Structure and flexural properties of 3D needled carbon fiber reinforced carbon and silicon carbide (C/C-SiC) composites fabricated by gaseous and liquid silicon infiltration

Abstract

3D needled carbon fiber reinforced composites (C/C-SiC) were fabricated by gaseous silicon infiltration (GSI) for different reaction times, followed by further densification with liquid silicon infiltration (LSI). The density, flexural modulus and flexural strength increased as a spatially connected SiC structure developed, but the flexural strength could be degraded by a long total reaction time. The composites all exhibited quasi-brittle fracture with fiber bundle pull-out and interfacial debonding. Fracture could propagate within the needle bundles that were perpendicular to the tensile stress.

High-Temperature and High-Pressure Tribological Properties of Siliconized Graphite for Water-Lubricated Thrust Bearing Application in Main Coolant Pump

“…Figure 3 shows the XRD pattern of the siliconized graphite ring. Four main peaks of β-SiC at 2θ values of 35.6°, 41.3°, 59.9°, and 71.7° correspond to the diffraction peaks of the (111), ( 200), (220), and (311) crystalline planes of the face-centered cubic lattice [20], respectively. Three main peaks of graphite-2H at 26.4°, 44.3°, and 54.5° corresponding to the diffraction of the (002), (101), and (004) planes of the hexagonal close-packed lattice [21].…”

Properties and microstructure of Cf/HfC‐SiC composite prepared by combined process

“…However, the PIP process always means severe shrinkage of the matrix and the generation of a large number of pores. Reactive silicon infiltration, including liquid silicon infiltration and gaseous silicon infiltration (GSI), is an efficient and low‐cost fabrication process for the introduction of dense SiC matrix 22–24 . Gaseous silicon infiltration has the advantage of infiltrating smaller pores compared with molten silicon infiltration.…”

“…Reactive silicon infiltration, including liquid silicon infiltration and gaseous silicon infiltration (GSI), is an efficient and low-cost fabrication process for the introduction of dense SiC matrix. [22][23][24] Gaseous silicon infiltration has the advantage of infiltrating smaller pores compared with molten silicon infiltration. Moreover, it can be controlled to avoid reaction choking.…”

Effect of high temperature on mechanical properties and porosity of carbon fiber/epoxy composites

“…38 The damage development within composites cannot be accessed by surface observations. The application of high-resolution computed X-ray tomography (μXCT) allows new insights into damage development within composite microstructures, and when such in situ studies are coupled with digital volume correlation (DVC), 39 it is possible to quantify the deformation and strain states, [40][41][42][43] and their interactions with the architecture of the composite. 40 However, the mechanism of how the temperature affects the porosity variation and consequently how it affects the mechanical properties of carbon fiber/epoxy composite materials remain intricate.…”