

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Synthesis, characterization and density functional theory calculations have been combined to examine the formation of the Zr 3 (Al 1-x Si x )C 2 quaternary MAX phases and the intrinsic defect processes in Zr 3 AlC 2 and Zr 3 SiC 2 . The MAX phase family is extended by demonstrating that Zr 3 (Al 1-x Si x )C 2 , and particularly compositions with x%0.1, can be formed leading here to a yield of 59 wt%. It has been found that Zr 3 AlC 2 -and by extension Zr 3 (Al 1-x Si x )C 2 -formation rates benefit from the presence of traces of Si in the reactant mix, presumably through the in situ formation of Zr y Si z phase(s) acting as a nucleation substrate for the MAX phase. To investigate the radiation tolerance of Zr 3 (Al 1-x Si x )C 2 , we have also considered the intrinsic defect properties of the end-members. properties (high elastic stiffness, high melting temperature, high thermal shock resistance, good machinability, high thermal, and electrical conductivity). 2,6-12 Such properties drive their technological importance and are attributed to their structure, which consists of the stacking of n "ceramic" layer(s) interleaved by an A "metallic" layer. 2,[6][7][8] MAX phases crystallize with the hexagonal P6 3 /mmc space group (no. 194).1,2 The MAX phase family has three main forms, first M 2 AX (i.e., n=1) type which are commonly --

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Section: Resultsmentioning

confidence: 99%

Experimental synthesis and density functional theory investigation of radiation tolerance of Zr₃(Al_1‐_xSi_x)C₂MAX phases

Zapata-Solvas

Christopoulos

et al. 2017

J Am Ceram Soc

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“…Iwata et al used XRD technology to characterize ZrAl 4 C 4 and ZrAl 8 C 7 for the first time in 2008. They proposed that the structure of these compounds is characterized by NaCl‐type [Zr 2 C 3 ] nanoplates and Al 4 C 3 type [Al 8 C 7 ] layers and these compounds have the general formula of (ZrC)nAl 4 C 3 13‐14 . ZrAlC 2 and Zr 2 Al 3 C 5 with more complex structures have also been successfully synthesized 15 …”

Section: Introductionmentioning

confidence: 99%

Preparation of Zr₃Al₃C₅ ceramic powder by molten salt synthesis

Chen¹,

Ma³

et al. 2021

Int J Applied Ceramic Tech

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Methods for synthesising Zr‐based MAX phases powder generally require high temperature and product processing such as milling, which can introduce impurities and high cost. A new method to syntheszse Zr3Al3C5 powder from Zr, Al, and C particles in NaCl‒KCl molten salt was reported. The effects of temperature, Al content, and type of carbon source on the formation of Al–Zr–C compounds were investigated. The results show that molten salt synthesis can be used to prepare Zr3Al3C5 powder at a low temperature. When additional Al was added to yield a Zr:Al ratio of 2:9 and resin carbon was used as the carbon source, the purity of the prepared Zr3Al3C5 reached 96%. ZrC is always present in the powder as an impurity, which is consistent with many commercial MAX phases.

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“…However, UHTCs usually show intrinsic brittleness, poor oxidation resistance and high density . Recently, a series of new layered ternary transition metal carbides, with general formula of (ZrC) n Al 3 C 2 and (ZrC) n [Al(Si)] 4 C 3 (where n = 1, 2, 3…) were developed in Zr–Al(Si)–C systems, and show excellent flexural strength, Young's modulus, oxidation resistance, and high‐temperature mechanical properties . They are expected to be novel promising high‐temperature structural materials.…”

Section: Introductionmentioning

confidence: 99%

Ablation Behavior of Zr–Al(Si)–C Layered Carbides Modified 3D Needled C/SiC Composites

Yin

Fan

et al. 2018

Adv Eng Mater

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3DN C/SiC composites modified through the combined method of slurry impregnation (SI) with reactive melt infiltration (RMI) can obtain obviously improved mechanical properties. However, when used under the oxyacetylene torch ablation environment, metal melt and low melting point oxides usually lead to the low ablative properties. In this paper, Al 40 Si 60 alloy and Si melt are used to infiltrate 3DN C/SiC preforms impregnated with TiC or ZrC powders, respectively. Large amount of Ti 3 Si(Al)C 2 or Zr 3 Al 3 C 5 (and Zr 3 [Al-(Si)] 4 C 6 ) with nano-laminated structure generated in the modification matrix, which not only increase the flexural strength of the composites, but also reduce the content of low melting point phases in the modification matrix. These layered carbides can keep steady under air flow, thus further improve material's ablative properties. Meanwhile, during the ablation of Zr-Al(Si)-C layered carbides modify 3D needled C/SiC, the high melting point layered carbides act synergistically with the high melting point ZrO 2 generated. They can block the ZrO 2 generated from migrating along with the air flow, so that ZrO 2 can effectively act its pinning effect on the oxide melt and finally obtain desirable ablative properties.

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Syntheses and crystal structures of Si-bearing layered carbides ZrAl8C7 and ZrAl4C4

Cited by 6 publications

References 14 publications

Experimental synthesis and density functional theory investigation of radiation tolerance of Zr₃(Al_1‐_xSi_x)C₂MAX phases

Experimental synthesis and density functional theory investigation of radiation tolerance of Zr₃(Al_1‐_xSi_x)C₂MAX phases

Preparation of Zr₃Al₃C₅ ceramic powder by molten salt synthesis

Ablation Behavior of Zr–Al(Si)–C Layered Carbides Modified 3D Needled C/SiC Composites

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Syntheses and crystal structures of Si-bearing layered carbides ZrAl8C7 and ZrAl4C4

Cited by 6 publications

References 14 publications

Experimental synthesis and density functional theory investigation of radiation tolerance of Zr3(Al1‐xSix)C2MAX phases

Experimental synthesis and density functional theory investigation of radiation tolerance of Zr3(Al1‐xSix)C2MAX phases

Preparation of Zr3Al3C5 ceramic powder by molten salt synthesis

Ablation Behavior of Zr–Al(Si)–C Layered Carbides Modified 3D Needled C/SiC Composites

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Experimental synthesis and density functional theory investigation of radiation tolerance of Zr₃(Al_1‐_xSi_x)C₂MAX phases

Experimental synthesis and density functional theory investigation of radiation tolerance of Zr₃(Al_1‐_xSi_x)C₂MAX phases

Preparation of Zr₃Al₃C₅ ceramic powder by molten salt synthesis