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燃焼合成された α- および β-SiAlON の SPS 焼結温度と機械的性質の関係
Title: | 燃焼合成された α- および β-SiAlON の SPS 焼結温度と機械的性質の関係 |
Other Titles: | Relationships between Spark Plasma Sintering Temperature and Mechanical Properties of Combustion-Synthesized α- and β-SiAlON |
Authors: | 越山, 将行1 Browse this author | 酒向, はづき2 Browse this author | 大野, 宗一3 Browse this author →KAKEN DB | 松浦, 清隆4 Browse this author →KAKEN DB |
Authors(alt): | Koshiyama, Masayuki1 | Sako, Hazuki2 | Ohno, Munekazu3 | Matsuura, Kiyotaka4 |
Keywords: | SiAlON | combustion synthesis | spark plasma sintering | mechanical property | self-propagating high-temperature synthesis |
Issue Date: | Apr-2015 |
Publisher: | 日本金属学会 |
Journal Title: | 日本金属学会誌 |
Journal Title(alt): | Journal of the Japan Institute of Metals |
Volume: | 79 |
Issue: | 4 |
Start Page: | 191 |
End Page: | 194 |
Publisher DOI: | 10.2320/jinstmet.J2014057 |
Abstract: | Combustion-synthesized Y-α-SiAlON and Ca-α-SiAlON powders have been consolidated by Spark Plasma Sintering (SPS) at 1300-1450℃ for 10 min, and the mechanical properties of the consolidated bulk samples were investigated. XRD analysis revealed that α-SiAlON partially transforms into β-SiAlON during the SPS and a bulk of α/β-SiAlON mixture was obtained. The fraction of β-SiAlON increases with the increase in sintering temperature and the α to β transformation ratio is high for Y-α-SiAlON compared with Ca-α-SiAlON. The hardness of the consolidated bulk increases with sintering temperature and after reaching the peak at 1350℃ the hardness gradually decreases with temperature in both the cases of Y-α-SiAlON and Ca-α-SiAlON. The increase in hardness with temperature arises from increase in density of the sintered body, while the decrease in hardness results from grain growth due to high temperatures. The fracture toughness monotonically increases with temperature and does not show a peak for both SiAlONs, although Y-α-SiAlON always exhibits higher toughness than Ca-α-SiAlON. The higher toughness of the Y-α-SiAlON is attributable to its higher fraction of transformed β-SiAlON, because the elongated shape of β-SiAlON leads to prevention of crack propagation. |
Type: | article |
URI: | http://hdl.handle.net/2115/75374 |
Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 大野 宗一
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