Optimization of the ceramization process for the production of three-dimensional biomorphic porous SiC ceramics by chemical vapor infiltration (CVI)

Porous ceramics mimicking nature—preparation and properties of microstructures with unidirectionally oriented pores

“…A further reaction step is required to form pores after infiltration by route IV. Porous SiC [42] has been prepared by both routes III [42] and IV [43], while the latter route has also been used to prepare Si 3 N 4 /SiC [44] and Si/SiC/zeolite composites [45]. Route V, which involves infiltration of a pre-ceramic polymer in solution, pyrolysis at 800…”

Phase composition and morphology of TaC coating on carbon fibers by chemical vapor infiltration

“…To be vaporized easily and yielding high vapor pressure at low temperature, TaCl 5 powders (with a boiling temperature of 231.4°C at normal condition [16]) were used as precursor to provide the source of Ta. TaCl 5 powders were evaporated in a stainless steel evaporator (maintained at 180°C) and transported into the reactor by an Ar carrier gas stream, where the desired amount of TaCl 5 precursor can be dosed into the reactor by setting the calculated Ar carrier gas stream through the temperature controlled evaporator according to the ideal gas law [18].…”

Processing of biomorphic Si3N4 ceramics by CVI-R technique with SiCl4/H2/N2 system

“…By applying this schedule, the C b template shows a maximum carbon yield with 80% mass loss and reflects the microstructure and morphology of the initial paper preform. After the pyrolysis step, the resulting dimension of the produced C b template was (30 × 30 × 0.37 mm 3 ) with a geometrical density of 0.125 g/cm 3 . The obtained C b templates were then submitted to the infiltration step.…”