Papers by Author: Masaki Sugimoto

Abstract: Silicon carbide (SiC) based fibers with continuous pore structures were synthesized by the precursor method using a polycarbosilane (PCS) and polymethylhydrosiloxane (PMHS) polymer blends. The pore formation process can be explained by hydrogen gas dissolution in the polymer melt and desaturation process of the dissolved gas during the fiber spinning. We investigated the effect of PMHS additives with different chemical and physical natures on the obtained pore structures, because PMHS decomposition process played a role of hydrogen gas source. The individual polymer melts were characterized by viscosity measurement, gas chromatograph analysis and thermogravimetric (TG) analysis in order to obtain details of pore structure control.

Abstract: Polymethylsilsesquioxane (PMSQ) fiber was exposed to metal chloride vapors in a controlled atmosphere or electron beam irradiation in air to promote the curing process. The cured fibers were pyrolyzed at 1273K to compare the efficiency of individual curing method. The cured fibers were investigated by FT-IR, an optical microscope and TG analysis. In the case of successful curing, averaged diameter and tensile strength were analyzed on the obtained Si-O-C fibers.

Abstract: Production of reinforced surface ceramic material was investigated by radiation curing-oxidation method. The originality of this research is to use along with polycarbosilane (PCS) an admixture of another preceramic polymer, polyvinylsilane (PVS). PCS, PVS or their combination in cyclohexane solution were spin-coated onto Al2O3 plates or deposited onto porous substrate by dipping method. After radiation oxidation step, used to preserve the coat on the substrate, a heat treatment was applied for crosslinking of the polymer. Thickness and quality of silicon carbide (SiC) film were investigated after pyrolysis.