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Silicon Nitride/Silicon Carbide Nanocomposite Materials: I, Fabrication and Mechanical Properties at Room Temperature
Author(s) -
Herrmann Mathias,
Schuber Christian,
Rendtel Andreas,
Hübner Heinz
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02456.x
Subject(s) - sintering , materials science , nanocomposite , silicon carbide , fabrication , fracture toughness , pyrolysis , silicon nitride , hot pressing , composite material , carbide , thermal decomposition , silicon , carbon fibers , chemical engineering , metallurgy , composite number , chemistry , medicine , alternative medicine , organic chemistry , pathology , engineering
The fabrication of dense Si 3 N 4 /SiC nanocomposite materials that contained 2.5‐30 wt% SiC via gas‐pressure sintering and hot pressing was investigated. The SiC particles originated from admixed commercial SiC powders, SiCN powders produced by plasma synthesis, in situ reaction pyrolysis of carbon‐coated Si 3 N 4 particles, and pyrolysis of a polycarbosilazane‐based SiCN precursor. Based on thermodynamic calculations, criteria for minimum liquid‐phase decomposition during sintering were developed. The best sintering results were obtained for sintering cycles that observed this criteria. Materials that contained plasma‐synthesized SiCN exhibited high strengths (835‐995 MPa) and fracture toughness values (7.4‐7.8 MPam 1/2 ) at room temperature. Post‐sintering thermal treatments led to a strength reduction.