Microstructural and mechanical characteristics of SiC/SiC composites with modified-RS process

Effect of heat treatment on the tensile strength and creep resistance of advanced SiC fibers

“…These fibers experienced a pyrolysis/sintering process during fabrication and their microstructure and mechanical properties depend on the heat treatment temperature (HTT). On the other hand, the CMCs may be fabricated above the fiber's processing temperature [8,9], in which case, the performance of fibers could be changed by high temperature heat treatment. However, the effect of heat treatment effect on the fiber's properties in the CMCs requires further investigation to identify the factors which affect the high temperature properties of fiber.…”

High temperature characterization of reaction sintered SiC based materials

“…A large amount of Si rich SiC with a Si/C ratio of about 1.7 were created in the matrix of the RS-SiC f /SiC composite, compared to that of near stoichiometric SiC with a Si/C ratio of about 0.9. Such a chemical fluctuation in the SiC matrix is due to the presence of fine unreacted carbon and residual silicon phases [12]. Moreover, as shown in Fig.…”

“…The residual silicon content in the RS-SiC material can be decreased by the reduction of starting SiC particle sizes and the proportion of SiC and C particles in the preparation of C/SiC complex slurries [10,11]. Previous studies also showed that the slurry infiltration process by a combination of gas pressure impregnation and cold pressing was effective in making a sound fiber perform for high-density RS-SiC f /SiC composites [12,13]. However, in order to promote the applications of RS-SiC based materials, the mechanical property-microstructure correlation must be investigated at the elevated temperatures.…”

Microstructure, mechanical properties and reaction mechanism of KD-1 SiCf/SiC composites fabricated by chemical vapor infiltration and vapor silicon infiltration

“…However, CVI-and PIP-produced composites are inevitably porous, because the matrix densification stops when the surface pores are closed. In contrast to CVI and PIP process, RS has been demonstrated to be a cost-effective method, and has been recognized as an attractive technique because it can fabricate SiC f /SiC composites with high bulk density, good leak-tightness and high thermal conductivity [6]. In general, the RS process involves liquid silicon infiltration (LSI) and vapor silicon infiltration (VSI).…”