Low-temperature chemical vapour curing using iodine for fabrication of continuous silicon carbide fibres from low-molecular-weight polycarbosilane

Infusiblization of Iodine Doped Polycarbosilane for Silicon Carbide Fiber Fabrication

“…Figure 2 shows thermogravimetric graphs of as-received and iodine doped PCSs, those have stabilized with 10% of iodine vapor under reduced pressure (1.6 torr) at 180 o C for 2 h. The ceramic yield of iodine doped PCSs was increased in proportion to iodine contents according to thermogravimetric analysis. This improvement for ceramic yield of PCS is related with its increased molecular weight, which resulted from the cross-linking reaction in the PCS by iodine vapor during the stabilization [7,11]. This cross-linking reaction can be accomplished by conventional thermal curing with oxygen atmosphere, however it needs relatively high temperature around 300°C.…”

Synthesis Of SiC/Cu Composite Powders From Polycarbosilane And Cupric Nitrate Trihydrate

“…SiC powder with an average size of 20 µm was mixed with 2% hexane solution of 1% Al-modified PCS (Al-PCS, TBMTech Co., Korea) [8]. Then the solvent was extracted by a rotary evaporator.…”

Silicon Carbide Fibers Derived from Polycarbosilane Doped with Iodine as Oxygen Inducer

“…On the other hand, the low molecular weight PCS results in a lower viscosity of PCS and shows good spinnability. The disadvantage of using the low molecular weight PCS, the fiber shaped PCS can be melted and failed to keep its original shape during the curing and heat treatment process [6]. The conversion mechanism from thermoplastic to thermosetting is carried out by oxygen cross-linkage on PCS immediately after the absorption and diffusion of oxygen into the PCS.…”