Preparation of Ca-α SiAlON powder by reduction-nitridation in a gas mixture of C3H8 and NH3

Mikinori HOTTA; Hideki KITA; Tomohiro YAMAKAWA; Junichi TATAMI; Katsutoshi KOMEYA; Takeshi MEGURO

doi:10.2109/jcersj2.120.155

Note

Preparation of Ca-α SiAlON powder by reduction-nitridation in a gas mixture of C₃H₈ and NH₃

Mikinori HOTTA, Hideki KITA, Tomohiro YAMAKAWA, Junichi TATAMI, Katsutoshi KOMEYA, Takeshi MEGURO

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Keywords: SiAlON, Powder, Reduction-nitridation, Gas, Morphology, Formation process

JOURNAL FREE ACCESS

2012 Volume 120 Issue 1400 Pages 155-157

DOI https://doi.org/10.2109/jcersj2.120.155

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Abstract

Ca-α SiAlON powders were synthesized from a SiO₂–Al₂O₃–CaCO₃ powder mixture by reduction-nitridation with C₃H₈–NH₃ gas. Ca-α SiAlON with small amounts of AlN and β-SiAlON phases was produced at 1450°C for 120 min. Angular particles and agglomerated and bonded particles with irregular shapes were formed. In the product prepared at 1450°C without any holding time, Si₂N₂O was detected as an intermediate phase, in addition to the Ca-α SiAlON, β-SiAlON and AlN phases. A large number of agglomerated and bonded particles were observed.

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