Nucleation and growth of [alpha][prime]-SiAlON on [alpha]-Si[sub 3]N[sub 4]

Journal Article · Fri Jul 01 00:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb07041.x· OSTI ID:6889291

Hwang, S L; Chen, I W ^[1]

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1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

Morphology, composition, and growth defects of [alpha][prime]-SiAlON have been studied in a fine-grained material with an overall composition Y[sub 0.33]Si[sub 10]Al[sub 2]O[sub 1]N[sub 15] prepared from [alpha]-Si[sub 3]N[sub 4], AlN, Al[sub 2]O[sub 3], and Y[sub 2]O[sub 3] powders. TEM analysis has shown that fully grown [alpha][prime]-SiAlON grains always contain an [alpha]-Si[sub 3]N[sub 4] core, implicating heterogeneous nucleation operating in the present system. The growth mode is epitaxial, despite the composition and lattice parameter difference between [alpha]-Si[sub 3]N[sub 4] and [alpha][prime]-SiAlON. Lacking a special growth habit, the growth typically proceeds from more than one site on the seed crystals, and the different growth fronts impinge on each other to give an equiaxed appearance of [alpha][prime]-SiAlON. Misfit dislocations on the [alpha]/[alpha][prime] interface are identified as [0001] type (b = 5.62 [angstrom]) and 1/3 [1[bar 2]10] type (b = 7.75 [angstrom]). These nucleation and growth characteristics dictate that microstructural control of [alpha][prime]-SiAlON must rest on the size distribution of the starting [alpha]-Si[sub 3]N[sub 4] powder.

• OSTI ID: 6889291
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:7; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
ALUMINIUM NITRIDES
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
GRAIN GROWTH
INFORMATION
MICROSCOPY
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
NUCLEATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES