Oxidation Characteristics of Carbon Materials Hideaki Sane and Yasuo Uchiyama Corresponding Author, Nagasaki Universi

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Transcription:

Oxidation Characteristics of Carbon Materials Hideaki Sane and Yasuo Uchiyama Corresponding Author, E-mail:sano@net.nagasaki-u.ac.jp Nagasaki University: 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan

Table 1 Standard free energy of C-O system gaseous species.

(a) y axis: normal (b) y axis : logarithmic Fig. 1 Equilibrium amount of species of C-O system with temperature calculated by ChemSage8). Calculating condition; Pressure: 1atm, Volume: variable displacement, initial species; C: 1mol, O2(g): 0.1mol. Fig. 2 Ellingham diagram of C, B4C and SiC.

a) Apparatus for oxidation Fig. 3 Schematic diagram of (a) apparatus for oxidation furnace and (b) sample holder. Fig. 4 Morphological change of C/B4C/SiC composite after oxidation at 1200 Ž for 1, 2 and 5h in dry air.

a) TGA apparatus b) TG-DTA apparatus Fig. 5 Schematic diagram of (a) TGA apparatus and (b) TG DTA apparatus.

Fig. 6 TG-DTA curve of 2150 Ž heat-treated petroleum coke. Fig. 7 DTA curves for carbonized furfural-resin heat-treated at different temperatures20).

(c): Reaction rate (V3) vs oxidation burn-off (a): mass% vs oxidation time (b): Reaction rate (V2) vs oxidation burn-off Fig. 8 TG curve and oxidation rate V2 and V3 of carbonized saran char with and without 1.0mass%-boron loaded at 800t in dry air24).

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