Novel precursor-derived Al-C-N-(O)-based ceramic additive for the low-temperature pressureless sintering of silicon nitride

Sea Hoon Lee, Markus Weinmann, Peter Gerstel, Georg Rixecker, Sung Churl Choi, Fritz Aldinger

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A polymer, which by pyrolysis transforms into Al-C-N-(O) ceramics, was synthesized from trimethylamine alane and cyan amide, and its applicability as a sintering additive for Si3N4 was investigated. Si3N4 powders were mixed with the precursor by treatment with organic slurries of the precursor to induce the homogeneous distribution of the additive. The green-bodies were pretreated in air or NH3 at 800 °C to control the chemical composition of the additive, through which the densification of Si3N4 could be improved. Dense samples with very tine grains (<2 μm) were obtained after sintering at 1600 °C in 0.1 MPa N2. Besides silicon nitride, submicrometer silicon carbide particles were observed in the samples, indicating that this procedure (i.e., the use of this novel sintering additive) also allows for the fabrication of SiC-Si3N4 composites.

Original languageEnglish
Pages (from-to)1713-1721
Number of pages9
JournalJournal of Materials Research
Volume23
Issue number6
DOIs
StatePublished - 2008 Jun 1

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Silicon nitride
silicon nitrides
sintering
Sintering
ceramics
Temperature
slurries
Slurries
densification
Densification
Amides
Silicon carbide
silicon carbides
amides
pyrolysis
chemical composition
Pyrolysis
Powders
Polymers
Fabrication

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Lee, Sea Hoon ; Weinmann, Markus ; Gerstel, Peter ; Rixecker, Georg ; Choi, Sung Churl ; Aldinger, Fritz. / Novel precursor-derived Al-C-N-(O)-based ceramic additive for the low-temperature pressureless sintering of silicon nitride. In: Journal of Materials Research. 2008 ; Vol. 23, No. 6. pp. 1713-1721.
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abstract = "A polymer, which by pyrolysis transforms into Al-C-N-(O) ceramics, was synthesized from trimethylamine alane and cyan amide, and its applicability as a sintering additive for Si3N4 was investigated. Si3N4 powders were mixed with the precursor by treatment with organic slurries of the precursor to induce the homogeneous distribution of the additive. The green-bodies were pretreated in air or NH3 at 800 °C to control the chemical composition of the additive, through which the densification of Si3N4 could be improved. Dense samples with very tine grains (<2 μm) were obtained after sintering at 1600 °C in 0.1 MPa N2. Besides silicon nitride, submicrometer silicon carbide particles were observed in the samples, indicating that this procedure (i.e., the use of this novel sintering additive) also allows for the fabrication of SiC-Si3N4 composites.",
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Novel precursor-derived Al-C-N-(O)-based ceramic additive for the low-temperature pressureless sintering of silicon nitride. / Lee, Sea Hoon; Weinmann, Markus; Gerstel, Peter; Rixecker, Georg; Choi, Sung Churl; Aldinger, Fritz.

In: Journal of Materials Research, Vol. 23, No. 6, 01.06.2008, p. 1713-1721.

Research output: Contribution to journalArticle

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AU - Lee, Sea Hoon

AU - Weinmann, Markus

AU - Gerstel, Peter

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AU - Choi, Sung Churl

AU - Aldinger, Fritz

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