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- Title
Fabrication of Silicon Nitride Nanoceramics and their Tribological Properties.
- Authors
Jae-Hee Kim; Kumar, B. Venkata Manoj; Seong-Hyeon Hong; Hai-Doo Kim
- Abstract
Si2N2O secondary phase-free, fully dense nano-Si3N4 ceramics (≥97% of theoretical density) were developed by combining carbothermal reduction treatment and spark plasma sintering (SPS), and their tribological properties were investigated by subjecting to self-mated sliding under unlubricated conditions. Commercially available Si3N4 nanopowder was used as a starting material and phenolic resin was used for carbothermal reduction, which was conducted at 1450°C for 10 h. Fully densified Si2N2O phase-free Si3N4 ceramics with a wide range of grain size from 90 nm to 1.5 μm were fabricated by varying SPS temperature from 1550° to 1750°C. The microstructure of the developed Si3N4 ceramics was changed from nano equi-axed at 1550°C to large elongated bimodal grain morphology at 1700° or 1750°C. The frictional behavior was not dependent on the microstructure, but the wear rate was strongly influenced such that it decreased by an order of magnitude (from 9.7 × 10−5 to 0.88 × 10−5 mm3/N·m) with decreasing grain size. The dominant wear mechanism was changed from the delamination of tribochemical layer for the ceramics with nano equi-axed grain microstructure to the fracture and grain pull-out for the ceramics with duplex microstructure.
- Subjects
SILICON nitride; NANOPARTICLES; CERAMICS; CONSTRUCTION materials; MICROSTRUCTURE; TRIBOLOGY; SURFACES (Technology); SINTERING; POWDER metallurgy
- Publication
Journal of the American Ceramic Society, 2010, Vol 93, Issue 5, p1461
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2010.03614.x