Effects of quasi-carbonization process on the mechanical properties of spun yarn type quasi-carbon fabrics

Abstract

In this paper we have extensively studied what and how processing parameters for quasi-carbonization influence the breaking strength and modulus of resulting quasi-carbon fabrics that are prepared from stabilized PAN fabrics with a spun yarn texture. Seven processing parameters have been considered as follows: applied tension, final heat-treatment temperature, heating rate, heating step, holding time, cooling rate, and purging gas purity. The results indicate that optimal uses of applied tension, final heat-treatment temperature, heating rate, and heating step during quasi-carbonization process are primarily important to increase the tensile properties of quasi-carbon fabrics and holding time, cooling rate, and purging gas purity are less importantly contributed.

Effect of quasi‐carbonization processing parameters on the mechanical properties of quasi‐carbon/phenolic composites

“…Such behavior was similarly found from the breaking strength and modulus of quasi-carbon fabric studied earlier. 5 No fiber breakage or damage due to the tension applied in this work was observed in the quasi-carbon fabrics and the composites. Figure 4 shows the effect of the heating rate on the flexural strength and modulus of quasi-carbon/ phenolic composites.…”

“…The reason for applying the tension of 33 kgf in this work was that the breaking strength and modulus of quasi-carbon fabrics were increased with the applied tension increasing from 0 to 33 kgf, and they were most greatly enhanced with the tension of 33 kgf, as found in our earlier study. 5 As can be seen, the flexural strength and modulus of quasi-carbon/phenolic composites were greatest in the presence of the tension of 33 kgf. The flexural strength and modulus of the stabilized PAN/phenolic composite were greatly increased by 560 and 249%, respectively, compared with those of the quasi-carbon/phenolic composite in the presence of 0 kgf during the quasi-carbon fabric preparation.…”

“…It was found in our earlier study 5 that the heating rate, HTT, and tension are the most critical processing parameters for controlling the mechanical properties of PAN-based quasi-carbon fabrics. Accordingly, two-directional quasi-carbon/phenolic composites were prepared with quasi-carbon fabrics produced with the three processing parameters previously mentioned.…”

“…One practical approach for that is to optimize the processing parameters for quasi-carbonization, such as the HTT, heating rate, tension, and heating step. 3,5 A thermosetting phenolic resin has good thermal insulation, thermal stability, heat-resistant mechanical properties, and interfacial adhesion with carbon fibers. Hence, phenolic resins have been widely used for a long time not only as frequently used materials in commodity and industrial applications but also as advanced materials in aerospace and military applications.…”

“…2 When stabilized PAN fibers are treated at high temperatures, the chemical and physical characteristics of the carbon fibers obtained strongly depend on a variety of processing parameters. [3][4][5] Among the parameters, final HTT is most critical. It has been reported that HTT is very important for controlling the mechanical, thermal, and electrical properties of PAN-based fibers partially carbonized in the range of 400-9508C.…”