부산대학교 도서관

Silicon Carbide (SiC) is an inorganic material processing properties such as good thermal resistance, high hardness and excellent chemical resistance. Due to all these advantages, it has been regarded as one of the promising materials for membrane filtration. In this study, atmospheric plasma spraying (APS) technique was utilized to produce SiC coating onto titanium substrate. However, severe decomposition of SiC powder at high temperature heavily reduces the coating thickness and mechanical strength. Therefore, in this study, three approaches were introduced to deal with this problem. Firstly, sol-gel method was applied to create a SiO2 layer on the SiC surface. Secondly, sol-gel method with sodium dodecyl sulfate (SDS) was also applied. At last, mechanically mixed different ratio of alumina to SiC was produced. Afterwards, SEM images was utilized to investigate the morphology of both the powder and the coating surface; XRD was used to discover the variation of characteristic peaks before/after APS. Adhesion test was also conducted to understand the mechanical strength of each sample; Corrosion test was conducted as well. At last, polystyrene rejection and pure water flux were conducted to investigate the filtration efficiency of each sample. Results indicate that all these modification methods can do enhance the coating thickness and adhesion force between substrate and coating; furthermore, compared with sol-gel modified samples, samples containing alumina (Al2O3) exhibit excellent adhesion force and high polystyrene rejection (~ 99%), which can be concluded that SiC/Al2O3 sample is more suitable for water filtration application.