Effects of Milling Media on the Mechanical Properties of Gas Pressure Sintered alpha/beta-SiAlON

Title
Effects of Milling Media on the Mechanical Properties of Gas Pressure Sintered alpha/beta-SiAlON
Author(s)
김석영천성수민봉기
Keywords
SILICON-NITRIDE CERAMICS; YTTRIA; COLOR
Issue Date
201411
Publisher
KOREAN INST METALS MATERIALS
Citation
METALS AND MATERIALS INTERNATIONAL, v.20, no.6, pp.1011 - 1016
Abstract
Three types of milling media, alumina, zirconia and cemented tungsten carbide (CTC), were used for the solid-state preparation of SiAlON from Si3N4 using Y2O3-Al2O3-AlN as sintering aids. Fully densified alpha and beta dual-phase SiAlON composites were obtained by gas pressure sintering (GPS) at 1750 degrees C for 1.5 hrs. The relative contents of alpha- and beta-SiAlON and grain boundary phases in the sintered samples were affected by the type of milling media, where the main grain boundary phases were alpha-, beta-SiAlON and melilite (Y2Si3O3N4). Zirconium nitride was observed at the grain boundaries of the samples prepared using zirconia media, and WC and Co3W3C were observed with the sample prepared using CTC media due to contamination from the milling media. As a result, the overall mechanical properties, color, and microstructure of SiAlON were affected by the grain boundary phases and the alpha- to beta-SiAlON ratio. The SNZ sample prepared using ZrO2 media showed better mechanical properties than the SNA and SNW samples. These results were compared with those obtained by spark plasma sintering, which was reported previously.
URI
http://hdl.handle.net/YU.REPOSITORY/30436http://dx.doi.org/10.1007/s12540-014-6003-9
ISSN
1598-9623
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공과대학 > 신소재공학부 > Articles
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