Manufacture and examination of C/Si3N4 nanocomposites

Cs Balázsi; F. S. Cinar; O. Addemir; F. Wéber; P. Arató

doi:10.1016/j.jeurceramsoc.2003.10.021

Manufacture and examination of C/Si₃N₄ nanocomposites

Cs Balázsi^*, F. S. Cinar, O. Addemir, F. Wéber, P. Arató

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

C/Si₃N₄ nanocomposites have been prepared through carbon black nanograins, graphite micrograins addition to silicon nitride starting powder. The role of excess oxygen was examined by oxidising the alpha silicon nitride starting powder. For nanocomposite processing sinter-HIP and hot press have been applied. Bending strength and elastic modulus have been found to be influenced by amount of carbon black and graphite introduced in silicon nitride matrix. In the case of HIP samples a desintering process was observed. During pressure-less sintering step the structure retained the α-Si₃N₄ phase, after second sintering step new phase(s) appeared. Hot pressed samples with a higher α-Si₃N₄ phase contribution showed considerable improvement of hardness.

Original language	English
Pages (from-to)	3287-3294
Number of pages	8
Journal	Journal of the European Ceramic Society
Volume	24
Issue number	12
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2003.10.021
Publication status	Published - 2004
Externally published	Yes

Funding

Csaba Balázsi thanks for OTKA Postdoctoral Research Grant (D38478) and János Bolyai Research Grant. Support from Hungarian State Eötvös Fellowhsip is greatly acknowledged. This work was supported by OTKA Foundation (No. T43704).

Funders	Funder number
Hungarian Scientific Research Fund	T43704, D38478

Keywords

Nanocomposites
Porosity
SiN
Sintering
Strength

Access to Document

10.1016/j.jeurceramsoc.2003.10.021

Cite this

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title = "Manufacture and examination of C/Si3N4 nanocomposites",

abstract = "C/Si3N4 nanocomposites have been prepared through carbon black nanograins, graphite micrograins addition to silicon nitride starting powder. The role of excess oxygen was examined by oxidising the alpha silicon nitride starting powder. For nanocomposite processing sinter-HIP and hot press have been applied. Bending strength and elastic modulus have been found to be influenced by amount of carbon black and graphite introduced in silicon nitride matrix. In the case of HIP samples a desintering process was observed. During pressure-less sintering step the structure retained the α-Si3N4 phase, after second sintering step new phase(s) appeared. Hot pressed samples with a higher α-Si3N4 phase contribution showed considerable improvement of hardness.",

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AU - Balázsi, Cs

AU - Cinar, F. S.

AU - Addemir, O.

AU - Wéber, F.

AU - Arató, P.

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AB - C/Si3N4 nanocomposites have been prepared through carbon black nanograins, graphite micrograins addition to silicon nitride starting powder. The role of excess oxygen was examined by oxidising the alpha silicon nitride starting powder. For nanocomposite processing sinter-HIP and hot press have been applied. Bending strength and elastic modulus have been found to be influenced by amount of carbon black and graphite introduced in silicon nitride matrix. In the case of HIP samples a desintering process was observed. During pressure-less sintering step the structure retained the α-Si3N4 phase, after second sintering step new phase(s) appeared. Hot pressed samples with a higher α-Si3N4 phase contribution showed considerable improvement of hardness.

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