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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.1010
pages 994-1003

COMBUSTION SYNTHESIS OF SiO, IN PREMIXED FLAMES

Chun-Liang Yeh
Department of Aerospace and Systems Engineering, Feng Chia University, 100 Wenhwa Rd., Seatwen, Taichung 40724, Taiwan
E. Zhao
Department of Mechanical Engineering, National Taiwan University, Taipei 106, Taiwan
H. K. Ma
Department of Mechanical Engineering, National Taiwan University, Taipei 106, Taiwan

RÉSUMÉ

An experimental study of gas-phase combustion synthesis of silicon dioxide (SiO2) particles was investigated in premixed propane/air flames. Two different types of organosilicon compounds, hexamethyldisiloxane (HMDSO) and hexamethyldisilazane (HMDSA), were used as silicon precursors. The objective of this research was to study the effects of HMDSO and HMDSA concentrations and flame temperatures on the synthesis of SiO2 particles. The chemical composition of synthesized products was analyzed by an energy dispersive spectrometer (EDS), which was coupled with a scanning electron microscope (SEM). The change in flame structure with the introduction of HMDSO and HMDSA into the flame zone was observed in details and recorded by a high-resolution digital camera. As a small amount of HMDSO or HMDSA was added to premixed mixtures, a secondary flame, orange in color, appeared around the conical luminous zone of C3H8/air flames. At a flame condition of φ (equivalence ratio) = 0.57, when the mole fraction of HMDSO was higher than 0.67%, the appearance of a bright yellow flame brush was observed on the tip of the conical luminous zone. The flame brush phenomenon is believed to be caused by a particle-laden flame. With a higher equivalence ratio, the occurrence of flame brush phenomena was found at a lower HMDSO concentration. When HMDSA was used at flame conditions with high equivalence ratios (φ = 0.65 and 0.73), the flame brush like a flamelet was also observed. Moreover, the measured flame temperature was decreased with the increase of HMDSO and HMDSA mole fractions. The chemical composition of synthesized particles in this study was considered as SiOx, where x ranged from 1.75 to 2.5 when HMDSO was used and from 1.12 to 3.1 when HMDSA was entrained. This implies that the synthesized product is the combination of silicon monoxide (SiO), SiO2, and silicate (SiO32− or SiO44−). The variation of x values in SiOx suggests that HMDSO produce the synthesized particles with a composition closer to pure silicon dioxide (SiO2) than does the HMDSA.


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