SiC/HfyTa1-yCxN1-x/C ceramic nanocomposites with HfyTa1-yCxN1-x-carbon core-shell nanostructure and the influence of the carbon-shell thickness on electrical properties

被引：50

作者：

Wen, Qingbo ^{[2
]}

Yu, Zhaoju ^{[1
,3
]}

Xu, Yeping ^{[4
]}

Lu, Yan ^{[5
]}

Fasel, Claudia ^{[2
]}

Morita, Koji ^{[6
]}

Guillon, Olivier ^{[7
]}

Buntkowsky, Gerd ^{[4
]}

Ionescu, Emanuel ^{[2
]}

Riede, Ralf ^{[2
,3
]}

机构：

[1] Xiamen Univ, Coll Mat, Key Lab High Performance Ceram Fibers, Minist Educ, Xiamen 361005, Peoples R China

[2] Tech Univ Darmstadt, Inst Mat Wissensch, Otto Berndt Str 3, D-64287 Darmstadt, Germany

[3] Xiamen Univ, Coll Mat, Fujian Key Lab Adv Mat, Xiamen 361005, Peoples R China

[4] Tech Univ Darmstadt, Eduard Zintl Inst Anorgan & Phys Chem, Alarich Weiss Str 4, D-64287 Darmstadt, Germany

[5] Chinese Acad Sci, Lab Adv Polymer Mat, Inst Chem, Beijing 100190, Peoples R China

[6] Natl Inst Mat Sci, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

[7] Forschungszentrum Julich, Inst Energie & Klimaforsch Werkstoffsynth & Herste, Wilhelm Johnen Str, D-52425 Julich, Germany

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2018年 / 6卷 / 04期

关键词：

SOURCE-PRECURSOR SYNTHESIS; CARBIDE NANOPARTICLES; OXIDATION BEHAVIOR; HAFNIUM CARBIDE; TANTALUM; MICROSTRUCTURE; COMPOSITES; TAC; CONVERSION; PYROLYSIS;

D O I：

10.1039/c7tc05023b

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dense monolithic SiC/HfyTa1-yCxN1-x/C (y = 0, 0.2 and 0.7) ceramic nanocomposites were prepared upon spark plasma sintering of amorphous SiHfTaC(N) ceramic powders which were synthesized from single-source-precursors. The microstructural evolution of the ceramic powders was investigated using elemental analysis, X-ray diffraction, Raman spectroscopy and transmission electron microscopy (TEM). The results reveal that the powdered and dense monoliths of SiC/HfyTa1-yCxN1-x/C ceramic nanocomposites annealed at T >= 1700 degrees C and at 2200 degrees C, respectively, are characterized by the presence of a homogeneous dispersion of HfyTa1-yCxN1-x-carbon core-shell nanoparticles within a beta-SiC matrix. Hf/Ta atomic ratios (or y values) of the in situ generated HfyTa1-yCxN1-x-carbon core-shell nanoparticles can be controlled precisely by molecular tailoring of the preceramic precursors, which further tunes the thickness of the in situ formed carbon shell. Interestingly, with increasing the value y the thickness of the carbon shell increases, while the electrical conductivity of the dense monolithic SiC/HfyTa1-yCxN1-x/C (y = 0, 0.2 and 0.7) nanocomposites significantly reduces. The unique HfyTa1-yCxN1-x-carbon core-shell nanostructure opens a new strategy towards tailoring the electrical conductivity of SiC/HfyTa1-yCxN1-x/C nanocomposites for potential electromagnetic applications in harsh environments.

引用

页码：855 / 864

页数：10

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