Thermoanalytical studies on acid-treated rice husk and production of some silicon based ceramics from carbonised rice husk

Abstract

Please cite this article in press as: M. Ali, M.A. Tindyala, Thermoanalytical studies on acid-treated rice husk and production of some silicon based ceramics from carbonised rice husk, J. Asian Ceram. Soc. (2015), http://dx. Keywords:Acid-treated rice husk Non-isothermal TG Thermal degradation Energy of activation Flynn and Wall expression a b s t r a c t Acid pre-treatment of rice husk activated amide groups, thereby rendering the material to earlier decomposition as compared to raw rice husk when subjected to thermal analysis under non-isothermal conditions. The role of heating rate on thermal characteristics of acid-treated rice husk and energy of activation of thermal degradation were discussed in this study. The latter was dealt using Flynn and Wall equation and studied over a range of thermal destruction. Comparison of TG curves, at 5 and 10 • C/min revealed that degradation rate was faster in case of faster heating rate up to about 50% weight loss and then retarded resulting in lower final degradation temperature. It can be concluded from energy calculations that, as degradation proceeded, overall energy of activation increased up to 50% weight reduction. TG analysis was followed by high temperature pyrolysis of carbonised rice husk under argon and nitrogen atmospheres to obtain carbide, nitride, and oxynitride of silicon. Formation of different products was confirmed by FT-IR and XRD, and yield was calculated through HF dissolution method. Argon pyrolysis was proved efficient, as compared to nitrogen and closed tube pyrolysis, in yielding 30% by weight of silicon carbide from carbonised rice husk.

Influence of roasting-quenching pretreatment on the rice husk silica prepared by calcination method

“…While on the second range, the mass loss of heated RH was caused by the oxidation of carbons. The results above are in line with articles that have been previously reported [20][21][22]. Figure 2 illustrates the effect of R&Q treatment on the remaining potassium content in RQRH.…”

Microstructural and Mechanical Properties of Alumina (Al2O3) Matrix Composites Reinforced with SiC from Rice Husk by Spark Plasma Sintering

“…Silicon carbide (SiC) was first synthesized successfully from rice husk by Cutler in the early 1970's 11,12 . Consequently, various techniques such as thermal plasma reactors 13 gas furnaces 14 , thermogravimetry-differential scanning calorimetry (TGA-DSC) 15 and hydrothermal carbonization 16 were experimentally employed to synthesize SiC from rice husk with a high degree of success.…”

α-Si3N4 and Si2N2O whiskers from rice husk and industrial rice husk ash

“…There are different works on the synthesis of silicon carbide starting from rice husk, pyrolyzed rice husk, or rice husk ash prepared under laboratory conditions [10]. Works focusing on silicon nitride and silicon oxynitride production are less frequent, and in most cases, rice husk pretreatments were usually employed, where grinding [11], pyrolysis [12], digestion in acid solutions [13], and other similar methods [9,10,12,[14][15][16][17][18][19][20][21][22][23][24] have been used. Pretreatments pose a burden and additional costs to an industrial operation.…”