Synthesis and characterization of silicon carbide powders converted from metakaolin-based geopolymer
[ X ]
Tarih
2016
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Blackwell Publishing Inc.
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Silicon carbide (SiC) ceramic powders were synthesized by carbothermal reduction in specific geopolymers containing carbon nanopowders. Geopolymers containing carbon and having a composition M2O·Al2O3·4.5SiO2·12H2O+18C, where M is an alkali metal cation (Na+, K+, and Cs+) were carbothermally reacted at 1400°C, 1500°C, and 1600°C, respectively, for 2 h under flowing argon. X-ray diffraction and microstructural investigations by SEM/EDS and TEM were made. The geopolymers were gradually crystallized into SiC on heating above 1400°C and underwent significant weight loss. SiC was seen as the major phase resulting from Na-based geopolymer heated to ?1400°C, even though a minor amount of Al2O3 was also formed. However, phase pure SiC resulted with increasing temperature. While a slight increment of the Al2O3 amount was seen in potassium geopolymer, Al2O3 essentially replaced cesium geopolymer on heating to 1600°C. SEM revealed that SiC formation and a compositionally variable Al2O3 content depended on the alkaline composition. Sodium geopolymer produced high SiC conversion into fibrous and globular shapes ranging from ~5 ?m to nanosize, as seen by X-ray diffraction as well as SEM and TEM, respectively. © 2016 The American Ceramic Society
Açıklama
Anahtar Kelimeler
Geopolymers, Nanoparticles, Silicon Carbide, Synthesis
Kaynak
Journal of the American Ceramic Society
WoS Q Değeri
N/A
Scopus Q Değeri
Q1
Cilt
99
Sayı
7
Künye
Bagci, C., Kutyla, G.P., Seymour, K.C., Kriven, W.M. (2016). Synthesis and characterization of silicon carbide powders converted from metakaolin-based geopolymer. Journal of the American Ceramic Society, 99(7), 2521–2530.
