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Tribological Properties of Si 3 N 4 / SiC Nano–Nano Composite Ceramics
Author(s) -
Shin JungHoo,
Kumar B. Venkata Manoj,
Kim JaeHee,
Hong SeongHyeon
Publication year - 2011
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.1551-2916.2011.04847.x
Subject(s) - materials science , spark plasma sintering , fracture toughness , ceramic , nano , composite material , composite number , tribology , sintering , toughness , elastic modulus , grain size , carbothermic reaction , microstructure , carbide
Fabrication of Si 2 N 2 O phase free, fully densified Si 3 N 4 / SiC nano–nano composite ceramics was done by combining a carbothermal reduction treatment ( CRT ) and a spark plasma sintering ( SPS ) using commercially available Si 3 N 4 and SiC nano‐powders, and their mechanical and tribological properties were investigated. CRT was conducted at 1450°C for 10 h with a phenolic resin and SPS was carried out at 1550°C for 5 min, which yielded the fully dense (>98% of theoretical density) Si 3 N 4 / SiC nano–nano ceramics with ~100 nm grain size. The elastic modulus, hardness, and fracture toughness increased with increasing SiC content up to 20 wt%. The wear rate of Si 3 N 4 / SiC nano–nano ceramics decreased from 2.0×10 −5 to 6.76×10 −6 mm 3 /Nm with 20 wt% SiC addition, resulting from the increased hardness and fracture toughness.