3차원 인쇄를 이용한 Polycarbosilane 성형물의 열물성과 열분해 변형 특성

Abstract

Additive Manufacturing (AM) does not require a mold, so it has the advantage of simply implementing various shapes. However, compared to metal and polymer materials currently in the commercialization stage, ceramic materials require sintering steps after molding, and the development speed is slow due to the deformation characteristics that occur in this process. In order to apply SiC, a representative sintering material, to a lamination molding technology, a method to which a polymerized ceramic (PDC) technology is applied is being developed together in addition to a classical powder molding method. In this paper, ink capable of photo-molding was blended using polycarbonosilane (PCS), which is well known as a precursor of SiC, and the ink was molded with a digital light processing (DLP) type printer. Forming characteristics and errors of printed matter were confirmed after printing various phenomena, and it could be seen that the molded matter differs in deformation behavior depending on the shape, size, hardening, and heat treatment conditions of the model. The deformation was minimized by controlling the gas partial pressure generated during the pyrolysis process based on the results of the thermal properties of the printed materials obtained using the TG-DSC, DIL, and high-temperature microscope. Then, in order to control the shrinkage rate that occurs during pyrolysis, SiC was used as the filler to blend in ink capable of photo-molding, and then printed out the mixture to carry out thermal treatment. The densification and defects of the heat treatment molded product were verified using X-ray tomography.