The thermal degradation of graphite and glass-reinforced phenolic insulators have been studied at high temperature by using thermogravimetry analysis (TGA) and Differential Scanning Calorimetry (DSC) analysis. TGA was carried out in a stream of pure nitrogen over temperature range ambient to 900 deg C and DSC analysis to 500 deg C. A heating rate of 10 deg C/min was used for the determination of degradation temperature and heating rates of 5, 10, 20, 30, and 50 deg C/min were used for the estimation of degradation temperature (Tmax) of the insulator at high temperature service and calculation of activation. Activation energy of phenolic resin was calculated as 356 kJ.mol-1 using the Ozawa method. Tmax was determined as 661 deg C for 20 % conversion. The specific heat capacity of graphite phenolic was found as 970 J.kg-1.K-1 at 100 deg C. The half-life of the phenolic resin was determined to be approximately 116.2 s at 3500 deg C. The thermal analysis has been conducted using transient heat conduction and the in-depth temperature distribution was evaluated along the rocket nozzle. The better insulator thickness, including the safety factor for graphite and E-glass-reinforced phenolics, were calculated as 3 and 2 mm, respectively.
High-temperature degradation of reinforced phenolic insulator
Hochtemperaturabbau von verstärkten Phenolharzisolatoren
Journal of Applied Polymer Science ; 67 , 11 ; 1877-1883
1998
7 Seiten, 7 Bilder, 3 Tabellen, 9 Quellen
Article (Journal)
English
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