Journal
MATERIALS LETTERS
Volume 139, Issue -, Pages 303-306Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2014.10.113
Keywords
Ceramics; Nanocomposites; Ceramic composites; SiAlON; Pressureless sintering; Precursor
Funding
- National Natural Science Foundation of China [51272208]
- Program for New Century Excellent talents in University [NCET-12-0454]
- Program for Young Excellent Talents in Shaanxi Province [2013KJXX-50]
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beta-SiAlON/hexagonal boron nitride (h-BN) nanocomposite was successfully fabricated by a precursor infiltration and pyrolysis (PIP) route using boric acid and urea as precursors of h-BN, and the composite was pressureless sintered at 1750 degrees C in nitrogen. XRD and XPS results confirmed that the composite was composed of beta-SiAlON and h-BN phases. Microstructure observation showed that the nanoflake-like h-BN particles with width of 1-2 mu m and thickness of 50-200 nm were formed and distributed homogeneously in the composite. The nanoflake-like h-BN particles were inclined to exist in the beta-SiAlON grain boundaries. The machinability and thermal shock resistance were improved due to the formation of h-BN in beta-SiAlON matrix. (C) 2014 Elsevier B.V. All rights reserved.
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