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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

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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
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)

Submitter: 大野 宗一

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