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Effect of heating rate and temperature on the carbonization process of commercial viscose fibers

The stabilized fibers are then carbonized in argon at temperature ranging from 600oC to 1200 oC with the heating rate of 5 oC.min-1 . Experimental results show that the obtained fibers have carbon content above 94 wt% and diameters of about 8 m. These fibers are potential to produce activated carbon fibers. | Journal of Science & Technology 127 (2018) 071-074 Effect of Heating Rate and Temperature on the Carbonization Process of Commercial Viscose fibers Nguyen Huu Son1, Vu Le Hoang2, Pham Van Cuong2, Le Thai Hung1* 1 Hanoi University of Science and Technology, No.1, Dai Co Viet, Hai Ba Trung, Hanoi, Vietnam 2 General Department of Military Industries and Manufacture, Bac Tu Liem, Hanoi, Vietnam Received: January 16, 2018; Accepted: June 25, 2018 Abstract Effect of heating rate and temperature on the carbonization process of commercial Viscose (cellulosic based precursor) fibers are investigated in the present study. Several carbonization experiments are conducted on stabilized fibers with carbon content of 59.72 wt% and diameter of about 13.3 m. The Viscose fibers are stabilized with the catalyst of mixture urea/diamonium hydrogen phosphate in air at temperature of 250 oC. The stabilized fibers are then carbonized in argon at temperature ranging from 600 oC to 1200 oC with the heating rate of 5 oC.min-1. Experimental results show that the obtained fibers have carbon content above 94 wt% and diameters of about 8 m. These fibers are potential to produce activated carbon fibers. Keywords: Carbonization, carbon fibers, Viscose, cellulose based precursor 1. Introduction* prevent the elimination of carbon in residual fibers. In this stage, several chemical reactions take place at the same time, which brings out a significant reduction of fibers’s weight. The formation of pre-structure proceeds subsequently at elevated temperatures to make carbon matrices [2, 5, 6]. Viscose rayon fiber (Cellulosic based precursor), PAN fiber (Polyacrylonitrile) and Pitch based precursor are widely used materials to manufacture carbon fibers [1, 2]. Among them, Viscose rayon fiber is the most common precursor for commercial carbon fibers production. Developing carbon fiber from Viscose fiber is generally subjected to three processes namely stabilization, carbonization, and .