Yttrium Oxide‐Assisted  CRN  Synthesis of Silicon Oxynitride Powders with Controlled Morphology | Zendy

Zhou Yao | Zendy; Liu Qian | Zendy; Zhou Hu | Zendy; Zhuang Jiandong | Zendy

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Yttrium Oxide‐Assisted CRN Synthesis of Silicon Oxynitride Powders with Controlled Morphology

Author(s) -

Zhou Yao,

Liu Qian,

Zhou Hu,

Zhuang Jiandong

Publication year - 2013

Publication title -

journal of the american ceramic society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.9

H-Index - 196

eISSN - 1551-2916

pISSN - 0002-7820

DOI - 10.1111/jace.12579

Subject(s) - eutectic system , carbothermic reaction , materials science , mesoporous material , chemical engineering , carbon fibers , composite number , yttrium , silicon , morphology (biology) , mesoporous silica , phase (matter) , oxide , catalysis , metallurgy , microstructure , composite material , chemistry , organic chemistry , biology , engineering , genetics , carbide

Si 2 N 2 O powders were synthesized at low temperatures by a Y 2 O 3 ‐assisted‐carbothermal reduction nitridation ( CRN ) with mesoporous silica/carbon composite as raw material. Experimental results showed that with the addition of Y 2 O 3 , the CRN reaction temperature decreased from 1380°C to 1250°C. The mechanism for Y 2 O 3 reducing the CRN temperature was discussed in detail. It was found that the occurrence of Si 2 N 2 O at low temperatures was due to the formation of an eutectic intermediate phase as Y 2 SiO 5 , which was the reaction product of Y 2 O 3 and mesoporous SiO 2 . In addition, spherical and rod‐like Si 2 N 2 O powders were found to be readily obtained by selecting the mesoporous silica/carbon composite precursors with mesoporous silica spheres and rod‐like SBA ‐15, respectively.

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