ポリカルボシランとナノ粒子によるメソポーラス炭化ケイ素の作製

Abstract

Mesoporous silicon carbide SiC ceramics were produced via the pyrolysis of polycarbosilane PCS with and without SiC nano sized particle filler, and their pore characteristics such as size and BET surface area were investigated. The amount of filler and the pyrolysis temperature significantly affected the surface area and pore size. The surface area of PCS reached around 0.5 m 2 g by the pyrolysis at 800c C and pore also was found to almost disappear. In contrast, the specimen with filler showed high surface area above 200 m 2 g after the pyrolysis at 800c C and the retention of mesopore even after the pyrolysis at 1200c C.

Porous Nano-SiC as Thermal Insulator: Wisdom on Balancing Thermal Stability, High Strength and Low Thermal Conductivity

“…They attributed the well-developed sintering neck to the promotion of mass transfer by nano-powders. [17,18] On the other hand, high densities of stacking faults, interfaces and nano-pores [19,20] in nano-scale microstructures will enhance phonon scattering and reduce thermal conductivity. In this paper, thermal stability and properties of porous nano-SiC prepared from 600°C to 1,800°C are investigated.…”

Influence of uni and bi-modal SiC composition on mechanical properties and microstructure of reaction-bonded SiC ceramics

“…For the most part, the present samples have a full density of 3.003.05 g/cm 3 . This can demonstrate that controlled fine SiC grains for bi-modal SiC samples are crucial for obtaining improved mechanical properties.…”

“…The measured density of the green compacts is in the range of 1.621.90 g/cm 3 . The density of SC-F specimen showed relatively low value and its reason may be considered by agglomerates of fine SiC powders during compaction.…”

“…The density of SC-F specimen showed relatively low value and its reason may be considered by agglomerates of fine SiC powders during compaction. The bulk density and the porosity of the reactionbonded specimens are in the range of 3.003.05 g/cm 3 and of 0.30.4%, respectively. The present SiC specimens showed dense and higher values in comparison with 2.562.94 g/cm 3 , 8) and is similar with 2.813.07 g/cm 3 16) of already reported results.…”

Processing of polysiloxane-derived porous ceramics: a review

“…The pyrolysis temperature has significant effect on the shape and size of pores of the resultant ceramics [76][77][78][79]. It was demonstrated that the features of the produced ceramic foams were dependent on the composition and the structure of the pyrolyzed precursors.…”